Revisiting Hybrid Interferometry with Low-Frequency Radio Astronomy Arrays
arXiv:1705.08109 · doi:10.1109/TAP.2017.2710206
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.
arXiv comment8 pages. IEEE Trans. Antennas. Propagat., accepted, 23 May 2017
References in corpus (9)
- LOFAR: The LOw-Frequency ARray
- The Murchison Widefield Array: the Square Kilometre Array Precursor at low radio frequencies
- The Murchison Widefield Array: Design Overview
- Revisiting the radio interferometer measurement equation. I. A full-sky Jones formalism
- SKALA, a log-periodic array antenna for the SKA-low instrument: design, simulations, tests and system considerations
- Understanding Instrumental Stokes Leakage in Murchison Widefield Array Polarimetry
- Characterization of a Low-Frequency Radio Astronomy Prototype Array in Western Australia
- The use of the Long Baseline Array in Australia for precise geodesy and absolute astrometry
- Antenna array characterization via radio interferometry observation of astronomical sources