1 | //#--------------------------------------------------------------------------- |
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2 | //# MBFITSreader.cc: ATNF single-dish RPFITS reader. |
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3 | //#--------------------------------------------------------------------------- |
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4 | //# Copyright (C) 2000-2008 |
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5 | //# Mark Calabretta, ATNF |
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6 | //# |
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7 | //# This library is free software; you can redistribute it and/or modify it |
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8 | //# under the terms of the GNU Library General Public License as published by |
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9 | //# the Free Software Foundation; either version 2 of the License, or (at your |
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10 | //# option) any later version. |
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11 | //# |
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12 | //# This library is distributed in the hope that it will be useful, but WITHOUT |
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13 | //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 | //# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public |
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15 | //# License for more details. |
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16 | //# |
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17 | //# You should have received a copy of the GNU Library General Public License |
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18 | //# along with this library; if not, write to the Free Software Foundation, |
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19 | //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA. |
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20 | //# |
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21 | //# Correspondence concerning this software should be addressed as follows: |
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22 | //# Internet email: mcalabre@atnf.csiro.au. |
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23 | //# Postal address: Dr. Mark Calabretta, |
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24 | //# Australia Telescope National Facility, |
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25 | //# P.O. Box 76, |
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26 | //# Epping, NSW, 2121, |
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27 | //# AUSTRALIA |
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28 | //# |
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29 | //# $Id: MBFITSreader.cc,v 19.54 2008-11-17 06:51:55 cal103 Exp $ |
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30 | //#--------------------------------------------------------------------------- |
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31 | //# The MBFITSreader class reads single dish RPFITS files (such as Parkes |
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32 | //# Multibeam MBFITS files). |
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33 | //# |
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34 | //# Original: 2000/07/28 Mark Calabretta |
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35 | //#--------------------------------------------------------------------------- |
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36 | |
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37 | #include <atnf/pks/pks_maths.h> |
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38 | #include <atnf/PKSIO/MBFITSreader.h> |
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39 | #include <atnf/PKSIO/MBrecord.h> |
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40 | |
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41 | #include <casa/math.h> |
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42 | #include <casa/iostream.h> |
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43 | #include <casa/stdio.h> |
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44 | #include <casa/stdlib.h> |
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45 | #include <casa/string.h> |
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46 | #include <unistd.h> |
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47 | |
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48 | #include <RPFITS.h> |
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49 | |
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50 | using namespace std; |
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51 | |
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52 | // Numerical constants. |
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53 | const double PI = 3.141592653589793238462643; |
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54 | const double TWOPI = 2.0 * PI; |
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55 | const double HALFPI = PI / 2.0; |
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56 | const double R2D = 180.0 / PI; |
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57 | |
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58 | //------------------------------------------------- MBFITSreader::MBFITSreader |
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59 | |
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60 | // Default constructor. |
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61 | |
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62 | MBFITSreader::MBFITSreader( |
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63 | const int retry, |
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64 | const int interpolate) |
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65 | { |
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66 | cRetry = retry; |
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67 | if (cRetry > 10) { |
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68 | cRetry = 10; |
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69 | } |
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70 | |
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71 | cInterp = interpolate; |
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72 | if (cInterp < 0 || cInterp > 2) { |
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73 | cInterp = 1; |
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74 | } |
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75 | |
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76 | // Initialize pointers. |
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77 | cBeams = 0x0; |
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78 | cIFs = 0x0; |
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79 | cNChan = 0x0; |
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80 | cNPol = 0x0; |
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81 | cHaveXPol = 0x0; |
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82 | cStartChan = 0x0; |
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83 | cEndChan = 0x0; |
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84 | cRefChan = 0x0; |
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85 | |
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86 | cVis = 0x0; |
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87 | cWgt = 0x0; |
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88 | |
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89 | cBeamSel = 0x0; |
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90 | cIFSel = 0x0; |
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91 | cChanOff = 0x0; |
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92 | cXpolOff = 0x0; |
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93 | cBuffer = 0x0; |
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94 | cPosUTC = 0x0; |
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95 | |
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96 | cMBopen = 0; |
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97 | |
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98 | // Tell RPFITSIN not to report errors directly. |
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99 | iostat_.errlun = -1; |
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100 | |
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101 | // By default, messages are written to stderr. |
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102 | initMsg(); |
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103 | } |
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104 | |
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105 | //------------------------------------------------ MBFITSreader::~MBFITSreader |
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106 | |
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107 | // Destructor. |
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108 | |
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109 | MBFITSreader::~MBFITSreader() |
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110 | { |
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111 | close(); |
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112 | } |
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113 | |
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114 | //--------------------------------------------------------- MBFITSreader::open |
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115 | |
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116 | // Open the RPFITS file for reading. |
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117 | |
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118 | int MBFITSreader::open( |
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119 | char *rpname, |
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120 | int &nBeam, |
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121 | int* &beams, |
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122 | int &nIF, |
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123 | int* &IFs, |
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124 | int* &nChan, |
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125 | int* &nPol, |
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126 | int* &haveXPol, |
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127 | int &haveBase, |
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128 | int &haveSpectra, |
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129 | int &extraSysCal) |
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130 | { |
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131 | // Clear the message stack. |
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132 | clearMsg(); |
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133 | |
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134 | if (cMBopen) { |
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135 | close(); |
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136 | } |
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137 | |
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138 | strcpy(names_.file, rpname); |
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139 | |
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140 | // Open the RPFITS file. |
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141 | int jstat = -3; |
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142 | if (rpfitsin(jstat)) { |
