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Holographic Calibration of Phased Array Telescopes
Radio Science ( IF 1.6 ) Pub Date : 2021-04-15 , DOI: 10.1029/2020rs007171
U. Kiefner 1, 2 , R. B. Wayth 2 , D. B. Davidson 2 , M. Sokolowski 2
Affiliation  

In radio astronomy, holography is a commonly used technique to create an image of the electric field distribution in the aperture of a dish antenna. The image is used to detect imperfections in the reflector surface. Similarly, holography can be applied to phased array telescopes, in order to measure the complex gains of the receive paths of individual antennas. In this paper, a holographic technique is suggested to calibrate the digital beamformer of a phased array telescope. The effectiveness of the technique was demonstrated by applying it on data from the Engineering Development Array 2, one of the prototype stations of the low frequency component of the Square Kilometre Array. The calibration method is very quick and requires few resources. In contrast to holography for dish antennas, it works without a reference antenna. We demonstrate the utility of this technique for initial station commissioning and verification as well as for routine station calibration.

中文翻译:

相控阵望远镜的全息校准

在射电天文学中,全息术是在碟形天线孔径内创建电场分布图像的常用技术。该图像用于检测反射镜表面的瑕疵。类似地,全息术可以应用于相控阵望远镜,以便测量各个天线接收路径的复增益。在本文中,提出了一种全息技术来校准相控阵望远镜的数字波束形成器。该技术的有效性通过将其应用到来自工程开发阵列2的数据来证明,该数据是平方公里阵列低频分量的原型站之一。校准方法非常快捷,所需资源很少。与碟形天线的全息技术相比,它无需参考天线即可工作。
更新日期:2021-04-29
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