A dv-hop node localization method based on weighted iteration and double selection

Abstract

The present invention proposes a DV-Hop node positioning method based on weighted iteration and double selection, the steps are: first, use the weighted method to iteratively calculate the average hop distance of the anchor node, and compare the average hop distance error obtained each time, The average hop distance when the error is the smallest is used as the optimal average hop distance of the anchor node; then, the calculation steps in the standard DV-Hop are reduced, and the optimal average hop distance of the anchor node is used to obtain the estimation between the unknown node and the anchor node distance; finally, the anchor nodes are grouped according to how far they are from the unknown nodes, and the potential errors of the least squares method are eliminated by transforming the reference nodes. Calculate the optimal unknown node coordinates of each anchor node group, and then select the coordinate with the smallest error as the final coordinate of the unknown node. The invention can improve the accuracy of the average hop distance of the anchor node and the distance from the unknown node to the anchor node, and has better node positioning accuracy and positioning stability.

Description

A DV‑Hop Node Localization Method Based on Weighted Iteration and Double Selection technical field The present invention relates to the technical field of node location in wireless sensor network, especially relate to a kind of based on weighted iteration and the double-selected DV‑Hop node localization method. Background technique As a new information acquisition and processing technology, wireless sensor networks (WSNs) have been widely used. In many fields, such as: military reconnaissance, medical and health, urban transportation, precision agriculture and forest fire monitoring and so on. for Most of the applications of wireless sensor networks need to know the specific location of the event in order to make corresponding processing. therefore, It is very important to obtain the precise location information of sensor nodes. [0003] The research directions of node positioning technology can be mainly divided into two categories: positioning methods based on ra...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the low positioning accuracy of existing DV-Hop positioning methods and the technical problems that potential errors cannot be eliminated when using the least square method to solve unknown node coordinates, the present invention proposes a DV-Hop node positioning method based on weighted iteration and double selection, using The weighted iteration method is used to obtain the optimal average hop distance of the anchor node, and the coordinates of the unknown node are obtained by using the double selection strategy, which reduces the error of the average hop distance of the anchor node and the distance error between nodes, and further improves the accuracy of the coordinates of the unknown node , which improves the positioning accuracy

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