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143 | sprintf(cMsg, "ERROR: failed to open MBFITS file\n %s", rpname); |
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144 | logMsg(cMsg); |
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145 | return 1; |
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146 | } |
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147 | |
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148 | cMBopen = 1; |
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149 | |
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150 | // Tell RPFITSIN that we want the OBSTYPE card. |
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151 | int j; |
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152 | param_.ncard = 1; |
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153 | for (j = 0; j < 80; j++) { |
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154 | names_.card[j] = ' '; |
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155 | } |
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156 | strncpy(names_.card, "OBSTYPE", 7); |
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157 | |
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158 | // Read the first header. |
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159 | jstat = -1; |
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160 | if (rpfitsin(jstat)) { |
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161 | sprintf(cMsg, "ERROR: failed to read MBFITS header in file\n" |
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162 | " %s", rpname); |
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163 | logMsg(cMsg); |
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164 | close(); |
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165 | return 1; |
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166 | } |
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167 | |
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168 | // Mopra data has some peculiarities. |
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169 | cMopra = strncmp(names_.instrument, "ATMOPRA", 7) == 0; |
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170 | |
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171 | // Non-ATNF data may not store the position in (u,v,w). |
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172 | if (strncmp(names_.sta, "tid", 3) == 0) { |
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173 | sprintf(cMsg, "WARNING: Found Tidbinbilla data"); |
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174 | cSUpos = 1; |
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175 | } else if (strncmp(names_.sta, "HOB", 3) == 0) { |
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176 | sprintf(cMsg, "WARNING: Found Hobart data"); |
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177 | cSUpos = 1; |
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178 | } else if (strncmp(names_.sta, "CED", 3) == 0) { |
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179 | sprintf(cMsg, "WARNING: Found Ceduna data"); |
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180 | cSUpos = 1; |
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181 | } else { |
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182 | cSUpos = 0; |
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183 | } |
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184 | |
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185 | if (cSUpos) { |
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186 | strcat(cMsg, ", using telescope position\n from SU table."); |
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187 | logMsg(cMsg); |
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188 | cInterp = 0; |
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189 | } |
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190 | |
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191 | // Mean scan rate (for timestamp repairs). |
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192 | cNRate = 0; |
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193 | cAvRate[0] = 0.0; |
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194 | cAvRate[1] = 0.0; |
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195 | cCode5 = 0; |
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196 | |
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197 | |
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198 | // Find the maximum beam number. |
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199 | cNBeam = 0; |
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200 | for (int iBeam = 0; iBeam < anten_.nant; iBeam++) { |
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201 | if (anten_.ant_num[iBeam] > cNBeam) { |
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202 | cNBeam = anten_.ant_num[iBeam]; |
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203 | } |
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204 | } |
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205 | |
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206 | if (cNBeam <= 0) { |
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207 | logMsg("ERROR, couldn't determine number of beams."); |
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208 | close(); |
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209 | return 1; |
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210 | } |
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211 | |
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212 | // Construct the beam mask. |
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213 | cBeams = new int[cNBeam]; |
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214 | for (int iBeam = 0; iBeam < cNBeam; iBeam++) { |
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215 | cBeams[iBeam] = 0; |
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216 | } |
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217 | |
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218 | // ...beams present in the data. |
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219 | for (int iBeam = 0; iBeam < anten_.nant; iBeam++) { |
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220 | // Guard against dubious beam numbers, e.g. zeroes in |
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221 | // 1999-09-29_1632_024848p14_071b.hpf and the four scans following. |
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222 | // Note that the actual beam number is decoded from the 'baseline' random |
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223 | // parameter for each spectrum and is only used for beam selection. |
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224 | int beamNo = anten_.ant_num[iBeam]; |
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225 | if (beamNo != iBeam+1) { |
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226 | char sta[8]; |
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227 | strncpy(sta, names_.sta+(8*iBeam), 8); |
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228 | char *cp = sta + 7; |
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229 | while (*cp == ' ') *(cp--) = '\0'; |
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230 | |
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231 | sprintf(cMsg, |
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232 | "WARNING: RPFITSIN returned beam number %2d for AN table\n" |
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233 | " entry %2d with name '%.8s'", beamNo, iBeam+1, sta); |
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234 | |
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235 | char text[8]; |
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236 | sprintf(text, "MB%2.2d", iBeam+1); |
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237 | cp = cMsg + strlen(cMsg); |
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238 | if (strncmp(sta, text, 8) == 0) { |
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239 | beamNo = iBeam + 1; |
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240 | sprintf(cp, "; using beam number %2d.", beamNo); |
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241 | } else { |
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242 | sprintf(cp, "."); |
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243 | } |
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244 | |
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245 | logMsg(cMsg); |
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246 | } |
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247 | |
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248 | if (0 < beamNo && beamNo <= cNBeam) { |
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249 | cBeams[beamNo-1] = 1; |
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250 | } |
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251 | } |
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252 | |
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253 | // Passing back the address of the array allows PKSFITSreader::select() to |
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254 | // modify its elements directly. |
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255 | nBeam = cNBeam; |
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256 | beams = cBeams; |
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257 | |
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258 | |
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259 | // Number of IFs. |
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260 | cNIF = if_.n_if; |
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261 | cIFs = new int[cNIF]; |
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262 | for (int iIF = 0; iIF < cNIF; iIF++) { |
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263 | cIFs[iIF] = 1; |
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264 | } |
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265 | |
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266 | // Passing back the address of the array allows PKSFITSreader::select() to |
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267 | // modify its elements directly. |
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268 | nIF = cNIF; |
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269 | IFs = cIFs; |
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270 | |
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271 | |
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272 | // Number of channels and polarizations. |
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273 | cNChan = new int[cNIF]; |
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274 | cNPol = new int[cNIF]; |
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275 | cHaveXPol = new int[cNIF]; |
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276 | cGetXPol = 0; |
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277 | |
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278 | int maxProd = 0; |
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279 | for (int iIF = 0; iIF < cNIF; iIF++) { |
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280 | cNChan[iIF] = if_.if_nfreq[iIF]; |
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281 | cNPol[iIF] = if_.if_nstok[iIF]; |
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282 | cNChan[iIF] -= cNChan[iIF]%2; |
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283 | |
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284 | // Do we have cross-polarization data? |
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285 | if ((cHaveXPol[iIF] = cNPol[iIF] > 2)) { |
