1. obs2script
Bryan Butler

2. EVLA M&C Transition Software CDR
Introduction
VLA users expressed a desire to continue to submit OBSERVE files during transition (transmitted via the Visiting Committee and Users Committee)
The EVLA antennas are controlled via a jython script
We need a program to convert old OBSERVE files to the new jython scripts
This is “obs2script”
2006Dec05/06
EVLA M&C Transition Software CDR

3. EVLA M&C Transition Software CDR
Place in the System
2006Dec05/06
EVLA M&C Transition Software CDR

4. EVLA M&C Transition Software CDR
Example
VLA OBSERVE file “cards”:
C XX A
//DS
//LO
//FISF
Resultant EVLA jython script segment:
loif0 = LoIfSetup("10GHz", , )
source3 = Source( , )
source3.setName(" ")
subarray.setSource(source3)
subarray.execute( / / /86400)
2006Dec05/06
EVLA M&C Transition Software CDR

5. EVLA M&C Transition Software CDR
Structure
obs2script is written as a C program - major components:
Driver (“main”)
OBSERVE file card parsing routines
Jython script file printing routines
“ephemeris” routines (in large part copied directly from Modcomp FORTRAN and hand-converted to C, for compatibility), for frequency setup and doppler tracking
SLA library routines (for converting between coordinates of date or B1950 to J2000 and for some timing)
There are also raw jython functions, for standard observing modes (fast-switching, reference pointing, rasters, focus) which are included as needed in the jython script (via execfile())
2006Dec05/06
EVLA M&C Transition Software CDR

6. Supported Modes and Modifiers
obs2script currently supports the following observing modes and modifiers:
Normal continuum, spectral line, polarization
Single dish pointing
Interferometric pointing
Reference pointing determination and application (primary and secondary)
TIPping
Focus
Planets (but not supported in the Executor currently)
Antenna wrap and over-the-top specification
Rasters (az/el or ra/dec)
Phased-array
DEF blocks, REW and BAC cards
To be completed:
Delay
Solar
Correlator specification
2006Dec05/06
EVLA M&C Transition Software CDR

7. EVLA M&C Transition Software CDR
The Future
OBSERVE
file
model2obs
jython
script
obs2script
Executor
Next
EVLA
OPT
EVLA SB
model
OBSERVE
file
jobserve
jython
script
obs2script
Executor
New
OBSERVE
file
jobserve
Modcomp
Old
Final
EVLA SB
model
EVLA
OPT
script
model2script
Executor
2006Dec05/06
EVLA M&C Transition Software CDR