GPS Block IIR

The GPS Block IIR is an improved version of GPS Block II spacecraft with an automated operation mode independent of the ground control segment. The spherical error probable was cut to 7 meters, the satellite features re-programmable micro-processors and civil/commercial signal was added. Lockheed-Martin Block IIR satellites were launched beginning in 1996 and continuing through 2004. On June 23, 2004, the US Air Force launched successfully the GPS IIR-12 spacecraft aboard a Delta II launch system joining a constellation of 28 operational GPS satellites. GPS IIR-12 is the 11th GPS IIR satellite put into orbit successfully. GPS IIR-13 was put into orbit November 6 2004 totaling 30 satellites on orbit. Lockheed-Martin is developing the GPS IIR-M upgrade that will incorporate two new military signals for enhanced accuracy and a second civil signal on a different frequency to eight existing GPS IIR spacecraft already built and held in storage. In addition, the modernized series will offer a modernized antenna panel that provides increased signal power to receivers on the ground, enhanced encryption and anti-jamming capabilities for the military. The first upgraded GPS IIR spacecraft, designated GPS IIR-M1 or GPS IIR-14 (M), was launched by a Delta II rocket on 25 September 2005 at Cape Canaveral Air Force Station, Florida. Lockheed Martin and the US Air Force cleared the GPS IIR-14 (M) delivering civilian and military signals for operational use on December 19, 2005. The GPS IIR-15(M) was launched successfully by a Delta II rocket on 25 September 2006 from Cape Canaveral Air Force Station, Florida.

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