基于CDMA蜂窝网的运动目标检测与定位技术

Moving target detection and location methods based on CDMA cellular networks

利用CDMA蜂窝网中多个基站发射的导频信号实现对三维运动目标检测和定位的方法。根据直达干扰分量的多普勒频移为零,而目标反射信号的多普勒频移非零以及伪随机序列自相关函数的特点,采用级联对消方法滤除各个基站直达分量的干扰;再根据基站间的位置关系及各个导频序列的偏移量,采用该文提出的“簇”方法实现基站与多径时延的配对,完成对定位参数的估计;最后,将Chan提出的TDOA定位方法[7]推广到三维情况,实现运动目标的定位。仿真结果证明了该方法的有效性。

A method of TDOA position location using pilot sequences transmitted by the base stations (BS) in CDMA cellular networks for 3-D moving targets is presented in this paper. First, considering the fact that the Doppler shift of the interfering component is zero and the property of the auto correlation function of PN sequence, the interfering component is filtered using the cascading cancellation. Then, based on the position of the base station and the PN-offset, the match between the BS and time delay is obtained by a so-called cluster proposed in this paper. Finally, in order to estimate position location of 3-D moving targets, the method in the literature[7] is generalized. Its effectiveness is verified by the simulation results.