Abstract
In the previous paper, we proposed and evaluated a worldwide usable rescue system, which was based on the use of the mobile device combining the GPS unit and the satellite communication unit. However, the system was not practically applicable because the problem of the size reduction of the mobile device remained unresolved. In this paper, we proposed a new rescue system, which was based on the use of a special low-power transmitter. According to the statistics by Japan Coast Guard, two thirds of man-overboard accidents occurred near by own vessels or in the inshore area. Therefore, we propose a relay system for indirect sending of the SOS signal from the victim through the vessel or the onshore equipment. Realization of the system ensures the size reduction of the mobile device, which performs only the startup function of the relay unit, while the GPS and the satellite communication unit are integrated into the relay unit. The experiments have been carried out at the lake area, inshore area and offshore area. As a result, the special low-power transmitter is able to activate the relay unit in the range of 1, 000m. The proposed rescue system is characterized with the high practical applicability due to the size reduction of the mobile device.
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