RANGE FREE LOCALIZATION SCHEME AND APPARATUS IN IRREGULAR WIRELESS SENSOR NETWORKS

摘要

The present invention relates to a range-free position recognition scheme in a non-uniform wireless sensor network and an apparatus thereof. The scheme of the present invention broadcasts its own position information at an anchor node having fixed position information, estimates the distance of a neighboring node in correspondence to density of the neighboring node at a normal node receiving the position information of the anchor node, corrects the estimation distance according to a node existing within an estimated distance sensing radius after changing a communication radius by referring to 1-hop distance through the estimation distance estimated at each node and then spreading the changed communication radius, corrects an error of the correction distance by calculating an error rate of a difference between the correction distance of the estimation distance and real distance between anchor nodes, and estimates the position of each node using the distance whose error is corrected. According to the present invention, the scheme can obtain position measurement result of high quality by performing a density probability modeling scheme and a sensing radius adjustment scheme estimating a distance by applying the characteristics of density with different distance at each node in a non-uniform network environment.