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286 | // Cross-polarization data is handled separately. |
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287 | cNPol[iIF] = 2; |
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288 | |
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289 | // Default is to get it if we have it. |
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290 | cGetXPol = 1; |
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291 | } |
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292 | |
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293 | // Maximum number of spectral products in any IF. |
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294 | int nProd = if_.if_nfreq[iIF] * if_.if_nstok[iIF]; |
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295 | if (maxProd < nProd) maxProd = nProd; |
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296 | } |
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297 | |
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298 | // Allocate memory for RPFITSIN subroutine arguments. |
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299 | if (cVis) delete [] cVis; |
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300 | if (cWgt) delete [] cWgt; |
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301 | cVis = new float[2*maxProd]; |
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302 | cWgt = new float[maxProd]; |
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303 | |
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304 | nChan = cNChan; |
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305 | nPol = cNPol; |
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306 | haveXPol = cHaveXPol; |
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307 | |
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308 | |
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309 | // Default channel range selection. |
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310 | cStartChan = new int[cNIF]; |
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311 | cEndChan = new int[cNIF]; |
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312 | cRefChan = new int[cNIF]; |
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313 | |
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314 | for (int iIF = 0; iIF < cNIF; iIF++) { |
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315 | cStartChan[iIF] = 1; |
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316 | cEndChan[iIF] = cNChan[iIF]; |
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317 | cRefChan[iIF] = cNChan[iIF]/2 + 1; |
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318 | } |
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319 | |
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320 | cGetSpectra = 1; |
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321 | |
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322 | |
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323 | // No baseline parameters in MBFITS. |
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324 | haveBase = 0; |
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325 | |
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326 | // Always have spectra in MBFITS. |
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327 | haveSpectra = cHaveSpectra = 1; |
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328 | |
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329 | |
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330 | // Integration cycle time (s). |
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331 | cIntTime = param_.intime; |
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332 | |
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333 | // Can't deduce binning mode till later. |
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334 | cNBin = 0; |
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335 | |
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336 | |
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337 | // Read the first syscal record. |
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338 | if (rpget(1, cEOS)) { |
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339 | logMsg("ERROR, failed to read first syscal record."); |
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340 | close(); |
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341 | return 1; |
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342 | } |
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343 | |
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344 | // Additional information for Parkes Multibeam data? |
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345 | extraSysCal = (sc_.sc_ant > anten_.nant); |
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346 | |
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347 | |
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348 | cFirst = 1; |
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349 | cEOF = 0; |
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350 | cFlushing = 0; |
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351 | |
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352 | return 0; |
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353 | } |
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354 | |
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355 | //---------------------------------------------------- MBFITSreader::getHeader |
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356 | |
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357 | // Get parameters describing the data. |
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358 | |
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359 | int MBFITSreader::getHeader( |
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360 | char observer[32], |
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361 | char project[32], |
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362 | char telescope[32], |
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363 | double antPos[3], |
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364 | char obsType[32], |
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365 | char bunit[32], |
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366 | float &equinox, |
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367 | char radecsys[32], |
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368 | char dopplerFrame[32], |
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369 | char datobs[32], |
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370 | double &utc, |
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371 | double &refFreq, |
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372 | double &bandwidth) |
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373 | { |
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374 | if (!cMBopen) { |
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375 | logMsg("ERROR, an MBFITS file has not been opened."); |
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376 | return 1; |
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377 | } |
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378 | |
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379 | sprintf(observer, "%-16.16s", names_.rp_observer); |
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380 | sprintf(project, "%-16.16s", names_.object); |
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381 | sprintf(telescope, "%-16.16s", names_.instrument); |
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382 | |
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383 | // Observatory coordinates (ITRF), in m. |
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384 | antPos[0] = doubles_.x[0]; |
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385 | antPos[1] = doubles_.y[0]; |
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386 | antPos[2] = doubles_.z[0]; |
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387 | |
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388 | // This is the only sure way to identify the telescope, maybe. |
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389 | if (strncmp(names_.sta, "MB0", 3) == 0) { |
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390 | // Parkes Multibeam. |
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391 | sprintf(telescope, "%-16.16s", "ATPKSMB"); |
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392 | antPos[0] = -4554232.087; |
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393 | antPos[1] = 2816759.046; |
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394 | antPos[2] = -3454035.950; |
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395 | |
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396 | } else if (strncmp(names_.sta, "HOH", 3) == 0) { |
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397 | // Parkes HOH receiver. |
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398 | sprintf(telescope, "%-16.16s", "ATPKSHOH"); |
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399 | antPos[0] = -4554232.087; |
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400 | antPos[1] = 2816759.046; |
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401 | antPos[2] = -3454035.950; |
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402 | |
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403 | } else if (strncmp(names_.sta, "CA0", 3) == 0) { |
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404 | // An ATCA antenna, use the array centre position. |
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405 | sprintf(telescope, "%-16.16s", "ATCA"); |
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406 | antPos[0] = -4750915.837; |
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407 | antPos[1] = 2792906.182; |
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408 | antPos[2] = -3200483.747; |
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409 | |
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410 | // ATCA-104. Updated position at epoch 2007/06/24 from Chris Phillips. |
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411 | // antPos[0] = -4751640.182; // ± 0.008 |
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412 | // antPos[1] = 2791700.322; // ± 0.006 |
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413 | // antPos[2] = -3200490.668; // ± 0.007 |
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414 | // |
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415 | } else if (strncmp(names_.sta, "MOP", 3) == 0) { |
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416 | // Mopra. Updated position at epoch 2007/06/24 from Chris Phillips. |
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417 | sprintf(telescope, "%-16.16s", "ATMOPRA"); |
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418 | antPos[0] = -4682769.444; // ± 0.009 |
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419 | antPos[1] = 2802618.963; // ± 0.006 |
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420 | antPos[2] = -3291758.864; // ± 0.008 |
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421 | |
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422 | } else if (strncmp(names_.sta, "HOB", 3) == 0) { |
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423 | // Hobart. |
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424 | sprintf(telescope, "%-16.16s", "HOBART"); |
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425 | antPos[0] = -3950236.735; |
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426 | antPos[1] = 2522347.567; |
