"Instead of jamming radar signals, Suter uses a more sophisticated approach of "hacking" into enemy defences.

"The technology allows users to invade communications networks, see what enemy sensors see, and even take over as systems administrator so sensors can be manipulated into positions so that approaching aircraft can't be seen," Aviation Week explains. "The process involves locating enemy emitters with great precision and then directing data streams into them that can include false targets and misleading message algorithms."

Article Link: http://www.theregister.co.uk/2007/10/04/radar_hack_raid/