Research On WSN Location Technology Based On Zigbee

Wireless sensor networks (WSN), which integrate technologies of embedded computing, distributed information processing and wireless communication, lead to a new pattern of information gathering and processing. The fundamental problems of sensor networks are deployment, coverage, locations and networking protocols. And location, which has been focused as a basic problem, is the precondition of many applications of sensor networks. The WSN node location technology based on Zigbee protocol is studied in this paperFirst of all, on the basis of analyzing the traits and structure of WSN, the paper shows the main content of Zigbee protocol and its application on the construction of WSN. Then the paper also elaborates that with the advantages of low power, low cost and low rate, Zigbee technology has been the one of very hot wireless communication technology, and has many sound applications such as industry control and intelligent indoor, etc.Secondly, the several mainstream node location algorithms of wireless sensor network have been discussed. The categories and performance evaluations are also analyzed. The anchor-free location (AFL) algorithm is focused on relative to anchor-base location. Especially, for avoiding local minimum, the paper establish a fold-free graph, and then get a global minimum by using a mass-spring optimization. By these phases, a globally rigid network will be achieved.Finally, the AFL location technology is achieved in the practice application of the noise monitoring system. The wireless sensor network is established with the node of CC2430 communication chip on the software develop environment of IAR. The simulation results show that the network node can be well located with good precision with AFL algorithm.