北斗系统IGSO卫星新姿态控制模式下定轨精度分析

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0.31 m，最大为0.67 m；IGSO-6卫星平均为0.18 m，最大为0.28 m。姿态转换期间，激光检核视向精度IGSO-3达到0.2 m，IGSO-6优于0.1 m。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。

Beidou IGSO Satellite Orbit Determination Precision Analysis Based on New Attitude Control Mode

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.