一种在NLOS环境下提高精度的TDOA定位方法

An Accuracy Improved Location Method Based on TDOA in NLOS Environment

根据NLOS传播环境下附加传播时延和均方根时延扩展的统计特性,对NLOS误差的均值和方差进行了估计,并对TDOA(到达时间差)的测量值和方差进行了修正,在一定程度上消除了NLOS误差的影响。采用Chan算法对移动台(MS)位置进行定位。仿真结果表明,该方法能够提高Chan算法在NLOS传播环境下的定位精度。

This paper estimates the mean and variance of the NLOS （non-line of sight） error in light of the statistical property of the excessive time delay and the root mean square delay spread in NLOS environment. Then we modify the measurements and variance of TDOA（ time difference of arriral）, So the effect caused by NLOS error is eliminated to some extent. Chan＇ s algorithm is used to locate the coordinates of the mobile station （MS）. The result of simulation proves that the proposed method can improve the location accuracy of Chan＇ s algorithm effectively under NLOS environment.