基于星间链路体制的北斗卫星时间同步可行性分析  

Feasibility Analysis of Time Synchronization of Beidou Satellite Using Inter-Satellite Observation Data

作　　者：温旭峰 郝金明[1] 胡小工[2] 唐成盼[2] 王冬霞 陈刘成 常志巧 朱陵凤 吴杉 李晓杰 焦博 WEN Xufeng;HAO Jinming;HU Xiaogong;TANG Chengpan;WANG Dongxia;CHEN Liucheng;CHANG Zhiqiao;ZHU Lingfeng;WU Shan;LI Xiaojie;JIAO Bo(School of Surveying and Mapping,Information Engineering University,62 Kexue Road,Zhengzhou 450001,China;Shanghai Astronomical Observatory,CAS,80 Nandan Road,Shanghai 200030,China;Beijing Satellite Navigation Center,22 Beiqing Road,Beijing 100094,China;State Key Laboratory of Geodesy and Earth’s Dynamics,340 Xudong Street,Wuhan 430077,China)

机构地区：[1]信息工程大学地理空间信息学院,郑州市科学大道62号450001 [2]中国科学院上海天文台,上海市南丹路80号200030 [3]北京卫星导航中心,北京市北清路22号100094 [4]大地测量与地球动力学国家重点实验室,武汉市徐东大街340号430077

出　　处：《大地测量与地球动力学》2018年第12期1274-1279,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(61603397);大地测量与地球动力学国家重点实验室开放基金(SKLGED2017-3-3-E)~~

摘　　要：BD-3试验星上搭载了Ka频段星间链路(ISL)设备,可进行Ka波段对地观测。推导了星间链路时分观测体制双向时间同步的数学模型;以ISL星地观测数据为样本分析ISL体制时间同步的可行性,并与L波段观测结果比对。结果表明,ISL体制钟速拟合参数与L波段结果一致性较好,7d和3d弧段拟合精度在1ns以内,1d和1h弧段拟合精度均在0.2ns以内,较L波段拟合精度有所提高,其中1d为最优拟合时长;利用7d的实测星地钟差进行向后1d的钟差预报,结果显示,ISL星地钟差1d预报误差为2ns,较L波段预报精度略有提高;最后采用星地星间联合钟差观测,2d内观测残差为0.52ns,验证了ISL钟差观测的可行性。Beidou-3 experimental satellites are equipped with Ka band inter-satellite link(ISL)equipment,which provides satellite-ground orbit determination and time synchronization observation means of ISL mode.The mathematical model of synchronous observation of time-division satellite-ground two-way ISL mode is derived.Taking the satellite-ground data of ISL as a sample,the feasibility of time synchronization in ISL system is analyzed and compared with L band observations.The results show that the fitting parameters of clock offset in ISL system are consistent with those of L band.The fitting accuracies within 7 days,3 days,1 day and 1 hour are respectively 1 ns,0.85 ns,0.2 ns and 0.2 ns,which,especially for 1 day fitting,are better than those of L band.At the same time,the clock offset prediction accuracy of the next day is analyzed by using seven-day measurements of the satellite ground clock offset.The prediction error of ISL satellite clock offset is within 2 ns.Finally,the satellite-ground and inter-satellites combined observation is carried out.The error in 2 days observation is 0.52 ns.The feasibility of ISL observation is verified.

关 键 词：北斗新一代试验星 星间链路 时间同步 钟差预报 

分 类 号：P228[天文地球—大地测量学与测量工程]