JSTARS
In the mid-1970s, DARPA and the U.S. Air Force jointly developed an airborne target-acquisition and weapon-delivery radar program, Pave Mover, under the Agency’s Assault Breaker program. The Pave Mover system relied on even earlier DARPA-sponsored research into moving target indication (MTI) radar for detecting slowly moving targets. As the program progressed, researchers added a synthetic aperture radar (SAR) to analyze areas for which the MTI radar could not detect a moving target, as well as capabilities for detecting helicopters and even rotating antennas.