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  • DoD to Stop Using SA-Enabled GPS Satellites
Sep 2007
The Department of Defense announced it intends to stop procuring global positioning system (GPS) satellites with the ability to intentionally degrade the accuracy of civil signals. This capability, known as selective availability (SA), will no longer be used in the next generation of GPS satellites. "Although the US stopped the intentional degradation of GPS satellite signals by setting SA levels to zero in May 2000, this action to permanently remove SA eliminates a source of uncertainty in GPS performance that has been of concern to civil GPS users worldwide for some time," the DoD said in a statement. "While this action will not materially improve the performance of the system, it does reflect the United States' strong commitment to users by reinforcing that this global utility can be counted on to support peaceful civil applications around the globe." The decision to remove the capability from next-generation GPS satellites was approved by the president after a recommendation from DoD. The move coincides with the Air Force's solicitation to purchase the next generation of GPS satellites, known as GPS III.

The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
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