据美国白宫官员宣称,美国政府将继续资助全球定位系统,并向国际免费开放,且不附带其他商业限制。这一政策解除了使该系统长期以来不能广泛用于民用的桎梏。据专家估计,到2000年它将为美国接收设备和服务带来84亿美元的市场。 美国空军在70年代就制定计划建造全球定位系统。它是由24颗人造卫星组成,轨道高度达1.7万公里。这一系统在海湾战争中发挥 According to U.S. White House officials, the U.S. government will continue to subsidize the Global Positioning System and be open to the public free of charge and without other commercial restrictions. This policy lifted the shackles that made the system unusable for civilian use for a long time. Experts estimate that by the year 2000 it will bring a market of 8.4 billion U.S. dollars to receiving equipment and services in the United States. The United States Air Force planned to build a global positioning system in the 1970s. It is composed of 24 satellites, orbital altitude of 17,000 km. This system was played in the Gulf War