Research On Localization Technology Of Antonomous Mobile Nodes In Wireless Sensor Networks

In the wireless sensor networks (WSN), the localization technique of the autonomous mobilenodes which can obtain their own movement information including the relative displacement andthe relative deflection angle is unique to some extent. In the thesis, the localization technology ofautonomous mobile nodes and anchor nodes placement algorithm in WSN were studied.The paper introduced basic node localization technologies firstly and reviewed mobile nodeslocalization algorithms in detail. Following, the improved localization methodologies underdifferent applications are presented with the special characteristics of autonomous mobile nodesconsidered. In the case of small area monitered by the WSN, the history-based localizationmethodology was presented by employing the last position as one virtual anchor node during thecurrent localization in order to decrease the error of the conventional distance-measure basedmethods. On this basis, the synthetic prediction algorithm incorporating the relative deflectionangle was proposed. The implementations and experimental results were also described.Under the condition of large area monitored by the WSN, the movement information basedMonte-Carlo localization algorithm was raised which reduces the sample area by applying thenode movement information in the predictive stage and improves the filter method with the anglecombined. According to the simulation analysis and the comparision with the conventionalMonte-Carlo localization methods, the proposed strategy showed the excellent performance inthe positioning accuracy.The anchor nodes placement is the premise of the WSN application and the foundation ofthe mobile node localization. One improved anchor nodes placement methodology meeting therequirelents of overall converage and was presented with the full consideration of the perceptiondistance and the in the paper. The lesser number of anchor nodes can be acquired which wasverified by the simulation results.