The Galileo satellite constellation will 59 27 operational and three reserve satellites orbiting the Earth at an altitude of 23,600km. The satellites will be strung along three medium-Earth orbits at 56 degrees inclination to the equator and will provide global coverage. The system should be operational by 2008 and the entire project is expected to 60 around 3.2 billion Euros .

　　The European Commission has said Galileo will primarily be used for transportation technology, scientific research, land management and disaster monitoring.

　　Galileo will provide two signals: a standard civilian one and in encrypted, wide-band signal 61 the Public Regulated Service . This second signal is designed to withstand localized jamming and will be used by police and military services in Europe. European Commission 62 have said China will not be given access to the PRS.

　　The first Galileo satellite is scheduled to launch late in 2004. Clocks on board 63 will be synchronized through 20 ground sensors stations, two command centers and 15 uplink stations.

　　Receivers on the ground will use time signals from the satellites to precisely calculate their 64 A search and rescue function will also 65 distress signals be relayed through the constellation of satellites.

　　51

　　A offer

　　B offered

　　C will offer

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