Characterization of a Low-Frequency Radio Astronomy Prototype Array in Western Australia
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We report characterization results for an engineering prototype of a next-generation low-frequency radio astronomy array. This prototype, which we refer to as the Aperture Array Verification System 0.5 (AAVS0.5), is a sparse pseudo-random array of 16 log-periodic antennas designed for 70-450 MHz. It is co-located with the Murchison Widefield Array (MWA) at the Murchison Radioastronomy Observatory (MRO) near the Australian Square Kilometre Array (SKA) core site. We characterize the AAVS0.5 using two methods: in-situ radio interferometry with astronomical sources and an engineering approach based on detailed full-wave simulation. In-situ measurement of the small prototype array is challenging due to the dominance of the Galactic noise and the relatively weaker calibration sources easily accessible in the southern sky. The MWA, with its 128 "tiles" and up to 3 km baselines, enabled in-situ measurement via radio interferometry. We present array sensitivity and beam pattern characterization results and compare to detailed full-wave simulation. We discuss areas where differences between the two methods exist and offer possibilities for improvement. Our work demonstrates the value of the dual astronomy-simulation approach in upcoming SKA design work.
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Hall, Peter; Benthem, P.; Sutinjo, Adrian (2016)© 2016 IEEE.Aperture Array Verification System 1 (AAVS1) is a prototype and verification platform for SKA-Low, the low-frequency component of the international Square Kilometre Array (SKA) radio telescope to be built at ...
Hall, Peter; Benthem, P.; Sutinjo, Adrian (2016)Aperture Array Verification System 1 (AAVS1) is a prototype and verification platform for SKA-Low, the low-frequency component of the international Square Kilometre Array (SKA) radio telescope to be built at the remote, ...
Colegate, Timothy; Sutinjo, Adrian; Hall, Peter; Padhi, Shantanu; Wayth, Randall; Bij de Vaate, J; Crosse, Brian; Emrich, David; Faulkner, Patricia; Hurley-Walker, Natasha; de Lera Acedo, E.; Juswardy, Budi; Ravavi-Ghods, N.; Tingay, Steven; Williams, Andrew (2014)We present an in-situ antenna characterization method and results for a “low-frequency” radio astronomy engineering prototype array, characterized over the 75–300 MHz frequency range. The presence of multiple cosmic radio ...