修正Kalman滤波在北斗授时中的应用

北斗卫星导航系统中北斗单向授时用户的授时精度与其上行时延值变化较大有直接关系。经过分析发现,在出现连续较大的野值情况下,线性Kalman滤波算法不能正确估计上行时延值,从而影响北斗用户正常使用。因此,对算法进行了相应修改并提出了基于修正的卡尔曼滤波算法,完成上行时延值的估计方法,同时对该算法进行了仿真,实验结果表明了该算法的正确性。

Application of Modified Kalman Filter Algorithm in Beidou Timing

Beidou timing user cannot accomplish precise one-way timing because of l arger changes of uplink delay in Beidou Satellite Navigation System.It is found that the linear Kalman filter algorithm cannot exactly estimate the uplink dela y value when the continuous large wild values appear,which cannot be used norma lly for consumer.So the algorithm is modified and measure is brought forward to estimate the value of uplink delay using Kalman filter algorithm.At the same t ime,the simulation is carried out,and the experimental result indicates that t he algorithm is right.