ground signals — A visual signal displayed on an airfield to give local air traffic rules information to flight crews in the air. These signals are displayed in a signal area 12 m2 and bounded by a white border. Such signal areas are located at aerodromes where… … Aviation dictionary
Ground-penetrating radar — (GPR) is a geophysical method that uses radar pulses to image the subsurface. This non destructive method uses electromagnetic radiation in the microwave band (UHF/VHF frequencies) of the radio spectrum, and detects the reflected signals from… … Wikipedia
Signals intelligence operational platforms by nation — This article is a subset article under the main article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with current signals… … Wikipedia
Signals intelligence in modern history — This article is a subset article of the article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with signals intelligence in the… … Wikipedia
Signals intelligence — SIGINT redirects here. For the UNIX signal, see SIGINT (POSIX). RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UK USA Security Agreement. Signals intelligence (often contracted to SIGINT) is intelligence gathering… … Wikipedia
Ground (electricity) — In electrical engineering, ground or earth may be the reference point in an electrical circuit from which other voltages are measured, or a common return path for electric current, or a direct physical connection to the Earth. A typical earthing… … Wikipedia
Signals intelligence by alliances, nations and industries — This article is a subset article under the main article SIGINT, which addresses the unifying conceptual and technical factors in this intelligence discipline. This article describes how the discipline is used by multinational alliances and… … Wikipedia
Ground plane — In electrical engineering, a ground plane is an electrically conductive surface. Radio antenna theory In telecommunication, a ground plane structure or relationship exists between the antenna and another object, where the only structure of the… … Wikipedia
Ground Penetrating Radar — Ein Bodenradar, auch Georadar, engl. Ground Penetrating Radar (GPR) oder Radio Echo Sounding (RES), misst Störungen in den oberen Schichten des Erdbodens durch Reflexion elektromagnetischer Strahlung. In der Geophysik dient es zur Untersuchung… … Deutsch Wikipedia
Ground Wave Emergency Network — The Ground Wave Emergency Network (GWEN) was a command and control communications system intended for use by the United States government to facilitate military communications during a nuclear war. The network was implemented as an array of… … Wikipedia