不同方位角北斗伪距单点定位性能分析

Performance Assessment of Beidou Pseudorange Single Point Positioning with Different Azimuth Angles

为了评估北斗卫星导航系统在南北半球测站的定位性能,从可见星数量、PDOP值以及单点定位精度等多个方面对北斗系统进行了详细分析。介绍了北斗伪距单点定位数学模型与方法,给出了北斗全星座开普勒轨道参数,通过模拟不同方位角遮挡环境来分析多方面性能。结果表明:无遮挡环境下北京和悉尼测站平均可见星达到15颗,南向遮挡环境下北京测站定位误差最大,东西向城市街道定位精度优于南北向城市街道。

In order to assess the positioning performance of Beidou satellite navigation system in the north and south hemispheres stations,the satellite visibility,PDOP value as well as positioning accuracy of the Beidou system are analyzed.The Beidou pseudorange single point positioning mathematical model and principles are introduced and all the Kepler orbital parameters of the full constellation are given,then the positioning performance are analyzed in different simulative azimuth masking environment.The numerical results show that the average 15 satellites are available in the Beijing and Sydney station without the azimuth masking angle,the positioning performance is the worst in the Beijing station with the south masking and the positioning performance in east-west street is better than that in the north-south street.