New generation GPS satellite starts tests in Colo.

DENVER (AP) ? A prototype of the next generation of GPS satellites has arrived in Colorado for testing at Lockheed Martin.

The new satellites are expected to be more accurate for military and civilian users. They also pack a stronger radio signal, making it harder for enemies to jam and easier for receivers to tune in.

The prototype arrived at the Lockheed Martin complex south of Denver on Monday. It won’t be launched, only tested. The first launch is scheduled for 2014.

Lockheed Martin has a $1.5 billion Air Force contract to build and test the prototype and build the first two satellites for launch. The contract includes an option for two more satellites.

The Pentagon expects to buy and launch 32 total.

Lockheed Martin is based in Bethesda, Md.