基于LTE网络传输损耗的定位改进算法  

Improved localization algorithm based on the path loss of LTE network

作　　者：石欣 梁妙珠 邱雷[1] 廖天予 王梨 Shi Xin;Liang Miaozhu;Qiu Lei;Liao Tianyu;Wang Li(College of Automation,Chongqing University,Chongqing 400044,Chin)

机构地区：[1]重庆大学自动化学院

出　　处：《仪器仪表学报》2018年第5期57-64,共8页Chinese Journal of Scientific Instrument

基　　金：国家科技支撑计划(2015BAG10B00)项目资助

摘　　要：针对长期演进（LTE）网络定位技术在复杂城市非视距场景下定位精度差的问题,提出一种基于传输损耗的定位改进算法。基于LTE下行链路信号正交频分复用系统特性的研究,完成了时延数据的估计;构建了信号从测量过程到传播过程的误差模型,并延用经典的到达时间（TOA）算法完成位置坐标的初始估计;基于非视距场景下的传输损耗改进算法,完成二次估计,结合复杂城市（ETU）传输损耗误差测量模型,引入信干噪比（SINR）作为传输损耗指数,对终端与基站之间的距离进行了修正。实验结果表明,算法具有抑制NLOS误差能力,定位算法性能良好。The long term evolution（LTE） localization accuray is low in a complex urban scene,which is similar to a Non Line of Sight environment. Thus,this paper presents an improved terminal localization algorithm based on path loss. Firstly,the time-delay is estimated based on the orthogonal frequency division multiplexing（OFDM） system＇s characteristics of LTE downlink signal. Secondly,the error sources from signal measurement to its propagation are studied,and the classic TOA location algorithm is extended to estimate the initial position coordinate. Finally,the transmission loss improvement algorithm is discussed in the Non Line of Sight scene,and the second estimation is completed. In this paper,the path loss model of extened typical urban（ETU） is combined with the SINR signal interference as the transmission loss index to modify the distance between the terminal and the base station. The simulation results show that this algorithm can effectively suppress the NLOS error and has good performance.

关 键 词：LTE 网络定位技术 非视距场景 正交频分复用系统 时延估计 传输损耗指数 

分 类 号：TH70[机械工程—仪器科学与技术]