美国国防部将调整全球定位系统的研制计划,即通过推迟该系统具备初步工作能力的日期和减少初期导航星座中的卫星颗数(从24颗减少到18颗),来降低该系统的经费。而全球定位系统星座中的卫星数目以后将不断增加。负责通信、指挥、控制和情报的国防部长助理G·P·迪宁最近透露,目前正在研究几个可供选择的调整方案,预期不久即将作出决定。由于初期导航星座中卫星颗数的减少,地球上任何地方的用户通 The U.S. Department of Defense will adjust the Global Positioning System development plan to reduce funding for the system by delaying the system’s initial ability to work and by reducing the number of satellites in the initial constellation of pilots (from 24 to 18). In the future, the number of satellites in the constellation of GPS will continue to increase. DG Dein, assistant secretary of defense for communications, command, control and intelligence, said recently that several options for adjustment are currently under study and is expected to be decided shortly. Due to the reduction in the number of satellites in the initial navigation constellation, users anywhere in the world are on