A Delta 2 rocket lofted a Global Positioning System (GPS) satellite from Cape Canaveral Air Force Station in Florida on November 6 – adding a new member to a constellation of similar spacecraft that circle Earth.

After a roughly four week checkout, the GPS satellite -- designated GPS IIR-13 – will bring to 30 the number of on-duty GPS spacecraft and signals a history-making milestone for the program. According to U.S. Air Force officials that operate the system, having so many GPS satellites functioning at the same time will be a first.

The GPS is a world-wide navigation system for both military and civilian users. Using portable devices on the ground, a GPS user can determine precise time and velocity and worldwide latitude, longitude and altitude to within a few feet.

As a newcomer to the GPS constellation, this latest satellite is destined to replace one of the earlier spacecraft in the series launched in 1991. That satellite continues to work, although it has passed its life expectancy.

Lockheed Martin built the new-generation GPS IIR spacecraft. The firm is also working on the U.S. Air Force’s next generation GPS III satellite that will offer improved capabilities.

Credit: U.S. Air Force/Carleton Bailie

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