一种有效减小非视距传播影响的TOA定位方法

本文基于移动通信环境中非视距(NLOS)传播时延服从指数分布的特性,提出了一种有效减小NLOS影响的定位方法.该方法首先利用测量的波达时间(TOA)和NLOS传播时延的统计特性估计由NLOS引起的附加时延;然后从测量的波达时间中减去附加时延,得到对LOS传播时间的估计,进而估计移动台的位置;最后,对不同时刻估计的移动台位置进行平滑处理,进一步减小NLOS的影响.采用该方法对移动台的位置进行的估计是一种无偏估计,不需要增加系统成本,计算简单,是一种非常实用的定位方法.仿真结果证明了该方法的有效性.

An Effective TOA-Based Location Method for Mitigating the Influence of the NLOS Propagation

Based on the statistical property of the non line of sight(NLOS)propagation in the mobile communication environment ,an effective location method is presented to mitigate the influence of the NLOS propagation.First,the excess delay caused by the NLOS propagation is estimated using the measured time of arrival(TOA)and the statistical property of NLOS propagation; and then the excess delay is removed from the measured TOA to estimate the line of sight(LOS)propagation time and the position location of the mobile station(MS); finally,the position locations of the MS of different time are smoothed to improve the precision of the position location of the MS.The location of the MS estimated by this method is unbiased.The method does not increase the cost.It is a simple and practical method.Its effectiveness is verified by the simulation results.