The Northrop Grumman RQ-4 Global Hawk is a Remotely Piloted Aircraft (RPA) used by the United States Air Force and Navy as a surveillance aircraft. This type of aircraft is generally known as an Unmanned Aerial Vehicle, or UAV.
In role and operational design, the Global Hawk provides battlefield overview and systematic target surveillance. The Global Hawk is able to provide high resolution Synthetic Aperture Radar (SAR)—that can penetrate cloud-cover and sandstorms— and Electro-Optical/Infrared (EO/IR) imagery at long range with long loiter times over target areas. It can survey as much as 40,000 square miles (100,000 square kilometers) of terrain a day.
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