[daip] Question about the relation between DPFU and Poly in GC table

[Eric Greisen]

On 06/21/2019 02:44 AM, Cui Yuzhu wrote:
> Dear Eric,
> 
> Yes, as I change the NCOUNT, more parameters are shown.
> 
> For the relation between DPFU and Poly, I will wait for your further 
> comments.

The polynomial is an expression that computes a relative value as a 
function of elevation (or other possible "Y" parameters).  This is then 
scaled by a scalar number - the sensitivity in K/Jy.  The GC table 
contains in the gain curve column Nterms of the polynomial for each IF 
in a polarization and there is a second column for a second polarization 
(if present). Our subroutine TABGC combines the 2 polarizations into 
single variables.

I don't understand what you mean by change the order of these two 
parameters.  Surely Poly(elev) * DPFU is the same as DPFU * Poly(elev). 
I also do not understand "offset" in pages 2 and 3.  Perhaps the issue 
is not seeing all that is contained in the GC table.

Read $YPGNOT/APCAL.FOR subroutine GCVAL to see how the values in the GC 
table are used to compute a predicted gain for each antenna.

Eric Greisen