85 relations: Aircraft, AM broadcasting, Amateur radio direction finding, Amplitude-comparison monopulse, AN/FLR-9, AN/FRD-10, Animal, Antenna (radio), Anti-submarine warfare, Avalanche transceiver, Aviation, Battle of Britain, Battle of the Atlantic, Beacon, Beamforming, Captain-class frigate, Cardioid, Cathode ray tube, Chain Home, Civil defense, Compass, Dipole, Disaster response, Doppler effect, Electric battery, Electric beacon, Electromagnetic interference, Electronic warfare, Emergency position-indicating radiobeacon station, ESL Incorporated, Ford End, Geolocation, Goniometer, Helicopter, High-frequency direction finding, Indoor positioning system, International Naval Research Organization, Inverse trigonometric functions, Line-of-sight propagation, Loop antenna, MI5, MI8, Missile, Motor vehicle, Multilateration, MUSIC (algorithm), National Physical Laboratory (United Kingdom), Non-directional beacon, Parabola, Phase (waves), ..., Phase-comparison monopulse, Phased array, Pirate radio, Radar, Radio, Radio direction finder, Radio fix, Radio navigation, Radio receiver, Regenerative circuit, Robert Watson-Watt, Rocket, Royal Navy, RSS, Search and rescue, Signaling (telecommunications), Signals intelligence, Skywave, Surface wave, Television, Time (magazine), Traffic analysis, Transmitter, Transmitter hunting, Triangulation, U-boat, Ultra high frequency, Very high frequency, VHF omnidirectional range, Wavelength, Wildlife, Wire, World War II, Wullenweber, Yagi–Uda antenna. Expand index (35 more) »
Aircraft
An aircraft is a machine that is able to fly by gaining support from the air.
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AM broadcasting
AM broadcasting is a radio broadcasting technology, which employs amplitude modulation (AM) transmissions.
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Amateur radio direction finding
Amateur radio direction finding (ARDF, also known as radio orienteering and radiosport) is an amateur racing sport that combines radio direction finding with the map and compass skills of orienteering.
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Amplitude-comparison monopulse
Amplitude-comparison monopulse refers to a common direction finding technique.
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AN/FLR-9
The AN/FLR-9 is a type of very large circular "Wullenweber" antenna array, built at eight locations during the cold war for HF/DF direction finding of high priority targets.
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AN/FRD-10
The AN/FRD-10 Circularly Disposed Antenna Array (CDAA) was a United States Navy circular "Wullenweber" antenna array, built at a number of locations during the cold war for high frequency radio direction finding (HF/DF) and signals intelligence.
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Animal
Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia.
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Antenna (radio)
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
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Anti-submarine warfare
Anti-submarine warfare (ASW, or in older form A/S) is a branch of underwater warfare that uses surface warships, aircraft, or other submarines to find, track and deter, damage, or destroy enemy submarines.
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Avalanche transceiver
Avalanche transceivers or avalanche beacons are a class of active radio transceivers operating at 457 kHz and specialized for the purpose of finding people or equipment buried under snow.
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Aviation
Aviation, or air transport, refers to the activities surrounding mechanical flight and the aircraft industry.
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Battle of Britain
The Battle of Britain (Luftschlacht um England, literally "The Air Battle for England") was a military campaign of the Second World War, in which the Royal Air Force (RAF) defended the United Kingdom (UK) against large-scale attacks by Nazi Germany's air force, the Luftwaffe.
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Battle of the Atlantic
The Battle of the Atlantic was the longest continuous military campaign in World War II, running from 1939 to the defeat of Germany in 1945.
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Beacon
A beacon is an intentionally conspicuous device designed to attract attention to a specific location.
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Beamforming
Beamforming or spatial filtering is a signal processing technique used in sensor arrays for directional signal transmission or reception.
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Captain-class frigate
The Captain class was the designation given to 78 frigates of the Royal Navy, constructed in the United States of America, launched in 1942–1943 and delivered to the United Kingdom under the provisions of the Lend-Lease agreement (under which the United States of America supplied the United Kingdom and other Allied nations with materiel between 1941 and 1945).
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Cardioid
A cardioid (from the Greek καρδία "heart") is a plane curve traced by a point on the perimeter of a circle that is rolling around a fixed circle of the same radius.
