一种改进的BDS-2/BDS-3联合精密定轨系统偏差处理模型  

An Improved Model for Inter-System Bias Estimation Based on BDS-2/BDS-3 Combined Precise Orbit Determination

作　　者：胡超[1,2,3] 王中元[1,3] 王潜心[1,3] 饶鹏文 HU Chao;WANG Zhongyuan;WANG Qianxin;RAO Pengwen(Key Laboratory of Land Environment and Disaster Monitoring,Ministry of Natural Resources of the People's Republic of China,ChinaUniversity of Mining and Technology,Xuzhou 221116,China;School of Spatial Information and Geomatics Engineering,Anhui University of Science and Technology,Huainan 232001,China;School of Environmental Science and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学自然资源部国土环境与灾害监测重点实验室,江苏徐州221116 [2]安徽理工大学空间信息与测绘工程学院,安徽淮南232001 [3]中国矿业大学环境与测绘学院,江苏徐州221116

出　　处：《武汉大学学报（信息科学版）》2021年第3期360-370,共11页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41874039);江苏省自然科学基金(BK20181361);江苏省研究生科研与实践创新计划(SJCX19_0906);安徽高校自然科学研究项目(KJ2020A0310)。

摘　　要：针对BDS-2与BDS-3卫星之间的差异性,为实现观测数据深度融合,对BDS-2/BDS-3联合定轨中系统偏差(inter-satellite bias,ISB)模型进行研究。首先,基于奇异值分解提取相邻历元观测信息以增加数据利用率,提高ISB解算精度与可靠性;其次,分析了BDS-2/BDS-3联合定轨中ISB特性,发现新信号与BDS-2之间存在明显与接收机相关偏差;随后,利用定轨法方程求解ISB与轨道相关性,结果显示,ISB对北斗轨道精度影响较GPS(global positioning system)显著;最后,通过对ISB时间序列建立短期预报模型,并将预报值作为约束条件引入超快速定轨中。实验结果表明,针对BDS-2/BDS-3超快速轨道,利用提出的ISB的估计与预报模型,可分别改善BDS-2与BDS-3轨道18 h重叠弧段精度(一维)-0.4~1.0 cm与0.8~4.1 cm。因此,所提出的改进的ISB处理模型对优化BDS-2/BDS-3联合定轨策略具有一定参考意义。Objectives:To integrate processing of BDS-2 and BDS-3 satellites observations and to conduct the deeply merged strategy for enhancing the parameter solutions,the differences between BDS-2 and BDS-3 should be considered and analyzed.Methods:Given the differences of BDS-2 and BDS-3 satellites,to fully utilize and fuse the observations,the inter-system bias(ISB)model of BDS-2/BDS-3 combined precise orbit determination is analyzed and improved.Firstly,to improve the accuracy and reliability of ISB,the singular value decomposition is introduced to extract the observation information of adjacent epoch.Secondly,the characteristics of ISB are analyzed,which indicts that the ISBs are significantly presented and related with the types of receivers based on the new signals of BDS-3 and BDS-2.Then,the correlations between ISB and orbit parameters are analyzed;the results suggest that the BeiDou orbit accuracy is affected more significantly than that of GPS.Finally,based on the estimated ISB series,the short-term prediction of ISB model is established by spectral analysis,which is inserted into the ultra-rapid precise orbit determination.Results:With ultra-rapid orbit determination experiments,the proposed ISB prediction and estimation strategies can improve-0.4–1.0 cm and 0.8–4.1 cm for BDS-2 and BDS-3 orbit one-day overlapping,respectively.Conclusions:Therefore,it is meaningful for improving the BDS-2/BDS-3 ultra-rapid combined precise orbit determination with the improved ISB estimation and prediction model.

关 键 词：BDS-2/BDS-3联合定轨 系统偏差 奇异值分解 短期预报 超快速轨道 

分 类 号：P228[天文地球—大地测量学与测量工程]