br220继电器参考资料.pdf

BR-220 February 2004 S I M E T R A PAVING THE WAY FOR EUROPE’S FUTURE DATA-RELAY LAND-MOBILE AND NAVIGATION SERVICES ARTEMIS Paving the way for Europe’s future data-relay, land-mobile and navigation services Technological breakthroughs, a World premiere in space, European engineers rising to meet the meet the challenge of a launch malfunction – these are the Artemis achievements. Artemis is ESA’s latest telecommunications satellite. It is the most advanced communications satellite yet produced by the Agency, being designed both to test and develop new areas of mobile communication, and to initiate a European data-relay system involving satellite-to-satellite communication. It is ESA’s contribution to advancing the use of satellite communication systems for land transport, air and sea navigation, and is acting as a new inter-orbit link between satellites in low Earth orbit and the ground. Having reached its final orbital position on 31 January 2003, Artemis soon began delivering its planned data- relay, land-mobile and navigation services. In particular, its L-band land mobile payload is being used to complement and augment the European Mobile System, its data-relay payloads are being prepared to provide operatio