Roque Ian L V, Razavi-Ghods Nima, Carey Steven H, Ely John A, Handley Will, Magro Alessio, Chiello Riccardo, Huang Tian, Alexander P, Anstey D, Bernardi G, Bevins H T J, Cavillot J, Croukamp W, Cumner J, de Lera Acedo E, de Villiers D I L, Fialkov A, Gessey-Jones T, Gueuning Q, Josaitis A T, Kulkarni G, Leeney S A K, Maiolino R, Meerburg P D, Mittal S, Pagano M, Pegwal S, Pieterse C, Pritchard J R, Saxena A, Scheutwinkel K H, Scott P, Shen E, Sims P H, Smirnov O, Spinelli M, Zarb-Adami K
Cavendish Astrophysics, University of Cambridge, Cambridge, UK.
Kavli Institute for Cosmology, University of Cambridge, Cambridge, UK.
Exp Astron (Dordr). 2025;59(1):7. doi: 10.1007/s10686-024-09975-3. Epub 2025 Jan 17.
We detail the REACH radiometric system designed to enable measurements of the 21-cm neutral hydrogen line. Included is the radiometer architecture and end-to-end system simulations as well as a discussion of the challenges intrinsic to highly-calibratable system development. Following this, we share laboratory results based on the calculation of noise wave parameters utilising an over-constrained least squares approach. For five hours of integration on a custom-made source with comparable impedance to that of the antenna used in the field, we demonstrate a calibration RMSE of 80 mK. This paper therefore documents the state of the calibrator and data analysis in December 2022 in Cambridge before shipping to South Africa.
我们详细介绍了旨在实现对21厘米中性氢线进行测量的REACH辐射测量系统。内容包括辐射计架构和端到端系统模拟，以及对高度可校准系统开发所固有的挑战的讨论。在此之后，我们分享基于使用超定最小二乘法计算噪声波参数的实验室结果。对于在与现场使用的天线具有可比阻抗的定制源上进行的5小时积分，我们展示了80毫开尔文的校准均方根误差。因此，本文记录了校准器和数据分析在2022年12月于剑桥运往南非之前的状态。
