An Iterative Method Of Processing Node Flip Ambiguity In Wireless Sensor Networks Node Localization

In order to solve the problem of node flip ambiguity generated by using classical least squares method in wireless sensor networks node localization, an iterative method based on triangular node blocks to process node flip ambiguity is proposed in this paper. At first, orthogonal projection detection method is adopted to detect the unknown node needed to be positioned. If the node would be detected to have a flip ambiguity, based on the stability of the triangle node blocks and the whole network connectivity information, the flip ambiguity node is processed by the iterative method based on coordinate transformation and recursive optimization, so the process can detect and correct the problem of node flip ambiguity generated by using the least squares method. Otherwise, if the unknown node does not have a flip ambiguity, the node is also positioned using the least squares method. The simulation results show that the proposed method not only can effectively deal with the problem of node flip ambiguity generated by using the least squares method, but also reduce localization errors and improve localization accuracy.