GPS/GLONASS/GALILEO多星座组合导航系统研究

通过对多星座组合导航系统的分析,对多星座组合导航定位算法进行了研究。由于GPS、GLONASS、GALILEO系统分别采用了不同的坐标系,文中利用坐标系变换将不同星座统一到同一个坐标系中,采用增加状态变量的方法实现了组合系统的时间统一,从而实现了多星座间的时空统一;针对多星座组合系统的可见卫星数目大大增加的特点,采用最小二乘的方法实现了用户的导航定位解算,提高了用户的定位精度。通过对GPS/GLONASS/GALILEO多星座组合导航系统的仿真研究,其结果表明:与GPS单星座相比,GPS/GLONASS/GALILEO多星座组合导航系统,同一时间内可见卫星数目大大增加,PDOP值明显减小,有效提高了导航定位精度,具有良好的定位性能和可靠性。

Research on GPS/GLONASS/GALILEO Multi-constellation Integrated Navigation System

The position algorithm of multi-constellation integrated navigation system was researched.Due to the different reference coordinate and time systems used in GPS,GLONASS and GALILEO system,coordinate conversion and increased elements method were adopted to realize the space-time unification.Aiming at the increasing number of visible satellite,the least square method was used in the position calculation to improve the precision.Simulation validation was carried out on GPS,GLONASS and GALILEO multi-constellation integrated navigation system and the results indicate that in contrast with the GPS single system,the GPS/GLONASS/GALILEO multiconstellation integrated navigation system has perfect orientation ability and reliability,and can simultaneously gain more visible satellites,diminish PDOP value and improve the position precision effectively.