基于GEO／HEO混合星座的区域卫星定位系统性能分析

星座方案选择对卫星定位系统的性能具有很大影响。本文结合GNSS－2星座方案中的阿基米德计划，设计了针对我国区域的HEO／GEO混合星座，首先从可见性角度对GEO卫星定点参数和HEO卫星轨道参数进行了优选，之后，以GDOP和PDOP因子为衡量标准，在选定覆盖区域内，对混合星座的定位性能进行了分析，仿真结果表明，在覆盖区域内，该星座能够达到与GPS相当的定位精度。

PERFORMANCE ANALYSIS FOR REGIONAL SATELLITE POSITIONING SYSTEM BASED UPON GEO/HEO HYBRID CONSTELLATION

As for satellite positioning system, selection of constellation type would greatly influence the performance .of positioning. Connected with Archimedes plan among constellation schemes for GNSS-2, this paper presents a GEO/HEO hybrid position ing constellation by using three HEO satellites and three GEO satellites, here the objective region is chosen as our country. Firstly, the parameters for GEO and HEO satellites are optimized from regional visibility. Secondly, positioning performance analysis for the given hybrid constellation are provided in certain region measured by GDOP and PDOP. Simulation results show that we can expect similar accuracy with GPS in certain region by the hybrid constellation put forward here.