Cooperative Localization Algorithm for Sensor Node in Wireless Sensor Networks

The wireless localization in sensor network is a work deciding a location of a sensor node. It is necessary to perform the important role such as the geometrical routing, tracking and the detecting based on localization. In this paper, we propose a cooperative localization algorithm to estimate a location of the sensor node in wireless sensor network over LOS signals and NLOS signals environment and analyze the error performance of the estimated location. The proposed algorithm gets each location coordinate using all received signals because it is difficult to identify NLOS signals due to the all received signals. After eliminating the estimated locations from the NLOS signals iteratively, we decide a location of the sensor node with LOS signals. We apply TDOA method which uses arrival times to estimate the location and make a group with three readers to get the location information as much as possible. From the results, we confirm that the elimination of the reasonable number of the estimated NLOS location improve the estimation error performance.