北斗系统IGSO卫星新姿态控制模式下定轨精度分析

摘要

2016-03-30发射的北斗卫星导航系统IGSO-6卫星采取了不同于之前在轨运行的IGSO卫星的姿态控制模式,在地影期间保持连续动偏模式.利用多个观测网的观测数据进行GPS/BDS联合定轨,分析了IGSO-6卫星的定轨精度.结果表明,IGSO-3卫星地影期间轨道重叠段3D精度平均为0.31m,最大为0.67 m;IGSO-6卫星平均为0.18m,最大为0.28 m.姿态转换期间,激光检核视向精度IGSO 3达到0.2m,IGSO-6优于0.1m.相比于同时段经历地影期的IGSO-3卫星,采取新的姿态控制模式后,IGSO-6卫星能够有效避免因为地影期导致的定轨精度下降.%Launched on March 30,2016,the IGSO-6 satellite of the Beidou navigation system has new attitude control modes compared to in orbit operation ofother IGSO satellites of the Beidou navigation system.In particular,during the earth's eclipse,it keeps yaw-steering mode.In this paper,multiple observation data are used to analyze the orbit accuracy of the IGSO-6 satellite.The experimental results show that:during the earth's eclipse,the IGSO-3 satellite overlap accuracy reach 0.31 m for average and 0.67 m for the largest,while the IGSO-6 satellite gets 0.18 m for average and 0.28 m for the largest;during the changing of control mode,SLR validation reaches 0.2 m for the IGSO-3 satellite and less than 0.1 m for the IGSO-6 satellite.Compared to the IGSO-3 satellite,which experiences the earth's eclipse at about the same time period,the IGSO-6 satellite with new attitude control mode can effectively avoid the decrease in precision of orbit determination.