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427 | antPos[2] = -4311562.569; |
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428 | |
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429 | } else if (strncmp(names_.sta, "CED", 3) == 0) { |
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430 | // Ceduna. Updated position at epoch 2007/06/24 from Chris Phillips. |
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431 | sprintf(telescope, "%-16.16s", "CEDUNA"); |
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432 | antPos[0] = -3753443.168; // ± 0.017 |
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433 | antPos[1] = 3912709.794; // ± 0.017 |
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434 | antPos[2] = -3348067.060; // ± 0.016 |
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435 | |
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436 | } else if (strncmp(names_.sta, "tid", 3) == 0) { |
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437 | // DSS. |
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438 | sprintf(telescope, "%-16.16s", "DSS-43"); |
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439 | antPos[0] = -4460894.727; |
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440 | antPos[1] = 2682361.530; |
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441 | antPos[2] = -3674748.424; |
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442 | } |
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443 | |
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444 | // Observation type. |
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445 | int j; |
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446 | for (j = 0; j < 31; j++) { |
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447 | obsType[j] = names_.card[11+j]; |
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448 | if (obsType[j] == '\'') break; |
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449 | } |
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450 | obsType[j] = '\0'; |
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451 | |
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452 | // Brightness unit. |
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453 | sprintf(bunit, "%-16.16s", names_.bunit); |
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454 | if (strcmp(bunit, "JY") == 0) { |
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455 | bunit[1] = 'y'; |
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456 | } else if (strcmp(bunit, "JY/BEAM") == 0) { |
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457 | strcpy(bunit, "Jy/beam"); |
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458 | } |
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459 | |
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460 | // Coordinate frames. |
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461 | equinox = 2000.0f; |
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462 | strcpy(radecsys, "FK5"); |
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463 | strcpy(dopplerFrame, "TOPOCENT"); |
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464 | |
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465 | // Time at start of observation. |
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466 | sprintf(datobs, "%-10.10s", names_.datobs); |
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467 | utc = cUTC; |
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468 | |
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469 | // Spectral parameters. |
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470 | refFreq = doubles_.if_freq[0]; |
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471 | bandwidth = doubles_.if_bw[0]; |
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472 | |
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473 | return 0; |
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474 | } |
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475 | |
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476 | //-------------------------------------------------- MBFITSreader::getFreqInfo |
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477 | |
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478 | // Get frequency parameters for each IF. |
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479 | |
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480 | int MBFITSreader::getFreqInfo( |
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481 | int &nIF, |
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482 | double* &startFreq, |
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483 | double* &endFreq) |
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484 | { |
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485 | // This is RPFITS - can't do it! |
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486 | return 1; |
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487 | } |
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488 | |
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489 | //---------------------------------------------------- MBFITSreader::findRange |
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490 | |
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491 | // Find the range of the data selected in time and position. |
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492 | |
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493 | int MBFITSreader::findRange( |
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494 | int &nRow, |
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495 | int &nSel, |
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496 | char dateSpan[2][32], |
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497 | double utcSpan[2], |
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498 | double* &positions) |
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499 | { |
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500 | // This is RPFITS - can't do it! |
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501 | return 1; |
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502 | } |
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503 | |
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504 | //--------------------------------------------------------- MBFITSreader::read |
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505 | |
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506 | // Read the next data record (if you're feeling lucky). |
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507 | |
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508 | int MBFITSreader::read( |
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509 | MBrecord &MBrec) |
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510 | { |
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511 | int beamNo = -1; |
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512 | int haveData, pCode = 0, status; |
---|
513 | double raRate = 0.0, decRate = 0.0, paRate = 0.0; |
---|
514 | MBrecord *iMBuff = 0x0; |
---|
515 | |
---|
516 | if (!cMBopen) { |
---|
517 | logMsg("ERROR, an MBFITS file has not been opened."); |
---|
518 | return 1; |
---|
519 | } |
---|
520 | |
---|
521 | // Positions recorded in the input records usually do not coincide with the |
---|
522 | // midpoint of the integration and hence the input must be buffered so that |
---|
523 | // true positions may be interpolated. |
---|
524 | // |
---|
525 | // On the first call nBeamSel buffers of length nBin, are allocated and |
---|
526 | // filled, where nBin is the number of time bins. |
---|
527 | // |
---|
528 | // The input records for binned, single beam data with multiple simultaneous |
---|
529 | // IFs are ordered by IF within each integration rather than by bin number |
---|
530 | // and hence are not in time order. No multibeam data exists with |
---|
531 | // nBin > 1 but the likelihood that the input records would be in beam/IF |
---|
532 | // order and the requirement that output records be in time order would |
---|
533 | // force an elaborate double-buffering system and we do not support it. |
---|
534 | // |
---|
535 | // Once all buffers are filled, the next record for each beam pertains to |
---|
536 | // the next integration and should contain new position information allowing |
---|
537 | // the proper position for each spectrum in the buffer to be interpolated. |
---|
538 | // The buffers are then flushed in time order. For single beam data there |
---|
539 | // is only one buffer and reads from the MBFITS file are suspended while the |
---|
540 | // flush is in progress. For multibeam data each buffer is of unit length |
---|
541 | // so the flush completes immediately and the new record takes its place. |
---|
542 | |
---|
543 | haveData = 0; |
---|
544 | while (!haveData) { |
---|
545 | int iBeamSel = -1, iIFSel = -1; |
---|
546 | |
---|
547 | if (!cFlushing) { |
---|
548 | if (cEOF) { |
---|
549 | return -1; |
---|
550 | } |
---|
551 | |
---|
552 | // Read the next record. |
---|
553 | pCode = 0; |
---|
554 | if ((status = rpget(0, cEOS)) == -1) { |
---|
555 | // EOF. |
---|
556 | cEOF = 1; |
---|
557 | cFlushing = 1; |
---|
558 | cFlushBin = 0; |
---|
559 | cFlushIF = 0; |
---|
560 | |
---|
561 | #ifdef PKSIO_DEBUG |
---|
562 | fprintf(stderr, "\nEnd-of-file detected, flushing last cycle.\n"); |
---|
563 | #endif |
---|
564 | |
---|
565 | } else if (status) { |
---|
566 | // IO error. |
---|
567 | return 1; |
---|
568 | |
---|
569 | } else { |
---|
570 | if (cFirst) { |
---|
571 | // First data; cBeamSel[] stores the buffer index for each beam. |
---|
572 | cNBeamSel = 0; |
---|
573 | cBeamSel = new int[cNBeam]; |
---|
574 | |
---|
575 | for (int iBeam = 0; iBeam < cNBeam; iBeam++) { |
---|
576 | if (cBeams[iBeam]) { |
---|
577 | // Buffer offset for this beam. |
---|
578 | cBeamSel[iBeam] = cNBeamSel++; |
---|
579 | } else { |
---|
580 | // Signal that the beam is not selected. |
---|
581 | cBeamSel[iBeam] = -1; |
---|
582 | } |
---|
583 | } |
---|
584 | |
---|
585 | // Set up bookkeeping arrays for IFs. |
---|
586 | cIFSel = new int[cNIF]; |
---|
587 | cChanOff = new int[cNIF]; |
---|
588 | cXpolOff = new int[cNIF]; |
---|
589 | |
---|
590 | int simulIF = 0; |
---|
591 | int maxChan = 0; |
---|
592 | int maxXpol = 0; |
---|
593 | |
---|
594 | for (int iIF = 0; iIF < cNIF; iIF++) { |
---|
595 | if (cIFs[iIF]) { |
---|
596 | // Buffer index for each IF within each simultaneous set. |
---|
597 | cIFSel[iIF] = 0; |
---|
598 | |
---|
599 | // Array offsets for each IF within each simultaneous set. |
---|
600 | cChanOff[iIF] = 0; |
---|
601 | cXpolOff[iIF] = 0; |
---|
602 | |
---|
603 | // Look for earlier IFs in the same simultaneous set. |
---|
604 | for (int jIF = 0; jIF < iIF; jIF++) { |
---|
605 | if (!cIFs[jIF]) continue; |
---|
606 | |
---|
607 | if (if_.if_simul[jIF] == if_.if_simul[iIF]) { |
---|
608 | // Got one, increment indices. |
---|
609 | cIFSel[iIF]++; |
---|
610 | |
---|
611 | cChanOff[iIF] += cNChan[jIF] * cNPol[jIF]; |
---|
612 | if (cHaveXPol[jIF]) { |
---|
613 | cXpolOff[iIF] += 2 * cNChan[jIF]; |
---|
614 | } |
---|
615 | } |
---|
616 | } |
---|
617 | |
---|
618 | // Maximum number of selected IFs in any simultaneous set. |
---|
619 | simulIF = max(simulIF, cIFSel[iIF]+1); |
---|
620 | |
---|
621 | // Maximum memory required for any simultaneous set. |
---|
622 | maxChan = max(maxChan, cChanOff[iIF] + cNChan[iIF]*cNPol[iIF]); |
---|
623 | if (cHaveXPol[iIF]) { |
---|
624 | maxXpol = max(maxXpol, cXpolOff[iIF] + 2*cNChan[iIF]); |
---|
625 | } |
---|
626 | |
---|
627 | } else { |
---|
628 | // Signal that the IF is not selected. |
---|
629 | cIFSel[iIF] = -1; |
---|
630 | } |
---|
631 | } |
---|
632 | |
