Design And Realization Of Zig Bee-based Indoor Positioning Monitor System

With the wide application of wireless network technology,the rapid development of low-power embedded technology and mobile communication technology,wireless indoor location monitoring needs are also larger,especially in complex indoor environments,such as large office buildings,large parking lots,exhibition halls,apartments for the elderly,and even places with a high security level,like,mine construction sites.In the event of emergency situations to take urgent security measures,access to the position information of the indoor targets plays a vital role in mastering the situation of persons and goods in the room.ZigBee protocol is a short-range low-power local area network protocol based on the IEEE 802.15.4 wireless network standard.ZigBee-based indoor positioning has great application requirements and commercial potential.Received signal strength indicator method(RSSI)is a ZigBee-based indoor location positioning method,which can get the node spacing based on the relationship of the attenuation of the received signal strength and the signal transmission distance.By using range-based localization algorithm,considerable positioning accuracy can be obtained at relatively low cost and power consumption.However,due to the uncertainty of the indoor environment complexity,the stability and accuracy of indoor positioning method has always been a bottleneck of the method developing for practical applications.This paper designed and realized a whole set of indoor positioning monitoring system,include CC2530-based wireless sensor network nodes,STM32-based positioning data collector and the PC location monitor client software.The mobile node in the wireless sensor network broadcasts timestamp information periodically to the surrounding environment,and the location node obtains the broadcast signals of mobile node,extracts out the RSSI value,and transmits the positioning information to the data collector by multi-hop mode.The positioning data collector is connected to the PC via Ethernet and all the collected RSSI values and other location information are uploaded to the computer monitoring client software.By performing the C language transplantation and optimization of the existing algorithms,the computer monitoring client software can achieve the goal of real-time indoor mobile target positioning.This paper can obtain a considerable indoor positioning accuracy under complex circumstances and conditions.