Advanced radar designers at the Northrop Grumman Corp. Electronic Systems segment in Linthicum, Md., will build and flight test a prototype imaging radar system that enables U.S. aircraft to engage maneuvering ground targets through clouds, dust, and other obscurants. Northrop Grumman is doing the work under terms of a $5.6 million contract from the U.S. Defense Advanced Research Projects Agency (DARPA) in Arlington, Va., for the Video Synthetic Aperture Radar (ViSAR) System Design and…