LTE网络中融合二次插值和TOA观测的终端定位方法

Terminal Location Method in LTE Network Based on Quadratic Interpolation and TOA Observation

针对LTE蜂窝网络中移动终端的精确定位问题,提出一种融合二次插值和到达时间(TOA)观测的定位方法 .首先,基站将具有时间差的样本信号发送到移动终端,通过测量获得信号的TOA.然后,计算信号样本之间的互相关性,找出最大值及其相邻的两个值.接着,利用二次插值法,基于这3个点拟合出一个抛物线函数,并以函数最大值所对应的时间差作为最终估计的时间差值.最后,根据时间差值计算出与基站的距离,进而实现终端定位.仿真结果表明,该方法具有较高的定位精度.

For the issue that the precise location of mobile terminal in LTE cellular network,a location method based on quadratic interpolation and time of arrival（TOA）observation is proposed.Firstly,the sample signals with a time difference are sent to the mobile terminal by base station,so as to obtain the TOA of the signal.Then,the correlation between the signal samples is calculated,and the maximum value and the two adjacent values are found.After that,aparabolic function is fitted based on the 3points by parabolic interpolation method,and the time difference corresponding to the maximum value is used as the final estimate value of time difference.Finally,the distance between base station and mobile terminal is calculated according to the time difference,so that to realize the terminal location.Simulation results show that the proposed method has a high positioning accuracy.