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Satellite Navigation Systems Need Coordination

机译：卫星导航系统需要协调

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Europe and the United States, perhaps along with Russia, India and Japan, must find a way to coax China into being more forthcoming about plans for its Compass/Beidou satellite navigation system, whose development appears to be moving more quickly than expected. If China's ambitious deployment schedule holds, Compass/Beidou would be in service well before Europe's planned Galileo satellite navigation constellation. European officials are worried that Compass/Beidou's encrypted signal will operate in a frequency range that overlaps with Galileo's restricted-access Public Regulated Service. If that turns out to be the case, Europe would not be able to jam the Compass/Beidou system's most accurate signals during an emergency without also blocking the Public Regulated Service in the affected area. Galileo posed the same potential problem for GPS 3, the next-generation U.S. satellite navigation system; the issue was resolved only after years of often contentious negotiations between the two sides. Europe now faces a similar parley with China, an already difficult prospect made even more daunting by Europe's almost complete lack of insight into Beijing's Compass/Beidou plans.
机译：欧美，也许还有俄罗斯，印度和日本，必须找到一种方法来诱使中国更加积极地研究其北斗/北斗卫星导航系统的计划，该系统的发展似乎比预期的要快。如果中国雄心勃勃的部署时间表得以维持，北斗/北斗将在欧洲计划中的伽利略卫星导航星座之前投入使用。欧洲官员担心，指南针/北斗的加密信号将在与伽利略的受限访问公共管制服务重叠的频率范围内运行。如果真是这样，欧洲将不能够在紧急情况下阻塞北斗/北斗系统最准确的信号，而又不会阻塞受影响地区的公共管制部门。伽利略对下一代美国卫星导航系统GPS 3提出了同样的潜在问题。两国之间经过多年的有争议的谈判才解决了这个问题。欧洲现在面临着与中国相似的困境，由于欧洲几乎完全缺乏对北京的指南针/北斗计划的洞察力，本来就已经很困难的前景变得更加令人生畏。

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    《Space news》 |2009年第4期|p.18|共1页
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  • 中图分类 航空、航天;
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