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Fringe stopping is available on an opt-in basis for any observation during the first observing semester of 2023. Users may request fringe stopping at the time of scheduling, or at any time prior to the start of the observation. There is no change to how observation data is delivered and no software changes are required to use it, apart from that you should not tell Birli to apply geometric corrections to a fringe-stopping observation. By default, Birli will detect whether an observation was made with fringe-stopping, and geometric corrections will not be run unless explicitly specified at the command line or selected in ASVO.

Fringe stopping is available for voltage-capture (VCS) observations. In this case, the voltage data files will have whole-sample delays applied to each RF channel and fractional delay metadata will be populated in the file headers. Voltage data files are also upgraded to allow for commensal research users accessing VCS data to selectively enable or disable fringe stopping after-the-fact, irrespective of the configuration requested for the original observation.

Implementation

A technical summary of the MWAX fringe stopping implementation will be published soon as part of the forthcoming MWAX paper, a detailed description of the design and validation will be published shortly thereafter.

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