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Revisiting Hybrid Interferometry With Low-Frequency Radio Astronomy Arrays

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Authors
Sutinjo, Adrian
Ung, D.
Colegate, T.
Wayth, R.
Hall, Peter
Acedo, E.
Date
2017
Type
Journal Article

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Sutinjo, A. and Ung, D. and Colegate, T. and Wayth, R. and Hall, P. and Acedo, E. 2017. Revisiting Hybrid Interferometry With Low-Frequency Radio Astronomy Arrays. IEEE Transactions on Antennas and Propagation. 65 (8): pp. 3967-3975.
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Transactions on Antennas and Propagation
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Department of Electrical and Computer Engineering
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Abstract

Radio interferometry most commonly involves antennas or antenna arrays of identical design. The identical antenna assumption leads to a convenient and useful mathematical simplification resulting in a scalar problem. An interesting variant to this is a "hybrid" interferometer involving two designs. We encounter this in the characterization of low-frequency antenna/array prototypes using a homogenous low-frequency array telescope such as the Murchison Widefield Array (MWA). In this work, we present an interferometry equation that applies to hybrid antennas. The resulting equation involves vector inner products rather than scalar multiplications. We discuss physical interpretation and useful applications of this concept in the areas of sensitivity measurement and calibration of an antenna/array under test using a compact calibrator source.