多星座组合导航系统定位性能研究

Research on Orientation Ability of Multi-constellation Integrated Navigation System

通过对我国不同纬度地区三个典型城市以及同一地区不同高度角下,从可见卫星数目及PDOP值两个角度,对GPS、GLONASS和GALILEO单星座系统以及其组合系统的定位性能进行了对比分析。仿真结果表明:与单星座系统相比,多星座组合系统的可见星数目大大增加,PDOP值明显减小,在我国不同地区都具有良好的定位性能,并且在卫星高度角较高时仍可以接收四颗以上的卫星,其PDOP值也能达到导航定位的要求。

It studied the orientation ability of GPS,GLONASS and GALILEO and the integrated system by analyzing the visible satellite number and the PDOP value of different latitude regions in China and different elevation angles at same place. The simulation results indicate： in contrast with the single system, the multi-constellation integrated system gains more visible satellites, diminishes PDOP value and owns perfect orientation ability at different regions of China. At the same time, it can also gain more than four teeth visible satellites at higher elevation angle and the PDOP value can meet the need of position.