---|
633 | // Check for binning mode observations. |
---|
634 | if (param_.intbase > 0.0f) { |
---|
635 | cNBin = int((cIntTime / param_.intbase) + 0.5); |
---|
636 | |
---|
637 | // intbase sometimes contains rubbish. |
---|
638 | if (cNBin == 0) { |
---|
639 | cNBin = 1; |
---|
640 | } |
---|
641 | } else { |
---|
642 | cNBin = 1; |
---|
643 | } |
---|
644 | |
---|
645 | if (cNBin > 1 && cNBeamSel > 1) { |
---|
646 | logMsg("ERROR, cannot handle binning mode for multiple beams."); |
---|
647 | close(); |
---|
648 | return 1; |
---|
649 | } |
---|
650 | |
---|
651 | // Allocate buffer data storage; the MBrecord constructor zeroes |
---|
652 | // class members such as cycleNo that are tested in the first pass |
---|
653 | // below. |
---|
654 | int nBuff = cNBeamSel * cNBin; |
---|
655 | cBuffer = new MBrecord[nBuff]; |
---|
656 | |
---|
657 | // Allocate memory for spectral arrays. |
---|
658 | for (int ibuff = 0; ibuff < nBuff; ibuff++) { |
---|
659 | cBuffer[ibuff].setNIFs(simulIF); |
---|
660 | cBuffer[ibuff].allocate(0, maxChan, maxXpol); |
---|
661 | |
---|
662 | // Signal that this IF in this buffer has been flushed. |
---|
663 | for (int iIF = 0; iIF < simulIF; iIF++) { |
---|
664 | cBuffer[ibuff].IFno[iIF] = 0; |
---|
665 | } |
---|
666 | } |
---|
667 | |
---|
668 | cPosUTC = new double[cNBeamSel]; |
---|
669 | |
---|
670 | cFirst = 0; |
---|
671 | cScanNo = 1; |
---|
672 | cCycleNo = 0; |
---|
673 | cPrevUTC = -1.0; |
---|
674 | } |
---|
675 | |
---|
676 | // Check for end-of-scan. |
---|
677 | if (cEOS) { |
---|
678 | cScanNo++; |
---|
679 | cCycleNo = 0; |
---|
680 | cPrevUTC = -1.0; |
---|
681 | } |
---|
682 | |
---|
683 | // Check for change-of-day. |
---|
684 | double cod = 0.0; |
---|
685 | if ((cUTC + 86400.0) < (cPrevUTC + 600.0)) { |
---|
686 | // cUTC should continue to increase past 86400 during a single scan. |
---|
687 | // However, if the RPFITS file contains multiple scans that straddle |
---|
688 | // midnight then cUTC can jump backwards from the end of one scan to |
---|
689 | // the start of the next. |
---|
690 | #ifdef PKSIO_DEBUG |
---|
691 | fprintf(stderr, "Change-of-day on cUTC: %.1f -> %.1f", |
---|
692 | cPrevUTC, cUTC); |
---|
693 | #endif |
---|
694 | // Can't change the recorded value of cUTC directly (without also |
---|
695 | // changing dateobs) so change-of-day must be recorded separately as |
---|
696 | // an offset to be applied when comparing integration timestamps. |
---|
697 | cod = 86400.0; |
---|
698 | |
---|
699 | } else if (cUTC < cPrevUTC - 1.0) { |
---|
700 | sprintf(cMsg, |
---|
701 | "WARNING: Cycle %d:%03d-%03d, UTC went backwards from\n" |
---|
702 | " %.1f to %.1f! Incrementing day number,\n" |
---|
703 | " positions may be unreliable.", cScanNo, cCycleNo, |
---|
704 | cCycleNo+1, cPrevUTC, cUTC); |
---|
705 | logMsg(cMsg); |
---|
706 | cUTC += 86400.0; |
---|
707 | } |
---|
708 | |
---|
709 | if (cNBin > 1) { |
---|
710 | // Binning mode: correct the time. |
---|
711 | cUTC += param_.intbase * (cBin - (cNBin + 1)/2.0); |
---|
712 | } |
---|
713 | |
---|
714 | // New integration cycle? |
---|
715 | if ((cUTC+cod) > cPrevUTC) { |
---|
716 | cCycleNo++; |
---|
717 | cPrevUTC = cUTC + 0.0001; |
---|
718 | } |
---|
719 | |
---|
720 | // Apply beam selection. |
---|
721 | beamNo = int(cBaseline / 256.0); |
---|
722 | if (beamNo == 1) { |
---|
723 | // Store the position of beam 1 for grid convergence corrections. |
---|
724 | cRA0 = cU; |
---|
725 | cDec0 = cV; |
---|
726 | } |
---|
727 | iBeamSel = cBeamSel[beamNo-1]; |
---|
728 | if (iBeamSel < 0) continue; |
---|
729 | |
---|
730 | // Sanity check (mainly for MOPS). |
---|
731 | if (cIFno > cNIF) continue; |
---|
732 | |
---|
733 | // Apply IF selection. |
---|
734 | iIFSel = cIFSel[cIFno - 1]; |
---|
735 | if (iIFSel < 0) continue; |
---|
736 | |
---|
737 | sprintf(cDateObs, "%-10.10s", names_.datobs); |
---|
738 | cDateObs[10] = '\0'; |
---|
739 | |
---|
740 | // Compute buffer number. |
---|
741 | iMBuff = cBuffer + iBeamSel; |
---|
742 | if (cNBin > 1) iMBuff += cNBeamSel*(cBin-1); |
---|
743 | |
---|
744 | if (cCycleNo < iMBuff->cycleNo) { |
---|
745 | // Note that if the first beam and IF are not both selected cEOS |
---|
746 | // will be cleared by rpget() when the next beam/IF is read. |
---|
747 | cEOS = 1; |
---|
748 | } |
---|
749 | |
---|
750 | // Begin flush cycle? |
---|
751 | if (cEOS || (iMBuff->nIF && (cUTC+cod) > (iMBuff->utc+0.0001))) { |
---|
752 | cFlushing = 1; |
---|
753 | cFlushBin = 0; |
---|
754 | cFlushIF = 0; |
---|
755 | } |
---|
756 | |
---|
757 | #ifdef PKSIO_DEBUG |
---|
758 | char rel = '='; |
---|
759 | double dt = utcDiff(cUTC, cW); |
---|
760 | if (dt < 0.0) { |
---|
761 | rel = '<'; |
---|
762 | } else if (dt > 0.0) { |
---|
763 | rel = '>'; |
---|
764 | } |
---|
765 | |
---|
766 | fprintf(stderr, "\n In:%4d%4d%3d%3d %.3f %c %.3f (%+.3fs) - " |
---|
767 | "%sflushing\n", cScanNo, cCycleNo, beamNo, cIFno, cUTC, rel, cW, dt, |
---|
768 | cFlushing ? "" : "not "); |
---|
769 | if (cEOS) { |
---|
770 | fprintf(stderr, "Start of new scan, flushing previous scan.\n"); |
---|
771 | } |
---|
772 | #endif |
---|
773 | } |
---|
774 | } |
---|
775 | |
---|
776 | |
---|
777 | if (cFlushing) { |
---|
778 | // Find the oldest integration to flush, noting that the last |
---|
779 | // integration cycle may be incomplete. |
---|
780 | beamNo = 0; |
---|
781 | int cycleNo = 0; |
---|
782 | for (; cFlushBin < cNBin; cFlushBin++) { |
---|
783 | for (iBeamSel = 0; iBeamSel < cNBeamSel; iBeamSel++) { |
---|
784 | iMBuff = cBuffer + iBeamSel + cNBeamSel*cFlushBin; |
---|
785 | |
---|
786 | // iMBuff->nIF is set to zero (below) to signal that all IFs in |
---|
787 | // an integration have been flushed. |
---|
788 | if (iMBuff->nIF) { |
---|
789 | if (cycleNo == 0 || iMBuff->cycleNo < cycleNo) { |
---|
790 | beamNo = iMBuff->beamNo; |
---|
791 | cycleNo = iMBuff->cycleNo; |
---|
792 | } |
---|
793 | } |
---|
794 | } |
---|
795 | |
---|
796 | if (beamNo) { |
---|
797 | // Found an integration to flush. |
---|
798 | break; |
---|
799 | } |
---|
800 | } |
---|
801 | |
---|
802 | if (beamNo) { |
---|
803 | iBeamSel = cBeamSel[beamNo-1]; |
---|
804 | iMBuff = cBuffer + iBeamSel + cNBeamSel*cFlushBin; |
---|
805 | |
---|
806 | // Find the IF to flush. |
---|
807 | for (; cFlushIF < iMBuff->nIF; cFlushIF++) { |
---|
808 | if (iMBuff->IFno[cFlushIF]) break; |
---|
809 | } |
---|
810 | |
---|
811 | } else { |
---|
812 | // Flush complete. |
---|
813 | cFlushing = 0; |
---|
814 | if (cEOF) { |
---|
815 | return -1; |
---|
816 | } |
---|
817 | |
---|
818 | // The last record read must have been the first of a new cycle. |
---|
819 | beamNo = int(cBaseline / 256.0); |
---|
820 | iBeamSel = cBeamSel[beamNo-1]; |
---|
821 | |
---|
822 | // Compute buffer number. |
---|
823 | iMBuff = cBuffer + iBeamSel; |
---|
824 | if (cNBin > 1) iMBuff += cNBeamSel*(cBin-1); |
---|
825 | } |
---|
826 | } |
---|
827 | |
---|
828 | |
---|
829 | if (cFlushing && cFlushBin == 0 && cFlushIF == 0 && cInterp) { |
---|
830 | // Start of flush cycle, interpolate the beam position. |
---|
831 | // |
---|
832 | // The position is measured by the control system at a time returned by |
---|
833 | // RPFITSIN as the 'w' visibility coordinate. The ra and dec, returned |
---|
834 | // as the 'u' and 'v' visibility coordinates, must be interpolated to |
---|
835 | // the integration time which RPFITSIN returns as 'cUTC', this usually |
---|
836 | // being a second or two later. The interpolation method used here is |
---|
837 | // based on the scan rate. |
---|
838 | // |
---|
839 | // "This" RA, Dec, and UTC refers to the position currently stored in |
---|
840 | // the buffer marked for output (iMBuff). This position is interpolated |
---|
841 | // to the midpoint of that integration using either |
---|
842 | // a) the rate currently sitting in iMBuff, which was computed from |
---|
843 | // the previous integration, otherwise |
---|
844 | // b) from the position recorded in the "next" integration which is |
---|
845 | // currently sitting in the RPFITS commons, |
---|
846 | // so that the position timestamps straddle the midpoint of the |
---|
847 | // integration and is thereby interpolated rather than extrapolated. |
---|
848 | // |
---|
849 | // At the end of a scan, or if the next position has not been updated |
---|
850 | // or its timestamp does not advance sufficiently, the most recent |
---|
851 | // determination of the scan rate will be used for extrapolation which |
---|
852 | // is quantified by the "rate age" measured in seconds beyond the |
---|
853 | // interval defined by the position timestamps. |
---|
854 | |
---|
855 | // At this point, iMBuff contains cU, cV, cW, parAngle and focusRot |
---|
856 | // stored from the previous call to rpget() for this beam (i.e. "this"), |
---|
857 | // and also raRate, decRate and paRate computed from that integration |
---|
858 | // and the previous one. |
---|
859 | double thisRA = iMBuff->ra; |
---|
860 | double thisDec = iMBuff->dec; |
---|
861 | double thisUTC = cPosUTC[iBeamSel]; |
---|
862 | double thisPA = iMBuff->parAngle + iMBuff->focusRot; |
---|
863 | |
---|
864 | #ifdef PKSIO_DEBUG |
---|
865 | fprintf(stderr, "This (%d) ra, dec, UTC: %9.4f %9.4f %10.3f %9.4f\n", |
---|
866 | iMBuff->cycleNo, thisRA*R2D, thisDec*R2D, thisUTC, thisPA*R2D); |
---|
867 | #endif |
---|
868 | |
---|
869 | if (cEOF || cEOS) { |
---|
870 | // Use rates from the last cycle. |
---|
871 | raRate = iMBuff->raRate; |
---|
872 | decRate = iMBuff->decRate; |
---|
873 | paRate = iMBuff->paRate; |
---|
874 | |
---|
875 | } else { |
---|
876 | if (cW == thisUTC) { |
---|
877 | // The control system at Mopra typically does not update the |
---|
878 | // positions between successive integration cycles at the end of a |
---|
879 | // scan (nor are they flagged). In this case we use the previously |
---|
880 | // computed rates, even if from the previous scan since these are |
---|
881 | // likely to be a better guess than anything else. |
---|
882 | raRate = iMBuff->raRate; |
---|
883 | decRate = iMBuff->decRate; |
---|
884 | paRate = iMBuff->paRate; |
---|
885 | |
---|
886 | if (cU == thisRA && cV == thisDec) { |
---|
887 | // Position and timestamp unchanged. |
---|
888 | pCode = 1; |
---|
889 | |
---|
890 | } else if (fabs(cU-thisRA) < 0.0001 && fabs(cV-thisDec) < 0.0001) { |
---|
891 | // Allow small rounding errors (seen infrequently). |
---|
892 | pCode = 1; |
---|
893 | |
---|
894 | } else { |
---|
895 | // (cU,cV) are probably rubbish (not yet seen in practice). |
---|
896 | pCode = 2; |
---|
897 | cU = thisRA; |
---|
898 | cV = thisDec; |
---|
899 | } |
---|
900 | |
---|
901 | #ifdef PKSIO_DEBUG |
---|
902 | fprintf(stderr, "Next (%d) ra, dec, UTC: %9.4f %9.4f %10.3f " |
---|
903 | "(0.000s)\n", cCycleNo, cU*R2D, cV*R2D, cW); |
---|
904 | #endif |
---|
905 | |
---|
906 | } else { |
---|
907 | double nextRA = cU; |
---|
908 | double nextDec = cV; |
---|
909 | |
---|
910 | // Check and, if necessary, repair the position timestamp, |
---|
911 | // remembering that pCode refers to the NEXT cycle. |
---|
912 | pCode = fixw(cDateObs, cCycleNo, beamNo, cAvRate, thisRA, thisDec, |
---|
913 | thisUTC, nextRA, nextDec, cW); |
---|
914 | if (pCode > 0) pCode += 3; |
---|
915 | double nextUTC = cW; |
---|
916 | |
---|
917 | #ifdef PKSIO_DEBUG |
---|
918 | fprintf(stderr, "Next (%d) ra, dec, UTC: %9.4f %9.4f %10.3f " |
---|
919 | "(%+.3fs)\n", cCycleNo, nextRA*R2D, nextDec*R2D, nextUTC, |
---|
920 | utcDiff(nextUTC, thisUTC)); |
---|
921 | #endif |
---|
922 | |
---|
923 | // Compute the scan rate for this beam. |
---|
924 | double dUTC = utcDiff(nextUTC, thisUTC); |
---|
925 | if ((0.0 < dUTC) && (dUTC < 600.0)) { |
---|
926 | scanRate(cRA0, cDec0, thisRA, thisDec, nextRA, nextDec, dUTC, |
---|
927 | raRate, decRate); |
---|
928 | |
