基于最短路径的GNSS-R镜面反射点算法

The algorithm for the determination of the GNSS-R specular based on the shortest path algorithm

提出一种基于最短路径的全球导航卫星系统反射信号(global navigation satellite systems-reflectometry,GNSS-R)镜面反射点算法。首先,在卫星发射机与接收机形成的线段上,插入该线段二分点以及由发射机、地球球心与接收机3点所形成角的角平分线与发射机与接收机形成线段的交点;其次,计算并比较上述2点星下点的反射路径长度,保留较短反射路径长度;最后,在给定的精度范围内找到最短反射路径,确定镜面反射点。仿真实验结果表明,与Gleason算法和线段二分法相比,提出算法的收敛迭代次数较低,准确性较高。

A global navigation satellite systems-reflectometry(GNSS-R)specular reflection point algorithm based on shortest path method is proposed.Firstly,two points are inserted into the line formed by the satellite transmitter and receiver.One is the bisection of the line segment.Another is the intersection of angle bisector that is formed by the transmitter,the earth's center,and the receiver and this line segment.Moreover,the reflection path lengths of the sub-satellite points at the two points above are compared,and the shorter reflection path length is kept.Finally,the position coordinates of the specular reflection point corresponding to the shortest reflection path are found within a given threshold range.Simulation results show that compared with Gleason algorithm and line bisection method,the shortest path method has lower convergence iteration times and higher accuracy.