The propulsion core for the first next-generation GPS 3 timing and navigation satellite Lockheed Martin Space Systems is building for the U.S. Air Force has been delivered to the company’s Denver-area GPS Processing Facility, Lockheed Martin announced Sept. 24.

The propulsion, which will serve as the structural backbone of the satellite, was developed and tested at Lockheed Martin’s Mississippi Space & Technology Center.

Keoki Jackson, Lockheed Martin vice president of navigation systems, said in a statement that the first of at least four GPS 3 satellites the company is building under a 2008 contract will be completed in time for a 2014 launch.