Node positioning method in wireless sensor network and apparatus thereof

Abstract

The invention discloses a node positioning method in a wireless sensor network and an apparatus thereof. The method comprises the following steps: using a wireless signal and a wireless signal attenuation model which is received by a node to be positioned and is sent by each anchor node to calculate a distance between the node to be positioned and the each anchor node; constructing a plurality of anchor node combinations possessing a preset quantity of the anchor nodes; according to position coordinates of the anchor nodes and the distance between the node to be positioned and the each anchor node, calculating the initial position coordinate of the node to be positioned corresponding to the each kind of anchor node combination; calculating ranging variance corresponding to the each initial position coordinate of the node to be positioned and using the ranging variance to carry out quantitative evaluation to the each initial position coordinate; according to a quantitative evaluation result of the each initial position coordinate, determining a final position coordinate of the node to be positioned through a weighting method. Through using a scheme of the invention, measuring data with a large distance error and the error measuring data can be effectively rejected so as to realize a purpose of accurately positioning the node in the wireless sensor network under a complex electromagnetic environment.

Description

technical field [0001] The invention relates to the technical field of regional monitoring, in particular to a node positioning method and device in a wireless sensor network. Background technique [0002] The so-called wireless sensor network refers to a wireless network composed of a large number of stationary or moving sensors in a self-organizing and multi-hop manner. and report to the user. In a wireless sensor network, a large number of sensor nodes will detect data and send it to users through other networks through the sink node. [0003] When using wireless sensor networks to monitor parameters such as temperature, humidity, pressure, and strain, location information is indispensable. If the location information corresponding to each parameter is lacking, the monitored parameter information will become useless information. Therefore, it is very important to determine the location information of sensor nodes in the network, which is the basis for large-scale practi...

AI Technical Summary

Problems solved by technology

However, in complex electromagnetic environments such as outdoor rainy and foggy weather and enemy interference under battlefield environmental conditions, large measurement errors may occur in wireless ranging, and erroneous measurement data may occur, so that the method estimated by the prior art Decreased node location accuracy

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