顾及RPDOP值的GPS变形监测抗差Kalman滤波

ROBUST KALMAN FILTERING BASED ON RPDOP VALUE IN DEFORMATION MONITORING USING GPS

在GPS变形监测中,受周跳、多路径效应、衍射以及卫星图形结构的影响,位移观测值中常含有粗差,而卫星图形结构并不是一个定位误差源,其对定位精度的影响实质是导致定位解算时法方程的不稳定。为此,将GPS精密定位中的相对定位几何精度因子作为先验信息用于抗差Kalman滤波,以进行合理的抗差降权。应用结果表明,引入RPDOP值的抗差Kalman滤波具有更好的抗差效果。

In deformation monitoring with GPS, gross errors often exist in displacement observations, for influ- ence of cycle slip, multipath effect, diffraction and the geometry of satellites. The geometry of satellites is not an er-ror source of positioning, it affects positioning precision basically by the unstable normal equation. RPDOP（ Rela- tive Position Dilution Of Precision） of GPS precise positioning is incorporated into robust Kalman filter so that a rea- sonable weigh can be obtained. The result from practical GPS slide deformation monitoring application indicate that RPDOP based robust Kalman filter is effective.