Calibrating and Imaging RR and LL separately

CASA Modification Request http://www.mrao.cam.ac.uk/surveys/6C 6C108, November 2007



1. Introduction

The present casa requirement, that all intended Stokes parameters must be available for a data point in order to calibrate or image the data, is too restrictive. For example, if one polarization of an antenna is bad, the other polarization cannot be calibrated or imaged. See [https://bugs.aoc.nrao.edu/browse/CAS-348][JIRA Ticket CAS-348]]. Also, it is desirable to be able to image the parallel hands independently (e.g. RR, LL, XX, YY) even when all products are present. See CAS-286.

2. Background

3. Requirements

The restriction of how flags are stored or interpreted should be changed so that the processing of a data base, with missing data for one polarization, should not ignore the other polarization, at least for basic calibration and imaging.

[BG] Only imaging is high priority, calibration can be deferred if we get into time trouble.

4. Design

Will provide access to RR and LL via stokes parameter ...instead of I it should be RR or XX.

Its done and is available in mosaic, clean and invert. new possibilities are RR, XX, LL, YY, RRLL, XXYY, QU

please test it out and file jira tickets for issues found

5. Deployment Checklist

6. Test Plan

6.1 Internal Testing

6.2 Sponsor Testing

Easy to test once implemented.

6.3 Integration/Regression Tests

6.4 Testing for Scientific Validity

Can be tested by imaging a data base with various stokes parameters flagged.


Signatures

APPROVED: I acknowledge that my request is fully contained in this MR, and if the CASA development group delivers exactly what I specified, I will be happy.

ACCEPTED: I acknowledge that I have validated the completed code according to the acceptance tests, and I am happy with the results.

Written - - - - -
Checked - - - - -
Approved by Scientific Sponsor - - - - -
Accepted/Delivered by Sponsor - - - - -

Symbols:
  • Use %X% if MR is not complete (will display ALERT!)
  • Use %Y% if MR iscomplete (will display DONE)


Discussion Area

-- NicoleRadziwill - 30 Oct 2007

-- EdFomalont - 01 Nov 2007

-- EdFomalont - 05 Nov 2007

-- EdFomalont - 05 Nov 2007
Topic revision: r8 - 2008-01-22, KumarGolap
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