Beam modelling accuracy for flux calibration of phased array radio telescopes

被引：0
|
作者：
Wijnholds, Stefan J. [1 ]
Labate, Maria Grazia [2 ]
Davidson, David B. [3 ]
Bolli, Pietro [4 ]
机构：
[1] ASTRON, Innovat & Syst, Dwingeloo, Netherlands
[2] SKA Observ, Project Engn, Manchester, Lancs, England
[3] Curtin Univ, ICRAR, Perth, WA, Australia
[4] INAF, Arcetri Astrophys Observ, Florence, Italy
来源：
2023 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED APPLICATIONS, ICEAA | 2023年
关键词：
phased arrays; gain calibration; radio astronomy; electromagnetic modelling; Square Kilometre Array;
D O I：
10.1109/ICEAA57318.2023.10297803
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The gain of radio telescopes is calibrated using well-known radio astronomical sources. Due to the limited number of suitable calibration sources, the angle between the directions towards the calibrator and towards the observed field can be as large as similar to 60 degrees. This poses an instrument characterization and modelling challenge for phased array radio telescopes like LOFAR and SKA, which are steered electronically, as the gain of the antennas varies over the sky. We derive a requirement on the accuracy of the instrument model and assess the impact of two simplified calculations of the main beam peak gain of the subarrays (stations) of the low-frequency receiving system of the SKA. We show that station beam peak gain modelling can be simplified by using the average EEP, while the isolated antenna pattern is an oversimplification.
引用
收藏
页码：408 / 413
页数：6
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