吴锋泉,许嘉钦,朱嘉聪,等. 宇宙黎明全天频谱实验研究进展[J]. 电波科学学报,2024,39(4):1-6. DOI: 10.12265/j.cjors.2024073
      引用本文: 吴锋泉,许嘉钦,朱嘉聪,等. 宇宙黎明全天频谱实验研究进展[J]. 电波科学学报,2024,39(4):1-6. DOI: 10.12265/j.cjors.2024073
      WU F Q, XU J Q, ZHU J C, et al. Progress of Cosmic Dawn global spectrum experiments[J]. Chinese journal of radio science,2024,39(4):1-6. (in Chinese). DOI: 10.12265/j.cjors.2024073
      Citation: WU F Q, XU J Q, ZHU J C, et al. Progress of Cosmic Dawn global spectrum experiments[J]. Chinese journal of radio science,2024,39(4):1-6. (in Chinese). DOI: 10.12265/j.cjors.2024073

      宇宙黎明全天频谱实验研究进展

      Progress of Cosmic Dawn global spectrum experiments

      • 摘要: 探索宇宙黑暗时代、黎明时代和再电离时代对于理解宇宙的演化具有重要意义,一直是天文学研究的一个重要方向。从2000年前后开始,人们尝试利用200 MHz以下的红移中性氢21 cm辐射对宇宙早期的演化进行探测,主要是两条路径,一种是利用大规模阵列对中性氢辐射进行三维成像或空间功率谱测量,另一种是通过单天线对21 cm中性氢全天平均频谱进行测量。后一种测量设备规模小,只需要单天线,但要求接收机具有高精度的校准能力。本文主要介绍近年来我们在国家天文台红柳峡观测站开展的全天频谱探测实验的进展情况,包括多种非频变天线设计、创新性的多通道交叉验证接收系统设计思想,以及初步的实验进展等,实验结果显示利用天线模拟器得到系统校准精度残差小于0.025 K,达到了自校准精度的国际水平。这些设备的研制和实验的开展将有力地推动我国未来的月球轨道或月基全天频谱探测项目。

         

        Abstract: Exploring the Dark Ages, Cosmic Dawn, and Cosmic Reionization is of great significance to understand the evolution of the Universe and has been an important research direction in astronomy. From around the year of 2000, people began to try to use 21 cm neutral hydrogen radiation below 200 MHz to detect the early evolution of the Universe, mainly in two ways, one is to use large-scale array for three-dimensional imaging of neutral hydrogen radiation, and the other is to measure the average power spectrum of 21cm neutral hydrogen through a single antenna. The latter type of measurement has a small equipment scale and only requires a single antenna, but requires the receiver to have a high-precision calibration capability. This paper mainly focuses on the experiments of global spectrum experiment conducted at Hongliuxia observation station of National Astronomical Observatories in Xinjiang in recent years, including a variety of frequency-independent antenna designs, innovative multi-channel cross-validation receiving system design, and preliminary experimental progress. The experimental results show that the residual error of system calibration accuracy obtained by antenna simulator is less than 0.025 K, which reaches the international level of self-calibration accuracy. The development of these devices and the implementation of experiments will strongly promote China’s future lunar orbit or lunar base global spectrum exploration project in China.

         

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