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Study on GPS-based portable field rescue positioning system

The paper presents a GPS-based positioning method mainly used to field rescue. The position and orientation of the rescuer and the trapped are acquired using GPS chip and digital compass. Using the GPS data and compass data, the relative distance and orientation between them are calculated from the geometric relationships based on a series of formulas in Geographic Information Science (GIS). Using this technology, we develop a solar-powered portable field-rescue device. The experiments prove that the device can do accurate coordination via wireless communication, helping rescuers to search the trapped more accurately and quickly.