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Cathode ray tube
The cathode ray tube (CRT) is a vacuum tube that contains one or more electron guns and a phosphorescent screen, and is used to display images.
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Chain Home
Chain Home, or CH for short, was the codename for the ring of coastal Early Warning radar stations built by the Royal Air Force (RAF) before and during the Second World War to detect and track aircraft.
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Civil defense
Civil defense or civil protection is an effort to protect the citizens of a state (generally non-combatants) from military attacks and natural disasters.
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Compass
A compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions (or points).
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Dipole
In electromagnetism, there are two kinds of dipoles.
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Disaster response
Disaster response is the second phase of the disaster management cycle.
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Doppler effect
The Doppler effect (or the Doppler shift) is the change in frequency or wavelength of a wave in relation to observer who is moving relative to the wave source.
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Electric battery
An electric battery is a device consisting of one or more electrochemical cells with external connections provided to power electrical devices such as flashlights, smartphones, and electric cars.
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Electric beacon
In navigation, an electric beacon (or electromagnetic beacon) is a kind of beacon, a device which marks a fixed location and allows direction finding equipment to find relative bearing, the direction to the beacon.
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Electromagnetic interference
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.
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Electronic warfare
Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum or directed energy to control the spectrum, attack of an enemy, or impede enemy assaults via the spectrum.
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Emergency position-indicating radiobeacon station
An emergency position-indicating radiobeacon station is a distress radiobeacon, a tracking transmitter that is triggered during an accident.
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ESL Incorporated
ESL Incorporated, or Electromagnetic Systems Laboratory, was a subsidiary of TRW, a high technology firm in the United States that was engaged in software design, systems analysis and hardware development for the strategic reconnaissance marketplace.
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Ford End
Ford End is a small village in the parish of Great Waltham half way between Chelmsford and Great Dunmow in Essex, England, comprising over 150 houses.
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Geolocation
Geolocation is the identification or estimation of the real-world geographic location of an object, such as a radar source, mobile phone, or Internet-connected computer terminal.
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Goniometer
A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position.
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Helicopter
A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors.
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High-frequency direction finding
High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II.
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Indoor positioning system
An indoor positioning system (IPS) is a system to locate objects or people inside a building using lights, radio waves, magnetic fields, acoustic signals, or other sensory information collected by mobile devices.
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International Naval Research Organization
The International Naval Research Organization was founded in 1964 and incorporated in the US state of Massachusetts.
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Inverse trigonometric functions
In mathematics, the inverse trigonometric functions (occasionally also called arcus functions, antitrigonometric functions or cyclometric functions) are the inverse functions of the trigonometric functions (with suitably restricted domains).
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Line-of-sight propagation
Line-of-sight propagation is a characteristic of electromagnetic radiation or acoustic wave propagation which means waves travel in a direct path from the source to the receiver.
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Loop antenna
A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor usually fed by a balanced source or feeding a balanced load.
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MI5
The Security Service, also MI5 (Military Intelligence, Section 5), is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ) and Defence Intelligence (DI).
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MI8
MI8, or Military Intelligence, Section 8 was a British Military Intelligence group responsible for signals intelligence and was created in 1914.
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Missile
In modern language, a missile is a guided self-propelled system, as opposed to an unguided self-propelled munition, referred to as a rocket (although these too can also be guided).
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Motor vehicle
A motor vehicle is a self-propelled vehicle, commonly wheeled, that does not operate on rails, such as trains or trams and used for the transportation of passengers, or passengers and property.
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Multilateration
Multilateration (MLAT) is a surveillance technique based on the measurement of the difference in distance to two stations at known locations by broadcast signals at known times.
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MUSIC (algorithm)
MUSIC (MUltiple SIgnal Classification) is an algorithm used for frequency estimation and emitter location.
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National Physical Laboratory (United Kingdom)
The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, London, England.
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Non-directional beacon
A non-directional (radio) beacon (NDB) is a radio transmitter at a known location, used as an aviation or marine navigational aid.
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Parabola
In mathematics, a parabola is a plane curve which is mirror-symmetrical and is approximately U-shaped.
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Phase (waves)
Phase is the position of a point in time (an instant) on a waveform cycle.
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Phase-comparison monopulse
Phase-comparison monopulse (also called phase-interferometry) describes a technique that can be used in radar and direction finding applications to accurately estimate the direction of arrival of a signal from the phase difference of the signal measured on two (or more) separated antennas.
