The Haoping 40 m radio telescope at the National Time Service Center,Chinese Academy of Sciences was built in 2014 and is primarily used to observe navigation satellites and pulsars.Since the first successful very lon...The Haoping 40 m radio telescope at the National Time Service Center,Chinese Academy of Sciences was built in 2014 and is primarily used to observe navigation satellites and pulsars.Since the first successful very long baseline interferometry(VLBI)observation of L-band radio source fringes in 2022,ten observations have been made so far.The stations involved in the observations include the Haoping 40 m radio telescope(Haoping),the Tianma 65 m radio telescope(Tianma),the Nanshan 26 m radio telescope(Urumqi),the Guizhou 500 m radio telescope(FAST),the Jilin 13 m radio telescope(Jilin),the Effelsberg 100 m radio telescope(Effelsberg),the Onsala 25 m radio telescope(Onsala),and the Chiang Mai 40 m radio telescope(Chiang Mai).This paper presents details on the specifications of the Haoping 40 m radio telescope,as well as the design of the VLBI experiment,the observation process,and the data processing.We also discuss the analysis of the fringe results involving the Haoping 40 m radio telescope,using Distributed FX Correlator to obtain excellent results.We confirm that the telescope is capable of participating in VLBI observations and performing specific data processing tasks.It can therefore play a greater role in future VLBI observations.展开更多
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...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%。展开更多
甚长干涉测量技术(Very Long Baseline Interferometry,VLBI)起源于20世纪60年代,它的发展已经对大地测量、地球动力学和天体测量产生了深远的影响。同样,VLBI终端系统作为VLBI系统的重要组成部分,在近40年里也在不断地更新和快速发展,...甚长干涉测量技术(Very Long Baseline Interferometry,VLBI)起源于20世纪60年代,它的发展已经对大地测量、地球动力学和天体测量产生了深远的影响。同样,VLBI终端系统作为VLBI系统的重要组成部分,在近40年里也在不断地更新和快速发展,从一开始的Mark 1系统发展到现在的Mark 5系统,从一开始的磁带记录到现在的硬盘记录甚至通过因特网就能实现数据的实时传输,可以说发生了翻天覆地的变化。如今Mark 6系统也已经开发出来,相信不久的将来,该系统会广泛应用于天文领域。主要描述了VLBI终端系统的发展历程和未来展望。展开更多
基金supported by the National Science and Technology Major Project(E152KJ1201)the Natural Science Basic Research Program of Shaanxi(2024JC-YBQN-0036)+1 种基金the National Natural Science Foundation of China(42030105 and 11973046)the National SKA Program of China(2020SKA0120200).
文摘The Haoping 40 m radio telescope at the National Time Service Center,Chinese Academy of Sciences was built in 2014 and is primarily used to observe navigation satellites and pulsars.Since the first successful very long baseline interferometry(VLBI)observation of L-band radio source fringes in 2022,ten observations have been made so far.The stations involved in the observations include the Haoping 40 m radio telescope(Haoping),the Tianma 65 m radio telescope(Tianma),the Nanshan 26 m radio telescope(Urumqi),the Guizhou 500 m radio telescope(FAST),the Jilin 13 m radio telescope(Jilin),the Effelsberg 100 m radio telescope(Effelsberg),the Onsala 25 m radio telescope(Onsala),and the Chiang Mai 40 m radio telescope(Chiang Mai).This paper presents details on the specifications of the Haoping 40 m radio telescope,as well as the design of the VLBI experiment,the observation process,and the data processing.We also discuss the analysis of the fringe results involving the Haoping 40 m radio telescope,using Distributed FX Correlator to obtain excellent results.We confirm that the telescope is capable of participating in VLBI observations and performing specific data processing tasks.It can therefore play a greater role in future VLBI observations.
文摘喀什13 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%。
