Changes between Version 26 and Version 27 of Changes/atlod


Ignore:
Timestamp:
03/06/07 12:05:34 (17 years ago)
Author:
mci156
Comment:

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  • Changes/atlod

    v26 v27  
    2222 [wiki:Glossary/XYPhase XYPhase] data than we have at present.
    2323 At present there are 24 scalar values of Tsys (6 antennae * 2 polarizations * 2 IFs) written into every integration, and
    24  12 (6 ant. * 2 IFs) of XYPhase.[BR]
    25  [BR]
     24 12 (6 ant. * 2 IFs) of XYPhase.[[BR]]
     25 [[BR]]
    2626 In the new system there will likely be a spectrum of each, in the form of autocorrelations.
    2727 Tsys is formed from the XX and YY polarisations of the autocorrelations, with the noise diode on and off;
    … …  
    3737 (and after SYSCAL records), so that the corrections for the cross-correlation can be computed
    3838 before reaching the cross-correlations.
    39  We will need to carry Tsys info along but may be able to do it more compactly than storing the autocorrelations themselves.[BR]
    40 [BR]
     39 We will need to carry Tsys info along but may be able to do it more compactly than storing the autocorrelations themselves.[[BR]]
     40 [[BR]]
    4141 Research required: The phase values computed on a per channel basis will be noisy, and applying them will just introduce noise.
    4242 We need to understand how much smoothing across frequency will be needed.
    … …  
    4444
    4545 == DataSizeLimits ==
    46   Research required: need to check for size limits on the data dimensions - number of windows, channels, etc
     46 Research required: need to check for size limits on the data dimensions - number of windows, channels, etc
    4747
    4848 == [wiki:XYPhaseCalibration] ==
    49   instead of a single (instrumental) XY phase term, we will now get all the autocorellations.
    50   This has the potential to greatly inflate the data volume.
     49 instead of a single (instrumental) XY phase term, we will now get all the autocorellations.
     50 This has the potential to greatly inflate the data volume.
    5151
    5252 == IdentifyParentWindow ==
    53   Each spectral window output by the correlator can have some [wiki:Glossary/ZoomBands ZoomBands] defined.
    54   We think that it will be necessary to keep track of each window's parent window. There should only be 0 or 1 parents.
     53 Each spectral window output by the correlator can have some [wiki:Glossary/ZoomBands ZoomBands] defined.
     54 We think that it will be necessary to keep track of each window's parent window. There should only be 0 or 1 parents.
    5555
    56   Research needed: Whether it is necessary to keep track of the children of a particular band is unclear.
     56 Research needed: Whether it is necessary to keep track of the children of a particular band is unclear.
    5757
    5858 == [wiki:FlaggingWithinATLOD] ==
    59   [http://www.atnf.csiro.au/computing/software/miriad/doc/atlod.html atlod] does a qualitatively different type of
    60   flagging to other parts of Miriad; it drops data from the output instead of just marking it as bad.
     59 [http://www.atnf.csiro.au/computing/software/miriad/doc/atlod.html atlod] does a qualitatively different type of
     60 flagging to other parts of Miriad; it drops data from the output instead of just marking it as bad.
    6161
    62   There are two possible types of flagging-related changes.
    63   * basic things like removal of [wiki:Glossary/Birdies birdies] - there are likely to be some new ones.[BR]
    64     Research needed: locations of birdies; will there be new types of flags on scans that indicate bad data?
    65   * Possibly using the [Glossary/AutoCorrelations autocorrelations] to flag data affected by interference.
     62 There are two possible types of flagging-related changes.
     63 * basic things like removal of [wiki:Glossary/Birdies birdies] - there are likely to be some new ones.[BR]
     64   Research needed: locations of birdies; will there be new types of flags on scans that indicate bad data?
     65 * Possibly using the [Glossary/AutoCorrelations autocorrelations] to flag data affected by interference.
    6666
    6767 == MoreSelectionOptions ==
    68   People will want to atlod just a subset of the data, not the whole thing.
    69   This requires more selection options than is available with 'ifsel'.
     68 People will want to atlod just a subset of the data, not the whole thing.
     69 This requires more selection options than is available with 'ifsel'.
    7070
    71   Research required: need to list out the types of datasets that are likely to be written and then decide what
    72   the "sub-selectable" elements are.
     71 Research required: need to list out the types of datasets that are likely to be written and then decide what
     72 the "sub-selectable" elements are.
    7373
    7474