AIPS HELP file for CL2HF in 31DEC24
As of Thu Apr 18 0:52:50 2024
CL2HF: Convert CL table to HF table for Calc/Solve Use
INPUTS
INNAME Main input file (name).
INCLASS Main input file (class).
INSEQ 0.0 9999.0 Main input file (seq. #).
0 => highest
INDISK 0.0 9.0 Disk unit #. 0 => any
INVERS Input CL file version no.
IN2VERS CL table for phase cal.
SNVER SN table used
SUBARRAY Subarray number 0 -> 1
OUTVERS Output HF file version.
TIMERANG Time Range
BADDISK -1.0 1000.0 Disks to avoid for scratch.
INFILE Schedule/time tag file name.
APARM General parameters:
1=Time tag computation:
0 => CL table time,
rounded to integer sec.
1 => SN table time,
integer sec.
2 => use input table
of time tags.
3 => use input Mark III
schedule file.
4 => use LISTR listing.
2=Elev. angle cutoff.
Permitted values 1.0
to 10.0 degrees.
3=Integration time, integer
seconds. Default (0)
implies 4 seconds.
5=Where to get phases:
=0 => from UV data
>0 => from SN table
(Use APARM(5)>0 always!)
DPARM More parameters:
1 = # of channels used by
FRING; usually 14 if
end channels dropped;
0 implies all
2 = total number of channels;
default (0) 16 channels;
must be specified if not
16 and DPARM(1) > 0.
HELP SECTION
CL2HF
Type: Task
Use: CL2HF translates AIPS calibration (CL) and solution (SN) tables
to Haystack FRNGE (HF) tables. This task is intended to
transfer AIPS VLBI fringe fitting results to the Goddard
CALC/SOLVE package.
Adverbs:
INNAME......Main file name (name). Standard defaults.
INCLASS.....Main file name (class). Standard defaults.
INSEQ.......Main file name (seq. #). 0 => highest
INDISK......Disk drive # of image. 0 => any
INVERS......Input CL table version # containing the
residual solutions. Residual solutions are now
actually taken from the SN table.
IN2VERS.....Input CL table version # to use for the phase
cals.
SNVER.......Input SN table version # containing the residual
solutions from FRING/MBDLY.
OUTVERS.....Output HF extension file version #. 0=>make new
TIMERANG....The time range to work on. 0-> all
BADDISK.....This array contains the numbers of disks on which
it is desired that scratch files not be located.
BADDISK has no effect on input and output files.
INFILE......Name of the schedule file or time tag file to use
for determining the observation UTC time tags.
Only used if APARM(1) = 2, 3, or 4.
APARM.......General control parameters:
APARM(1)....Controls the time tag computation method
= 0, (default), use CL table time, rounded to
the nearest second.
= 1, use SN table time, rounded to the nearest
second.
= 2, use an input table of time tags, must
specify file name using INFILE adverb.
= 3, use input Mark III schedule file
and compute time tag ala Haystack
formula, must specify file name using
INFILE adverb.
= 4, use start/stop times from LISTR listing,
file name specified with INFILE.
APARM(2)....Sets the elevation angle cutoff, in degrees.
Source elevations less than APARM(2) will not
be processed. Minimum value is 1.0 degree.
APARM(3)....Correlator integration period, in correlator
(integer) seconds. Default (0) is 4 correlator
seconds. Will be multiplied by .983 to get
actual integration period. If the wrong value
is used here, the group delay SNR's will not
be correct.
APARM(5)....Determines where the residual phase should be
obtained.
= 0, Get phases from UV data set. This no longer
gives correct phases.
> 0, Get phases from the SN table. Use this
option always.
DPARM.......More general control parameters:
DPARM(1)/DPARM(2) - Parameters used to correct
the SNR's if channels were dropped in FRING'ing.
Enter 0, 0 if no channels were dropped. DPARM(1)
is the number of channels used by FRING. DPARM(2)
is the total number of channels. Use 14 16, for
example, if the end channels were dropped.
Defaults: DPARM(2) = 16, DPARM(1) = DPARM(2); i.e.
no effect on SNR's.