---|
929 | // Update the mean scan rate. |
---|
930 | cAvRate[0] = (cAvRate[0]*cNRate + raRate) / (cNRate + 1); |
---|
931 | cAvRate[1] = (cAvRate[1]*cNRate + decRate) / (cNRate + 1); |
---|
932 | cNRate++; |
---|
933 | |
---|
934 | // Rate of change of position angle. |
---|
935 | if (sc_.sc_ant <= anten_.nant) { |
---|
936 | paRate = 0.0; |
---|
937 | } else { |
---|
938 | int iOff = sc_.sc_q * (sc_.sc_ant - 1) - 1; |
---|
939 | double nextPA = sc_.sc_cal[iOff + 4] + sc_.sc_cal[iOff + 7]; |
---|
940 | double paDiff = nextPA - thisPA; |
---|
941 | if (paDiff > PI) { |
---|
942 | paDiff -= TWOPI; |
---|
943 | } else if (paDiff < -PI) { |
---|
944 | paDiff += TWOPI; |
---|
945 | } |
---|
946 | paRate = paDiff / dUTC; |
---|
947 | } |
---|
948 | |
---|
949 | if (cInterp == 2) { |
---|
950 | // Use the same interpolation scheme as the original pksmbfits |
---|
951 | // client. This incorrectly assumed that (nextUTC - thisUTC) is |
---|
952 | // equal to the integration time and interpolated by computing a |
---|
953 | // weighted sum of the positions before and after the required |
---|
954 | // time. |
---|
955 | |
---|
956 | double utc = iMBuff->utc; |
---|
957 | double tw1 = 1.0 - utcDiff(utc, thisUTC) / iMBuff->exposure; |
---|
958 | double tw2 = 1.0 - utcDiff(nextUTC, utc) / iMBuff->exposure; |
---|
959 | double gamma = (tw2 / (tw1 + tw2)) * dUTC / (utc - thisUTC); |
---|
960 | |
---|
961 | // Guard against RA cycling through 24h in either direction. |
---|
962 | if (fabs(nextRA - thisRA) > PI) { |
---|
963 | if (nextRA < thisRA) { |
---|
964 | nextRA += TWOPI; |
---|
965 | } else { |
---|
966 | nextRA -= TWOPI; |
---|
967 | } |
---|
968 | } |
---|
969 | |
---|
970 | raRate = gamma * (nextRA - thisRA) / dUTC; |
---|
971 | decRate = gamma * (nextDec - thisDec) / dUTC; |
---|
972 | } |
---|
973 | |
---|
974 | } else { |
---|
975 | if (cCycleNo == 2 && fabs(utcDiff(cUTC,cW)) < 600.0) { |
---|
976 | // thisUTC (i.e. cW for the first cycle) is rubbish, and |
---|
977 | // probably the position as well (extremely rare in practice, |
---|
978 | // e.g. 97-12-19_1029_235708-18_586e.hpf which actually has the |
---|
979 | // t/1000 scaling bug in the first cycle). |
---|
980 | iMBuff->pCode = 3; |
---|
981 | thisRA = cU; |
---|
982 | thisDec = cV; |
---|
983 | thisUTC = cW; |
---|
984 | raRate = 0.0; |
---|
985 | decRate = 0.0; |
---|
986 | paRate = 0.0; |
---|
987 | |
---|
988 | } else { |
---|
989 | // cW is rubbish and probably (cU,cV), and possibly the |
---|
990 | // parallactic angle and everything else as well (rarely seen |
---|
991 | // in practice, e.g. 97-12-09_0743_235707-58_327c.hpf and |
---|
992 | // 97-09-01_0034_123717-42_242b.hpf, the latter with bad |
---|
993 | // parallactic angle). |
---|
994 | pCode = 3; |
---|
995 | cU = thisRA; |
---|
996 | cV = thisDec; |
---|
997 | cW = thisUTC; |
---|
998 | raRate = iMBuff->raRate; |
---|
999 | decRate = iMBuff->decRate; |
---|
1000 | paRate = iMBuff->paRate; |
---|
1001 | } |
---|
1002 | } |
---|
1003 | } |
---|
1004 | } |
---|
1005 | |
---|
1006 | |
---|
1007 | // Choose the closest rate determination. |
---|
1008 | if (cCycleNo == 1) { |
---|
1009 | // Scan containing a single integration. |
---|
1010 | iMBuff->raRate = 0.0; |
---|
1011 | iMBuff->decRate = 0.0; |
---|
1012 | iMBuff->paRate = 0.0; |
---|
1013 | |
---|
1014 | } else { |
---|
1015 | double dUTC = iMBuff->utc - cPosUTC[iBeamSel]; |
---|
1016 | |
---|
1017 | if (dUTC >= 0.0) { |
---|
1018 | // In HIPASS/ZOA, the position timestamp, which should always occur |
---|
1019 | // on the whole second, normally precedes an integration midpoint |
---|
1020 | // falling on the half-second. Consequently, positive ages are |
---|
1021 | // always half-integral. |
---|
1022 | dUTC = utcDiff(iMBuff->utc, cW); |
---|
1023 | if (dUTC > 0.0) { |
---|
1024 | iMBuff->rateAge = dUTC; |
---|
1025 | } else { |
---|
1026 | iMBuff->rateAge = 0.0f; |
---|
1027 | } |
---|
1028 | |
---|
1029 | iMBuff->raRate = raRate; |
---|
1030 | iMBuff->decRate = decRate; |
---|
1031 | iMBuff->paRate = paRate; |
---|
1032 | |
---|
1033 | } else { |
---|
1034 | // In HIPASS/ZOA, negative ages occur when the integration midpoint, |
---|
1035 | // occurring on the whole second, precedes the position timestamp. |
---|
1036 | // Thus negative ages are always an integral number of seconds. |
---|
1037 | // They have only been seen to occur sporadically in the period |
---|
1038 | // 1999/05/31 to 1999/11/01, e.g. 1999-07-26_1821_005410-74_007c.hpf |
---|
1039 | // |
---|
1040 | // In recent (2008/10/07) Mopra data, small negative ages (~10ms, |
---|
1041 | // occasionally up to ~300ms) seem to be the norm, with both the |
---|
1042 | // position timestamp and integration midpoint falling close to but |
---|
1043 | // not on the integral second. |
---|
1044 | if (cCycleNo == 2) { |
---|
1045 | // We have to start with something! |
---|
1046 | iMBuff->rateAge = dUTC; |
---|
1047 | |
---|
1048 | } else { |
---|
1049 | // Although we did not record the relevant position timestamp |
---|
1050 | // explicitly, it can easily be deduced. |
---|
1051 | double w = iMBuff->utc - utcDiff(cUTC, iMBuff->utc) - |
---|
1052 | iMBuff->rateAge; |
---|
1053 | dUTC = utcDiff(iMBuff->utc, w); |
---|
1054 | |
---|
1055 | if (dUTC > 0.0) { |
---|
1056 | iMBuff->rateAge = 0.0f; |
---|
1057 | } else { |
---|
1058 | iMBuff->rateAge = dUTC; |
---|
1059 | } |
---|
1060 | } |
---|
1061 | |
---|
1062 | iMBuff->raRate = raRate; |
---|
1063 | iMBuff->decRate = decRate; |
---|
1064 | iMBuff->paRate = paRate; |
---|
1065 | } |
---|
1066 | } |
---|
1067 | |
---|
1068 | #ifdef PKSIO_DEBUG |
---|
1069 | double avRate = sqrt(cAvRate[0]*cAvRate[0] + cAvRate[1]*cAvRate[1]); |
---|
1070 | fprintf(stderr, "RA, Dec, Av & PA rates: %8.4f %8.4f %8.4f %8.4f " |
---|
1071 | "pCode %d\n", raRate*R2D, decRate*R2D, avRate*R2D, paRate*R2D, pCode); |
---|
1072 | #endif |
---|
1073 | |
---|
1074 | |
---|
1075 | // Compute the position of this beam for all bins. |
---|
1076 | for (int idx = 0; idx < cNBin; idx++) { |
---|
1077 | int jbuff = iBeamSel + cNBeamSel*idx; |
---|
1078 | |
---|
1079 | cBuffer[jbuff].raRate = iMBuff->raRate; |
---|
1080 | cBuffer[jbuff].decRate = iMBuff->decRate; |
---|
1081 | cBuffer[jbuff].paRate = iMBuff->paRate; |
---|
1082 | |
---|
1083 | double dUTC = utcDiff(cBuffer[jbuff].utc, thisUTC); |
---|
1084 | if (dUTC > 100.0) { |
---|
1085 | // Must have cycled through midnight. |
---|
1086 | dUTC -= 86400.0; |
---|
1087 | } |
---|
1088 | |
---|
1089 | applyRate(cRA0, cDec0, thisRA, thisDec, |
---|
1090 | cBuffer[jbuff].raRate, cBuffer[jbuff].decRate, dUTC, |
---|
1091 | cBuffer[jbuff].ra, cBuffer[jbuff].dec); |
---|
1092 | |
---|
1093 | #ifdef PKSIO_DEBUG |
---|
1094 | fprintf(stderr, "Intp (%d) ra, dec, UTC: %9.4f %9.4f %10.3f (pCode, " |
---|
1095 | "age: %d %.1fs)\n", iMBuff->cycleNo, cBuffer[jbuff].ra*R2D, |
---|
1096 | cBuffer[jbuff].dec*R2D, cBuffer[jbuff].utc, iMBuff->pCode, |
---|
1097 | iMBuff->rateAge); |
---|
1098 | #endif |
---|
1099 | } |
---|
1100 | } |
---|
1101 | |
---|
1102 | |
---|
1103 | if (cFlushing) { |
---|
1104 | // Copy buffer location out one IF at a time. |
---|
1105 | MBrec.extract(*iMBuff, cFlushIF); |
---|
1106 | haveData = 1; |
---|
1107 | |
---|
1108 | #ifdef PKSIO_DEBUG |
---|
1109 | fprintf(stderr, "Out:%4d%4d%3d%3d\n", MBrec.scanNo, MBrec.cycleNo, |
---|
1110 | MBrec.beamNo, MBrec.IFno[0]); |
---|
1111 | #endif |
---|
1112 | |
---|
1113 | // Signal that this IF in this buffer location has been flushed. |
---|
1114 | iMBuff->IFno[cFlushIF] = 0; |
---|
1115 | |
---|
1116 | if (cFlushIF == iMBuff->nIF - 1) { |
---|
1117 | // Signal that all IFs in this buffer location have been flushed. |
---|
1118 | iMBuff->nIF = 0; |
---|
1119 | |
---|
1120 | // Stop cEOS being set when the next integration is read. |
---|
1121 | iMBuff->cycleNo = 0; |
---|
1122 | |
---|
1123 | } else { |
---|
1124 | // Carry on flushing the other IFs. |
---|
1125 | continue; |
---|
1126 | } |
---|
1127 | |
---|
1128 | // Has the whole buffer been flushed? |
---|
1129 | if (cFlushBin == cNBin - 1) { |
---|
1130 | if (cEOS || cEOF) { |
---|
1131 | // Carry on flushing other buffers. |
---|
1132 | cFlushIF = 0; |
---|
1133 | continue; |
---|
1134 | } |
---|
1135 | |
---|
1136 | cFlushing = 0; |
---|
1137 | |
---|
1138 | beamNo = int(cBaseline / 256.0); |
---|
1139 | iBeamSel = cBeamSel[beamNo-1]; |
---|
1140 | |
---|
1141 | // Compute buffer number. |
---|
1142 | iMBuff = cBuffer + iBeamSel; |
---|
1143 | if (cNBin > 1) iMBuff += cNBeamSel*(cBin-1); |
---|
1144 | } |
---|
1145 | } |
---|
1146 | |
---|
1147 | if (!cFlushing) { |
---|
1148 | // Buffer this MBrec. |
---|
1149 | if ((cScanNo > iMBuff->scanNo) && iMBuff->IFno[0]) { |
---|
1150 | // Sanity check on the number of IFs in the new scan. |
---|
1151 | if (if_.n_if != cNIF) { |
---|
1152 | sprintf(cMsg, "WARNING: Scan %d has %d IFs instead of %d, " |
---|
1153 | "continuing.", cScanNo, if_.n_if, cNIF); |
---|
1154 | logMsg(cMsg); |
---|
1155 | } |
---|
1156 | } |
---|
1157 | |
---|
1158 | // Sanity check on incomplete integrations within a scan. |
---|
1159 | if (iMBuff->nIF && (iMBuff->cycleNo != cCycleNo)) { |
---|
1160 | // Force the incomplete integration to be flushed before proceeding. |
---|
1161 | cFlushing = 1; |
---|
1162 | continue; |
---|
1163 | } |
---|
1164 | |
---|
1165 | #ifdef PKSIO_DEBUG |
---|
1166 | fprintf(stderr, "Buf:%4d%4d%3d%3d\n", cScanNo, cCycleNo, beamNo, cIFno); |
---|
1167 | #endif |
---|
1168 | |
---|
1169 | // Store IF-independent parameters only for the first IF of a new cycle, |
---|
1170 | // particularly because this is the only one for which the scan rates |
---|
1171 | // are computed above. |
---|
1172 | int firstIF = (iMBuff->nIF == 0); |
---|
1173 | if (firstIF) { |
---|
1174 | iMBuff->scanNo = cScanNo; |
---|
1175 | iMBuff->cycleNo = cCycleNo; |
---|
1176 | |
---|
1177 | // Times. |
---|
1178 | strcpy(iMBuff->datobs, cDateObs); |
---|
1179 | iMBuff->utc = cUTC; |
---|
1180 | iMBuff->exposure = param_.intbase; |
---|
1181 | |
---|
1182 | // Source identification. |
---|
1183 | sprintf(iMBuff->srcName, "%-16.16s", |
---|
1184 | names_.su_name + (cSrcNo-1)*16); |
---|
1185 | iMBuff->srcName[16] = '\0'; |
---|
1186 | iMBuff->srcRA = doubles_.su_ra[cSrcNo-1]; |
---|
1187 | iMBuff->srcDec = doubles_.su_dec[cSrcNo-1]; |
---|
1188 | |
---|
1189 | // Rest frequency of the line of interest. |
---|
1190 | iMBuff->restFreq = doubles_.rfreq; |
---|
1191 | if (strncmp(names_.instrument, "ATPKSMB", 7) == 0) { |
---|
1192 | // Fix the HI rest frequency recorded for Parkes multibeam data. |
---|
1193 | double reffreq = doubles_.freq; |
---|
1194 | double restfreq = doubles_.rfreq; |
---|
1195 | if ((restfreq == 0.0 || fabs(restfreq - reffreq) == 0.0) && |
---|
1196 | fabs(reffreq - 1420.405752e6) < 100.0) { |
---|
1197 | iMBuff->restFreq = 1420.405752e6; |
---|
1198 | } |
---|
1199 | } |
---|
1200 | |
---|
1201 | // Observation type. |
---|
1202 | int j; |
---|
1203 | for (j = 0; j < 15; j++) { |
---|
1204 | iMBuff->obsType[j] = names_.card[11+j]; |
---|
1205 | if (iMBuff->obsType[j] == '\'') break; |
---|
1206 | } |
---|
1207 | iMBuff->obsType[j] = '\0'; |
---|
1208 | |
---|
1209 | // Beam-dependent parameters. |
---|
1210 | iMBuff->beamNo = beamNo; |
---|
1211 | |
---|
1212 | // Beam position at the specified time. |
---|
1213 | if (cSUpos) { |
---|
1214 | // Non-ATNF data that does not store the position in (u,v,w). |
---|
1215 | iMBuff->ra = doubles_.su_ra[cSrcNo-1]; |
---|
1216 | iMBuff->dec = doubles_.su_dec[cSrcNo-1]; |
---|
1217 | } else { |
---|
1218 | iMBuff->ra = cU; |
---|
1219 | iMBuff->dec = cV; |
---|
1220 | } |
---|
1221 | cPosUTC[iBeamSel] = cW; |
---|
1222 | iMBuff->pCode = pCode; |
---|
1223 | |
---|
1224 | // Store rates for next time. |
---|
1225 | iMBuff->raRate = raRate; |
---|
