Characterization of a Low-Frequency Radio Astronomy Prototype Array in Western Australia

Characterization of a Low-Frequency Radio Astronomy Prototype Array in Western Australia
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西澳大利亚低频射电天文学原型阵列的表征

DOI:
10.1109/tap.2015.2487504
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发表时间:
2015
影响因子:
5.7
通讯作者:
J. B. D. Vaate
J. B. D. Vaate
中科院分区:
计算机科学2区
文献类型:
--
作者:
A. Sutinjo;T. Colegate;R. Wayth;P. Hall;E. D. L. Acedo;T. Booler;A. Faulkner;Lu Feng;N. Hurley;B. Juswardy;S. Padhi;N. Razavi;M. Sokołowski;S. Tingay;J. B. D. Vaate

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我们报告的下一代低频射电天文阵列的工程原型的表征结果。这个原型,我们称之为孔径阵列验证系统0.5(AAVS0.5),是一个稀疏的伪随机阵列的16个对数周期天线设计为70-450兆赫。它与Murchison宽场阵列(MWA)位于Murchison射电天文台(MRO),靠近澳大利亚平方公里阵列(SKA)核心站点。我们使用两种方法表征AAVS0.5:天文源的原位无线电干涉测量和基于详细全波模拟的工程方法。由于银河噪声的主导地位和南部天空中容易获得的相对较弱的校准源,对小型原型阵列进行原位测量具有挑战性。MWA有128个“瓦片”和长达3公里的基线,能够通过无线电干涉测量进行现场测量。我们目前的阵列灵敏度和波束方向图表征结果和详细的全波模拟比较。我们讨论了两种方法之间存在差异的地方,并提供了改进的可能性。我们的工作证明了双重天文模拟方法在即将到来的SKA设计工作中的价值。
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 pseudorandom array of 16 log-periodic antennas designed for 70-450 MHz. It is colocated 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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发表时间: 2012
期刊: --
影响因子: --
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发表时间: 2013-08-01
影响因子: 6.5
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