US Department of Defense, LOS ANGELES AIR FORCE BASE: Government officials, representing military and civil interests, recently emphasized the need for continued modernization of the Global Positioning System.
Air Force Space Command is making steady progress to deliver modernized satellites, ground control systems and military-user equipment.
The GPS program continues to develop and field new capabilities for the warfighter and civil users, according to Navstar GPS Joint Program Office officials.
The years following the first and subsequent launches of Block I GPS satellites identified the need for continued development and improvements in the existing system. The first 11 satellites, launched between 1978 and 1985, demonstrated the value of GPS technology.
These early missions led to the development and launch of a series of operational Block II satellites that included a signal for civilian use, launched in 1989. Additional Block IIA GPS satellites were launched in the early 1990s to complete the GPS constellation, allowing AFSPC to declare full operational capability on April 27, 1995.
Normally, the GPS constellation consists of 24 satellites and associated operational
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