175 relations: Acoustic signature, Active radar homing, Adaptiv, Adaptive compliant wing, Aerial refueling, Aerodynamics, Aileron, Airborne early warning and control, Aircraft, Aircraft flight control system, Airframe, Albatros C.I, Amphibious transport dock, Anechoic tile, Angle of incidence (optics), Arleigh Burke-class destroyer, Astronomical seeing, Avro Vulcan, Bistatic radar, Boeing, Boeing X-53 Active Aeroelastic Wing, Bomber, Camouflage, Carbon fiber reinforced polymer, Cell site, Cellulose acetate, Central Intelligence Agency, Chaff (countermeasure), Chengdu J-20, Clutter (radar), Cockpit, Cold War, Command and control, Composite material, Concave polygon, Contra-rotating propellers, Contrail, Coolant, Corner reflector, Counter-illumination, Cross section (geometry), Dazzle camouflage, Dielectric, Diffraction-limited system, Diffuse reflection, Diffused lighting camouflage, Doppler radar, Electromagnetic radiation, Electronic countermeasure, Elevator (aeronautics), ..., Elevon, Exhaust system, Fairchild Republic A-10 Thunderbolt II, Ferrite (magnet), Flap (aeronautics), Flaperon, Fluidics, Flying wing, Fokker E.III, Fuselage, German submarine U-480, Germany, Gold, Grumman TBF Avenger, Gulf War, HAL AMCA, Harmonic, Heat sink, Hope Diamond, Horten brothers, Indium tin oxide, Inertia, Infra-red search and track, Infrared homing, Infrared signature, Infrared window, Invisibility, Jet engine, Kelly Johnson (engineer), La Fayette-class frigate, Linke-Hofmann R.I, List of World War II electronic warfare equipment, Lockheed A-12, Lockheed Corporation, Lockheed F-117 Nighthawk, Lockheed Have Blue, Lockheed Martin F-22 Raptor, Lockheed Martin F-35 Lightning II, Lockheed SR-71 Blackbird, Lockheed U-2, Lockheed YF-12, Low light level television, Low-frequency radar, Low-probability-of-intercept radar, Mach number, Measurement and signature intelligence, Metal, Military camouflage, Missile, Moore's law, Multi-spectral camouflage, Multistatic radar, NASA, NATO reporting name, Negative-index metamaterial, Northrop Corporation, Northrop Grumman B-2 Spirit, Northrop Tacit Blue, Northrop YF-23, Paint sheen, Passive radar, PBS, Petr Ufimtsev, Physical vapor deposition, Plasma (physics), Plasma stealth, Propeller (aeronautics), Radar, Radar cross-section, Radar jamming and deception, Radar warning receiver, Radial velocity, Radiation-absorbent material, Radio frequency, Relaxed stability, Resonance, Royal Canadian Navy, Russians, Ryan AQM-91 Firefly, Ryan Firebee, Sachsen-class frigate, Satellite, Schlieren, Schlieren photography, Science (journal), Ship, Signals intelligence, Skjold-class corvette, Skunk Works, Sonar, Sonic boom, Soviet Union, Spectral signature, SS class airship, Stealth aircraft, Stealth ship, Stefan–Boltzmann law, Submarine, Sukhoi Su-57, Sukhoi/HAL FGFA, Surface-to-air missile, Surveillance aircraft, Sweden, Taiwan, Technology, Tempest (codename), Thermal radiation, Thermographic camera, Thin film, Thrust vectoring, Transmitter, Tuo Chiang-class corvette, Tupolev Tu-95, United States, United States invasion of Panama, United States Marine Corps, USS San Antonio, Visby-class corvette, Warship, Wavelength, Western Front (World War I), Wien's displacement law, Wing, World War I, Yehudi lights. Expand index (125 more) » « Shrink index
Acoustic signature is used to describe a combination of acoustic emissions of sound emitters, such as those of ships and submarines.
Active radar homing (ARH) is a missile guidance method in which a missile contains a radar transceiver (in contrast to semi-active radar homing, which uses only a receiver) and the electronics necessary for it to find and track its target autonomously.
