The Global Positioning System Reviews of Lower Cost Modernization Efforts and Risk Mitigation of GPS Disruptions

The GPS -- a space-based satellite system that provides positioning, navigation, and timing data to users worldwide -- has become an essential U.S. national security asset and component in daily life. The GPS program is being modernised to enhance its performance, accuracy and integrity. This book assesses the extent to which the Air Force GPS report met Committee requirements; and identifies additional information that is important in guiding future GPS investments.