摘要
喀什13 m甚长基线干涉测量(very long baseline interferometry,VLBI)观测站是中国科学院国家授时中心宽带VLBI观测系统的重要台站,特别是对世界时UT1测量有着不可替代的作用。随着城市的快速扩张和5G移动通信普及,5G移动通信信号等强干扰导致喀什观测站天线系统灵敏度严重下降,严重影响了世界时UT1常规观测。针对此问题,提出利用超导滤波器将接收频带从C频段调整为X频段,设计了优化调整方案并进行了改造实施。测试结果表明,优化后基线灵敏度较优化前C频段提升3.7倍,UT1测量精度提升了12%。
As an important site of the broadband VLBI(very long baseline interferometry)observation system developed by the National Time Service Center of the Chinese Academy of Sciences,the 13-meter antenna system in Kashi plays an irreplaceable role in the measurement of Universal Time(UT1).With rapid urban expansion and the widespread of 5G mobile communication,strong interference from signals such as 5G has severely degraded the sensitivity of the Kashi’s antenna system,which seriously affects the routine UT1 observation.To solve this problem,a solution was proposed to adjust the receiving frequency band from C band to X band by using a superconducting filter.An optimized adjustment was designed and implemented.Experiment results show that the baseline sensitivity after optimization improved by 3.7 times compared to the previous C-band performance,and the measurement accuracy of UT1 is increased by 12%.
作者
马浪明
刘佳
韦沛
李西顺
南凯
姚当
杨旭海
MA Lang-ming;LIU Jia;WEI pei;LI Xi-shun;NAN Kai;YAO Dang;YANG Xu-hai(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;University of Chinese Academy of Sciences,Beijing 100087,China)
出处
《时间频率学报》
2025年第1期60-67,共8页
Journal of Time and Frequency
基金
国家自然科学基金面上项目(12073034
12273047)。
关键词
甚长基线干涉测量
射频干扰
世界时
very long baseline interferometry(VLBI)
radio frequency interference(RFI)
Universal Time(UT1)
作者简介
杨旭海,yyang@ntsc.ac.cn。
