Foreground removal and 21 cm signal extraction from Cosmic Dawn

Zhongguo kexue. Wulixue Lixue Tianwenxue 2026 Open access

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Authors: Jiajun Zhang, Haoran Li, Kaifeng Yu, Le Zhang, Shulei Ni, Feng Shi, Donghui Quan, Furen Deng, Meng Zhou, Tianyang Liu, Zitong Wang, MA Xiaofan
+3 more WANG Xin, Yidong Xu, Chen Xuelei
DOI: 10.1360/sspma-2026-0025
Cited by: 0
References: 81

Abstract

探测宇宙黎明时期的21厘米全天平均谱是揭示早期宇宙演化的关键手段，但面临银河系前景辐射强于目标信号4-5个量级、仪器系统效应复杂等挑战。鸿蒙计划通过部署绕月卫星平台（30-120 MHz高频观测），突破地面观测的电离层干扰与射频污染限制，实现全天区覆盖。近年来，研究团队针对前景减除和信号提取问题提出了一系列创新方法，具体研究了波束卷积效应、月球影响、天线多色性等问题，并对宇宙黎明21厘米全天频谱仿真信号进行了信号提取实验。实验结果表面，鸿蒙计划需要累计10天的有效积分观测时间，可达到提取21厘米信号的要求。

Fields of Study & Subjects

Radio Astronomy Observations and Technology Cosmology and Gravitation Theories Astrophysics and Star Formation Studies

Publication details

Journal / source
Zhongguo kexue. Wulixue Lixue Tianwenxue
Volume
56
Issue
10
Pages
109504–109504
Publication date
6 March 2026
Language
EN