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Radar altimeter, the Glossary

A radar altimeter (RA), also called a radio altimeter (RALT), electronic altimeter, reflection altimeter, or low-range radio altimeter (LRRA), measures altitude above the terrain presently beneath an aircraft or spacecraft by timing how long it takes a beam of radio waves to travel to ground, reflect, and return to the craft.^[1]

89 relations: Aircraft, Airliner, Albert Francis Hegenberger, Altimeter, Altitude, Anti-aircraft warfare, Arthur E. Kennelly, ASV Mark II radar, ATR 42, Autoland, Autopilot, Autothrottle, BAC One-Eleven, BBC, Bell Labs, Bell System, Boeing F/A-18E/F Super Hornet, Bournemouth, British Aerospace Jetstream, British Aircraft Corporation, C band (IEEE), Cathode-ray tube, Climb (aeronautics), Continuous-wave radar, Cornwall, Daniel Guggenheim Fund for the Promotion of Aeronautics, E band (NATO), Edward Victor Appleton, Electrical impedance, Flight computer, Frequency mixer, Frequency modulation, General Dynamics F-111 Aardvark, Global Positioning System, Ground proximity warning system, Guglielmo Marconi, Height above ground level, Instrument approach, Instrument flight rules, Interference (communication), International Telecommunication Union, ITT Inc., ITU Radio Regulations, Jimmy Doolittle, Kennelly–Heaviside layer, Landing flare, LC circuit, Lidar, Lloyd Espenschied, Miles Barnett, ... Expand index (39 more) »
Navigational flight instruments

Aircraft

An aircraft (aircraft) is a vehicle that is able to fly by gaining support from the air.

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Airliner

An airliner is a type of airplane for transporting passengers and air cargo.

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Albert Francis Hegenberger

Albert Francis Hegenberger (September 30, 1895 – August 31, 1983) was a major general in the United States Air Force and a pioneering aviator who set a flight distance record with Lester J. Maitland, completing the first transpacific flight to Hawaii in 1927 as navigator of the ''Bird of Paradise''.

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Altimeter

An altimeter or an altitude meter is an instrument used to measure the altitude of an object above a fixed level.

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Altitude

Altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object.

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Anti-aircraft warfare

Anti-aircraft warfare is the counter to aerial warfare and it includes "all measures designed to nullify or reduce the effectiveness of hostile air action" (NATO's definition).

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Arthur E. Kennelly

Arthur Edwin Kennelly (December 17, 1861 – June 18, 1939) was an American electrical engineer.

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ASV Mark II radar

Radar, Air to Surface Vessel, Mark II, or ASV Mk.

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ATR 42

The ATR 42 is a regional airliner produced by Franco-Italian manufacturer ATR, with final assembly in Toulouse, France.

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Autoland

In aviation, autoland describes a system that fully automates the landing procedure of an aircraft's flight, with the flight crew supervising the process.

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Autopilot

An autopilot is a system used to control the path of an aircraft, marine craft or spacecraft without requiring constant manual control by a human operator.

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Autothrottle

An autothrottle (automatic throttle, also known as autothrust, A/T or A/THR) is a system that allows a pilot to control the power setting of an aircraft's engines by specifying a desired flight characteristic, rather than manually controlling the fuel flow.

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BAC One-Eleven

The BAC One-Eleven (or BAC-111/BAC 1-11) is an early jet airliner produced by the British Aircraft Corporation (BAC).

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BBC

The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England.

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Bell Labs

Bell Labs is an American industrial research and scientific development company credited with the development of radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages B, C, C++, S, SNOBOL, AWK, AMPL, and others.

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Bell System

The Bell System was a system of telecommunication companies, led by the Bell Telephone Company and later by the American Telephone and Telegraph Company (AT&T), that dominated the telephone services industry in North America for over 100 years from its creation in 1877 until its antitrust breakup in 1983.

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Boeing F/A-18E/F Super Hornet

The Boeing F/A-18E and F/A-18F Super Hornet are a series of American supersonic twin-engine, carrier-capable, multirole fighter aircraft derived from the McDonnell Douglas F/A-18 Hornet, in service with the armed forces of the U.S., Australia, and Kuwait.

