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difx:amplitudescaling [2010/11/19 06:06]
adamdeller
difx:amplitudescaling [2015/10/21 10:08] (current)
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 ===== Amplitude scaling in General ===== ===== Amplitude scaling in General =====
  
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 The level of correction done online by DiFX is controlled by the TSYS entry in the DATASTREAM table entries of the .input file.  If TSYS < = 0, only the first two steps are done.  If TSYS=1.0, all steps excepting the last two are done.  If TSYS = (some nominal tsys value), then all steps except the last are performed. ​ This was originally the default (and indeed only, in early versions) behaviour in DiFX, since it was what the old LBA hardware correlator did.  It has the advantage of allowing quick-look processing of the data without any further calibration. ​ However, it also means that the a priori values of system temperature must be un-applied when measured system temperatures are later applied, and hence this is not widely used outside the LBA. The level of correction done online by DiFX is controlled by the TSYS entry in the DATASTREAM table entries of the .input file.  If TSYS < = 0, only the first two steps are done.  If TSYS=1.0, all steps excepting the last two are done.  If TSYS = (some nominal tsys value), then all steps except the last are performed. ​ This was originally the default (and indeed only, in early versions) behaviour in DiFX, since it was what the old LBA hardware correlator did.  It has the advantage of allowing quick-look processing of the data without any further calibration. ​ However, it also means that the a priori values of system temperature must be un-applied when measured system temperatures are later applied, and hence this is not widely used outside the LBA.
  
-Each step will now be considered in more detail+Each step will now be considered in more detail.
  
 ==== 1. Forming unnormalised correlation counts ==== ==== 1. Forming unnormalised correlation counts ====
difx/amplitudescaling.txt · Last modified: 2015/10/21 10:08 (external edit)