卫星位置误差相关时的三星编队系统时差定位精度

为使三星编队卫星系统的时差定位数学模型更真实地反映现实,该文充分考虑编队星座系统联合观测定轨中存在的卫星位置误差相关性的特点,首次从星座系统整体出发,将单星误差变量转换为可反映误差相关性的具有明确物理意义的星间距离等独立变量,推导出辐射源定位精度的数学模型,并对星座系统整体漂移、几何构形畸变、星座平面旋转、翘动误差对定位精度影响进行分析和数值计算,指出引起星座翘动的非相关误差因素对定位精度影响最大、相关性误差对精度影响最小,并给出了满足系统定位精度达到4km、等精度曲线包含星下点附近直径为3000km区域的条件。

Positioning precision of three satellite constellation using relative locations in the presence of correlated satellite positioning errors

In actual satellite constellations,the satellite positioning errors of multiple satellites forming aconstellation may be correlated. This paper describes a method where the separate absolute satellite positions are convertedrelative positions relative to the entire constellation position to analyze the influence of errors on the geomatic positioning errors of the constellation, including the rotation and tilt of the constellationposition. The result of the analysis indicate that the influence of non-correlated satellite positioning errors related to theconstellation tilt greatly influences thelocation precision and that the influence of correlated satellite positioning errors on theconstellation position is relatively small.