一种基于CDMA移动网络的TDOA定位算法

A TDOA Localization Algorithm for CDMA Mobile Networks

针对CDMA移动网络导频测距信号,提出了一种基于CDMA移动网络的TDOA定位算法。采用导频时延差作为定位参数,建立了TDOA定位的数学模型,给出了高斯噪声条件下的定位解算方法;针对移动信道中非视距传播时延服从指数分布的特性,采用NLOS协方差估计修正方法减小NLOS对定位精度的影响。仿真结果表明,该方法可有效削弱NLOS误差,性能优于Taylor算法及SI算法,在CDMA信道环境下具有良好的定位性能。

Aiming at the pilot ranging signal of CDMA mobile network, a TDOA localization algorithm based on CDMA mobile network was proposed. Pilot delay was adopted to be the localization parameter and the TDOA mathematical model was set up, and then the positioning solving method under ideal Gauss circumstance was given. In accordance with the trait of Non-Line-of-Sight （NLOS） propagation delay obeying index distribution in the mobile communication environment, NLOS estimation and covariance correction method was presented to decrease the NLOS influence upon positioning accuracy. Simulation results show that the localization algorithm can effectively weaken NLOS error influence, its performance is better than Taylor and SI algorithms. Meanwhile, the proposed algorithm has good positioning performance in CDMA channel environments.