DENVER, April 8 (UPI) -- Lockheed Martin (NYSE:LMT) said this week its new U.S. Air Force GPS satellites carry anti-jamming capabilities.

The company said in a statement Monday that each of its new Global Positioning System IIR-M satellites now carries an upgraded antenna panel that gives them boosted signal power when they transmit to stations on the ground.

The new satellites -- three of which have been successfully launched and deployed in the past six months -- are also equipped to transmit two new military signals to increase their accuracy. They also carry new improved encryption/coding and anti-jamming equipment, Lockheed Martin said.

The GPS satellites are equipped with a second civil signal that will give users an open access signal on a different frequency, the company said.

The Global Positioning System gives its users the capability to ascertain the exact time, speed and location of their vehicles, including precise details on their latitude, longitude and altitude to within a few yards, the company said. The U.S. Air Force Space Command's 2nd Space Operations Squadron -- 2 SOPS -- directs and runs the system of orbiting GPS satellites for both their civilian and armed forces clients.