The U.K.'s National Air Traffic Services awarded Raytheon Co. a contract to conduct software modeling and field trials of technology that minimizes the effects of wind turbines on radar signals. Wind farm turbines create a Doppler effect as they rotate, creating a potential radar blackout zone. The Raytheon solution uses hardware and software to detect the turbines on radar systems, eliminating interference with radar displays. Under the $6.5 million contract, Raytheon will develop and test advanced mitigation algorithms within its S-band approach and L-band en route primary surveillance radars. System testing will take place in the U.K. and the Netherlands.