中国深空网单基线UT1-UTC解算仿真分析及验证  

Simulation and Verification of UT1-UTC Determination by Using Single Baseline in China Deep Space Network

作　　者：路伟涛 陈略[1,2] 韩松涛 LU Weitao;CHEN Lue;HAN Songtao(National Key Laboratory of Science and Technology on Aerospace Flight Dynamics,Beijing 100094,China;Beijing Aerospace Control Center,Beijing 100094,China)

机构地区：[1]航天飞行动力学技术重点实验室,北京100094 [2]北京航天飞行控制中心,北京100094

出　　处：《遥测遥控》2024年第6期55-63,共9页Journal of Telemetry,Tracking and Command

基　　金：航天飞行动力学技术重点实验室基金(KGJ6142210210201)。

摘　　要：UT1-UTC (世界时-协调世界时)表征了地球自转规律,在空间自主导航、深空探测器定轨等空间探测活动中具有重要作用。考虑到我国尚未建立较为稳定的UT1-UTC自主保障机制,在该系统规划建设和试验初期开展UT1-UTC监测仿真具有较强的参考意义。本文利用VieSked++软件开展了UT1-UTC解算蒙特卡罗仿真分析,并利用实测数据对仿真结果进行了验证。首先,对IVS (International VlBI Service,国际测地与天体测量VLBI服务组织)常规观测进行了仿真,并利用约100次IVS常规观测值进行了对比验证,表明实际解算精度约为1.4倍的可重复因子。其次,对中国深空网南北半球单基线分别进行了UT1-UTC加强观测仿真,分析表明深空网JM-KS (佳木斯深空站-喀什深空站)基线、NM-AG (纳米比亚深空站-阿根廷深空站)基线的解算精度预期分别约为18μs和22.4μs。再次,利用中国深空网JM-KS基线UT1-UTC观测数据进行处理验证。最后,在统筹深空网测站资源的基础上,开展了多站、多基线UT1-UTC监测能力仿真。本文结果有效评估了基于中国深空网单基线开展UT1-UTC监测解算的能力,为后续系统建设、UT1-UTC解算能力评估等提供了参考。As one of the earth orientation parameters,UT1-UTC characterizes the irregularities of the earth rotation speed,and plays an important role in many space exploration activities such as space autonomoμs navigation,deep space probe orbit determination.Yet China has not established the relatively stable independent guarantee ability of UT1-UTC,it is of great reference significance to carry out UT1-UTC determination simulation at the early stage of system planning and construction.In this paper,the Monte Carlo simulation analysis of UT1-UTC solution is carried out by μsing VieSked++ software,and the measured data is utilized to verify the simulation conclμsions.Firstly,the IVS conventional observation mode is simulated,and subsequently about 100 times of IVS conventional observation data are used for comparison and verification.The results show that the actual solution accuracy is about 1.4 times of the repeatability factor.Secondly,the UT1-UTC intensive observation simulation is carried out for the single baseline of the Chinese deep space network,which is located in the northern and southern hemispheres,respectively.The simulation results show that the UT1-UTC solution accuracy of the JM-KS baseline and the NM-AG baseline of the deep space network is expected to be about 18 μs and 22.4 μs,respectively.Furthermore,the real observation data by JM-KS baseline of China deep space network are used for resolving UT1-UTC to verify the simulation result.Finally,on the basis of deep space network station resources,the simulation of multi-station and multi-baseline UT1-UTC monitoring capability is carried out.The results of this paper effectively evaluate the ability of UT1-UTC monitoring based on single baseline of China deep space network,and provide reference for subsequent system construction and UT1-UTC solution ability evaluation.

关 键 词：UT1-UTC 中国深空网 VieSched++ 蒙特卡罗仿真 

分 类 号：V556.1[航空宇航科学与技术—人机与环境工程] P127.15[天文地球—天体测量]