[daip] UVCON problem
Niruj Mohan Ramanujam
mohan at strw.leidenuniv.nl
Wed Mar 10 08:23:16 EST 2010
Hi,
I am sending this again with the huge pdf file converted to a smaller jpg
image.
regards
Niruj
>
>
> Hi,
>
> I am trying to create a uv dataset from an external image using UVCON and the
> result didnt seem sensible. Hence I made an image which is a single point
> source (in one pixel) with noise and that has problems too. In summary
>
> I have attached the input antenna file, UVCON input, the input image, and the
> UVPL outputm which is obviously crazy.
>
> 1. If i run UVCON with a SMODEL =1,0, it runs perfectly well and gives me
> sensible uv data
> 2. If I input the image, even if the flux is only in one pixel, and i changed
> the cdelt to 0.1", with the uv data resolution being >6", I still get very
> strange uv data.
>
> Can you please let me know if I am doing something wrong or is there a bug ?
>
> regards
> Niruj
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36
52.0 5.0 0
1.0 1.0
;
; lofar core stations (LBA)
;
; CS001
-160 -586 0 40 0.5 290 0 0
; CS002
-20 -169 0 40 0.5 290 0 0
; CS003
-105 -80 0 40 0.5 290 0 0
; CS004
-110 -254 0 40 0.5 290 0 0
; CS005
18 -289 0 40 0.5 290 0 0
; CS006
100 -209 0 40 0.5 290 0 0
; CS007
60 -124 0 40 0.5 290 0 0
; CS017
468 -88 0 40 0.5 290 0 0
; CS021
-486 107 0 40 0.5 290 0 0
; CS024
310 -946 0 40 0.5 290 0 0
; CS026
841 -47 0 40 0.5 290 0 0
; CS030
-600 615 0 40 0.5 290 0 0
; CS032
-682 -478 0 40 0.5 290 0 0
; CS101
728 658 0 40 0.5 290 0 0
; CS201
855 -448 0 40 0.5 290 0 0
; CS301
-129 -1206 0 40 0.5 290 0 0
; CS401
-956 -284 0 40 0.5 290 0 0
; CS501
-310 1066 0 40 0.5 290 0 0
;
; remote stations
;
; CS103
1 1998 -63 0 40 0.5 290 0 0
; RS104
1 3955 3048 0 40 0.5 290 0 0
; RS106
1 7832 -4573 0 40 0.5 290 0 0
; RS205
1 1906 -5626 0 40 0.5 290 0 0
; RS208
1 3866 -27444 0 40 0.5 290 0 0
; RS210
1 -3770 -68540 0 40 0.5 290 0 0
; CS302
1 -1374 -1708 0 40 0.5 290 0 0
; RS306
1 -8480 -3115 0 40 0.5 290 0 0
; RS307
1 -12469 -12927 0 40 0.5 290 0 0
; RS310
1 -48745 -21252 0 40 0.5 290 0 0
; RS404
1 -4245 1248 0 40 0.5 290 0 0
; RS406
1 -8266 11110 0 40 0.5 290 0 0
; RS407
1 -6445 18748 0 40 0.5 290 0 0
; RS409
1 -36980 9820 0 40 0.5 290 0 0
; RS410
1 -70000 7700 0 40 0.5 290 0 0
; RS503
1 -1319 2973 0 40 0.5 290 0 0
; RS508
1 4839 36166 0 40 0.5 290 0 0
; RS509
1 -6773 54658 0 40 0.5 290 0 0
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>inp uvcon
AIPS 1: UVCON Generates UV data for a given array and model
AIPS 1: Adverbs Values Comments
AIPS 1: ----------------------------------------------------------------
AIPS 1: INFILE '/home/mohan/LOFAR2010' Antenna location file name
AIPS 1: IN2FILE *all ' ' TSYS and Efficiency
AIPS 1: BLANK=>INFILE's data are used
AIPS 1: for TSYS and Efficiency
AIPS 1: OUTFILE *all ' ' Antenna location file name
AIPS 1: Positions are in equatorial
AIPS 1: coordinate system.
AIPS 1: IN2NAME 'PT SRC' Model image name (name)
AIPS 1: The both dimensions of the
AIPS 1: model must be 2**N pixels
AIPS 1: IN2CLASS 'IMAP' Model image name (class)
AIPS 1: IN2SEQ 1 Model image name (seq. #)
AIPS 1: IN2DISK 1 Model image disk unit #
AIPS 1: INVERS 0 CC file version #.
AIPS 1: OUTNAME 'PT SRC' Output UV file name (name)
AIPS 1: OUTCLASS ' ' Output UV file name (class)
AIPS 1: OUTSEQ 0 Output UV file name (seq. #)
AIPS 1: OUTDISK 1 Output UV file disk unit #.
AIPS 1: NMAPS 1 No. maps to use for model.
AIPS 1: BCOMP *all 0 First CLEAN comp to sub.
AIPS 1: 1 per field. 0 => 1
AIPS 1: NCOMP *all 0 Last CLEAN comp to sub.
AIPS 1: to use (0 => all)
AIPS 1: FLUX 0 Lowest CC component used.
AIPS 1: CMETHOD 'DFT' Modeling method:
AIPS 1: 'DFT','GRID'; ' '=>DFT
AIPS 1: CMODEL 'IMAG' Model type: 'COMP','IMAG'
AIPS 1: ' ' => 'COMP' => CC compon
ents
AIPS 1: 'IMAG' => image
AIPS 1: FACTOR 0 Factor times model fluxes.
AIPS 1: 0 => 1
AIPS 1: SMODEL *all 0 Source model, 1=flux,2=x,3=y
AIPS 1: See 'explain'.
