杨铖,郝玉龙,刘文璐,等. FAST运行前后所处电磁环境特性研究[J]. 电波科学学报,2024,39(4):1-10. DOI: 10.12265/j.cjors.2024106
      引用本文: 杨铖,郝玉龙,刘文璐,等. FAST运行前后所处电磁环境特性研究[J]. 电波科学学报,2024,39(4):1-10. DOI: 10.12265/j.cjors.2024106
      YANG C, HAO Y L, LIU W L, et al. Research on electromagnetic environment before and after the operation of the FAST[J]. Chinese journal of radio science,2024,39(4):1-10. (in Chinese). DOI: 10.12265/j.cjors.2024106
      Citation: YANG C, HAO Y L, LIU W L, et al. Research on electromagnetic environment before and after the operation of the FAST[J]. Chinese journal of radio science,2024,39(4):1-10. (in Chinese). DOI: 10.12265/j.cjors.2024106

      FAST运行前后所处电磁环境特性研究

      Research on electromagnetic environment before and after the operation of the FAST

      • 摘要: 为掌握500 m口径球面射电望远镜(Five-hundred-meters Aperture Spherical radio Telescope, FAST)运行前后周边的电磁环境特性变化,针对FAST主要观测频段的电磁信号进行了观测。基于观测结果,分析了FAST周边电磁环境信号的分布特性:在FAST调试期间,主要以87~108 MHz频段广播信号、117.975~137 MHz航空移动信号、806~960 MHz固定移动信号为主,其中900~1 200 MHz频率占用度最高,达到1.8%。FAST运行后,在485~566 MHz、614~640 MHz频段新增广播信号,702~798 MHz频段新增了中国广电5G公众移动通信信号,806~960 MHz频段新增固定、移动信号。同时,受2G基站部署密度提升以及3G和4G信号的接入影响,1 710~1 930 MHz频率占用度显著提升,1 200~2 000 MHz频率占用度提升至6.78%。对比《500米口径球面射电望远镜(FAST)干扰保护要求》,信号谱功率通量密度未全部达到要求的阈值以下。上述观测与FAST调试运行同步进行,所测信号包括了FAST调试过程中测控、通信等信号,上述分析研究对改进FAST周边电磁环境和指导FAST运行具有重要的参考意义。

         

        Abstract: To understand the electromagnetic environment surrounding the Five-hundred-meters Aperture Spherical radio Telescope (FAST) before and after its operation, electromagnetic signals in the main observation frequency bands of FAST were observed using standard radio signal observation methods. Based on the observation results, the distribution characteristics of electromagnetic signals in the vicinity of FAST were analyzed as follows: during the commissioning phase of FAST, the dominant signals included broadcast signals in the 87 MHz to 108 MHz band, aeronautical mobile signals in the 117.975 MHz to 137 MHz band, and fixed mobile signals in the 806 MHz to 960 MHz band, with the highest frequency occupancy found between 900 MHz and 1200 MHz, reaching 1.8%. After FAST became operational, new broadcast signals emerged in the 485 MHz to 566 MHz and 614 MHz to 640 MHz bands. Additionally, China Broadnet 5G public mobile communication signals have been added in the 702−798 MHz frequency band, and new fixed and mobile signals have been introduced in the 806−960 MHz frequency band. Meanwhile, affected by the increased deployment density of 2G base stations and the integration of 3G and 4G signals, the frequency occupancy significantly increased in the 1 710 MHz to 1 930 MHz range, with the overall occupancy from 1 200 MHz to 2 000 MHz rising to 6.78%. Compared to the “Interference Protection Requirements for the 500-meter Aperture Spherical radio Telescope (FAST),” not all measured signal spectral power flux densities met the required thresholds. These observations were conducted concurrently with FAST commissioning and operational testing, including signals from telemetry and communications. This analysis provides important reference insights for improving the electromagnetic environment around FAST and guiding its operation.

         

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