提高GPS动态单点定位精度的偏移插值法

Using Interpolation of Offsetting to Improve Dynamic Orientation Precision of Single GPS Receiver

对于工作在动态单点方式下的GPS接收机,其C/A码的CEP定位精度一般在20 m左右,而GPS的静态定位精度通常比动态单点定位精度约高一个数量级。为提高动态单点方式下GPS接收机的定位精度,本文依据静态定位的基本原理提出一种动态椭球重心偏移插值算法。这种插值算法将某个时段内由GPS接收机收到的动态定位信息进行处理,使这些信息变成准静态定位信息(遗传定位信息),用这些准静态定位信息和当前接收到的伪距动态定位信息计算出当前的实时定位信息。采用这种方法所计算的实时动态单点定位精度在运动轨迹向量的法线方向上可以达到5 m以内。动态椭球重心偏移插值算法特别适合于对运动载体的定向导航。

The CEP dynamic orientation precision of single GPS receiver is about 20 m on the C/A code mode, while static orientation precision is 10 times of the that of the dynamic orientation. To improve the dynamic orientation precision, this paper presents a method for the dynamic orientation based on the principle of the static orientation, i.e. interpolation of ellipse center-of-gravity offsetting. The algorithm con process the received information of GPS dynamic orientation as quasi static information （genetic orientation information）. Then the current information of the orientation can be calculated by using genetic and received pseudo-distance information. The precision in the normal direction of locus vector is within 5 m. The method for interpolation of ellipse center-of-gravity offsetting is especially suitable for directional navigation of the mobile.