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L-band RFI Measurement and Mitigation at the NSRT Site
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(1 Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011;(2 University of Chinese Academy of Sciences, Beijing 100049)

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    摘要:

    近些年,南山台址内部各类电子设备不断引入,此过程忽视了有效的设备管理及电磁防护,且台址周边无线电业务增多,以致电波环境恶化。为改善台址电波环境,采用一种准实时电波环境测量方法测量分析了台址周边瞬态信号的影响;另外,为提高微弱信号检测能力,采用便携式电磁干扰测量系统和26m射电望远镜对台址主要干扰信号特征及来源进行测量分析。依据测量和分析结果,采用屏蔽及滤波技术对望远镜观测室内部主要干扰源进行电磁防护,并针对屏蔽工程的有效性进行测量评估,结果表明,采用的电磁屏蔽措施有效。另外,提出了初步南山无线电宁静区保护办法缓解台址外部电磁干扰。

    Abstract:

    Radio environment degrades significantly at Nan Shan 26 m Radio Telescope (NSRT) base due to new and upgraded electrical devices on-site and more establishment of surrounding radio communication services. How do we mitigate them effectively? Firstly, a quasi-real time Radio Frequency Interference (RFI) measurement method is employed for RFI detection and spectral analysis based on the layout for potential on-site interference areas and off-site radio communication services. Our investigation at the frequency bands for pulsar observations (1380--1700 MHz) indicates that transient interferences pose the greatest impact on observations. Then we use a portable RFI measurement system for interferences hunting at the NSRT, and the typical characteristics of interferences are analyzed. Secondly, based on the RFI characteristics, main interference sources in the observation room are shielded with shielding cabinets. The results from our shielding efficiency (SE) measurement and evaluation show that these methods work effectively. Furthermore, we propose a Radio Quiet Zone (RQZ) and the regulations for NSRT to mitigate off-site RFIs.

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LIU Qi, LIU Ye, CHEN Mao-zheng, WANG Yue, LIU Feng, YAN Hao, CAO Liang, SU Xiao-ming.[J].天文学报,2019,60(6):82-94.

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  • 收稿日期:2019-02-25
  • 最后修改日期:2019-06-11
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  • 在线发布日期: 2019-12-05
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