Positioning method of node in wireless sensor network

Abstract

The invention discloses a positioning method of a node in a wireless sensor network. The positioning method comprises the following steps of: establishing a rectangular coordinate system to obtain position coordinates of each anchor node in each wireless sensor network; enabling a node to be positioned to acquire ID (Identification) and position coordinates of all the anchor nodes as well as hop counts of the node to be positioned and the corresponding anchor node in the wireless sensor network through a distance vector exchange agreement, and establishing a corresponding anchor node information list for the node to be positioned; inquiring a self anchor node information list by the node to be positioned; when the number of the anchor nodes is more than or equal to 3 in a 1 hop range, carrying out ranging by using the node to be positioned to acquire a ranging sample between the node to be positioned and each anchor node; and processing the ranging sample by using a voting average combined filtering algorithm to establish a CSS (Chirp Spread Spectrum) ranging mode to acquire accurate ranging information between the node to be positioned and each anchor node.

Description

technical field [0001] The invention relates to the field of wireless sensor network node positioning, in particular to a WSN (Wireless Sensor Network, wireless sensor network) node positioning method based on a filtering algorithm and a CSS (Chirp Spread Spectrum, Chirp Spread Spectrum, chirp spread spectrum) ranging model. Background technique [0002] In many applications of Wireless Sensor Network (WSN), the location information of sensor nodes is very important, because monitoring data without node location information is often meaningless. The precise positioning of the node itself is the premise of providing location information for monitoring events, and it is also the basis for realizing moving target positioning, trajectory tracking prediction, network topology control, and network routing optimization. [0003] According to whether ranging is required or not, existing wireless sensor network positioning methods are divided into: ranging-based positioning methods a...

AI Technical Summary

Problems solved by technology

However, the application of this technology to WSN node positioning still has the following problems that need to be solved urgently: (1) Due to the impact of the surrounding harsh environment on wireless signals, CSS ranging samples have random measurement noise and abnormal ranging point pollution, which seriously deteriorates the ranging (2) Due to the limited energy of sensor nodes, how to design a simple and efficient filtering algorithm to improve positioning performance is a big problem

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