阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 ' p7 {2 T. N% h
China to help Europe develop GPS rival
; {+ K& R3 M* Z, u China is to contribute to a new global satellite navigation system being developed by European nations. The Galileo satellite system __1__ a more accurate civilian alternative to the Global Positioning System (GPS), operated by the US military, China will provide 230m Euros(USD 259 m)in __2__ and will cooperate with technical, manufacturing and market development. "China will help Galieo to __3__ the major world infrastructure for the growing market for location services," said Loyola de Palacio, EU transport commissioner. A new center that will coordinate co-operation was also announced __4__ the European Commission, the European Space Agency (ESA) and the Chinese Ministry of Science and Technology not long __5__. The China-Europe Global Navigation Satellite System Technical Training and Cooperation Center will be __6__ at Beijing University. China has a substantial satellite launch industry and could potentially help launch the Galieo satellites.
% K* P" Z* ], H9 v The US has claimed that Galileo could interfere __7__ the US ability to downgrade the GPS service during military conflicts. European officials say this is unfounded and counter that US opposition __8__ the commercial challenge Galileo would present to GPS. Galileo will be precise to within meter, while the civilian GPS service is accurate to around 10 meters.
8 ^( ]* n, p) j% A1 r* I7 X$ n The Galileo satellite constellation will __9__ 27 operational and three reserve satellites orbiting the Earth at an altitude of 23,600 km. 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 __10__ around 3.2 billion Euros (USD 3.6 billion) .
1 ?: \. m. c" n9 f The European Commission has said Galileo will primarily be used for transportation technology, scientific research, land management and disaster monitoring.
0 S1 X3 R% T3 l5 u Galileo will provide two signals: a standard civilian one and an encrypted, wide-band signal __11__ the Public Regulated Service (PRS). This second signal is designed to withstand localized jamming and will be used by police and military services in Europe. European Commission __12__ have said China will not be given access to the PRS. - \/ Y$ n1 @9 {" w4 ~- x3 a
The first Galileo satellite is scheduled to launch late in 2004. Clocks on board __13__ will be synchronized through 20 ground sensors stations, two command centers and 15 uplink stations. 7 m# F. T- f4 m0 n
Receivers on the ground will use time signals from the satellites to precisely calculate their __14__. A "search and rescue" function will also __15__ distress signals be relayed through the constellation of satellites. ! U& I) }& C G- [+ K2 ]5 s
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发表于 2012-8-16 00:07:50
