Lockheed Martin Corp recently delivered the 8th and final satellite in the modernized Global Positioning System Block IIR, or GPS IIR-M, production program to the Air Force. The final spacecraft, designated Block IIR-M, was modernized to augment operations and navigation signal performance for military and civilian GPS users throughout the world.
Presently, there are 3 IIR-M spacecrafts on-orbit, in addition to twelve original Block IIR satellites within the overall 30-spacecraft GPS constellation. The company stated the GPS constellation makes available critical situational alertness and precision weapon guidance for the military. The global system is also claimed to give support to a large array of civil, scientific and commercial functions, from air traffic control to the Internet, with precision location and timing information.
Founded on the navigation user range error, which gauges GPS accurateness, the Block IIR satellites allow accurately outfitted users to find out precise time and velocity and global latitude, longitude and altitude to within one meter, noted by the company.


















