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在月球背面进行低频射电天文观测的关键技术研究
纪奕才1,2, 赵博1, 方广有1,2, 平劲松3, 吴伟仁4, 宁远明4, 卢伟1,2, 周斌1
1.中国科学院电磁辐射与探测技术重点实验室 北京 100190;2.中国科学院大学 北京 100049;3.中国科学院国家天文台 北京 100012;4.探月与航天工程中心 北京 100037
摘要:
月球具有足够大的尺寸,能够有效地遮挡来自地球的低频电磁波干扰,因此月球背面是进行低频射电天文观测的最佳场所。本文论述了利用低频射电频谱仪在月球背面进行空间低频射电天文观测的意义,给出了低频射电频谱仪工作原理、科学探测目标和系统组成。研究了低频射电频谱仪的设计,并采用低频射电频谱仪对北京中关村地区空中低频电磁波辐射频谱进行了试验探测,结果表明:低频射电频谱仪能够清晰地探测到 0.1~40 MHz 频带内的广播电台及授时台等发射的低频电磁波信号。
关键词:  射电天文;低频射电频谱仪;月球背面;太阳爆发
DOI:10.15982/j.issn.2095-7777.2017.02.008
分类号:P161
基金项目:
Key Technologies of Very Low Frequency Radio Observations on the Lunar Far-Side
JI Yicai1,2, ZHAO Bo1, FANG Guangyou1,2, PING Jinsong3, WU Weiren4, NING Yuanming4, LU Wei1,2, ZHOU Bin1
1.Key Laboratory of Electromagnetic Radiation and Sensing Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;4.Lunar Exploration and Space Program Center, Beijing 100037, China
Abstract:
The Moon has a large size,which can effectively block the low-frequency electromagnetic interference from the Earth,so the lunar far-side is the best place for low-frequency radio astronomical observation. In this paper,the significance of using a very low frequency radio spectrometer(VLFRS)for the low frequency radio astronomical observation on the back of the moon is discussed. And the goals,as well as the basic principles,design,composition and achievements of the VLFRS are described. Finally,experiments on the radiation spectrum of low frequency electromagnetic wave in Zhongguancun area,Beijing are analyzed. The results show that the low frequency radio signals in the 0.1~40 MHz band, which are emitted by the radio stations and the time-service centers, can be clearly detected by the VLFRS.
Key words:  radio astronomical observation;very low frequency radio spectrometer;lunar far side;Solar burst