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发帖数: 223 | 1 http://www.gao.gov/products/GAO-09-670T
Global Positioning System: Significant Challenges in Sustaining and
Upgrading Widely Used Capabilities
GAO-09-670T May 7, 2009
Highlights Page (PDF) Full Report (PDF, 15 pages) Accessible Text
Summary
The Global Positioning System (GPS), which provides position, navigation,
and timing data to users worldwide, has become essential to U.S. national
security and a key tool in an expanding array of public service and
commercial applications at home and abr |
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