The analysis and research on the accuracy of WSN node location under the influence of multipath reflection

The problem of the ranging accuracy which was influenced by the multipath reflection of wireless sensor network (WSN) node that was based on the value of received signal strength indication(RSSI) is proposed, The method of empirical mode decomposition(EMD) and kalman filtering were used to increase the ranging accuracy. The cause that the accuracy was reduced by the multipath reflection was studied, and then the ranging curve was fitted by the least square method. At last, the error was reduced by the method of EMD and kalman filtering which were contrasted in this paper. The results of experiment show that, the EMD algorithm has higher accuracy than the least square method, but the values of RSSI couldn't be handled in real time; The accuracy of the distance was improved by the kalman filtering algorithm which could also solved the problem that real-time data were not processed by the EMD.