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    The Bias and Uncertainty of Redundant and Sky-based Calibration Under Realistic Sky and Telescope Conditions

    74715.pdf (1.131Mb)
    Access Status
    Open access
    Authors
    Joseph, R.
    Trott, Cathryn
    Wayth, Randall
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Joseph, R. and Trott, C. and Wayth, R. 2018. The Bias and Uncertainty of Redundant and Sky-based Calibration Under Realistic Sky and Telescope Conditions. Astronomical Journal. 156 (6): Article ID 285.
    Source Title
    Astronomical Journal
    DOI
    10.3847/1538-3881/aaec0b
    ISSN
    0004-6256
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This is an author-created, un-copy edited version of an article accepted for publication in Astronomical Journal. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/1538-3881/aaec0b

    URI
    http://hdl.handle.net/20.500.11937/74430
    Collection
    • Curtin Research Publications
    Abstract

    The advent of a new generation of low frequency interferometers has opened a direct window into the Epoch of Reionisation (EoR). However, key to a detection of the faint 21-cm signal, and reaching the sensitivity limits of these arrays, is a detailed understanding of the instruments and their calibration. In this work we use simulations to investigate the bias and uncertainty of redundancy based calibration. Specifically, we study the influence of the flux distribution of the radio sky and the impact of antenna position offsets on the complex calibration solutions. We find that the position offsets introduce a bias into the phase component of the calibration solutions. This phase bias increases with the distance between bright radio sources and the pointing center, and with the flux density of these sources. This is potentially problematic for redundant calibration on MWA observations of EoR fields 1 and 2. EoR field 0, however, lacks such sources. We also compared the simulations with theoretical estimates for the bias and uncertainty in sky model based calibration on incomplete sky models for the redundant antenna tiles in the MWA. Our results indicate that redundant calibration outperforms sky based calibration due to the high positional precision of the MWA antenna tiles.

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