[daip] Could you help me?
Rusen Lu
rslu at shao.ac.cn
Tue Oct 25 02:01:38 EDT 2005
Dear Professor,
I have a problem with APCAL in performing the amplitude calibration.
I want to compare the gain of using the system temperature with
that of using antenna temperature. But, I can not find the reason why
the results are different by these two ways.
I am attaching this email the parameters I chose (both without
correction for atmospheric opacity) and the respective external files read by ANTAB.
So, could you please do me a favor to give me some explanation on this?
Thanks in advance!
----------------------------
Rusen Lu
rslu at shao.ac.cn
Shanghai Astronomical Observatory
Chinese Academy of Sciences (CAS)
-------------- next part --------------
The parameters I chose in APCAL (using different TY & SN version for these twodifferent conditions) :
AIPS 1: APCAL Task to generate an amplitude calibration SN table
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INNAME 'CS07 ' Input UV file name (name)
AIPS 1: INCLASS 'UVSRT ' Input UV file name (class)
AIPS 1: INSEQ 1 Input UV file name (seq. #)
AIPS 1: INDISK 1 Input UV file disk unit #
AIPS 1:
AIPS 1: ANTENNAS 2 3 Antennas to calibrate
AIPS 1: 4 5 *rest 0
AIPS 1: SUBARRAY 0 Subarray 0 -> 1
AIPS 1: STOKES ' ' Stokes type ('R','L',' ')
AIPS 1: BIF 1 Start IF number
AIPS 1: EIF 4 End IF number
AIPS 1: FREQID -1 Freq. ID to calibrate
AIPS 1: SOURCES '1921-293 ' Sources to calibrate
AIPS 1: *rest ' '
AIPS 1: TIMERANG 1 11 Time range to calibrate
AIPS 1: 9 3 1 15
AIPS 1: 19 59
AIPS 1: TYVER 3 TY table version number.
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: GCVER 3 GC table version number.
AIPS 1: SNVER 4 Output SN table version.
AIPS 1: 0 -> highest unique
AIPS 1: OPCODE ' ' Opacity correction opcode:
AIPS 1: ' ' -> no opacity corr.
AIPS 1: 'LESQ','GRID','OPAC' ->
AIPS 1: opacity corr.
AIPS 1: APARM 1 *rest 0 Calibration parameters:
AIPS 1: (1) -> B factor (def. 1.0)
AIPS 1: Opacity parameters:
AIPS 1: (2) -> ZA limit (deg)
AIPS 1: (3) >=0 use spillover
AIPS 1: correction
AIPS 1: (4) > 0 use all FQ in
AIPS 1: opac. soln.
AIPS 1: (5) Limit to sec(z) plotted
AIPS 1: SOLINT 0 Solution interval (min)
AIPS 1: 0 -> use all data
AIPS 1: INVERS 0 WX table version number.
AIPS 1: 0 -> use text file
AIPS 1: INFILE *all ' ' Text file with weather info.
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: Must be ' ' if using WX
AIPS 1: table (INVERS).
AIPS 1: TRECVR *all 0 Receiver temperatures (K);
AIPS 1: in (R,L) pairs.
AIPS 1: TAU0 *all 0 Zenith opacities (per ant.)
AIPS 1: DOFIT *all 0 Fit type (per ant.)
AIPS 1: -1 -> no opacity correction
AIPS 1: 0 -> apply TRECVR only
AIPS 1: 1 -> solve for Trec using
AIPS 1: fitting method spec.
AIPS 1: in OPCODE; then apply
AIPS 1: PRTLEV 0 Print level
AIPS 1: DOTV 1 TV selection (<0 -> PL file)
AIPS 1: LTYPE 3 Plot labeling
AIPS 1: GRCHAN 0 TV Graphics channel to use
----------------------------------------------------------------------------
The external file (Tant& SRC/TSYS) read by ANTAB
!The CONTROL group
CONTROL
INDEX = 'R1:4','L1:4'
TANT timeoff = 0.0 KITTPEAK FT = 1.0/
107 11:12.000 0.153 0.185!
107 11:30.000 0.194 0.224!
107 12:00.000 0.182 0.201!
107 12:30.000 0.185 0.199!
107 12:40.000 0.191 0.232!
107 13:00.000 0.193 0.218!
107 13:30.000 0.193 0.217!
107 14:00.000 0.177 0.216!
107 14:10.000 0.189 0.220!
107 14:40.000 0.165 0.217!
107 15:00.000 0.178 0.207!
107 15:10.000 0.191 0.213!
/
!The CONTROL group
CONTROL
INDEX = 'R1:4','L1:4'
! ----- Tsys information for KITTPEAK -----
TSYS SRC/SYS timeoff = 0.0 KITTPEAK FT = 1.0/
107 11:12.000 0.0006041 0.0006787!
107 11:30.000 0.0008034 0.0008626!
107 12:00.000 0.0007925 0.0008129!
107 12:30.000 0.0008298 0.0008279!
107 12:40.000 0.0008534 0.0009622!
107 13:00.000 0.0008808 0.0009232!
107 13:30.000 0.0008830 0.0009198!
107 14:00.000 0.0008006 0.0009055!
107 14:10.000 0.0008525 0.0009247!
107 14:40.000 0.0007428 0.0009090!
107 15:00.000 0.0007789 0.0008421!
107 15:10.000 0.0008306 0.0008586!
/
-----------------------------------------
The external file (Tsys) read by ANTAB
!The CONTROL group
CONTROL
INDEX = 'R1:4','L1:4'
! ----- Tsys information for KITTPEAK -----
TSYS timeoff = 0.0 KITTPEAK FT = 1.0/
107 11:12.000 253 273!
107 11:30.000 241 259!
107 12:00.000 230 247!
107 12:30.000 223 240!
107 12:40.000 224 242!
107 13:00.000 219 237!
107 13:30.000 218 236!
107 14:00.000 221 238!
107 14:10.000 221 239!
107 14:40.000 228 246!
107 15:00.000 229 248!
/
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