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Interoperability
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Working Documents
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To be completed.

Main Activities
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The activity on translating AIPS calibration tables (solution, bandpass, and calibration) to Casa calibration tables was continued. The earlier proof of concept utilities were consolidated into a single tool and a Casa task interface was added. The Casa task makes use of earlier work on also conducted for this activity - the unified Casa/ParselTongue environment.

The software has been tested and verified with VLA and WSRT data, and partially verified for EVN data. The latter being a slightly more complicated test case due to the interdependency between the FITS loader, the flag importer and the calibration transfer.

Problems / Issues
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Producing tables in conformance with the Casa calibration table specification is not adequate to ensure compatibility. It can be difficult to fully reverse engineer Casa's requirements for correct treatment of tables.

Future work
———–
This work will briefly be resumed in Q2 2011 for testing with the latest Casa release, and reporting.

Expected Milestones
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Report in Q2. Software finalisation in Q2.

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Fringe Fitting
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List of working documents
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Fringe Fitting in Casa design document.
Also Ian's report.

Main Activities
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Further to Ian's report, I have implemented a rate solver in Casa which uses the FFT method to estimate delay rates. I have implemented baseline stacking code, which exploits phase closure properties of visibilities to stack equivalent 'pseudo' baselines to gain sensitivity. This is most beneficial on homogeneous arrays which lack a big dish to boot strap.

Meetings attended
—————–
Socorro fringe fitting meeting, 26 January - 11 February.

Problems / Issues
—————–

A full, production quality, Casa implementation would require a significant number of man hours, which may not be available.

Forward Look
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The development of algorithms will continue until the end of April. Casa implementation will continue until later in the year.

Expected Milestones
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Python implementation, May 2011. Casa FFT Delay / rate solutions, Q2 2011. Baseline stacking and application of solutions Q3 2011.

Persons involved
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Bourke, Stewart primarily. Support from Moellenbrock, Kern, Brisken.