Revisiting Hybrid Interferometry with Low-Frequency Radio Astronomy Arrays

Autor:	Sutinjo, Adrian T., Ung, Daniel, Colegate, Tim M., Wayth, Randall B., Hall, Peter J., Acedo, Eloy de Lera
Rok vydání:	2017
Předmět:	Astrophysics - Instrumentation and Methods for Astrophysics
Druh dokumentu:	Working Paper
DOI:	10.1109/TAP.2017.2710206
Popis:	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. Comment: 8 pages. IEEE Trans. Antennas. Propagat., accepted, 23 May 2017
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1705.08109 Zobrazit plný text záznamu View this record from Arxiv