The Research And Realization Of Indoor Localization System Based On ZigBee Technology

With the rapid development of modern communication technology and wireless network, people's demand for positioning and navigation is increasing.Especially in complex indoor environments,such as the airport hall,exhibition halls,warehouses,supermarket,library, underground parking,mine and so on,in all these cases,the indoor location information of Mobile terminal or its holder,facilities and materials need to be identified.But as the limitation of positioning time,positioning accuracy as well as the complexity of the indoor environment conditions,well-positioning technology is still unable to be used in an encloseure space.The combination of ZigBee technology and localization is one of the key researches.ZigBee technology,based on the IEEE802.15.4 protocol,is a newly developed short range wireless communication technology with the merits of low cost,low power consumption at comparable lower data rate.While the ZigBee technology is more and more frequently adopted in application areas like home automation,telemetering and remote control, mobile automation,medical treatment and so on,the real-time localization in the ZigBee network becomes a hot topic recently.This paper,aiming at ZigBee network,investigates the indoor wireless location techniques and implements a real-time location system with the target use in the office and corridor.Based on numerous measurements,the merits and faults of several applied location methods are summarized.A localization method which is the combination of RSSI and LQI is proposed.This paper achieves a location system,three parts are included.They are hardware platform,communication program of nodes and PC monitor software.The achievement of every part is clear introduced in this paper.The core of hardware platform is CC2430 which is integrated by RF and 51 MCU,the localization nodes are designed and made.It includes RF module,auxiliary module and function indication circuits.In actual applications,Based on the function differences of nodes,different parts of the hardware platform can be selected to achieve corresponding functions.The exploitation of node communication program is based on Z-Stack protocol stack which is provided by TI,The paper introduces the nodes communication flow elaborate.The achievement ways of different kinds of nodes are gave.In Visual c++ 6.0 circumstance,the pc monitor software is compiled,elaborate software solution is proposed in this paper. In the end,practical test is implemented.This system is confirmed to be a good one,it is a low cost and easy achieved system.Aim at the shortage which was found during the test,the method to consummate the function is proposed.