Research On Location Technology Based On Zigbee And Its Application To Fire-fighting

As a new emerging short-range wireless digital communication network technology, ZigBee, because of its advantages-low cost and low power consumption, has been used in a wide application area, such as wireless location industry, home automation, medical equipment control, environmental monitoring, war, and so on. Although wireless location technology based on ZigBee network is not quite mature, especially that indoor positioning technology of mobile nodes is still not mature enough, but it has caused widespread concern. This dissertation, aiming at wireless sensor networks based on ZigBee, studies indoor positioning technology, and implements an indoor location system of mobile nodes in a simple single-building. The system can effectively improve the safety factor and work efficiency for firefighters, hence impletmenting the inside-building fire alarm.The main contents of this dissertation are as followes. The current situation of the location technology based on ZigBee and the significance of its application in fire fighting were reviewed. This dissertation introduced the protocols of ZigBee technology based on IEEE 802.15.4. Then, some methods of wireless location and several typical positioning systems were analyzed, including their advantages and disadvantages.Based on feasibility analysis, this dissertation proposed a new regional location algorithm with higer positioning precision, of which the improvements include the number of collected data and the choice of data for positioning, and implemented an indoor location system based on ZigBee network. This positioning system includes hardware part and the software platform, and has the two features as follows. (1) The location technology of mobile nodes based on RSSI and the tree topology are chosen and utilized; the visualized monitoring software is developed under the software development environment VS2008. The system's performance was tested on the laboratory condition which is located at a specific level of the building. Experimental reruslts show that the system can not only improve the safety factor of firefighters at work, but also achieve the goal of low cost, low power consumption and easy deployment. (2) Considering the limitation of old positioning algorithms, we proposed a new algorithm and verified that it can improve the regional positioning precision, which has been showed by experiments.