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automatic direction finder
- Sinônimos - Inglês
- automatic radio direction finder
- Definição1
- Equipment to determine the direction from which an electromagnetic signal is being generated. It can either be airborne or ground-based equipment. It operates in medium or low frequencies, consists of basically a loop aerial, and gives the null position of the transmitter. To remove 180º ambiguity, a sense aerial is used. The commonest air-interpreted ADF is one that utilizes a ground-based transmitting station called an NDB (nondirectional beacon).
- Fonte1
- KUMAR, Bharat (ed.). An illustrated dictionary of aviation. New York: McGraw-Hill, c2005. 752 p.
- Definição2
- Electronic navigation equipment that operates in the low- and medium-frequency bands. Used in conjunction with the ground-based nondirectional beacon (NDB), the instrument displays the number of degrees clockwise from the nose of the aircraft to the station being received.
- Fonte2
- FEDERAL AVIATION ADMINISTRATION. Pilot's handbook of aeronautical knowledge. [s.l.], 2008. Disponível em: http://www.faa.gov/regulations_policies/handbooks_manuals/aviation/pilot_handbook/media/PHAK%20-%20Cover-Preface.pdf. Acesso em: 26 jun. 2014.
- Definição3
- An aircraft radio navigation system which senses and indicates the direction to a L/MF nondirectional radio beacon (NDB) ground transmitter. Direction is indicated to the pilot as a magnetic bearing or as a relative bearing to the longitudinal axis of the aircraft depending on the type of indicator installed in the aircraft. In certain applications, such as military, ADF operations may be based on airborne and ground transmitters in the VHF/UHF frequency spectrum.
- Fonte3
- FEDERAL AVIATION ADMINISTRATION. Pilot/controller glossary (P/CG). 2014. Disponível em: https://www.faa.gov/air_traffic/publications/atpubs/pcg/index.htm.
- Fonte4
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Manual on testing of radio navigation aids. Fourth edition. Montreal, 2000. (Doc. 8071)
- Nota Adicional1
- Acronym in English: ADF.
- Contexto
- These facilities operate on frequencies available in portions of the band between 190 and 1 750 kHz with keyed identification and optional voice modulation. The airborne receiver installation is usually called an Automatic Direction Finder (ADF).
- Related Term
- radio direction finder
- Broader Term
- radio direction finding
- Français
- radiogoniomètre automatique
- Imagem
Drawing of an ADF RMI created 2005 by Dr. Wessmann.
