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    Understanding instrumental Stokes leakage in Murchison Widefield Array polarimetry

    258853.pdf (691.4Kb)
    Access Status
    Open access
    Authors
    Sutinjo, Adrian
    O'Sullivan, J.
    Lenc, E.
    Wayth, Randall
    Padhi, S.
    Hall, Peter
    Tingay, Steven
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Sutinjo, A. and O'Sullivan, J. and Lenc, E. and Wayth, R. and Padhi, S. and Hall, P. and Tingay, S. 2015. Understanding instrumental Stokes leakage in Murchison Widefield Array polarimetry. Radio Science. 50 (1): pp. 52-65.
    Source Title
    Radio Science
    DOI
    10.1002/2014RS005517
    ISSN
    0048-6604
    School
    Department of Electrical and Computer Engineering
    Remarks

    This is the peer reviewed version of the following article: Sutinjo, A. and O'Sullivan, J. and Lenc, E. and Wayth, R. and Padhi, S. and Hall, P. and Tingay, S. 2015. Understanding instrumental Stokes leakage in Murchison Widefield Array polarimetry. Radio Science. 50 (1): pp. 52-65, which has been published in final form at 10.1002/2014RS005517. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving at http://olabout.wiley.com/WileyCDA/Section/id-828039.html

    URI
    http://hdl.handle.net/20.500.11937/60364
    Collection
    • Curtin Research Publications
    Abstract

    This paper offers an electromagnetic, more specifically array theory, perspective on understanding strong instrumental polarization effects for planar low-frequency "aperture arrays" with the Murchison Widefield Array (MWA) as an example. A long-standing issue that has been seen here is significant instrumental Stokes leakage after calibration, particularly in Stokes Q at high frequencies. A simple model that accounts for interelement mutual coupling is presented which explains the prominence of Q leakage seen when the array is scanned away from zenith in the principal planes. On these planes, the model predicts current imbalance in the X (E-W) and Y (N-S) dipoles and hence the Q leakage. Although helpful in concept, we find that this model is inadequate to explain the full details of the observation data. This finding motivates further experimentation with more rigorous models that account for both mutual coupling and embedded element patterns. Two more rigorous models are discussed: the "full" and "average" embedded element patterns. The viability of the full model is demonstrated by simulating current MWA practice of using a Hertzian dipole model as a Jones matrix estimate. We find that these results replicate the observed Q leakage to approximately 2 to 5%. Finally, we offer more direct indication for the level of improvement expected from upgrading the Jones matrix estimate with more rigorous models. Using the average embedded pattern as an estimate for the full model, we find that Q leakage of a few percent is achievable.

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