基于STK的BDS星座仿真和性能分析

Simulation and Performance Analysis of BDS Constellation Based on STK

摘要:

利用卫星仿真工具包(STK)设计和建立了北斗卫星导航系统(BDS)的全球星座;在此基础上,选取南北半球不同经纬度的11个城市作为观测点,分别获得了BDS和全球定位系统(GPS)的可见星数和几何精度衰减因子(GDOP)的值,并按照5°×5°的空间分辨率,仿真了全球范围内BDS和GPS的可见星数和GDOP值;仿真结果表明,全球星座的BDS具有与GPS同样优良的导航性能,其在亚太地区的性能甚至更优于GPS,完全可以为用户提供高性能的满足所需导航性能(RNP)的导航服务。

Abstract:

The global constellation of the Beidou satellite navigation system (BDS) is designed and built by means of the satellite simulation tool kit (STK). On the basis of this results, 11 cities are selected as observation points located in different latitudes and longitudes in north and south hemispheres, and the number of visible satellite and the value of the geometry dilution of precision (GDOP) of BDS and global positioning system (GPS) are obtained respectively. The number of visible satellite and GDOP value of BDS and GPS are also simulated worldwide according to the spatial resolution of 5°×5°. The simulation results show that the BDS with global constellation also has fine navigation performance with GPS, and its performance is even better than that of GPS in the Asia Pacific region, and absolutely, the BDS can provide high performance navigation services for the users with the required navigation performance (RPN).