Adaptiv is an active camouflage technology developed by BAE Systems AB to protect military vehicles from detection by near infrared night vision devices, providing infrared stealth.
An adaptive compliant wing is a wing which is flexible so that aspects of its shape can be changed in flight.
Aerial refueling, also referred to as air refueling, in-flight refueling (IFR), air-to-air refueling (AAR), and tanking, is the process of transferring aviation fuel from one military aircraft (the tanker) to another (the receiver) during flight.
Aerodynamics, from Greek ἀήρ aer (air) + δυναμική (dynamics), is the study of the motion of air, particularly its interaction with a solid object, such as an airplane wing.
An aileron (French for "little wing" or "fin") is a hinged flight control surface usually forming part of the trailing edge of each wing of a fixed-wing aircraft.
An airborne early warning and control (AEW&C) system is an airborne radar picket system designed to detect aircraft, ships and vehicles at long ranges and perform command and control of the battlespace in an air engagement by directing fighter and attack aircraft strikes.
An aircraft is a machine that is able to fly by gaining support from the air.
A conventional fixed-wing aircraft flight control system consists of flight control surfaces, the respective cockpit controls, connecting linkages, and the necessary operating mechanisms to control an aircraft's direction in flight.
The airframe of an aircraft is its mechanical structure.
The Albatros C.I was the first of the successful C-series of two-seat general-purpose biplanes built by Albatros Flugzeugwerke during World War I. Based on the unarmed Albatros B.II, the C.I reversed the pilot and observer seating so that the observer occupied the rear cockpit which was fitted with a ring-mounted 7.92 mm (0.312 in) Parabellum MG14 machine gun.
An amphibious transport dock, also called a landing platform/dock (LPD), is an amphibious warfare ship, a warship that embarks, transports, and lands elements of a landing force for expeditionary warfare missions.
Anechoic tiles are rubber or synthetic polymer tiles containing thousands of tiny voids, applied to the outer hulls of military ships and submarines, as well as anechoic chambers.
In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal.
The Arleigh Burke class of guided missile destroyers (DDGs) is the United States Navy's first class of destroyer built around the Aegis Combat System and the SPY-1D multifunction passive electronically scanned array radar.
Astronomical seeing is the blurring and twinkling of astronomical objects like stars due to turbulent mixing in the Earth's atmosphere, causing variations of the optical refractive index.
The Avro Vulcan (later Hawker Siddeley Vulcan from July 1963) is a jet-powered tailless delta wing high-altitude strategic bomber, which was operated by the Royal Air Force (RAF) from 1956 until 1984.
Bistatic radar is the name given to a radar system comprising a transmitter and receiver that are separated by a distance comparable to the expected target distance.
The Boeing Company is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets, satellites, and missiles worldwide.
The X-53 Active Aeroelastic Wing (AAW) development program is a completed American research project that was undertaken jointly by the Air Force Research Laboratory (AFRL), Boeing Phantom Works and NASA's Dryden Flight Research Center, where the technology was flight tested on a modified McDonnell Douglas F/A-18 Hornet.
A bomber is a combat aircraft designed to attack ground and naval targets by dropping air-to-ground weaponry (such as bombs), firing torpedoes and bullets or deploying air-launched cruise missiles.
Camouflage is the use of any combination of materials, coloration, or illumination for concealment, either by making animals or objects hard to see (crypsis), or by disguising them as something else (mimesis).
Carbon fiber reinforced polymer, carbon fiber reinforced plastic or carbon fiber reinforced thermoplastic (CFRP, CRP, CFRTP or often simply carbon fiber, carbon composite or even carbon), is an extremely strong and light fiber-reinforced plastic which contains carbon fibers.
A cell site or cell tower is a cellular-enabled mobile device site where antennae and electronic communications equipment are placed — typically on a radio mast, tower, or other raised structure — to create a cell (or adjacent cells) in a cellular network.
