星历误差的低次曲面模型改正方法

Low-order surface model correction for ephemeris errors

针对广播星历误差限制了广域差分定位精度的问题,提出了星历误差的低次曲面模型改正方法。通过6个均匀分布的差分站与5颗由GEO、MEO和IGSO卫星组成的导航星座对该方法进行仿真验证,结果表明低次曲面模型法能将星历误差改正到较高的精度。同时,针对6个差分站改正效果均匀性较差的问题,提出了11个差分站优化布局方案,使得低次曲面模型法的改正效果更加均匀,定位精度达到1 m以内。该方法对广域差分定位精度有良好的改正效果,而且在GEO、MEO和IGSO卫星导航星座中具有通用性,对我国卫星导航星基增强系统建设有一定的参考价值。

Aiming at the problem that the positioning accuracy of wide area differential system is limited by ephemeris errors,a method of low-order surface model correction for ephemeris errors was presented in this paper.Six evenly distributed differential stations and five satellites comprises GEO,MEO and IGSO were used in simulations.The results showed that this correction could achieve a high precision.Meanwhile,the positioning accuracy was corrected to one meter and the effect was more evenly by eleven optimized distribution differential stations.This method would have not only a high positioning accuracy but also versatility in a variety of GEO,MEO and IGSO satellite navigation constellation,and provide a reference for the construction of China＇s satellite-based augmentation system of satellite navigation.