BALTIMORE, Feb. 12 -- Northrop Grumman Corp.'s Systems Development and Technology Div. has been awarded a contract by the Defense Advanced Research Projects Agency to design, build and conduct a proof-of-concept airborne demonstration of a synthetic aperture ladar sensor that generates high-resolution 2- and 3-dimensional imagery. The 27-month contract,for $20 million, will be managed by the Air Force Research Laboratory's Sensors Directorate at Wright-Patterson AFB, Ohio. 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