大口径阵列射电望远镜预选台址的电磁环境监测与分析

Electromagnetic environment monitoring and analysis of the candidate site for the large array radio telescope

我国正在进行大口径单天线和阵列射电望远镜的建设和预研工作。为保障射电望远镜前期建设工作的开展,首先需要找到满足电磁环境要求的台址,本文使用搬移式电磁环境监测装备在广东省清远市阳山县杜步镇、水口镇等预选台址开展了电磁环境监测,并对广州市白云区帽峰山开展对比测试,采用一种干扰阈值判断方法对电磁环境监测数据进行了分析。分析结果显示,位于清远市阳山县杜步镇附近的洼地射频干扰(radio frequency interference,RFI)数量少且强度弱,该洼地远离城市中心,经济活动少,周围群山环抱,具有良好的电磁隔离性,适合大口径单天线和阵列射电望远镜的建设。本文的数据分析结果可为大口径射电望远镜的选址提供依据。

China is carrying out the construction and preconstruction of large aperture spherical radio telescope and array radio telescopes.In order to guarantee the pre-construction work of radio telescope,it is necessary to find a station site that meets the requirements of electromagnetic environment firstly,and electromagnetic environment monitoring is carried out in candidate sites such as DuBu Town and Shuikou Town of Yangshan County,Qingyuan City,Guangdong Province,by using moving electromagnetic environment monitoring equipment,and comparative testing is carried out on MaoFeng Mountain of BaiYun District,Guangzhou City,and electromagnetic environment monitoring data are analyzed by using a method of judging the threshold value of the interference.The analysis results show that the depression located near DuBu Town,Yangshan County,Qingyuan City,has a low number and weak intensity of radio-frequency interference,which is far away from the city center,has few economic activities,is surrounded by mountains,and has good electromagnetic isolation,which is suitable for the construction of large aperture spherical radio telescope and array radio telescopes.The results of the data analysis in this paper can provide a basis for the site selection of large aperture spherical radio telescopes.In the future,the establishment of a radio quiet zone in the depressions and within a reasonable range near Dubu Town can be considered to protect the existing electromagnetic environment.