BDS区域系统定位性能及星座冗余性仿真分析

Simulation Analysis of Positioning Performance and Constellation Redundancy of BDS Regional System

本文首先对北斗区域系统在一般服务区、重点服务区和主要战略方向的定位性能进行了分析和仿真;然后分别针对GEO卫星、IGSO卫星和MEO卫星出现失效卫星时的情况,分析了北斗区域系统定位性能的变化,结果表明,北斗区域系统在服务区内的定位性能达到设计指标,区域星座具有良好的冗余备份性,任意2颗卫星发生故障都不会对定位性能造成明显影响,不同类型卫星对系统性能影响不同,GEO卫星和IGSO卫星对系统影响较大,而MEO卫星对系统影响较小。因此在后续全球卫星星座布设时,要充分考虑GEO卫星的在轨冗余性、IGSO卫星对提高高纬度地区覆盖性能的重要性以及MEO卫星对扩展全球系统性能的重要性。

Firstly the regional Beidou System in general service area,the focus of the service area and our country the main strategic direction of the positioning performance were analysis and simulation;then aiming at the satellite failure existing in the GEO,IGSO satellites and MEO satellites,analyzes the regional Beidou system performance changes.The results show that the positioning performance of the Beidou System in the service area reaches the design target.Regional constellation has a redundant backup good,any of the 2satellite faults have no obvious influence on the positioning performance.Different types of satellite system performance in different impact,GEO satellites and IGSO satellite greater impact on the system,while a smaller impact on the system MEO satellite.So in the subsequent global satellite constellation layout,to fully consider the GEO satellite orbit redundancy,IGSO satellites to improve the coverage performance of the importance and MEO satellites to the expansion of the importance of the global system performance of the high latitudes.