Changes between Version 31 and Version 32 of Changes/atlod
- Timestamp:
- 03/06/07 12:13:02 (17 years ago)
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Changes/atlod
v31 v32 17 17 SamplerStatistics:: 18 18 we no longer use these. So we need to avoid checking for them with CABB-type data. 19 20 19 StorageOfSYSCALData:: 21 20 Now that there are no sampler statistics, we need a different way of carrying along [wiki:Glossary/Tsys Tsys] and … … 26 25 In the new system there will likely be a spectrum of each, in the form of autocorrelations. 27 26 Tsys is formed from the XX and YY polarisations of the autocorrelations, with the noise diode on and off; 28 XYPhase from the XY (or its conjugate, YX) with the diode on and off. 29 27 XYPhase from the XY (or its conjugate, YX) with the diode on and off.[[BR]] 28 [[BR]] 30 29 Deciding what to do here in terms of data representation requires discussions with WarwickWilson. 31 30 Making changes here has flow on effects to other tasks that use Tsys or XYPhase. 32 33 31 ApplyingXYPhaseCorrections:: 34 32 At present atlod applies the XYPhase during filling. Nothing else (except maybe atxy) uses them. … … 39 37 We will need to carry Tsys info along but may be able to do it more compactly than storing the autocorrelations themselves.[[BR]] 40 38 [[BR]] 41 Research required: The phase values computed on a per channel basis will be noisy, and applying them will just introduce noise.39 Research needed: The phase values computed on a per channel basis will be noisy, and applying them will just introduce noise. 42 40 We need to understand how much smoothing across frequency will be needed. 43 41 Need to do some experiments to understand the sequence of events in reading in a file. 44 42 45 43 == DataSizeLimits == 46 Research required: need to check for size limits on the data dimensions - number of windows, channels, etc44 Research needed: need to check for size limits on the data dimensions - number of windows, channels, etc 47 45 48 46 == [wiki:XYPhaseCalibration] == … … 69 67 This requires more selection options than is available with 'ifsel'. 70 68 71 Research required: need to list out the types of datasets that are likely to be written and then decide what69 Research needed: need to list out the types of datasets that are likely to be written and then decide what 72 70 the "sub-selectable" elements are. 73 71