EXPLAIN SECTION
PROGRAM: CL2HF
DOCUMENTOR: Ed Fomalont, D. Gordon
MAINTINER: D. Gordon
RELATED PROGRAMS: FRING, MBDLY, CLCAL, HF2SV
PURPOSE
Program CL2HF converts station-based, center-of-earth referenced
quantities (single band (narrow band) delays, group (multi-band or
wide band) delays, phase delay rates, and fringe phases) to
baseline-based, Haystack frame quantities. The primary inputs to
CL2HF are a solution SN table (from FRING/MBDLY), a solution CL
calibration table (from FRING/MBDLY/CLCAL), a phase cal CL table,
and (optionally) an Ascii file from which to determine the UTC
reference time tags of each observation. The output is an HF table.
Each baseline for a source scan produces one row in the HF table.
The HF table can then be written in files outside of AIPS
with the correct directory tree format using the task HF2SV.
These can be further processed using the GSFC/USNO Mark IV
Calc/Solve analysis package and used for geodetic and/or
astrometric studies.
See the 'HELP ASTROMET' help file for a very detailed description
of the AIPS processing of astrometric and geodetic experiments
correlated on the VLBA Correlator.
INVERS: This must be the CL table which contains the solutions
from Fring fitting.
IN2VERS: This must be the CL table which contains the apriori
phase calibration information. This information is needed in
determing some CL2HF parameters.
SNVER: The SN table which contains the fringe fit solutions and which
was used to update the CL table now in INVERS. This is the SN table
created by MBDLY. CL2HF now gets the residual delays and rates from
this table.
APARM(1)/INFILE: These two are used together to control how the
reference UTC time tags are determined for each observation.
=> 0 The time tags will be the CL table times rounded to the
nearest second. INFILE is not used.
=> 1 The time tags will be the SN table times rounded to the
nearest second. INFILE is not used.
=> 2 The time tags will be taken from a user supplied Ascii
file, specified by INFILE. This file should contain the
year, month, day, hour, minute, second, and source name
for each scan in the experiment [ (6(I2,1X),A8) format].
The source name is optional, if given it MUST match the
observation (first 8 characters).
=> 3 The time tags will be computed using the Mark IV schedule file,
which must be specified by INFILE. Do not edit the schedule
file. Time tags will be at the scheduled midpoint of the
shortest duration on the particular scan.
=> 4 The time tags will be computed using the file produced with
task 'LISTR' with OPTYPE = 'SCAN'. INFILE gives the file
name. You MUST edit this file first and delete all lines
that do not have a source and timerange. Do not edit the
source/timerange lines though.
APARM(2): The elevation angle cutoff, in degrees. Lowest value
permitted is 1.0 degrees. Default is 1.0 degrees.
APARM(3): The correlator integration period, in correlator
(integer) seconds. The default (0) is 4 correlator
seconds. It will be multiplied by .983 to get the actual
integration period. If the wrong value is used here, the
group delay SNR's will not be correct. Look in the CQ
table if you don't know this value.
APARM(5): Determines where the residual phase will be obtained from.
Should match the use of APARM(5) in FRING or APARM(6) in
MBDLY, more or less (and until those defaults are changed
if ever).
=> 0 Get phases from the UV data set. Use when FRING was run
with APARM(5)=0, or when MBDLY run with APARM(6)=0.
=> >0 Get phases from the SN table. Use when FRING run with
APARM(5)>1.5, or when MBDLY run with APARM(6)=1.
USE APARM(5)=1 ALWAYS; value 0 no longer gets the correct
answers.
DPARM(1)/DPARM(2): Parameters used to correct the SNR's if channels
were dropped in FRING'ing. Enter 0 0 if no channels were
dropped. DPARM(1) should be the number of channels used by
FRING. DPARM(2) should be the total number of channels. Use
14 16, for example, if the end channels were dropped.
Defaults: DPARM(2) = 16, DPARM(1) = DPARM(2); i.e. no
effect on SNR's.
VERSION HISTORY:
19980811: GSFC version merged into system version
19980814: Correctly processes 4 digit dates
19990714: DPARM added to drop pixels from SNR computation
20040228: Get phases from the SN table.
20050427: Update and correct, drop FLAGVER.