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    Real-Time Calibration of the Murchison Widefield Array

    Access Status
    Fulltext not available
    Authors
    Mitchell, D.
    Greenhill, L.
    Wayth, Randall
    Sault, R.
    Lonsdale, C.
    Cappallo, R.
    Morales, M.
    Ord, Stephen
    Date
    2008
    Type
    Journal Article
    
    Metadata
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    Citation
    Mitchell, D. and Greenhill, L. and Wayth, R. and Sault, R. and Lonsdale, C. and Cappallo, R. and Morales, M. et al. 2008. Real-Time Calibration of the Murchison Widefield Array. IEEE Journal on Selected Topics in Signal Processing. 2 (5): pp. 707-717.
    Source Title
    IEEE Journal on Selected Topics in Signal Processing
    ISSN
    19324553
    URI
    http://hdl.handle.net/20.500.11937/14202
    Collection
    • Curtin Research Publications
    Abstract

    The interferometric technique known as peeling addresses many of the challenges faced when observing with low-frequency radio arrays, and is a promising tool for the associated calibration systems. We investigate a real-time peeling implementation for next-generation radio interferometers such as the Murchison widefield array (MWA). The MWA is being built in Australia and will observe the radio sky between 80 and 300 MHz. The data rate produced by the correlator is just over 19 GB/s (a few peta-bytes/day). It is impractical to store data generated at this rate, and software is currently being developed to calibrate and form images in real time. The software will run on-site on a high-throughput real-time computing cluster at several tera-flops, and a complete cycle of calibration and imaging will be completed every 8 s. Various properties of the implementation are investigated using simulated data. The algorithm is seen to work in the presence of strong galactic emission and with various ionospheric conditions. It is also shown to scale well as the number of antennas increases, which is essential for many upcoming instruments. Lessons from MWA pipeline development and processing of simulated data may be applied to future low-frequency fixed dipole arrays.

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