removing linear baselines before 2d crossfits

28mar23

Intro

      The warm s,xband receiver has electronic gain variations (mainly related to temperature).

2d crosses on continuum sources are used to measure the system performance (tsys,gain,sefd,beam width, pointing error).
2d Gauss fits are made to the data. The fit includes:
If the gain changes during the 2 or 3 minute cross, then the fit has a harder time fitting the baseline (using the single Tsys value and the ramp in elevation).
To improve the fitting (especially for weak sources):

This page shows the improvements in fitting using the linear baseline removal. The a4003 xband crosses on 3C286 (5.2 Jy) were used for the comparison.

Movies were also made of the 2d crosses with the fits over plotted:

8219.avi
8363.avi
8505.avi
8647.avi
8789.avi
8931.avi
9073.avi

processing: x101/230303/mkmovie.pro



The data:


The fits:

    The plots compare the two fitting procedures (.ps) (.pdf)

SUMMARY:


processing:  x101/230303/a4003_proc.pro


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