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实用的导航星星座,由24颗卫星组成,分别安置在三条圆形轨道上,轨道高度为20,450公里。预计到2000年一共用航天飞机发射76颗导航星卫星。据目前估计,到2000年,建成并维持整个导航星全球定位系统的费用是八十六亿五千万美元,其中方案论证费为三亿六千五百万美元;全尺寸工程研制费为八亿四千万美元;生产费为七十四亿四千五百万美元。生产费其中包括:卫星费用二十六亿八千六百万美元;发射费
The practical navigation constellation, consisting of 24 satellites, is housed in three circular orbits with a track height of 20,450 km. It is estimated that by the year 2000, a total of 76 spacecraft will be launched. It is currently estimated that by the year 2000, the cost of completing and maintaining the entire navigation satellite global positioning system will be 8.65 billion U.S. dollars, of which the justification for program justification will be 365 million U.S. dollars. The full-size project development fee will be eight Four hundred million dollars; production costs of 74.45 million dollars. Production costs include: $ 2,668 million for satellite costs; launch fee