一种基于相位差测量的WSN节点测距方法

A WSN Node Ranging Method Based on Phase Difference Measurement

提出了一种基于相位差测量的WSN节点测距方法.该方法任取WSN网络中的两个节点作为发射节点,并使它们以非常接近的高频发射未调制的正弦波以便在空间叠加产生干涉信号,根据网络中不同接收节点测量的其低频RSSI信号的相位值的差值可以得到发射节点和接收节点之间的距离关系并由此最终得出节点间的距离.其特点是有较高的测距精度,可用于WSN节点的2D与3D定位,却无需额外的高精度硬件,适合于低成本的WSN网络应用.实际试验验证了该方法的有效性.

This paper presents a WSN node ranging method based on phase difference measurement.The proposed approach arbitrarily selects two nodes of a WSN network as senders and let them send pure sine waves using very approached frequency so that they can overlap in space and produce interference signal.Other nodes can receive this signal and compute the phase value of its RSSI signal which is low frequency.The distance relationship between the senders and the receivers and then individual distances can be obtained according to the phase difference values of different receivers.The features of the presented technique are that it has relatively high ranging accuracy.In addition,it is applicable to 2D or 3D location of WSN nodes but lsanting no high precision hardware,and then is adapted to low cost WSN network applications.Real experimental results show the effectiveness of the proposed method.