Study On WSN Localization Technology Based On ZigBee

The earliest produced from military technology, but with the development of the social demands, now positioning technology has been widely applied on environment monitoring, target tracking and battlefield monitoring, forest fire prevention. GPS of United States and the GLONASS technology of Russian is currently the world's most mature and comprehensive, global positioning navigation system. Both positioning technology in the current most widely used, but there are some deficiencies and shortcomings. In a similar underground mines and a lot of indoor positioning special, special environment, global positioning system satellite class is not able to fully play its role, or simply can not play their positioning. There is a demand would have a market, there are problems there will be a solution. This can be used when positioning technology based WSN to make up for the deficiencies and shortcomings of satellite positioning.Promotion in the market, in order to facilitate the realization of WSN positioning and application, ZigBee technology and thrive appears. ZigBee technology mainly to provide local area network communication, self-organizing ability of the communications protocol. Implementation of this technology to highly integrated chip-based positioning. These highly integrated modules, highly integrated network and the WSN positioning required to achieve a variety of chips. ZigBee in hardware greatly facilitate the realization of positioning. This ZigBee based on the positioning of the node module CC2430 were brief, and designed a typical node circuit.Positioning function of the realization, not only based on hardware support, also need location algorithm for computing the mapping results. The algorithm is now used to locate a wide variety, have their own advantages. Location algorithm can be divided into macro and not based on measurement of the distance measurement from the two. In this paper, based mainly introduces the characteristics of WSN-based ranging RSSI, TO A, TDOA, AOA and other typical location algorithm. WSN energy consumption in the adaptation, the use of the premise of environmental characteristics, a new localization algorithm, not only solves the problem of the two intersections of TDOA algorithm, and improves the positioning accuracy.In this thesis, the author makes the following works:1) The wireless sensor structure and how to construct wireless sensor net are studied; the application and advantages is described and the wireless sensor broad application prospects is analyzed.2) The four localization algorithms, based on measuring the distance, are analyzed. Meanwhile wireless sensor network characteristics are studied, two suitable algorithms are selected for wireless sensor network location algorithm, based on the learning and research of the four algorithm.3) A deep research for wireless sensor algorithm based on measuring distance is done, and raise a new algorithms by combining the two selected algorithm, and then the new algorithm is performance simulation. The new algorithm is compared with the selected single algorithm, and gets a conclusion that it has a distinct advantage, such as location accuracy.4) The positioning system realization based on ZigBee technology of wireless sensor network is made a preliminary study. And the locating realization of wireless sensor network positioning system applications is introduced simply.