AIPS 1: RASHIFT *all 0 Shift of the model center
AIPS 1: relatively of the initial
AIPS 1: RA=0, per field (asec)
AIPS 1: DECSHIFT *all 0 Shift of the model center
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: relatively of the initial
AIPS 1: declinat., given at APARM(3)
AIPS 1: per field (asec)
AIPS 1: APARM 0.12 0 Control information:
AIPS 1: 10 -1 1: Frequency of chan. 1, GHz
AIPS 1: 1 0 2: Wavelength of ch 1, cm
AIPS 1: 10 *rest 0 IF both .LE. 0 then
AIPS 1: wavelength = 0.1 cm
AIPS 1: 3: Source declination, deg
AIPS 1: 4: Min hour angle, hours
AIPS 1: 5: Max hour angle, hours
AIPS 1: The hour angles are for
AIPS 1: the given array center
AIPS 1: 6: Min antenna elevation, deg
AIPS 1: 7: Integration time, sec
AIPS 1: 0 => 1.D6
AIPS 1: to simmulate snapshot
AIPS 1: 8: Bandwidth(increment) of
AIPS 1: the freq. channel, MHz
AIPS 1: >=0 => it is increment to
AIPS 1: simulate multi chann. data
AIPS 1: =0 => Bandwidth = 1MHz
AIPS 1: <0 => one channel data to
AIPS 1: simulate multi frequency
AIPS 1: UV coverage
AIPS 1: 9: Number of freq. channels
AIPS 1: 0 => 1
AIPS 1: 10: Max blockage allowed
AIPS 1: 0 => 1 no blockage
AIPS 1: BPARM *all 0 Control information:
AIPS 1: 1: Multiplier of the calcul.
AIPS 1: noise. 0 => 1
AIPS 1: -1 => 0 (no noise)
AIPS 1: 2: Atmosphere noise at zenith
AIPS 1: in degrees.
AIPS 1: 3: RMS of pointing error,
AIPS 1: random among all antennas
AIPS 1: but constant in time,
AIPS 1: in arcsec
AIPS 1: If (BPARM(3).LT.0) then
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1:
AIPS 1: the phase and amplitude
AIPS 1: errors of each antenna
AIPS 1: are simulated instead
AIPS 1: of pointing error.
AIPS 1: ABS(BPARM(3)) is half
AIPS 1: range of homogeneously
AIPS 1: distributed phase, rad
AIPS 1:
AIPS 1: BPARM(4) is half
AIPS 1: range of homogeneously
AIPS 1: distributed natural LOG
AIPS 1: of factor to amplitude
AIPS 1:
AIPS 1: BPARM(5):
AIPS 1: 0 => only one (first)
AIPS 1: clean component is
AIPS 1: affected by the
AIPS 1: phase/amp noise
AIPS 1: 1 => all clean
AIPS 1: components are affected
AIPS 1:
AIPS 1: 4: global pointing error,
AIPS 1: constant in time for all
AIPS 1: antennas,
AIPS 1: in arcsec
AIPS 1: 5: RMS of pointing error,
AIPS 1: random among all antennas
AIPS 1: and in time,
AIPS 1: in arcsec
AIPS 1: 6: Type of the primary beam
AIPS 1: 1 => circular dish with
AIPS 1: the flat illumination
AIPS 1: 2 => illumination is 10dB
AIPS 1: down at the dish edge
AIPS 1: 3 => illumination is 15dB
AIPS 1: down at the dish edge
AIPS 1: The dish diameter is given
AIPS 1: at the INFILE (antenna 1)
AIPS 1: 4 => Gaussian beam with
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: given BMAJ, BMIN, BPA
AIPS 1: in degrees
AIPS 1: 5 => Gaussian beam with
AIPS 1: variable BMAJ, BPA
AIPS 1: depending on the time
AIPS 1: .GT.0 =>Multiply the model
AIPS 1: by the primary beam.
AIPS 1: 0 => Not multiply the
AIPS 1: model by the primary beam.
AIPS 1: 7: Time tolerance, in minutes
AIPS 1: 0 => 1
AIPS 1: If the difference of the
AIPS 1: current and previous time
AIPS 1: is < the time tolerance,
AIPS 1: the pointing error or the
AIPS 1: phase of the antenna or
AIPS 1: primary beam parameters
AIPS 1: are not changed
AIPS 1: 8: Shift the UV data by
AIPS 1: RASHIFT, DECSHIFT?
AIPS 1: 0 => yes shift
AIPS 1: 1 => no shift
AIPS 1: 9: Range of the primary beam
AIPS 1: 0 => 2.5
AIPS 1: 10: If OUTFILE.NE.BLANK then
AIPS 1: 0 => calculate OUTFILE and
AIPS 1: exit
AIPS 1: 1 => calculate OUTFILE and
AIPS 1: carry out the rest of
AIPS 1: job
AIPS 1: CPARM *all 0 Frequencies of the group(IFs)
AIPS 1: begins
AIPS 1: 1: Number of the groups (IFs)
AIPS 1: 2-10 Frequency of group(IFs)
AIPS 1: begins in MHz
AIPS 1: BMAJ 0 FWHM major axis of the
AIPS 1: Gaussian primary beam, degree
AIPS 1: See help for the variable
AIPS 1: primary beam (BPARM(6)=5)
AIPS 1: BMIN 0 FWHM minor axis of the
AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
#
AIPS 1: gaussian primary beam, degree
AIPS 1: BPA 0 Position angle of Gaussian
AIPS 1: primary beam, degree
AIPS 1: DO3DIMAG -1 1 => use W term calculating
AIPS 1: visibilities (only if
AIPS 1: CMETHOD='DFT', and
AIPS 1: CMODEL ='COMP')
AIPS 1: 0 => no W term calculating
AIPS 1: visibilities
>
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