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Bournemouth

Bournemouth is a coastal resort town in the Bournemouth, Christchurch and Poole unitary authority area, in the ceremonial county of Dorset, England.

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British Aerospace Jetstream

The British Aerospace Jetstream is a small twin turboprop airliner, with a pressurised fuselage, developed as the Jetstream 31 from the earlier Handley Page Jetstream.

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British Aircraft Corporation

The British Aircraft Corporation (BAC) was a British aircraft manufacturer formed from the government-pressured merger of English Electric Aviation Ltd., Vickers-Armstrongs (Aircraft), the Bristol Aeroplane Company and Hunting Aircraft in 1960.

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C band (IEEE)

The C band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a portion of the electromagnetic spectrum in the microwave range of frequencies ranging from 4.0 to 8.0 gigahertz (GHz).

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Cathode-ray tube

A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, which emit electron beams that are manipulated to display images on a phosphorescent screen.

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Climb (aeronautics)

Iberia Airbus A321 on the climbout from London Heathrow Airport In aviation, a climb or ascent is the operation of increasing the altitude of an aircraft.

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Continuous-wave radar

Continuous-wave radar (CW radar) is a type of radar system where a known stable frequency continuous wave radio energy is transmitted and then received from any reflecting objects.

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Cornwall

Cornwall (Kernow;; or) is a ceremonial county in South West England.

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The Daniel Guggenheim Fund for the Promotion of Aeronautics was established by Daniel Guggenheim and his son, Harry Guggenheim on June 16, 1926.

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E band (NATO)

The NATO E band is a designation given to the radio frequencies from 2000 to 3000 MHz (equivalent to wavelengths between 15 and 10 cm) during the cold war period.

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Edward Victor Appleton

Sir Edward Victor Appleton (6 September 1892 – 21 April 1965) was an English physicist, Nobel Prize winner (1947) and pioneer in radiophysics.

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Electrical impedance

In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.

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Flight computer

A flight computer is a form of slide rule used in aviation and one of a very few analog computers in widespread use in the 21st century.

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Frequency mixer

In electronics, a mixer, or frequency mixer, is an electrical circuit that creates new frequencies from two signals applied to it.

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Frequency modulation

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.

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General Dynamics F-111 Aardvark

The General Dynamics F-111 Aardvark is a retired supersonic, medium-range, multirole combat aircraft.

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Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radio navigation system owned by the United States government and operated by the United States Space Force. Radar altimeter and Global Positioning System are radio navigation.

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Ground proximity warning system

A ground proximity warning system (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle.

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Guglielmo Marconi

Guglielmo Giovanni Maria Marconi, 1st Marquis of Marconi (25 April 187420 July 1937) was an Italian inventor, electrical engineer, and politician, known for his creation of a practical radio wave–based wireless telegraph system.

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Height above ground level

In aviation, atmospheric sciences and broadcasting, a height above ground level (AGL or HAGL) is a height measured with respect to the underlying ground surface.

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Instrument approach

In aviation, an instrument approach or instrument approach procedure (IAP) is a series of predetermined maneuvers for the orderly transfer of an aircraft operating under instrument flight rules from the beginning of the initial approach to a landing, or to a point from which a landing may be made visually. Radar altimeter and instrument approach are air traffic control.

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Instrument flight rules

In aviation, instrument flight rules (IFR) is one of two sets of regulations governing all aspects of civil aviation aircraft operations; the other is visual flight rules (VFR).

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Interference (communication)

In telecommunications, an interference is that which modifies a signal in a disruptive manner, as it travels along a communication channel between its source and receiver.

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International Telecommunication Union

The International Telecommunication Union (ITU)French: Union Internationale des Télécommunications is a specialized agency of the United Nations responsible for many matters related to information and communication technologies.

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ITT Inc.

ITT Inc., formerly ITT Corporation, is an American worldwide manufacturing company based in Stamford, Connecticut.

