基于参考站的低轨单星测频定位误差校正分析

摘要

It was analyzed in the paper about the location error correcting of the single LEO satellite Geo - location system. The satellite will be interfered in the moving process, resulting ephemeris errors which lead to location error. To solve this problem, according to the reference station error correction algorithms, the location error covari-ance matrix before and after adding reference stations was given. Finally, the simulation under different conditions was given. It was revealed mathematically that the location error can be calibrated by adding reference stations. Simulation results show that the location error can be obviously improved near the reference stations, and the location error distribution was also simulated when the reference station was located at the blind location area. The results can provide a theoretical basis for the construction of reference stations.%分析了低轨单星测频定位体制中的定位误差校正问题,由于卫星移动过程受到干扰影响,产生星历误差.为解决上述问题,根据参考站的误差校正算法,推导了引入参考站前后的定位误差协方差矩阵,最后对不同条件下参考站对定位误差的校正作用进行试验.从数学上揭示了参考站对系统定位误差的校正作用,通过引入参考站,实现定位误差的校正.仿真结果表明,在参考站位置附近的区域定位精度明显提高,同时仿真分析了在定位盲区引入参考站时的定位误差分布.研究结果可为实际系统参考站优化定位校正提供理论依据.