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Release of 22 Feb 1996

This is a slightly modified version of the SCHED that was released within NRAO in December 1995.

This version included a number of evolutionary changes made up to November 1995. In that month, the VLBA OBSERVE (GNOMES) project was cancelled and it became clear that SCHED had much more of a future than expected. Many changes, including addition of plotting and dwell time scheduling, along with massive changes in internal structure for both maintainability and for eventual Mark IV support, were made. Also the help file was renamed the manual, formated for LaTeX and html, and to a large degree, rewritten. It is now this document.

The evolutionary changes before November 1995 were:

• Add REMARK to valid parameters in source catalog. Someday, print it in the summary file. (1995 May 31)

• First parallactic angle was PA2, not PA1, in PRTSCH. Fixed. (1995 June 4)

• Added horizons. (1995 June 17)

• Warn if automatic tape allocation requested. (1995 June 26)

• Rewrite optimization mode routines for easier modification. (1995 June)

• Increase maximum number of setup files to 50. (1995 June 25)

• Make cover-like info in VLA observe file look like what VLA OBSERVE observe makes so observe will read it. (1995 July)

• Fix rounding of F6 numbers for VLA, since did wrong thing when negative. (1995 October 3)

• Change reference pointing at VLA from IA to IR mode. Also, only put pointing request in VLBA control files if this is not a DAR-only station (1995 October 4)

• Update some bits of VLA info in help file. A major review of the help file should be done soon. Also put the help file in HTML. (1995 October 4)

• SCHIN had FASTF instead of FASTFOR as per the documentation. Change to FASTFOR. (1995 October 30)

The big rewrite included:

• Added plotting.

• Added dwell time scheduling.

• Added new subroutines for setting up and reading KEYIN variables. It is now much easier to add and remove parameters. Also, the number of inputs for arrays is now sensitive to the parameter statements.

• Much restructuring of code.

• Can now write telescope output files when optimization used. Optimization much better integrated into program.

• Help file made into a manual and formated for LaTeX.

• Manual made convertable to html by latex2html.

• Reduced maximum stations and scans parameters. Some variables with both dimensions were added so this keeps the size down.

• Convert many time parameters to fractional days from radians inside program. Not visible to user.

• Allow in-line setup files much like the source and station catalogs.

• Setup files are now required for all projects.

• Allow a ``default'' station in setup files (eg for Mark II or experiment planning).

• Relative order of ``VLBA'' default station and any specific stations in a setup file no longer matters.

• SCHED no longer takes the number of channels from the main input file. This is set only in the setup file.

• The bandwidth is no longer required in the main file for observations using Doppler calculations -- it is obtained from the setup file. It can still be changed in the main file.

• The formats of the summary and sch files were changed somewhat.

• SUN proximity warnings no longer overwrite other comments.

• For dwell time scheduling, more general axis limits and slew rates were put in the station catalog. Parameter HALIM was removed.

• In the summary and sch files, scans below the horizon but above the slew limits are marked differently from scans below the slew limits

• Scan timing specification was enhanced. GAP was added to take the place of the usual use of PRESCAN. PRESCAN is now just a tape start offset. It can be negative for prestarting tapes. The changes are backward compatible

• SCHED internally calculates XYZ for stations if they are needed. Mainly used in u-v plotting.

• Put summary file output early enough in program that it is done and closed before plotting begins. It can then be examined during plotting.

• Now, when there is in-stream input such as tape initialization, source and station catalogs, line frequencies, or setup information, SCHED reads that input and then returns to reading input for the current scan. No scan initialization is done. Thus these in-stream inputs can go anywhere. The main use of this will probably be to put the cover information at the top of the file. Another use is to put in-stream setup information in the main file at the scan where it is first used. This is useful especially for test observations.

• Let OPMINANT and OPMINEL apply regardless of optimization. They are useful especially in planning.

• The TPRATE parameter was removed.

• Allow program restart from plotting input.

• Allow setups with different numbers of tracks. This can waste tape because the tape management will be done as if all scans used the maximum number of channels.

• Allow specification of schedule input file name from main input. This allows one-time inputs, such as the request to plot, to be made before sending SCHED off to get the schedule input.

• Add DEBUG which turns on some extra printing.

• VLABAND and VLABW were moved to the setup file.

• Added a toggle concept for many variables such as RECORD, TSYS, DOPPLER, etc. Now they are paired with a NO... (eg NORECORD) that turns them off.

• Added OPSTYPE=VLA for pure VLA observations. This helps tell SCHED not to worry about tape related stuff.

• Changed DOPCAL to DOPPLER to avoid the confusion with DO PCAL. Added NODOP to turn it off.

• Got latest SLALIB and updated a couple of places where there were changes. Also got email permission to use it.

• Add OVERWRIT to allow sched to overwrite old files if desired. This is not the default as a safety measure.

• Adding CSUB optimization mode. The optimizes sky coverage. It includes subarrays.

• Adding SUMITEM input to allow specification of what is in the summary file.

• Changed XY mount type to XYNS. Should add XYEW.

• When the station catalog is read, the position both in geodetic longitude, latitude, and elevation and in geocentric X,Y,Z are determined from the information provided. The catalog should contain one or both of the above coordinates. The conversion is accurate at the cm level for coordinates in WGS84.

• Added Station XYZ to summary listing.

• Allow vlba and vla defaults in TAPEINI section.