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全球定位系统美国国防部花费３０亿美元，由位于洛杉矶空军基地的空军系统指挥部空间局的联合计划办公室研制成功的“全球定位系统”（按英文缩写，简称为ＧＰＳ），是一个以卫星为基础的全天候无线电定位、导航和时间传递系统。ＧＰＳ由２４颗卫星组成，它们均匀地分布在...
Global Positioning System The US Department of Defense spends US$3 billion on a Global Positioning System (abbreviated as GPS) developed by the Joint Planning Office of the Air Force System Command and Space Agency at Los Angeles Air Force Base. It is a satellite-based system. Basic all-weather radio positioning, navigation and time delivery system. GPS consists of 24 satellites that are evenly distributed in...