1226 | iMBuff->decRate = decRate; |
---|
1227 | iMBuff->paRate = paRate; |
---|
1228 | } |
---|
1229 | |
---|
1230 | // IF-dependent parameters. |
---|
1231 | int iIF = cIFno - 1; |
---|
1232 | int startChan = cStartChan[iIF]; |
---|
1233 | int endChan = cEndChan[iIF]; |
---|
1234 | int refChan = cRefChan[iIF]; |
---|
1235 | |
---|
1236 | int nChan = abs(endChan - startChan) + 1; |
---|
1237 | |
---|
1238 | iIFSel = cIFSel[iIF]; |
---|
1239 | if (iMBuff->IFno[iIFSel] == 0) { |
---|
1240 | iMBuff->nIF++; |
---|
1241 | iMBuff->IFno[iIFSel] = cIFno; |
---|
1242 | } else { |
---|
1243 | // Integration cycle written to the output file twice (the only known |
---|
1244 | // example is 1999-05-22_1914_000-031805_03v.hpf). |
---|
1245 | sprintf(cMsg, "WARNING: Integration cycle %d:%d, beam %2d, \n" |
---|
1246 | " IF %d was duplicated.", cScanNo, cCycleNo-1, |
---|
1247 | beamNo, cIFno); |
---|
1248 | logMsg(cMsg); |
---|
1249 | } |
---|
1250 | iMBuff->nChan[iIFSel] = nChan; |
---|
1251 | iMBuff->nPol[iIFSel] = cNPol[iIF]; |
---|
1252 | |
---|
1253 | iMBuff->fqRefPix[iIFSel] = doubles_.if_ref[iIF]; |
---|
1254 | iMBuff->fqRefVal[iIFSel] = doubles_.if_freq[iIF]; |
---|
1255 | iMBuff->fqDelt[iIFSel] = |
---|
1256 | if_.if_invert[iIF] * fabs(doubles_.if_bw[iIF] / |
---|
1257 | (if_.if_nfreq[iIF] - 1)); |
---|
1258 | |
---|
1259 | // Adjust for channel selection. |
---|
1260 | if (iMBuff->fqRefPix[iIFSel] != refChan) { |
---|
1261 | iMBuff->fqRefVal[iIFSel] += |
---|
1262 | (refChan - iMBuff->fqRefPix[iIFSel]) * |
---|
1263 | iMBuff->fqDelt[iIFSel]; |
---|
1264 | iMBuff->fqRefPix[iIFSel] = refChan; |
---|
1265 | } |
---|
1266 | |
---|
1267 | if (endChan < startChan) { |
---|
1268 | iMBuff->fqDelt[iIFSel] = -iMBuff->fqDelt[iIFSel]; |
---|
1269 | } |
---|
1270 | |
---|
1271 | |
---|
1272 | // System temperature. |
---|
1273 | int iBeam = beamNo - 1; |
---|
1274 | int scq = sc_.sc_q; |
---|
1275 | float TsysPol1 = sc_.sc_cal[scq*iBeam + 3]; |
---|
1276 | float TsysPol2 = sc_.sc_cal[scq*iBeam + 4]; |
---|
1277 | iMBuff->tsys[iIFSel][0] = TsysPol1*TsysPol1; |
---|
1278 | iMBuff->tsys[iIFSel][1] = TsysPol2*TsysPol2; |
---|
1279 | |
---|
1280 | // Calibration factor; may be changed later if the data is recalibrated. |
---|
1281 | if (scq > 14) { |
---|
1282 | // Will only be present for Parkes Multibeam or LBA data. |
---|
1283 | iMBuff->calfctr[iIFSel][0] = sc_.sc_cal[scq*iBeam + 14]; |
---|
1284 | iMBuff->calfctr[iIFSel][1] = sc_.sc_cal[scq*iBeam + 15]; |
---|
1285 | } else { |
---|
1286 | iMBuff->calfctr[iIFSel][0] = 0.0f; |
---|
1287 | iMBuff->calfctr[iIFSel][1] = 0.0f; |
---|
1288 | } |
---|
1289 | |
---|
1290 | // Cross-polarization calibration factor (unknown to MBFITS). |
---|
1291 | for (int j = 0; j < 2; j++) { |
---|
1292 | iMBuff->xcalfctr[iIFSel][j] = 0.0f; |
---|
1293 | } |
---|
1294 | |
---|
1295 | // Baseline parameters (unknown to MBFITS). |
---|
1296 | iMBuff->haveBase = 0; |
---|
1297 | |
---|
1298 | // Data (always present in MBFITS). |
---|
1299 | iMBuff->haveSpectra = 1; |
---|
1300 | |
---|
1301 | // Flag: bit 0 set if off source. |
---|
1302 | // bit 1 set if loss of sync in A polarization. |
---|
1303 | // bit 2 set if loss of sync in B polarization. |
---|
1304 | unsigned char rpflag = |
---|
1305 | (unsigned char)(sc_.sc_cal[scq*iBeam + 12] + 0.5f); |
---|
1306 | |
---|
1307 | // The baseline flag may be set independently. |
---|
1308 | if (rpflag == 0) rpflag = cFlag; |
---|
1309 | |
---|
1310 | // Copy and scale data. |
---|
1311 | int inc = 2 * if_.if_nstok[iIF]; |
---|
1312 | if (endChan < startChan) inc = -inc; |
---|
1313 | |
---|
1314 | float TsysF; |
---|
1315 | iMBuff->spectra[iIFSel] = iMBuff->spectra[0] + cChanOff[iIF]; |
---|
1316 | iMBuff->flagged[iIFSel] = iMBuff->flagged[0] + cChanOff[iIF]; |
---|
1317 | |
---|
1318 | float *spectra = iMBuff->spectra[iIFSel]; |
---|
1319 | unsigned char *flagged = iMBuff->flagged[iIFSel]; |
---|
1320 | for (int ipol = 0; ipol < cNPol[iIF]; ipol++) { |
---|
1321 | if (sc_.sc_cal[scq*iBeam + 3 + ipol] > 0.0f) { |
---|
1322 | // The correlator has already applied the calibration. |
---|
1323 | TsysF = 1.0f; |
---|
1324 | } else { |
---|
1325 | // The correlator has normalized cVis[k] to a Tsys of 500K. |
---|
1326 | TsysF = iMBuff->tsys[iIFSel][ipol] / 500.0f; |
---|
1327 | } |
---|
1328 | |
---|
1329 | int k = 2 * (if_.if_nstok[iIF]*(startChan - 1) + ipol); |
---|
1330 | for (int ichan = 0; ichan < nChan; ichan++) { |
---|
1331 | *(spectra++) = TsysF * cVis[k]; |
---|
1332 | *(flagged++) = rpflag; |
---|
1333 | k += inc; |
---|
1334 | } |
---|
1335 | } |
---|
1336 | |
---|
1337 | if (cHaveXPol[iIF]) { |
---|
1338 | int k = 2 * (3*(startChan - 1) + 2); |
---|
1339 | iMBuff->xpol[iIFSel] = iMBuff->xpol[0] + cXpolOff[iIF]; |
---|
1340 | float *xpol = iMBuff->xpol[iIFSel]; |
---|
1341 | for (int ichan = 0; ichan < nChan; ichan++) { |
---|
1342 | *(xpol++) = cVis[k]; |
---|
1343 | *(xpol++) = cVis[k+1]; |
---|
1344 | k += inc; |
---|
1345 | } |
---|
1346 | } |
---|
1347 | |
---|
1348 | |
---|
1349 | // Calibration factor applied to the data by the correlator. |
---|
1350 | if (scq > 14) { |
---|
1351 | // Will only be present for Parkes Multibeam or LBA data. |
---|
1352 | iMBuff->tcal[iIFSel][0] = sc_.sc_cal[scq*iBeam + 14]; |
---|
1353 | iMBuff->tcal[iIFSel][1] = sc_.sc_cal[scq*iBeam + 15]; |
---|
1354 | } else { |
---|
1355 | iMBuff->tcal[iIFSel][0] = 0.0f; |
---|
1356 | iMBuff->tcal[iIFSel][1] = 0.0f; |
---|
1357 | } |
---|
1358 | |
---|
1359 | if (firstIF) { |
---|
1360 | if (sc_.sc_ant <= anten_.nant) { |
---|
1361 | // No extra syscal information present. |
---|
1362 | iMBuff->extraSysCal = 0; |
---|
1363 | iMBuff->azimuth = 0.0f; |
---|
1364 | iMBuff->elevation = 0.0f; |
---|
1365 | iMBuff->parAngle = 0.0f; |
---|
1366 | iMBuff->focusAxi = 0.0f; |
---|
1367 | iMBuff->focusTan = 0.0f; |
---|
1368 | iMBuff->focusRot = 0.0f; |
---|
1369 | iMBuff->temp = 0.0f; |
---|
1370 | iMBuff->pressure = 0.0f; |
---|
1371 | iMBuff->humidity = 0.0f; |
---|
1372 | iMBuff->windSpeed = 0.0f; |
---|
1373 | iMBuff->windAz = 0.0f; |
---|
1374 | strcpy(iMBuff->tcalTime, " "); |
---|
1375 | iMBuff->refBeam = 0; |
---|
1376 | |
---|
1377 | } else { |
---|
1378 | // Additional information for Parkes Multibeam data. |
---|
1379 | int iOff = scq*(sc_.sc_ant - 1) - 1; |
---|
1380 | iMBuff->extraSysCal = 1; |
---|
1381 | |
---|
1382 | iMBuff->azimuth = sc_.sc_cal[iOff + 2]; |
---|
1383 | iMBuff->elevation = sc_.sc_cal[iOff + 3]; |
---|
1384 | iMBuff->parAngle = sc_.sc_cal[iOff + 4]; |
---|
1385 | |
---|
1386 | iMBuff->focusAxi = sc_.sc_cal[iOff + 5] * 1e-3; |
---|
1387 | iMBuff->focusTan = sc_.sc_cal[iOff + 6] * 1e-3; |
---|
1388 | iMBuff->focusRot = sc_.sc_cal[iOff + 7]; |
---|
1389 | |
---|
1390 | iMBuff->temp = sc_.sc_cal[iOff + 8]; |
---|
1391 | iMBuff->pressure = sc_.sc_cal[iOff + 9]; |
---|
1392 | iMBuff->humidity = sc_.sc_cal[iOff + 10]; |
---|
1393 | iMBuff->windSpeed = sc_.sc_cal[iOff + 11]; |
---|
1394 | iMBuff->windAz = sc_.sc_cal[iOff + 12]; |
---|
1395 | |
---|
1396 | char *tcalTime = iMBuff->tcalTime; |
---|
1397 | sprintf(tcalTime, "%-16.16s", (char *)(&sc_.sc_cal[iOff+13])); |
---|
1398 | tcalTime[16] = '\0'; |
---|
1399 | |
---|
1400 | #ifndef AIPS_LITTLE_ENDIAN |
---|
1401 | // Do byte swapping on the ASCII date string. |
---|
1402 | for (int j = 0; j < 16; j += 4) { |
---|
1403 | char ctmp; |
---|
1404 | ctmp = tcalTime[j]; |
---|
1405 | tcalTime[j] = tcalTime[j+3]; |
---|
1406 | tcalTime[j+3] = ctmp; |
---|
1407 | ctmp = tcalTime[j+1]; |
---|
1408 | tcalTime[j+1] = tcalTime[j+2]; |
---|
1409 | tcalTime[j+2] = ctmp; |
---|
1410 | } |
---|
1411 | #endif |
---|
1412 | |
---|
1413 | // Reference beam number. |
---|
1414 | float refbeam = sc_.sc_cal[iOff + 17]; |
---|
1415 | if (refbeam > 0.0f || refbeam < 100.0f) { |
---|
1416 | iMBuff->refBeam = int(refbeam); |
---|
1417 | } else { |
---|
1418 | iMBuff->refBeam = 0; |
---|
1419 | } |
---|
1420 | } |
---|
1421 | } |
---|
1422 | } |
---|
1423 | } |
---|
1424 | |
---|
1425 | return 0; |
---|
1426 | } |
---|
1427 | |
---|
1428 | //-------------------------------------------------------- MBFITSreader::rpget |
---|
1429 | |
---|
1430 | // Read the next data record from the RPFITS file. |
---|
1431 | |
---|
1432 | int MBFITSreader::rpget(int syscalonly, int &EOS) |
---|
1433 | { |
---|
1434 | EOS = 0; |
---|
1435 | |
---|
1436 | int retries = 0; |
---|
1437 | |
---|
1438 | // Allow 10 read errors. |
---|
1439 | int numErr = 0; |
---|
1440 | |
---|
1441 | int jstat = 0; |
---|
1442 | while (numErr < 10) { |
---|
1443 | int lastjstat = jstat; |
---|
1444 | |
---|
1445 | switch(rpfitsin(jstat)) { |
---|
1446 | case -1: |
---|
1447 | // Read failed; retry. |
---|
1448 | numErr++; |
---|
1449 | logMsg("WARNING: RPFITS read failed - retrying."); |
---|
1450 | jstat = 0; |
---|
1451 | break; |
---|
1452 | |
---|
1453 | case 0: |
---|
1454 | // Successful read. |
---|
1455 | if (lastjstat == 0) { |
---|
1456 | if (cBaseline == -1) { |
---|
1457 | // Syscal data. |
---|
1458 | if (syscalonly) { |
---|
1459 | return 0; |
---|
1460 | } |
---|
1461 | |
---|
1462 | } else { |
---|
1463 | if (!syscalonly) { |
---|
1464 | return 0; |
---|
1465 | } |
---|
1466 | } |
---|
1467 | } |
---|
1468 | |
---|
1469 | // Last operation was to read header or FG table; now read data. |
---|
1470 | break; |
---|
1471 | |
---|
1472 | case 1: |
---|
1473 | // Encountered header while trying to read data; read it. |
---|
1474 | EOS = 1; |
---|
1475 | jstat = -1; |
---|
1476 | break; |
---|
1477 | |
---|
1478 | case 2: |
---|
1479 | // End of scan; read past it. |
---|
1480 | jstat = 0; |
---|
1481 | break; |
---|
1482 | |
---|
1483 | case 3: |
---|
1484 | // End-of-file; retry applies to real-time mode. |
---|
1485 | if (retries++ >= cRetry) { |
---|
1486 | return -1; |
---|
1487 | } |
---|
1488 | |
---|
1489 | sleep(10); |
---|
1490 | jstat = 0; |
---|
1491 | break; |
---|
1492 | |
---|
1493 | case 4: |
---|
1494 | // Encountered FG table while trying to read data; read it. |
---|
1495 | jstat = -1; |
---|
1496 | break; |
---|
1497 | |
---|
1498 | case 5: |
---|
1499 | // Illegal data at end of block after close/reopen operation; retry. |
---|
1500 | jstat = 0; |
---|
1501 | break; |
---|
1502 | |
---|
1503 | default: |
---|
1504 | // Shouldn't reach here. |
---|
1505 | sprintf(cMsg, "WARNING: Unrecognized RPFITSIN return code: %d " |
---|
1506 | "(retrying).", jstat); |
---|
1507 | logMsg(cMsg); |
---|
1508 | jstat = 0; |
---|
1509 | break; |
---|
1510 | } |
---|
1511 | } |
---|
1512 | |
---|
1513 | logMsg("ERROR: RPFITS read failed too many times."); |
---|
1514 | return 2; |
---|
1515 | } |
---|
1516 | |
---|
1517 | //----------------------------------------------------- MBFITSreader::rpfitsin |
---|
1518 | |
---|
1519 | // Wrapper around RPFITSIN that reports errors. Returned RPFITSIN subroutine |
---|
1520 | // arguments are captured as MBFITSreader member variables. |
---|
1521 | |
---|
1522 | int MBFITSreader::rpfitsin(int &jstat) |
---|
1523 | |
---|
1524 | { |
---|
1525 | rpfitsin_(&jstat, cVis, cWgt, &cBaseline, &cUTC, &cU, &cV, &cW, &cFlag, |
---|
1526 | &cBin, &cIFno, &cSrcNo); |
---|
1527 | |
---|
1528 | // Handle messages from RPFITSIN. |
---|
1529 | if (names_.errmsg[0] != ' ') { |
---|
1530 | int i; |
---|
1531 | for (i = 80; i > 0; i--) { |
---|
1532 | if (names_.errmsg[i-1] != ' ') break; |
---|
1533 | } |
---|
1534 | |
---|
1535 | sprintf(cMsg, "WARNING: Cycle %d:%03d, RPFITSIN reported -\n" |
---|
1536 | " %.*s", cScanNo, cCycleNo, i, names_.errmsg); |
---|
1537 | logMsg(cMsg); |
---|
1538 | } |
---|
1539 | |
---|
1540 | return jstat; |
---|
1541 | } |
---|
1542 | |
---|
1543 | //------------------------------------------------------- MBFITSreader::fixPos |
---|
1544 | |
---|
1545 | // Check and, if necessary, repair a position timestamp. |
---|
1546 | // |
---|
