CDMA蜂窝网无线定位技术中NLOS误差的抑制方法

NLOS Error Mitigation Methods in Wireless Orientation Technology of CDMA Cellular Networks

在CDMA蜂窝网无线定位系统中,针对非视距(NLOS)误差严重影响定位性能这一问题,提出了一种基于最陡梯度下降法的NLOS环境下的TDOA定位方法。该方法结合Chan氏算法,通过迭代,逐渐完成对NLOS误差的估计,并判定NLOS基站,在此基础上对NLOS基站测量值进行逐步修正,从而完成对目标的定位。最后的仿真表明,此算法可以有效实现NLOS环境下的目标定位。

In wireless orientation technology of CDMA cellular networks, the NLOS error can degrade the loca- tion accuracy badly. To overcome this limitation, a new NLOS error mitigation methods is presented based on the steepest gradient descent method. By iterating gradually, the NLOS error can be estimated using the Chan algorithm, which can be used to judge the NLOS base. After that, the target location can be obtained with the modified measured data of the judged NLOS base. A computer simulation is given to illustrate the effectiveness of the proposed method.