关键词: 无线传感器网络, 节点定位, 锚节点, 平均每跳距离, 极大似然法, 距离向量算法

Abstract: In wireless sensor networks, aiming at the default that DV-Hop localization algorithm has large errors in the calculation of the distance of unknown node to an anchor node and the jump distance of the adjacent nodes in the communication radius, this paper presents an auxiliary anchor node distributed localization algorithm. This algorithm does not require any ranging technical support. It uses the power control of the anchor nodes by sending the beacon signals with different transmit powers, and the unknown nodes which receive the beacon signals will record the beacon information. It uses whole network anchors to fix separate anchor nodes on per hop distance, and then calculates the coordinates of nodes with great natural method. The Matlab simulation results show that in the same network environment, this algorithm can effectively reduce positioning errors caused by distance calculation and is suitable for the actual situation with high accuracy.

Key words: Wireless Sensor Networks（WSN）, node location, anchor, average hop distance, maximum likelihood method, Distance Vector（DV）-Hop algorithm