Wireless Localization Algorithm Based on Path Loss Model Parameter Estimated in Real-Time

Localization in wireless sensor networks has drawn increasing attention. According to the problem that it makes a major error by the use of fixed parameters for the measurement of distance,in this paper we proposed an RSSI based cooperative localization algorithm by adjusting the signal propagation model dynamically. Firstly,this method determines the most minimal region where the location node locates according to the RSSI. Then the parameters of path loss model can be evaluated by the cooperation between known nodes in that region. After that we can get accurate distance measurement according to the path loss model,and thereby the location error can be reduced. From the simulation and experiment,we verify that the proposed algorithm can provide higher localization accuracy.