Radar remains one of the most important sensor technologies ever developed for any military platform. Airborne applications are many and varied but broadly divided into: target detection, ranging, tracking, identification, and velocity measurement, along with avoidance, high-resolution imaging, and 3D mapping of terrain. Without doubt, the most important radar technology applied to fighters during the last three decades is electronically scanned arrays, which continue to evolve and may be on the cusp of a leap in performance and a significant reduction in cost with the introduction of gallium nitride (GaN) components.
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