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美国卫星测位公司把利用卫星测位/通信作为它的商业目标,已于1988年6月正式开始营业。该公司的用户只有500家,而且不拥有专用卫星。该公司预测,一年半后的用户数量可增长100倍,1989年该公司卖出
U.S. satellite positioning companies have used satellite positioning/communication as their commercial target, and have officially started operations in June 1988. The company has only 500 users and does not have dedicated satellites. The company predicts that the number of users after one and a half years will increase by 100 times. In 1989 the company sold