基于WiFi的目标反射信号提取及定位算法

Target reflection signal extraction and location algorithm based on WiFi

近年来,利用WiFi的普遍性与其提供的信道信息对覆盖范围内的人物进行定位成为一个十分热门的研究方向。现存的室内定位通常需要提前在离线阶段建立相应特征库,有些系统还对设备有特殊要求。文章提出了一种基于商用WiFi路由器和无线网卡的系统,通过对信道状态信息(CSI)进行处理,成功分离出由移动目标反射的动态路径信号,用于参数提取,构建定位模型,对目标进行定位跟踪,可以做到0.7 m精度的定位。

In recent years,use the universality of WiFi and the channel information it provides to locate the people has become a very popular research direction.The existing indoor positioning usually needs to establish the corresponding feature library in the offline stage in advance;some systems also have special requirements for equipment.In this paper,a system based on commercial WiFi router and wireless NIC is proposed.By processing the CSI information,the dynamic path signal reflected by the mobile target is successfully separated for parameter extraction,and the positioning model is constructed to locate the target,which can achieve 0.7 m precision track.