镜面对称法在单点定位中的应用

APPLICATION OF MIRROR SURFACE SYMMETRY METHOD TO POINT POSITIONING

针对GPS伪距单点定位高程精度低的现状,提出一种新的基于镜面对称的单点定位方法。此方法采用过测站近似坐标的地球椭球切平面作为对称面(镜面),将可见卫星对称生成虚拟卫星,利用实测伪距值构成虚拟观测值,将实测伪距值、虚拟观测值联合用于单点定位。理论上,新方法不仅增加了用于定位解算的卫星数目,而且改善了高程方向的几何结构。实验结果表明,此方法能够有效地提高单点定位精度,尤其是高程精度。

Cosidrering the actuality of GPS pseudorange point positioning with bad height accuracy, a new approach named as mirror surface symmetry method is proposed. It takes the tangent plane through the approximate coordinate of the station on the ellipsoid as the symmetry plane. The real observable satellites make the virtual satellites by symmetry, the pseudorange observation values of the real observable satellites are used to constitute the virtual observation values. The new approach, using the real observation values, virtual observation values for point positioning, can not only increase the number of satellites used to position but also improve the geometric structure in the GPS height direction in theory. The computation results of the experiment computations indicate that the effect of the new method obviously excel that of the existing method in the accuracy of the point positioning, especially the GPS height accuracy.