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direction finder |
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direction finder, electronic device used to determine the position of a ship or aircraft. In a simple direction finder a radio receiver is equipped with a revolving directional antenna. The antenna receives the strongest radio signal when it is pointing directly at a transmitter. By determining the direction of two land-based transmitters, a navigator may plot his position by triangulation. Direction finders have been replaced in many applications with more accurate systems, such as radar radar, system or technique for detecting the position, movement, and nature of a remote object by means of radio waves reflected from its surface. Although most radar units use microwave frequencies, the principle of radar is not confined to any particular frequency ..... Click the link for more information. and satellite navigation systems (see satellite, artificial satellite, artificial, object constructed by humans and placed in orbit around the earth or other celestial body (see also space probe ). The satellite is lifted from the earth's surface by a rocket and, once placed in orbit, maintains its motion without further ..... Click the link for more information. ). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| On 30 August 1956 the Air Coordinating Committee approved a common military-civil short-range air navigation system called VORTAC, which combined TACAN with the Civil Aeronautic Authority's very high frequency omnirange direction finder. Photo: (1) Dave Long holds a 1943 radio direction finder at the Confederate Air Force Museum in Camarillo. The radio direction finder "is just not as precise as the Magellan," Rodriguez says. |
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direction finder