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文中提出一种基于Doppler效应的无线传感器网络射频干涉定位方法,两个锚节点同时发射具有一定频差的单音信号形成射频干涉,使得各接收节点获得一个低频变化的接收场强指示(RSSI)信号.基于其中一个锚节点移动产生的Doppler效应,在锚节点移动的时间段内,各节点通过测量RSSI信号的振动周期数,便可以获得自身到移动锚节点起点和终点的距离差.从而,通过锚节点的多次移动,各节点根据多组距离差信息,依据双曲线定位算法得到自身的地理位置估计.该定位方法仅需利用节点的无线通信设备,不需要额外的辅助测量装备,同时各节点独立进行自身的位置估计,不需要进行集中处理,是一种分布式的定位方法.理论分析和实验仿真均验证了该方法的可行性.
In this paper, a method based on Doppler effect is proposed for RF interferometric positioning in wireless sensor networks. The two anchor nodes transmit single-tone signals with certain frequency difference at the same time to form radio frequency interference, so that each receiving node obtains a low-frequency receiving field strength indicator (RSSI) Signal.According to the Doppler effect caused by the movement of one of the anchor nodes, each node can obtain the distance difference between the start point and the end point of the anchor node by measuring the number of vibration periods of the RSSI signal within the moving period of the anchor node, Through the multiple movement of anchor nodes, each node gets its own geographic location estimation based on hyperbolic localization algorithm based on multiple sets of distance difference information, which only needs wireless communication equipment of nodes and does not need additional auxiliary measurement equipment, at the same time Each node independently performs its own position estimation without centralized processing and is a distributed positioning method.The theoretical analysis and experimental simulation verify the feasibility of this method.