Changes between Version 39 and Version 40 of Changes/atlod

Timestamp:

03/06/07 13:55:20 (17 years ago)

Author:

mci156

Comment:

--

Changes/atlod

@@ -16 +16 @@
 
  SamplerStatistics::
- we no longer use these. So we need to avoid checking for them with CABB-type data.
+ Not present in CABB data; do not execute flagging or "samcorr" code.
  StorageOfSYSCALData::
- Now that there are no sampler statistics, we need a different way of carrying along [wiki:Glossary/Tsys Tsys] and  
- [wiki:Glossary/XYPhase XYPhase] data than we have at present. 
- At present there are 24 scalar values of Tsys (6 antennae * 2 polarizations * 2 IFs) written into every integration, and
+ AT correlator data format holds 24 scalar values of Tsys (6 antennae * 2 polarizations * 2 IFs) written into every integration, and
  12 (6 ant. * 2 IFs) of XYPhase.[[BR]]
  [[BR]]
@@ -29 +27 @@
  Deciding what to do here in terms of data representation requires discussions with WarwickWilson.
  Making changes here has flow on effects to other tasks that use Tsys or XYPhase.
+ CABB data will include autocorrelation for both ON and OFF phases of the switched noise diode.[[BR]]
+ ATLOD will calculate
+   Tsys(f) = OFF(f) * Tcal(f) / ( ON(f) - OFF(f) )
+ for each of the XX and YY polarization products. In the equation above 'f' is the frequency.[[BR]]
+ Tcal(f) will be included in the RPFITS file once per scan.[[BR]]
+ ATLOD will also calculate
+   XYPhase(f) = arg( XYPhase_ON(f) - XYPhase_OFF(f) )
+ ATLOD will record in the Miriad data TsysX(f), TsysY(f) and XYPhase(f).
+ Input option 'noauto' will determine whether autocorrelation spectra are kepts.
  ApplyingXYPhaseCorrections::
  At present atlod applies the XYPhase during filling. Nothing else (except maybe [http://www.atnf.csiro.au/computing/software/miriad/doc/atxy.html atxy]) uses them.