Abstract: The convex localization algorithm is a range-free positioning algorithm in wireless sensor networks.In order to solve the problem of low positioning accuracy caused by the large overlap area and the irregularity of the region in the traditional convex localization algorithm,an improved localization algorithm was proposed,which uses the combination of multiple communication radius and RSSI to reduce the unknown node area and use the angle to correct the irregular area.The improved algorithm introduces multiple communication radius to broadcast multiple times to refine the area where the unknown node on the basis of the traditional convex algorithm,and then uses the RSSI to reduce the area,and finally obtains the polygon region using the angle correction as the positioning result.The simulation results show that the improved algorithm can effectively reduce the positioning error and improve the positioning accuracy compared with the original algorithm.

Key words: Angle correction, Convex, Multiple communication radius, RSSI, Wireless sensor network