No abstract

No abstract

No abstract

The localization problem is a key supporting technology in wireless sensor network (WSN). The performance of commonly used positioning algorithms in WSN in terms of node density, beacon node ratio and different terrain is firstly analyzed and compared in this paper. The analysis shows that the magnitude of the positioning error of the trilateration method based on the received signal strength indicator (RSSI) ranging technology is 10 −15 , which is far lower than other positioning algorithms, but the node proportion that cannot be located is 20%-50% or so, which is much higher than other algorithms. Therefore, an improved trilateration positioning method based on RSSI ranging (ITRSS) is proposed, that is, the unknown nodes that have been located is used as new beacon nodes to locate other unknown nodes. MATLAB simulation shows that the positioning error of the proposed ITRSS method is only reduced by an order of magnitude, moreover, the proportion of nodes that cannot be located is reduced to about 1%, which is only some remote individual node out of the communication range in the area. The Zigbee network established by the CC2530 chip is used for preliminary experimental verification. The experimental results show that the nodes that could not be located at first can be located, and the positioning error does not exceed the set threshold of 3 m. Thus shows the proposed ITRSS method is of feasibility and effectiveness, which help to improve the positioning capability of the entire WSN network.

No abstract