Cellulose acetate is the acetate ester of cellulose.
The Central Intelligence Agency (CIA) is a civilian foreign intelligence service of the United States federal government, tasked with gathering, processing, and analyzing national security information from around the world, primarily through the use of human intelligence (HUMINT).
Chaff, originally called Window by the British and Düppel by the Second World War era German Luftwaffe (from the Berlin suburb where it was first developed), is a radar countermeasure in which aircraft or other targets spread a cloud of small, thin pieces of aluminium, metallized glass fibre or plastic, which either appears as a cluster of primary targets on radar screens or swamps the screen with multiple returns.
The Chengdu J-20 is a single-seat, twinjet, all-weather, stealth fifth-generation fighter aircraft developed by China's Chengdu Aerospace Corporation for the People's Liberation Army Air Force (PLAAF).
Clutter is a term used for unwanted echoes in electronic systems, particularly in reference to radars.
A cockpit or flight deck is the area, usually near the front of an aircraft or spacecraft, from which a pilot controls the aircraft.
The Cold War was a state of geopolitical tension after World War II between powers in the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies and others).
Command and control or C2 is a "set of organizational and technical attributes and processes...
A composite material (also called a composition material or shortened to composite, which is the common name) is a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components.
A simple polygon that is not convex is called concave, non-convex or reentrant.
Aircraft equipped with contra-rotating propellers, also referred to as CRP, coaxial contra-rotating propellers, or high-speed propellers, apply the maximum power of usually a single piston or turboprop engine to drive two coaxial propellers in contra-rotation (rotation about the same axis in opposite directions).
Contrails (short for "condensation trails") are line-shaped clouds produced by aircraft engine exhaust or changes in air pressure, typically at aircraft cruise altitudes several miles above the Earth's surface.
A coolant is a substance, typically liquid or gas, that is used to reduce or regulate the temperature of a system.
A corner reflector is a retroreflector consisting of three mutually perpendicular, intersecting flat surfaces, which reflects waves back directly towards the source, but translated.
Counter-illumination is a method of active camouflage seen in marine animals such as firefly squid and midshipman fish, and in military prototypes, producing light to match their backgrounds in both brightness and wavelength.
In geometry and science, a cross section is the non-empty intersection of a solid body in three-dimensional space with a plane, or the analog in higher-dimensional spaces.
Dazzle camouflage, also known as razzle dazzle (in the U.S.) or dazzle painting, was a family of ship camouflage used extensively in World War I, and to a lesser extent in World War II and afterwards.
A dielectric (or dielectric material) is an electrical insulator that can be polarized by an applied electric field.
The resolution of an optical imaging system a microscope, telescope, or camera can be limited by factors such as imperfections in the lenses or misalignment.
Diffuse reflection is the reflection of light or other waves or particles from a surface such that a ray incident on the surface is scattered at many angles rather than at just one angle as in the case of specular reflection.
Diffused lighting camouflage was a form of active camouflage using counter-illumination to enable a ship to match its background, the night sky, that was tested by the Royal Canadian Navy on corvettes during World War II.
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance.
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
An electronic countermeasure (ECM) is an electrical or electronic device designed to trick or deceive radar, sonar or other detection systems, like infrared (IR) or lasers.
Elevators are flight control surfaces, usually at the rear of an aircraft, which control the aircraft's pitch, and therefore the angle of attack and the lift of the wing.
Elevons are aircraft control surfaces that combine the functions of the elevator (used for pitch control) and the aileron (used for roll control), hence the name.
An exhaust system is usually piping used to guide reaction exhaust gases away from a controlled combustion inside an engine or stove.
The Fairchild Republic A-10 Thunderbolt II is a single-seat, twin turbofan engine, straight wing jet aircraft developed by Fairchild-Republic for the United States Air Force (USAF).
A ferrite is a ceramic material made by mixing and firing large proportions iron(III) oxide (Fe2O3, rust) blended with small proportions of one or more additional metallic elements, such as barium, manganese, nickel, and zinc.
