An Improved Location Algorithm Based on Mobile Anchor Node

Aiming at the problem that the beacon signal of SCAN algorithm can not effectively cover the monitoring area and the mobile node of PI algorithm has longer moving path, an improved mobile anchor node localization algorithm-SCAN_ET is proposed in this paper. Firstly, this algorithm divides the region where nodes need to be located into several small zones. Then it's key step is that-the mobile anchor node detects whether there are unknown nodes that need to be positioned in each local small zones. If there are unknown nodes to be located in some small zones, the mobile anchor node moves along the sides of triangular in these zones and broadcasts beacon packets at all the vertices of the triangle. Otherwise, the mobile anchor node moves in a straight line in these zones. Finally, when the mobile anchor node traverses the regions, all unknown nodes that need to be positioned also complete positioning. Simulation results show that by this method, not only can all the unknown nodes obtain the location information effectively, but also the mobile anchor node has a shorter traversal length compared with PI algorithm and LMAT algorithm, which is good for saving energy and prolonging service life.