基于WGS-84地球模型的三站时差定位算法

Tri-station TDOA Location Algorithm Based on WGS-84 Earth Model

针对基于WGS-84地球模型的三站时差定位算法,从定位模糊、定位精度和运算效率3个方面,综合比较了传统的牛顿迭代算法与一种基于测量站覆盖范围的局域参考坐标系(以下简称局域参考坐标系)下算法的性能。将局域参考坐标系下算法的定位结果作为牛顿迭代的初值,结合两种算法,形成一种综合算法,并对3种算法进行性能比较。由仿真结果可知,综合算法的定位精度、运算效率均较高,同时减少了定位模糊问题的发生,兼具传统牛顿迭代算法和局域参考坐标系下算法的优点。

For the tri-station time difference of arrival（TDOA） location algorithm based on WGS-84 ellipsoid model,the comparison between traditional Newton-iteration algorithm and the algorithm based on station coverage local reference coordinate system（local reference coordinate system for short thereinafter） is presented,including location ambiguity,location precision and computation efficiency.The result of the algorithm based on local reference coordinate system is regarded as the initial value of the Newton-iteration algorithm.The two algorithms are combined to form an integrative algorithm.The properties of the integrative algorithm are compared with other two algorithms.Simulation results show that the integrative algorithm can not only achieve high-precision and high-efficiency, but also reduce the appearance of location ambiguity.It has the good properties of both two algorithms.