Flaps are a type of high-lift device used to increase the lift of an aircraft wing at a given airspeed.
A flaperon (a portmanteau of flap and aileron) on an aircraft's wing is a type of control surface that combines the functions of both flaps and ailerons.
Fluidics, or fluidic logic, is the use of a fluid to perform analog or digital operations similar to those performed with electronics.
A flying wing is a tailless fixed-wing aircraft that has no definite fuselage.
The Fokker E.III was the main variant of the ''Eindecker'' (literally meaning "one deck") fighter aircraft of World War I. It entered service on the Western Front in December 1915 and was also supplied to Austria-Hungary and Turkey.
The fuselage (from the French fuselé "spindle-shaped") is an aircraft's main body section.
U-480 was an experimental Kriegsmarine Type VIIC U-boat of World War II.
Germany (Deutschland), officially the Federal Republic of Germany (Bundesrepublik Deutschland), is a sovereign state in central-western Europe.
Gold is a chemical element with symbol Au (from aurum) and atomic number 79, making it one of the higher atomic number elements that occur naturally.
The Grumman TBF Avenger (designated TBM for aircraft manufactured by General Motors) is an American torpedo bomber developed initially for the United States Navy and Marine Corps, and eventually used by several air and naval aviation services around the world.
The Gulf War (2 August 199028 February 1991), codenamed Operation Desert Shield (2 August 199017 January 1991) for operations leading to the buildup of troops and defense of Saudi Arabia and Operation Desert Storm (17 January 199128 February 1991) in its combat phase, was a war waged by coalition forces from 35 nations led by the United States against Iraq in response to Iraq's invasion and annexation of Kuwait.
The HAL Advanced Medium Combat Aircraft (AMCA) is an Indian programme of a fifth-generation fighter aircraft.
A harmonic is any member of the harmonic series, a divergent infinite series.
A heat sink (also commonly spelled heatsink) is a passive heat exchanger that transfers the heat generated by an electronic or a mechanical device to a fluid medium, often air or a liquid coolant, where it is dissipated away from the device, thereby allowing regulation of the device's temperature at optimal levels.
The Hope Diamond is one of the most famous jewels in the world, with ownership records dating back almost four centuries.
Walter Horten (born 13 November 1913; died 9 December 1998 in Baden-Baden, Germany) and Reimar Horten (born 12 March 1915; died 14 March 1994 in Villa General Belgrano, Argentina), sometimes credited as the Horten Brothers, were German aircraft pilots and enthusiasts.
Indium tin oxide (ITO) is a ternary composition of indium, tin and oxygen in varying proportions.
Inertia is the resistance of any physical object to any change in its position and state of motion.
An infrared search and track (IRST) system (sometimes known as infrared sighting and tracking) is a method for detecting and tracking objects which give off infrared radiation (see Infrared signature) such as jet aircraft and helicopters.
Infrared homing is a passive weapon guidance system which uses the infrared (IR) light emission from a target to track and follow it.
The term infrared signature is used by defense scientists and the military to describe the appearance of objects to infrared sensors.
The infrared atmospheric window is the overall dynamic property of the earth's atmosphere, taken as a whole at each place and occasion of interest, that lets some infrared radiation from the cloud tops and land-sea surface pass directly to space without intermediate absorption and re-emission, and thus without heating the atmosphere.
Invisibility is the state of an object that cannot be seen.
A jet engine is a type of reaction engine discharging a fast-moving jet that generates thrust by jet propulsion.
Clarence Leonard "Kelly" Johnson (February 27, 1910 – December 21, 1990) was an American aeronautical and systems engineer.
The La Fayette class (also known as FL-3000 for "Frégate Légère de 3,000 tonnes", or FLF for Frégate Légère Furtive) are general purpose frigates built by DCNS and operated by the French Navy.
The Linke-Hofmann R.I was a heavy bomber aircraft designed and built by the German company Linke-Hofmann during World War I. Only four were built and the type never saw service with the Luftstreitkräfte (Imperial German Air Service).
