[daip] PCAL and ORI- error
Andy Biggs
abiggs at eso.org
Tue Mar 13 04:28:04 EDT 2012
Hi Eric. Thanks - I've rerun PCAL and SPLIT and both work fine now.
Andy
On 12 Mar 2012, at 23:45, Eric Greisen wrote:
> Andy Biggs wrote:
>> Hi there. I'm reducing some 22-GHz VLBA + EB data and need to calibrate the D-terms. I can use LPCAL and that seems to work quite nicely, but the leakage is quite high on EB, OV and MK - the last two agree very nicely with values published in VLBA scientific memo 30 so I definitely believe them. For LCP of OV they approach 15% so I don't think I should be using the linearised model. I've therefore tried PCAL as that offers the 'ORI-' option - this is supposed to be better when dealing with high levels of leakage. Using OPTY='RAPR' I get similar results to LPCAL so I think I've at least got this task working correctly. If I try OPTY='ORI-' it seems to work fine, but any attempt to then use the results via e.g. SPLIT, ends in the following error message:
>> 1 5 12-MAR-2012 20:43:39 SPLIT Task SPLIT (release of 31DEC12) begins
>> 1 2 12-MAR-2012 20:43:39 SPLIT You are using a non-standard program
>> 1 2 12-MAR-2012 20:43:39 SPLIT Doing subarray 1
>> 1 3 12-MAR-2012 20:43:39 SPLIT UVGET: Using flag table version 3 to edit data
>> 1 2 12-MAR-2012 20:43:59 SPLIT Create 0218+357 .SPLIT . 1 (UV) on disk 3 cno 202
>> pc016987 AIPS (31DEC12) 218 12-MAR-2012 20:52:07 Page 2
>> Pops Prior Date Time Task Messages for user 218
>> 1 3 12-MAR-2012 20:43:59 SPLIT Applying CL Table version 13
>> 1 7 12-MAR-2012 20:43:59 SPLIT ZCLOSE: DOES NOT PERFORM LINE PRINTER CLOSES AS OF 15JAN91
>> 1 6 12-MAR-2012 20:43:59 SPLIT TABINI: I/O ERROR FROM ISTAB ON AN
>> 1 6 12-MAR-2012 20:43:59 SPLIT ANINI: ERROR 3 FROM TABINI OPCODE = READ
>> 1 7 12-MAR-2012 20:43:59 SPLIT ANINI: ERROR 3 INITIALIZING ANTENNA TABLE FOR READ
>> 1 8 12-MAR-2012 20:43:59 SPLIT PDRGET: ERROR 3 OPEN-FOR-WRITE AN FILE
>> 1 4 12-MAR-2012 20:43:59 SPLIT Destroyed 1 extension files of type NX
>> 1 4 12-MAR-2012 20:44:00 SPLIT Destroyed UV image file: catno= 202 disk= 3
>> 1 6 12-MAR-2012 20:44:00 SPLIT PROBLEM WITH SOURCE: 0218+357
>> 1 9 12-MAR-2012 20:44:00 SPLIT FAILED TO SELECT VALID DATA
>> 1 3 12-MAR-2012 20:44:00 SPLIT Purports to die of UNNATURAL causes
>> 1 5 12-MAR-2012 20:44:00 SPLIT pc016987 31DEC12 TST: Cpu= 3.9 Real= 21 IO= 9
>> I do not get this message if I run PCAL using the RAPR option - that seems to work fine. I'm running an absolutely up-to-date version of AIPS 31DEC12.
>> By the way, I'm also confused about what DOPOL=2 does. This applies the second-order corrections from the linear model, but that name implies that this solution doesn't have second-order terms. Or is this referring to the correction of the parallel hand visibilities?
>>
> I have found an error where a 512-word buffer should have been and instead a local 16 word variable was used in initializing the pol cal for ORI-. DOPOL=2,3 is checked only for the special VLBI mode not offered by PCAL. That mode can be applied only to cross-hands (DOPOL=1 or 6) or to all 4 with DOPOL=2,3,7,8. ORI is applied to all 4 like it or not.
>
> I will correct this code now and re-link lots of things. Can you try it tomorrow?
>
> Thanks
>
> Eric
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