一种速度平滑高程的增强定位方法

An Enhanced Satellite Positioning Algorithm Based on Height Smoothing with Speed

为提高全球导航卫星系统定位精度与连续性,提出结合使用高程坐标分量与速度分量,设计构成一种组合滤波器。利用速度测量值不断对用户高程进行平滑与修正,获得高精度的高程坐标值,并由此对测量方程组形成高程约束条件,进而提高全球导航卫星系统三维定位精度及接收机钟差解算精度。同时,由于滤波器处理后的高程值序列具有较高的精度和良好的平滑性,因此特别适于拟合与外推,从而更好地辅助卫星信号缺失的非完备星座情况,实现连续三维定位。最后,通过全球定位系统实测实验对方法进行了分析,验证了其可行性与实用性。

In order to improve the accuracy and continuity of satellite positioning, a combined filter is proposed to be designed and constituted by using a combination of height coordinate component and velocity component in this paper. User height is continually smoothed and revised to obtain a height coordinate of high precision, and thus forming a height constraint of measurement equations. And then, the accuracy of 3D positioning and receiver clock solution results could also be improved. Meanwhile, due to the high precision and favorable smooth texture of the height values after filter processing, they are especially suitable for fitting and extrapolation, and could help to assist the incomplete situation while the signal of GPS is lost and realize continuous 3D positioning. At last, feasibility and availability of the method are analyzed and verified by GPS positioning experiment.