RADAR

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Radar
Radar is a system that uses electromagnetic waves to identify the range, altitude, direction, or speed of both moving and fixed objects such as aircraft, ships, motor vehicles, weather formations, and terrain. A transmitter emits radio waves, which are reflected by the target and detected by a receiver, typically in the same location as the transmitter. Although the radio signal returned is usually very weak, radio signals can easily be amplified. This enables a radar to detect objects at ranges where other emissions, such as sound or visible light, would be too weak to detect. Radar is used in many contexts, including meteorological detection of precipitationair traffic controlpolice detection of speeding traffic, and by the military. It was originally called RDF (Radio Direction Finder) in Britain. The term RADAR was coined in 1941 as an acronym for Radio Detection and Ranging. The term has since entered the English language as a standard word, radar, losing the capitalization in the process.
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Radar
Le radar est un système qui utilise les ondes radio pour détecter et déterminer la distance et/ou la vitesse d'objets tels que les avionsbateaux, ou encore la pluie. Un émetteur envoie des ondes radio, qui sont réfléchies par la cible et détectées par un récepteur, souvent situé au même endroit que l'émetteur. La position est estimée grâce au temps de retour du signal et la vitesse est mesurée à partir du changement de fréquence du signal par effet Doppler.
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Radar
Radar ist die Abkürzung für Radio Detection and Ranging , ursprünglich Radio Aircraft Detection and Ranging (etwa: Funk-Erkennung und -Abstandsmessung) und ist die Bezeichnung für verschiedene Erkennungs- und Ortungsverfahren und -geräte auf der Basis elektromagnetischer Wellen im Radiofrequenzbereich (Funkwellen).
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Radio Darmstadt
Radio Darmstadt ist ein nichtkommerzielles Lokalradio für Darmstadt und die nähere Umgebung. Hinter dem Lokalradio steht der 1994 gegründete Trägerverein RadaR e.V.
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Radar
Radar – urządzenie służące do wykrywania - za pomocą fal radiowych - obiektów powietrznych, nawodnych oraz lądowych takich jak: samoloty, śmigłowce, rakiety, statki (również chmury oraz obiekty terenowe), pozwalające na określenie kierunku, odległości a także wielkości obiektu, a w radarach dopplerowskich także, do pomiarów prędkości wykrywanego obiektu. Radary mogą też służyć do penetracji gruntu (GPR). Tę samą technikę wykorzystuje się także do badania lodowców.
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Radar
Introduzione Radar è l'acronimo della frase inglese radio detection and ranging, e come dice il nome è un sistema che usa le onde radio per rilevare la distanza, la posizione e la velocità di oggetti: storicamente la prima applicazione (e a tutt'oggi la più importante) è il rilevamento di posizione, rotta e successivamente la velocità di aerei e navi. Nel tempo il principio fondamentale è stato applicato anche al telerilevamento, e sono stati costruiti radar meteorologici in grado di rilevare con precisione non solo pioggiagrandine e altre precipitazioni, ma perfino direzione e forza dei venti. Altra applicazione è il monitoraggio della velocità di veicoli su strada.
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