Abstract
With the comparison of wireless positioning technology such as Wi-Fi, ZigBee, GPS, this paper presents an outdoor personnel positioning system based on GPS. It is composed of electronic wristbands (used for detainees), handsets (used for supervisors) and monitoring software of the host computer. In order to improve the positioning accuracy and reduce power consumption of the system, high-precision GPS chips and low power microcontroller chips are applied. Handsets can exchange data with electronic wristbands through self-prepared communication protocol. It also can work out the distance through a precise latitude and longitude distance algorithm. Finally, the monitoring software will reproduce personnel routes in Google Earth. The system can achieve the positioning of fixed groups and moving groups, which is suitable for the detention center to supervise, escort or chase detainees.
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