“全球定位系统”(GPS)的大名大家已是耳熟能详,无论在军用领域还是民用领域,其地位越来越重要。美军参联会主席甚至说:如果没有GPS系统的支持,美军甚至连一场战斗都无法取胜,更谈不上打赢一场战争了。GPS军用信号历来只为美国及其盟国所使用,而其他国家只能使用精度很低的民用信号,但是今年5月1日美国总统克林顿却 The name of “GPS” is well known to everyone, and its status is becoming more and more important both in military and civilian areas. The president of the U.S. Army Senate even said: Without the support of the GPS system, the U.S. military can not even win one battle, let alone win a war. GPS military signals have traditionally been used only by the United States and its allies, while other countries can only use civilian signals with low accuracy. However, on May 1 this year, U.S. President Bill Clinton