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ITU Radio Regulations

The ITU Radio Regulations (RR) is a basic document of the International Telecommunication Union (ITU) that regulates on law of nations scale radiocommunication services and the utilisation of radio frequencies.

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Jimmy Doolittle

James Harold Doolittle (December 14, 1896 – September 27, 1993) was an American military general and aviation pioneer who received the Medal of Honor for his raid on Japan during World War II, known as the Doolittle Raid in his honor.

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Kennelly–Heaviside layer

The Heaviside layer, sometimes called the Kennelly–Heaviside layer, named after Arthur E. Kennelly and Oliver Heaviside, is a layer of ionised gas occurring roughly between 90km and 150 km (56 and 93 mi) above the ground — one of several layers in the Earth's ionosphere.

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Landing flare

The landing flare, also referred to as the round out, is a maneuver or stage during the landing of an aircraft.

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LC circuit

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

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Lidar

Lidar (also LIDAR, LiDAR or LADAR, an acronym of "light detection and ranging" or "laser imaging, detection, and ranging") is a method for determining ranges by targeting an object or a surface with a laser and measuring the time for the reflected light to return to the receiver.

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Lloyd Espenschied

Lloyd Espenschied (April 27, 1889 – June 21, 1986) was an American electrical engineer who invented the modern coaxial cable with Herman Andrew Affel.

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Miles Barnett

Miles Aylmer Fulton Barnett (30 April 1901 – 27 March 1979) was a New Zealand physicist and meteorologist.

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Military aircraft

A military aircraft is any fixed-wing or rotary-wing aircraft that is operated by a legal or insurrectionary military of any type.

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National Research Council Canada

The National Research Council Canada (NRC; Conseil national de recherches Canada) is the primary national agency of the Government of Canada dedicated to science and technology research and development.

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Navigation is a field of study that focuses on the process of monitoring and controlling the movement of a craft or vehicle from one place to another.

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Newfoundland and Labrador

Newfoundland and Labrador (Terre-Neuve-et-Labrador; frequently abbreviated as NL) is the easternmost province of Canada, in the country's Atlantic region.

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Ohio State University

The Ohio State University (Ohio State or OSU) is a public land-grant research university in Columbus, Ohio, United States.

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Oliver Heaviside

Oliver Heaviside FRS (18 May 1850 – 3 February 1925) was an English self-taught mathematician and physicist who invented a new technique for solving differential equations (equivalent to the Laplace transform), independently developed vector calculus, and rewrote Maxwell's equations in the form commonly used today.

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Oscilloscope

An oscilloscope (informally scope or O-scope) is a type of electronic test instrument that graphically displays varying voltages of one or more signals as a function of time. Radar altimeter and oscilloscope are measuring instruments.

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Oxford

Oxford is a city and non-metropolitan district in Oxfordshire, England, of which it is the county town.

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Pressure altimeter

Altitude can be determined based on the measurement of atmospheric pressure.

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Radar

Radar is a system that uses radio waves to determine the distance (ranging), direction (azimuth and elevation angles), and radial velocity of objects relative to the site. Radar altimeter and Radar are air traffic control and measuring instruments.

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Radio

Radio is the technology of communicating using radio waves.

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Radio frequency

Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around.

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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, either the vessel or an obstruction. Radar altimeter and radio navigation are air traffic control and navigation.

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Radio wave

Radio waves are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths greater than, about the diameter of a grain of rice.

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Railway track

A railway track (British English and UIC terminology) or railroad track (American English), also known as a train track or permanent way (often "perway" in Australia), is the structure on a railway or railroad consisting of the rails, fasteners, railroad ties (sleepers, British English) and ballast (or slab track), plus the underlying subgrade.

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RCA

The RCA Corporation was a major American electronics company, which was founded in 1919 as the Radio Corporation of America.

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Royal Australian Air Force

The Royal Australian Air Force (RAAF) is the principal aerial warfare force of Australia, a part of the Australian Defence Force (ADF) along with the Royal Australian Navy and the Australian Army.

