
The Global Positioning System (GPS) program, established in 1973, needs to launch four Lockheed Martin [LMT] GPS III satellites with the L5 signal in short order to help counter adversary jamming and spoofing of GPS signals, positioning, navigation, and timing experts say. A constellation of 18 to 21 GPS satellites with the L5 band are to have 30 times the anti-jamming of the 31 orbiting GPS satellites with the weaker L1 signal, but four GPS satellites with the L5 band…