5G基站的改进加权质心室内定位算法  

Improved weighted centroid indoor positioning algorithm for 5G base stations

作　　者：闫子春 王小鹏[1] 王博辉 柴海珑 YAN Zichun;WANG Xiaopeng;WANG Bohui;CHAI Hailong(School of Electronic and Information Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学电子与信息工程学院,兰州730070

出　　处：《全球定位系统》2021年第6期44-48,共5页Gnss World of China

基　　金：甘肃省重点研发计划项目(20YF8GA036)。

摘　　要：针对现有基站室内定位算法参与定位基站选择及权重设置不合理导致定位精度低的问题,提出了5G环境下基于接收信号强度指示(RSSI)进行加权质心室内定位算法.该算法通过RSSI测距得到5个已知基站到待定位点的距离,以已知基站位置为圆心作圆,针对相交所得的五边形区域,取任意3个顶点组成三角形,并根据不同的基站类型以及与待定位点的距离,设定合适权重计算三角形质心坐标,利用所得的10个三角形质心坐标做最大似然估计(MLE)得到最终定位点.仿真结果表明:在基站稀疏和密集两种环境下,本算法较经典质心算法和加权质心算法,室内定位精度明显提高.In response to the problem that in existing base station indoor localization algorithm the selection of localization base stations and the unreasonable setting of weights may lead to low localization accuracy,this paper proposes an improved weighted centroid indoor localization algorithm based on received signal strength indicator(RSSI)in the 5G environment.The algorithm obtains the distance from five known base stations to the point to be located by RSSI ranging,and then makes a circle with the known base station location as the centre.For the intersecting pentagonal area,any three vertices are taken to form a triangle.The triangle's centroid coordinates are calculated by setting the appropriate weights according to the type of base station and the distance to the point to be located,and then a maximum likelihood estimation is made based on the ten triangle's centroid coordinates to obtain the final location point.The simulation results show that the indoor localization accuracy of this algorithm is significantly improved when compared with the normal and weighted centroid algorithms in both sparse and dense base station environments.

关 键 词：基站定位 5G基站 接受信号强度指示(RSSI)测距 加权质心算法 最大似然估计(MLE) 

分 类 号：P228.49[天文地球—大地测量学与测量工程]