Author(s): Tao Zhiyong, Lu Sun
Pages: 123-126
Year: 2014 Issue:  1
Journal: Computer Applications and Software
Keyword:  Wireless sensor network; Ranging; Localisation; Centroid algorithm;
Abstract: Through the research on relationship of RSSI ranging error and distance in wireless sensor network,we improve the unreasonable factors in weighted centroid algorithm and put forward a revised method.The improved algorithm makes the choice of the weighted factor be more reasonable,since RSSI signal is susceptible to the environment (obstacles,multipath,etc.),so the establishment of signal propagation model function aiming at the specific experimental environment enables the distance measurement more accurate.We verify the feasibility of the algorithm by making use of CC2430 to construct the experiment platform.Error analyses of the centroid algorithm,the weighted centroid algorithm and the revised weighted centroid algorithm are conducted using Matlab on experimental data,numerical simulation shows that the revised weighted centroid algorithm improves the positioning accuracy and can satisfy the basic requirements of the localisation.