Final GPS Block IIR Sat Delivered

Lockheed Martin delivered the eighth and final satellite in the modernized Global Positioning System Block IIR (GPS IIR-M) production program to the Air Force.

There are three IIR-M spacecraft on-orbit, along with 12 original Block IIR satellites within the overall 30-spacecraft GPS constellation.

Each satellite in the Block IIR-M series includes a modernized antenna panel that provides increased signal power to receivers on the ground; two new military signals for improved accuracy, enhanced encryption and anti-jamming capabilities for the military; and a second civil signal that will provide users with an open access signal on a different frequency.

Based on the navigation user range error, which measures GPS accuracy, the Block IIR satellites enable properly equipped users to determine precise time and velocity and worldwide latitude, longitude and altitude to within one meter.

The third GPS IIR-M spacecraft was launched Nov. 17 and was declared operational Dec. 12 by the Air Force Space Command 2nd Space Operations Squadron (2 SOPS) at Schriever Air Force Base, Colo., which manages and operates the GPS constellation for both civil and military users.

The fourth GPS Block IIR-M satellite has been delivered to Cape Canaveral to support a launch late this year. Remaining satellites delivered to storage are available for launch when requested by the Air Force for constellation sustainment.