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Russell C. Newhouse

Russell Conwell Newhouse (1906–1998) made many contributions to the advancement of aviation in a distinguished career running from the late 1920s into the 1970s.

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S band

The S band is a designation by the Institute of Electrical and Electronics Engineers (IEEE) for a part of the microwave band of the electromagnetic spectrum covering frequencies from 2 to 4 gigahertz (GHz).

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Safety service

Safety service (also: safety radiocommunication service or safety-of-life service) is – according to Article 1.59 of the International Telecommunication Union's (ITU) Radio Regulations (RR) – defined as «A radiocommunication service used permanently or temporarily for the safeguarding of human life and property.» Few typical examples of safety services are as follows. Radar altimeter and safety service are air traffic control and radio navigation.

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Satellite geodesy

Satellite geodesy is geodesy by means of artificial satellites—the measurement of the form and dimensions of Earth, the location of objects on its surface and the figure of the Earth's gravity field by means of artificial satellite techniques.

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Sea level

Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured.

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Shortwave radio

Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW).

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Spacecraft

A spacecraft is a vehicle that is designed to fly and operate in outer space.

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Speed of light

The speed of light in vacuum, commonly denoted, is a universal physical constant that is exactly equal to). According to the special theory of relativity, is the upper limit for the speed at which conventional matter or energy (and thus any signal carrying information) can travel through space.

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Strike fighter

In current military parlance, a strike fighter is a multirole combat aircraft designed to operate both as an attack aircraft and as an air superiority fighter.

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Surface-to-air missile

A surface-to-air missile (SAM), also known as a ground-to-air missile (GTAM) or surface-to-air guided weapon (SAGW), is a missile designed to be launched from the ground or the sea to destroy aircraft or other missiles.

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Terrain

Terrain or relief (also topographical relief) involves the vertical and horizontal dimensions of land surface.

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Terrain-following radar

Terrain-following radar (TFR) is a military aerospace technology that allows a very-low-flying aircraft to automatically maintain a relatively constant altitude above ground level and therefore make detection by enemy radar more difficult.

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Tizard Mission

The Tizard Mission, officially the British Technical and Scientific Mission, was a delegation from the United Kingdom that visited the United States during World War II to share secret research and development (R&D) work that had military applications.

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United Airlines

United Airlines, Inc. is a major American airline headquartered at the Willis Tower in Chicago, Illinois.

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United States Air Force

The United States Air Force (USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States.

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United States Patent and Trademark Office

The United States Patent and Trademark Office (USPTO) is an agency in the U.S. Department of Commerce that serves as the national patent office and trademark registration authority for the United States.

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Vannevar Bush

Vannevar Bush (March 11, 1890 – June 28, 1974) was an American engineer, inventor and science administrator, who during World War II headed the U.S. Office of Scientific Research and Development (OSRD), through which almost all wartime military R&D was carried out, including important developments in radar and the initiation and early administration of the Manhattan Project.

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Vertical datum

In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation.

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References

[1] https://en.wikipedia.org/wiki/Radar_altimeter

Also known as Combined altitude radar altimeter, Electronic altimeter, FuG 101, LRRA, Low Range Radio Altimeter, RADALT, Radar altimetry, Radio altimeter, Radioaltimeter.

, Military aircraft, National Research Council Canada, Navigation, Newfoundland and Labrador, Ohio State University, Oliver Heaviside, Oscilloscope, Oxford, Pressure altimeter, Radar, Radio, Radio frequency, Radio navigation, Radio wave, Railway track, RCA, Royal Australian Air Force, Russell C. Newhouse, S band, Safety service, Satellite geodesy, Sea level, Shortwave radio, Spacecraft, Speed of light, Strike fighter, Surface-to-air missile, Terrain, Terrain-following radar, Tizard Mission, United Airlines, United States Air Force, United States Patent and Trademark Office, Vannevar Bush, Vertical datum, Western Electric, Wilbur Wright Field, William Littell Everitt, World War II.

Radar altimeter, the Glossary

Table of Contents

See also

Navigational flight instruments

References