DoD to Discontinue Selectiv Availability of GPS Signals

摘要

The U.S. Department of Defense (DoD) announce on September 18 that it intends to stop procuring Cobal Positioning System (GPS) satellites with the capability to intentionally degrade the accuracy of civil signals. This capability, known as Selective Availability (SA will no longer be present in the next generation of GPS sateless Although the United States stopped the intentional tradation of GPS satellite signals by setting SA levels to z in May 2000, this action to permanently remove SA eliminable a source of uncertainty in GPS performance that has been concern to civil GPS users around the world for some once While this action will not materially improve the perfomence of the system, it does reflect the United States' strong mitment to users by reinforcing that this global utility ,be counted on to support peaceful civil applications around the globe.