利用中国VGOS站开展国际联测的EOP精度仿真分析  

Simulated Analysis of EOP Measurement Accuracies with Participation of Chinese VGOS Stations in International Observations

作　　者：钟胜坚 舒逢春[2,3] 李金岭 吴徳[2,4] 何旋 童锋贤 ZHONG Shengjian;SHU Fengchun;LI Jinling;WU De;HE Xuan;TONG Fengxian(School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Shanghai Key Laboratory of Space Navigation and Positioning Techniques,Shanghai 200030,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]上海大学机电工程与自动化学院,上海200444 [2]中国科学院上海天文台,上海200030 [3]空间导航与定位技术重点实验室,上海200030 [4]中国科学院大学,北京100049

出　　处：《武汉大学学报（信息科学版）》2023年第9期1455-1464,共10页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(12073065)。

摘　　要：甚长基线干涉测量(very long baseline interferometry,VLBI)是测量地球定向参数(earth orientation parameters,EOP)的主要空间测地技术之一,中国正在建设名为VLBI全球观测系统(VLBI global observing system,VGOS)的新一代测地VLBI站,通过国际联测优化站网构型是实现高精度EOP测量的必由之路。以3个中国VGOS站为核心站,通过引入2个国外站构建5站联合观测网,分析评估了不同站网构型的EOP测量能力。针对每个站网构型,通过调整4个约束条件的权重因子批量生成相应的观测纲要,采用蒙特卡洛仿真方法选择最优的观测纲要,评价指标为EOP解算值的可重复性。仿真结果表明,由中国站、南非哈特比站以及澳大利亚霍巴特站组成的网型EOP测量能力最强,相对于中国3站组成的网型,dUT1测量精度提高5.7倍,极移的X、Y分量的测量精度分别提高2.8倍和18.3倍。仿真结果可为后续开展高精度EOP组网观测提供参考依据。Objectives:Very long baseline interferometry(VLBI) is one of the main space geodetic techniques for monitoring Earth orientation parameters(EOP).China is building three VLBI global observing system(VGOS) antennas.In order to improve the EOP measurement accuracies,it is necessary to optimize VGOS observing network by extending the domestic VGOS network to an international network.Methods:We set three Chinese VGOS stations located at Shanghai,Urumqi and Beijing as core stations,by adding two international stations selected from four candidate sites located at Hobart of Australia or Bandung of Indonesia,as well as Johannesburg of South Africa or Hawaii of USA,we could form four different 5-station VGOS networks.The performance of EOP measurement accuracies for each network were analyzed based on generation of bulk observing schedules and subsequent large-scale Monte Carlo simulations.We used the repeatability value defined as standard deviation of EOP estimates as an indicator to evaluate the performance of each schedule and each network.We also compared the EOP formal errors of current VGOS observing sessions to our simulation results.Results:The experiment results show that:(1)The EOP measurement capability of the expanded 5-station networks are all much better than that of the 3-station domestic network.(2) The optimized 5-station network,which consists of 3 domestic antennas,Johannesburg in South Africa and Hobart in Australia,has the best EOP measurement results.Compared to the 3-station domestic network,the repeatability of dUT1,the pole motion XP and YP components are decreased by a factor of 5.7,2.8 and 18.3,respectively.(3) The optimized 5-station network could reach equal or even better EOP estimates than that of the current IVS VGOS observing networks.We demonstrated that the EOP measurement accuracies can be improved by optimizing the observing network based on Monte Carlo simulations.Conclusions:The simulation results can be served as a start point for the future development of high-precision EOP observ

关 键 词：甚长基线干涉测量 地球定向参数 甚长基线干涉测量全球观测系统 蒙特卡洛仿真 

分 类 号：P228[天文地球—大地测量学与测量工程]