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介绍美国部署的全球定位系统的总体情况,并指出其存在的安全问题;概述美国为迎接导航战时代的到来所采取的近期措施和正在研究的可能采用的手段。
It introduces the global situation of the GPS deployed in the United States and points out its existing security problems. It outlines the recent measures taken by the United States to meet the arrival of the navigable war era and the possible measures it is studying.