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Phased array
In antenna theory, a phased array usually means an electronically scanned array; a computer-controlled array of antennas which creates a beam of radio waves which can be electronically steered to point in different directions, without moving the antennas.
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Pirate radio
Pirate radio or a pirate radio station is a radio station that broadcasts without a valid license.
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Radar
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Radio
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.
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Radio direction finder
A radio direction finder (RDF) is a device for finding the direction, or ''bearing'', to a radio source.
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Radio fix
In telecommunication and position fixing, the term radio fix has the following meanings.
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Radio navigation
Radio navigation or radionavigation is the application of radio frequencies to determine a position of an object on the Earth.
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Radio receiver
In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.
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Regenerative circuit
A regenerative circuit is an amplifier circuit that employs positive feedback (also known as regeneration); some of the output of the amplifying device is applied to its input without phase inversion, which reinforces the signal, increasing the amplification.
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Robert Watson-Watt
Sir Robert Alexander Watson-Watt, KCB, FRS, FRAeS (13 April 1892 – 5 December 1973) was a Scottish pioneer of radio direction finding and radar technology.
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Rocket
A rocket (from Italian rocchetto "bobbin") is a missile, spacecraft, aircraft or other vehicle that obtains thrust from a rocket engine.
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Royal Navy
The Royal Navy (RN) is the United Kingdom's naval warfare force.
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RSS
RSS (Rich Site Summary; originally RDF Site Summary; often called Really Simple Syndication) is a type of web feed which allows users to access updates to online content in a standardized, computer-readable format.
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Search and rescue
Search and rescue (SAR) is the search for and provision of aid to people who are in distress or imminent danger.
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Signaling (telecommunications)
In telecommunication, signaling has the following meanings.
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Signals intelligence
Signals intelligence (SIGINT) is intelligence-gathering by interception of signals, whether communications between people (communications intelligence—abbreviated to COMINT) or from electronic signals not directly used in communication (electronic intelligence—abbreviated to ELINT).
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Skywave
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere.
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Surface wave
In physics, a surface wave is a mechanical wave that propagates along the interface between differing media.
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Television
Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.
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Time (magazine)
Time is an American weekly news magazine and news website published in New York City.
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Traffic analysis
Traffic analysis is the process of intercepting and examining messages in order to deduce information from patterns in communication, which can be performed even when the messages are encrypted.
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Transmitter
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
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Transmitter hunting
Transmitter hunting (also known as T-hunting, fox hunting, bunny hunting, and bunny chasing), is an activity wherein participants use radio direction finding techniques to locate one or more radio transmitters hidden within a designated search area.
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Triangulation
In trigonometry and geometry, triangulation is the process of determining the location of a point by forming triangles to it from known points.
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U-boat
U-boat is an anglicised version of the German word U-Boot, a shortening of Unterseeboot, literally "undersea boat".
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Ultra high frequency
Ultra high frequency (UHF) is the ITU designation for radio frequencies in the range between 300 megahertz (MHz) and 3 gigahertz (GHz), also known as the decimetre band as the wavelengths range from one meter to one decimeter.
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Very high frequency
Very high frequency (VHF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) from 30 to 300 megahertz (MHz), with corresponding wavelengths of ten to one meter.
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VHF omnidirectional range
Very High Frequency (VHF) Omni-Directional Range (VOR) is a type of short-range radio navigation system for aircraft, enabling aircraft with a receiving unit to determine their position and stay on course by receiving radio signals transmitted by a network of fixed ground radio beacons.
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Wavelength
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
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Wildlife
Wildlife traditionally refers to undomesticated animal species, but has come to include all plants, fungi, and other organisms that grow or live wild in an area without being introduced by humans.
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Wire
A wire is a single, usually cylindrical, flexible strand or rod of metal.
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World War II
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.
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Wullenweber
The Wullenweber (the original name introduced by Dr. Hans Rindfleisch was Wullenwever) is a type of Circularly Disposed Antenna Array (CDAA) sometimes referred to as a Circularly Disposed Dipole Array (CDDA).
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Yagi–Uda antenna
A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods.
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Redirects here:
DFing, Dfing, Direction Finding, Pelengation, Radio Detection Finding, Radio Direction Finding, Radio direction finding, Radio direction-finding.
References
[1] https://en.wikipedia.org/wiki/Direction_finding