低低卫-卫跟踪模式中星载KBR系统和GPS接收机指标设计论证

Demonstration on the Indexes Design of Space-borne KBR and GPS Receiver in the Low-Low Satellite-to-Satellite Tracking Mode

摘要: 推导了星载KBR系统的星间距离、星间距离变化率以及星载GPS接收机的卫星轨道位置误差分别影响累计大地水准面精度的误差模型,确定了星载KBR系统和星载GPS接收机的精度指标,建立了星间测速和轨道位置误差联合影响累计大地水准面的误差模型。结果表明,星载KBR系统的星间距离精度指标约为0.64×10-6m,星间距离变化率的精度指标约为0.8×10-6m/s,星载GPS接收机的卫星轨道位置精度指标约为2.1cm。在上述精度指标下,联合误差模型恢复120阶地球重力场对应的累计大地水准面精度约为26cm。

Abstract: The error models of cumulative geoid height influenced by the errors of intersatellite range,range rate of KBR system and the satellite position of GPS receiver are deduced respectively.The combined error model of cumulative geoid height influenced by range rate error and satellite position error is also constructed.The results show that the precision indexes of inter-satellite range,range rate of KBR system are about 0.64×10-6 m,0.8×10-6 m / s,respectively.While the precision indexes of satellite position of GPS receiver is about 2.1cm.The cumulative geoid height error of Earth ’ s gravity field model in 120 degree,which is recovered by the combined error model,is 26cm in the presence of these precision indexes.