Kalman滤波在GNSS伪距单点定位中的应用

The Application of Kalman Filter in Single Point Position Using GPS C/A Code

GPS定位是利用GPS卫星位置,以卫星天线到接收机天线的距离作为观测值来解算接收机坐标的理论和方法。伪距单点定位仅是以GPS信号中的测距码作为距离观测值以此来解算目标的坐标值及接收机钟差的方法。简单介绍了GPS伪距单点定位的基本理论模型,分别探讨了其最小二乘解法和Kalman滤波解法。最后对两种解算结果进行对比分析,Kalman滤波能够很好的平滑解算结果,使得结果的稳定性更好。

The method of Point Position using GPS makes use of GPS satellites ’positon and distances of antennas of satellites and antenna of receiver .Single point position just make use of C/A code or P code in GPS signal as observations to calculate the position of target and receiver clock-offsets .The basic theory of single point position using GPS C/A code is in-troduced ,and the application of LS and Kalman Filter in thus field is discussed .Finally the numerical example has proved that Kalman Filter could smooth results in different epoch and make results more stable .