1547 | // Problems with the position timestamp manifest themselves via the scan rate: |
---|
1548 | // |
---|
1549 | // 1) Zero scan rate pairs, 1997/02/28 to 1998/01/07 |
---|
1550 | // |
---|
1551 | // These occur because the position timestamp for the first integration |
---|
1552 | // of the pair is erroneous; the value recorded is t/1000, where t is the |
---|
1553 | // true value. |
---|
1554 | // Earliest known: 97-02-28_1725_132653-42_258a.hpf |
---|
1555 | // Latest known: 98-01-02_1923_095644-50_165c.hpf |
---|
1556 | // (time range chosen to encompass observing runs). |
---|
1557 | // |
---|
1558 | // 2) Slow-fast scan rate pairs (0.013 - 0.020 deg/s), |
---|
1559 | // 1997/03/28 to 1998/01/07. |
---|
1560 | // |
---|
1561 | // The UTC position timestamp is 1.0s later than it should be (never |
---|
1562 | // earlier), almost certainly arising from an error in the telescope |
---|
1563 | // control system. |
---|
1564 | // Earliest known: 97-03-28_0150_010420-74_008d.hpf |
---|
1565 | // Latest known: 98-01-04_1502_065150-02_177c.hpf |
---|
1566 | // (time range chosen to encompass observing runs). |
---|
1567 | // |
---|
1568 | // 3) Slow-fast scan rate pairs (0.015 - 0.018 deg/s), |
---|
1569 | // 1999/05/20 to 2001/07/12 (HIPASS and ZOA), |
---|
1570 | // 2001/09/02 to 2001/12/04 (HIPASS and ZOA), |
---|
1571 | // 2002/03/28 to 2002/05/13 (ZOA only), |
---|
1572 | // 2003/04/26 to 2003/06/09 (ZOA only). |
---|
1573 | // Earliest known: 1999-05-20_1818_175720-50_297e.hpf |
---|
1574 | // Latest known: 2001-12-04_1814_065531p14_173e.hpf (HIPASS) |
---|
1575 | // 2003-06-09_1924_352-085940_-6c.hpf (ZOA) |
---|
1576 | // |
---|
1577 | // Caused by the Linux signalling NaN problem. IEEE "signalling" NaNs |
---|
1578 | // are silently transformed to "quiet" NaNs during assignment by setting |
---|
1579 | // bit 22. This affected RPFITS because of its use of VAX-format |
---|
1580 | // floating-point numbers which, with their permuted bytes, may sometimes |
---|
1581 | // appear as signalling NaNs. |
---|
1582 | // |
---|
1583 | // The problem arose when the linux correlator came online and was |
---|
1584 | // fixed with a workaround to the RPFITS library (repeated episodes |
---|
1585 | // are probably due to use of an older version of the library). It |
---|
1586 | // should not have affected the data significantly because of the |
---|
1587 | // low relative error, which ranges from 0.0000038 to 0.0000076, but |
---|
1588 | // it is important for the computation of scan rates which requires |
---|
1589 | // taking the difference of two large UTC timestamps, one or other |
---|
1590 | // of which will have 0.5s added to it. |
---|
1591 | // |
---|
1592 | // The return value identifies which, if any, of these problems was repaired. |
---|
1593 | |
---|
1594 | int MBFITSreader::fixw( |
---|
1595 | const char *datobs, |
---|
1596 | int cycleNo, |
---|
1597 | int beamNo, |
---|
1598 | double avRate[2], |
---|
1599 | double thisRA, |
---|
1600 | double thisDec, |
---|
1601 | double thisUTC, |
---|
1602 | double nextRA, |
---|
1603 | double nextDec, |
---|
1604 | float &nextUTC) |
---|
1605 | { |
---|
1606 | if (strcmp(datobs, "2003-06-09") > 0) { |
---|
1607 | return 0; |
---|
1608 | |
---|
1609 | } else if (strcmp(datobs, "1998-01-07") <= 0) { |
---|
1610 | if (nextUTC < thisUTC && (nextUTC + 86400.0) > (thisUTC + 600.0)) { |
---|
1611 | // Possible scaling problem. |
---|
1612 | double diff = nextUTC*1000.0 - thisUTC; |
---|
1613 | if (0.0 < diff && diff < 600.0) { |
---|
1614 | nextUTC *= 1000.0; |
---|
1615 | return 1; |
---|
1616 | } else { |
---|
1617 | // Irreparable. |
---|
1618 | return -1; |
---|
1619 | } |
---|
1620 | } |
---|
1621 | |
---|
1622 | if (cycleNo > 2) { |
---|
1623 | if (beamNo == 1) { |
---|
1624 | // This test is only reliable for beam 1. |
---|
1625 | double dUTC = nextUTC - thisUTC; |
---|
1626 | if (dUTC < 0.0) dUTC += 86400.0; |
---|
1627 | |
---|
1628 | // Guard against RA cycling through 24h in either direction. |
---|
1629 | if (fabs(nextRA - thisRA) > PI) { |
---|
1630 | if (nextRA < thisRA) { |
---|
1631 | nextRA += TWOPI; |
---|
1632 | } else { |
---|
1633 | nextRA -= TWOPI; |
---|
1634 | } |
---|
1635 | } |
---|
1636 | |
---|
1637 | double dRA = (nextRA - thisRA) * cos(nextDec); |
---|
1638 | double dDec = nextDec - thisDec; |
---|
1639 | double arc = sqrt(dRA*dRA + dDec*dDec); |
---|
1640 | |
---|
1641 | double averate = sqrt(avRate[0]*avRate[0] + avRate[1]*avRate[1]); |
---|
1642 | double diff1 = fabs(averate - arc/(dUTC-1.0)); |
---|
1643 | double diff2 = fabs(averate - arc/dUTC); |
---|
1644 | if ((diff1 < diff2) && (diff1 < 0.05*averate)) { |
---|
1645 | nextUTC -= 1.0; |
---|
1646 | cCode5 = cycleNo; |
---|
1647 | return 2; |
---|
1648 | } else { |
---|
1649 | cCode5 = 0; |
---|
1650 | } |
---|
1651 | |
---|
1652 | } else { |
---|
1653 | if (cycleNo == cCode5) { |
---|
1654 | nextUTC -= 1.0; |
---|
1655 | return 2; |
---|
1656 | } |
---|
1657 | } |
---|
1658 | } |
---|
1659 | |
---|
1660 | } else if ((strcmp(datobs, "1999-05-20") >= 0 && |
---|
1661 | strcmp(datobs, "2001-07-12") <= 0) || |
---|
1662 | (strcmp(datobs, "2001-09-02") >= 0 && |
---|
1663 | strcmp(datobs, "2001-12-04") <= 0) || |
---|
1664 | (strcmp(datobs, "2002-03-28") >= 0 && |
---|
1665 | strcmp(datobs, "2002-05-13") <= 0) || |
---|
1666 | (strcmp(datobs, "2003-04-26") >= 0 && |
---|
1667 | strcmp(datobs, "2003-06-09") <= 0)) { |
---|
1668 | // Signalling NaN problem, e.g. 1999-07-26_1839_011106-74_009c.hpf. |
---|
1669 | // Position timestamps should always be an integral number of seconds. |
---|
1670 | double resid = nextUTC - int(nextUTC); |
---|
1671 | if (resid == 0.5) { |
---|
1672 | nextUTC -= 0.5; |
---|
1673 | return 3; |
---|
1674 | } |
---|
1675 | } |
---|
1676 | |
---|
1677 | return 0; |
---|
1678 | } |
---|
1679 | |
---|
1680 | //-------------------------------------------------------- MBFITSreader::close |
---|
1681 | |
---|
1682 | // Close the input file. |
---|
1683 | |
---|
1684 | void MBFITSreader::close(void) |
---|
1685 | { |
---|
1686 | if (cMBopen) { |
---|
1687 | int jstat = 1; |
---|
1688 | rpfitsin_(&jstat, cVis, cWgt, &cBaseline, &cUTC, &cU, &cV, &cW, &cFlag, |
---|
1689 | &cBin, &cIFno, &cSrcNo); |
---|
1690 | |
---|
1691 | if (cBeams) delete [] cBeams; |
---|
1692 | if (cIFs) delete [] cIFs; |
---|
1693 | if (cNChan) delete [] cNChan; |
---|
1694 | if (cNPol) delete [] cNPol; |
---|
1695 | if (cHaveXPol) delete [] cHaveXPol; |
---|
1696 | if (cStartChan) delete [] cStartChan; |
---|
1697 | if (cEndChan) delete [] cEndChan; |
---|
1698 | if (cRefChan) delete [] cRefChan; |
---|
1699 | |
---|
1700 | if (cVis) delete [] cVis; |
---|
1701 | if (cWgt) delete [] cWgt; |
---|
1702 | |
---|
1703 | if (cBeamSel) delete [] cBeamSel; |
---|
1704 | if (cIFSel) delete [] cIFSel; |
---|
1705 | if (cChanOff) delete [] cChanOff; |
---|
1706 | if (cXpolOff) delete [] cXpolOff; |
---|
1707 | if (cBuffer) delete [] cBuffer; |
---|
1708 | if (cPosUTC) delete [] cPosUTC; |
---|
1709 | |
---|
1710 | cMBopen = 0; |
---|
1711 | } |
---|
1712 | } |
---|
1713 | |
---|
1714 | //-------------------------------------------------------------------- utcDiff |
---|
1715 | |
---|
1716 | // Subtract two UTCs (s) allowing for any plausible number of cycles through |
---|
1717 | // 86400s, returning a result in the range [-43200, +43200]s. |
---|
1718 | |
---|
1719 | double MBFITSreader::utcDiff(double utc1, double utc2) |
---|
1720 | { |
---|
1721 | double diff = utc1 - utc2; |
---|
1722 | |
---|
1723 | if (diff > 43200.0) { |
---|
1724 | diff -= 86400.0; |
---|
1725 | while (diff > 43200.0) diff -= 86400.0; |
---|
1726 | } else if (diff < -43200.0) { |
---|
1727 | diff += 86400.0; |
---|
1728 | while (diff < -43200.0) diff += 86400.0; |
---|
1729 | } |
---|
1730 | |
---|
1731 | return diff; |
---|
1732 | } |
---|
1733 | |
---|
1734 | //------------------------------------------------------- scanRate & applyRate |
---|
1735 | |
---|
1736 | // Compute and apply the scan rate corrected for grid convergence. (ra0,dec0) |
---|
1737 | // are the coordinates of the central beam, assumed to be the tracking centre. |
---|
1738 | // The rate computed in RA will be a rate of change of angular distance in the |
---|
1739 | // direction of increasing RA at the position of the central beam. Similarly |
---|
1740 | // for declination. Angles in radian, time in s. |
---|
1741 | |
---|
1742 | void MBFITSreader::scanRate( |
---|
1743 | double ra0, |
---|
1744 | double dec0, |
---|
1745 | double ra1, |
---|
1746 | double dec1, |
---|
1747 | double ra2, |
---|
1748 | double dec2, |
---|
1749 | double dt, |
---|
1750 | double &raRate, |
---|
1751 | double &decRate) |
---|
1752 | { |
---|
1753 | // Transform to a system where the central beam lies on the equator at 12h. |
---|
1754 | eulerx(ra1, dec1, ra0+HALFPI, -dec0, -HALFPI, ra1, dec1); |
---|
1755 | eulerx(ra2, dec2, ra0+HALFPI, -dec0, -HALFPI, ra2, dec2); |
---|
1756 | |
---|
1757 | raRate = (ra2 - ra1) / dt; |
---|
1758 | decRate = (dec2 - dec1) / dt; |
---|
1759 | } |
---|
1760 | |
---|
1761 | |
---|
1762 | void MBFITSreader::applyRate( |
---|
1763 | double ra0, |
---|
1764 | double dec0, |
---|
1765 | double ra1, |
---|
1766 | double dec1, |
---|
1767 | double raRate, |
---|
1768 | double decRate, |
---|
1769 | double dt, |
---|
1770 | double &ra2, |
---|
1771 | double &dec2) |
---|
1772 | { |
---|
1773 | // Transform to a system where the central beam lies on the equator at 12h. |
---|
1774 | eulerx(ra1, dec1, ra0+HALFPI, -dec0, -HALFPI, ra1, dec1); |
---|
1775 | |
---|
1776 | ra2 = ra1 + (raRate * dt); |
---|
1777 | dec2 = dec1 + (decRate * dt); |
---|
1778 | |
---|
1779 | // Transform back. |
---|
1780 | eulerx(ra2, dec2, -HALFPI, dec0, ra0+HALFPI, ra2, dec2); |
---|
1781 | } |
---|
1782 | |
---|
1783 | //--------------------------------------------------------------------- eulerx |
---|
1784 | |
---|
1785 | void MBFITSreader::eulerx( |
---|
1786 | double lng0, |
---|
1787 | double lat0, |
---|
1788 | double phi0, |
---|
1789 | double theta, |
---|
1790 | double phi, |
---|
1791 | double &lng1, |
---|
1792 | double &lat1) |
---|
1793 | |
---|
1794 | // Applies the Euler angle based transformation of spherical coordinates. |
---|
1795 | // |
---|
1796 | // phi0 Longitude of the ascending node in the old system, radians. The |
---|
1797 | // ascending node is the point of intersection of the equators of |
---|
1798 | // the two systems such that the equator of the new system crosses |
---|
1799 | // from south to north as viewed in the old system. |
---|
1800 | // |
---|
1801 | // theta Angle between the poles of the two systems, radians. THETA is |
---|
1802 | // positive for a positive rotation about the ascending node. |
---|
1803 | // |
---|
1804 | // phi Longitude of the ascending node in the new system, radians. |
---|
1805 | |
---|
1806 | { |
---|
1807 | // Compute intermediaries. |
---|
1808 | double lng0p = lng0 - phi0; |
---|
1809 | double slng0p = sin(lng0p); |
---|
1810 | double clng0p = cos(lng0p); |
---|
1811 | double slat0 = sin(lat0); |
---|
1812 | double clat0 = cos(lat0); |
---|
1813 | double ctheta = cos(theta); |
---|
1814 | double stheta = sin(theta); |
---|
1815 | |
---|
1816 | double x = clat0*clng0p; |
---|
1817 | double y = clat0*slng0p*ctheta + slat0*stheta; |
---|
1818 | |
---|
1819 | // Longitude in the new system. |
---|
1820 | if (x != 0.0 || y != 0.0) { |
---|
1821 | lng1 = phi + atan2(y, x); |
---|
1822 | } else { |
---|
1823 | // Longitude at the poles in the new system is consistent with that |
---|
1824 | // specified in the old system. |
---|
1825 | lng1 = phi + lng0p; |
---|
1826 | } |
---|
1827 | lng1 = fmod(lng1, TWOPI); |
---|
1828 | if (lng1 < 0.0) lng1 += TWOPI; |
---|
1829 | |
---|
1830 | lat1 = asin(slat0*ctheta - clat0*stheta*slng0p); |
---|
1831 | } |
---|