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Limao Escreveu:Desculpem-me a ignorância sobre este assunto, mas traduzindo para miúdos, o que é nos vai trazer na prática? Isto é bom ou mau?...
TMPinho Escreveu:Boas,
Daquilo que li, não vai servir só para obtermos as posições (lat,long, alt, vel.).
Vai servir para enviar conteúdos, é do género estamos a chegar a um sítio e é enviada informação (tipo: bombas, restaurantes, museus, trânsito, etc.) desse local.
Isso foi o que li no inicio do projecto Galileu. Não sei se entretanto com estas alterações todas, houve alguma mudança.
Abraço :)
What is GALILEO?
GALILEO is a global navigation infrastructure under civil control. It will consist of 30 satellites, the associated ground infrastructure and regional/local augmentations.
Why is there any need for GALILEO when we already have GPS?
GALILEO will ensure European economies' from independence from other states’ systems, which could deny access to civil users at any time, and to enhance safety and reliability. The only systems currently in existence are the United States Global Positioning Service (GPS) and the Russian GLONASS system, both military but made available to civil users without any guarantee for continuity.
Important macro-economic benefits will be derived from GALILEO, in particular through achieving a European share in the equipment market, efficiency savings for industry as well as social benefits e.g. through cheaper transport, reduced congestion and less pollution.
Above that, with it's open service at least offering the same performances as GPS by the time of GALILEO's deployment, GALILEO will offer also value added services with integrity provision and, in some cases, service guarantees, based on a certifiable system.
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Why should I pay for GALILEO, when GPS is free?
Like GPS, GALILEO will be free of charge to basic users (open service). Some applications will have to be paid for - those requiring a quality of service which GPS is unable to provide. The GPS of the future could perhaps offer such services too, but there is no guarantee that they will be free, least of all if GPS would hold a monopoly. In any case, GPS will remain a system conceived primarily for military applications.
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Will existing GPS receivers be able to use GALILEO?
Negotiations with U.S. administration are currently focusing on the shared use of certain frequency bands. The future for the navigation receiver user should be seen in the combined GPS / GALILEO receiver that will be capable of computing signals from both contellations (GPS + Galileo). This will provide for the best possible performance, accuracy and reliability. However, since Galileo will not be available before 2008, current GPS-receivers will most probaly not be able to receive Galileo-signals. It remains to be seen if industry will be able to provide software-updates, for example. On the other hand, given the advance in technological development, today's GPS-receivers would probably anyway be outdated in 5 or 6 years from now. It should also be noted that, as GPS is foreseen to evolve, "old GPS-reveivers" will face the same difficulties with future upgraded GPS-signals.
Malok0 Escreveu:recuso-me a tecer qualquer comentário seja no sentido depreciativo ou vice-versa.
Ainda é cedo para dizer se o GPS ficará sobrelotado e com a sustentabilidade em risco, e se o Galileo uma boa opção.
rifkind Escreveu:http://www.space.com/businesstechnology/080505-busmon-china-beidou.html
Chinese satellite navigation officials say they intend to field an operational system covering all of Asia by 2010, but they are giving few details on the deployment plans for their global system. In addition China has yet to complete frequency coordination with the United States, Europe, Russia and others.
In presentations April 23 here at the Toulouse Space Show, these Chinese officials nonetheless said their global Compass/Beidou system would be fully compatible with the U.S. GPS, European Galileo and Russian Glonass global navigation constellations.
Like GPS, Galileo and Glonass, Beidou/Compass would be free of direct user charges but also feature an encrypted signal for authorized users only, presumably including the Chinese military.
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