非视距传播环境下的一种TDOA定位算法

A TDOA-based Location Algorithm with Non-Light-of-Sight Propagation Considered

各种基于移动台位置的服务急剧增加,导致提供定位业务成为无线网络发展的必然趋势。针对实际定位应用时常出现的非视距(NLOS)传输问题改进TDOA定位算法,其基本思路是将TDOA估计转化为两步最大似然线性估计,并加入松弛因子表示NLOS的影响,通过迭代方式逐步消除NLOS对定位的影响。该算法结构简单,计算量不大,仿真结果证实了其有效性。

An effective TDOA location algorithm which can mitigate the influence of Non-light-of-sight (NLOS) propagation,is considered.By using some methods of processes,the nonlinear estimation can be approximately realized by two-step Maximum-likelihood (ML) linear estimation.By inserting some loose variables to represent NLOS,an iterative algorithm for the ML linear estimation is used to mitigate the NLOS's effect.This method is simple and can save the computation time.Its efficiency is verified by the simulation results.