[daip] CLCOR modification for XY-EW mounts

[Cormac Reynolds]

hi,

thanks for doing that so quickly. I updated this morning and it's
working fine. The help file states that only alt-az and equatorial
mounts are supported for opcode 'ANAX' - perhaps that should be
updated too.

regards,
Cormac.

On 31 August 2010 23:11, Eric Greisen <egreisen at nrao.edu> wrote:
> Cormac Reynolds wrote:
>>
>> hi,
>>
>> we have recently correlated data from the Hobart 26-m telescope. This
>> telescope has an XY-EW mount. Due to a software error the wrong axis
>> offset was used for the correlator model. CLCOR has an 'ANAX' option
>> to fix an axis offset error, but does not do the right thing for XY-EW
>> mounts (which it currently treats as ALTAZ). Actually, the fix for
>> XY-EW is rather similar to ALTAZ, but the delay/rate computation needs
>> a different component of the source direction vector.
>>
>> I modified a recent version of CLCOR to do the correct thing for XY-EW
>> mounts (mount type 3 in AIPS). It is attached to this message (renamed
>> CRCOR.FOR for test purposes). The changes are straightforward and
>> appear in lines 3477 - 3510 of the attached file. I've tested it on a
>> few experiments from the Curtin DiFX installation that were affected
>> by the model bug, and it appears to do the right thing. Would it be
>> possible to get this fix incorporated into a release version of AIPS?
>> I'd like to share it with other LBA users who were also affected by
>> the bug.
>
> I have installed your correction.  A MNJ after tonight should update the
> code.  Many thanks - things like this are beyond my ability to find and fix
> without help.
>
> Eric Greisen
>



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Cormac Reynolds
Phone: +61 8 9266 3785
Fax: +61 8 9266 9246
email: c.reynolds at curtin.edu.au
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