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The basic Cospas-Sarsat concept is illustrated in the adjacent figure.
The System is composed of:
distress radiobeacons (ELTs for aviation use, EPIRBs for maritime use, and PLBs for personal use) which transmit signals during distress situations;
instruments on board satellites in geostationary and low-altitude Earth orbits which detect the signals transmitted by distress radiobeacons;
ground receiving stations, referred to as Local Users Terminals (LUTs), which receive and process the satellite downlink signal to generate distress alerts; and
The Cospas-Sarsat System includes two types of satellites:
The future Cospas-Sarsat System will include a new type of satellite in the medium-altitude Earth orbit (MEO) which will form the MEOSAR System.
Please find more information on https://www.cospas-sarsat.int/en/
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