This is a List of World War II electronic warfare equipment and code words and tactics derived directly from the use of electronic equipment.
The Lockheed A-12 was a reconnaissance aircraft built for the United States Central Intelligence Agency (CIA) by Lockheed's Skunk Works, based on the designs of Clarence "Kelly" Johnson.
The Lockheed Corporation was an American aerospace company.
The Lockheed F-117 Nighthawk is an American single-seat, twin-engine stealth attack aircraft that was developed by Lockheed's secretive Skunk Works division and operated by the United States Air Force (USAF).
Lockheed Have Blue was the code name for Lockheed's proof of concept demonstrator that preceded the production F-117 Nighthawk stealth aircraft.
The Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF).
The Lockheed Martin F-35 Lightning II is a family of single-seat, single-engine, all-weather stealth multirole fighters.
The Lockheed SR-71 "Blackbird" is a long-range, Mach 3+ strategic reconnaissance aircraft that was operated by the United States Air Force.
The Lockheed U-2, nicknamed "Dragon Lady", is an American single-jet engine, ultra-high altitude reconnaissance aircraft operated by the United States Air Force (USAF) and previously flown by the Central Intelligence Agency (CIA).
The Lockheed YF-12 was an American prototype interceptor aircraft evaluated by the United States Air Force.
Low light level television (LLLTV) is a type of electronic sensing device, usually a CCD camera sensitive to wavelengths above the normal "visible" (0.4 to 0.7 micrometre) wavelengths, and into the short-wave Infrared - usually to about 1.0 to 1.1 micrometres.
Low-frequency radar is radar which uses frequencies lower than 1 GHz such as L-band, UHF, VHF, and HF, as opposed to the usual radar bands, which range from 2 GHz and up, and the maximum is 40 GHz.The radar cross section of any target depends on the radar transmitted frequency.
A low-probability-of-intercept radar (LPIR) is a Radar which use measures to avoid detection by passive radar detection equipment (such as a radar warning receiver – RWR, or Electronic Support receiver) while it is searching for a target or engaged in target tracking.
In fluid dynamics, the Mach number (M or Ma) is a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound.
Measurement and signature intelligence (MASINT) is a technical branch of intelligence gathering, which serves to detect, track, identify or describe the signatures (distinctive characteristics) of fixed or dynamic target sources.
A metal (from Greek μέταλλον métallon, "mine, quarry, metal") is a material (an element, compound, or alloy) that is typically hard when in solid state, opaque, shiny, and has good electrical and thermal conductivity.
Military camouflage is the use of camouflage by a military force to protect personnel and equipment from observation by enemy forces.
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).
Moore's law is the observation that the number of transistors in a dense integrated circuit doubles about every two years.
Multi-spectral camouflage is the use of counter-surveillance techniques to conceal objects from detection across several parts of the electromagnetic spectrum at the same time.
A multistatic radar system contains multiple spatially diverse monostatic radar or bistatic radar components with a shared area of coverage.
The National Aeronautics and Space Administration (NASA) is an independent agency of the executive branch of the United States federal government responsible for the civilian space program, as well as aeronautics and aerospace research.
NATO reporting names are code names for military equipment of Russia, China, and, historically, the former Eastern Bloc (Soviet Union and other nations of the Warsaw Pact).
Negative-index metamaterial or negative-index material (NIM) is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency range.
Northrop Corporation was a leading United States aircraft manufacturer from its formation in 1939 until its 1994 merger with Grumman to form Northrop Grumman.
The Northrop (later Northrop Grumman) B-2 Spirit, also known as the Stealth Bomber, is an American heavy penetration strategic bomber, featuring low observable stealth technology designed for penetrating dense anti-aircraft defenses; it is a flying wing design with a crew of two.
The Northrop Tacit Blue was a technology demonstrator aircraft created to demonstrate that a low-observable stealth surveillance aircraft with a low probability of intercept radar and other sensors could operate close to the forward line of battle with a high degree of survivability.
The Northrop/McDonnell Douglas YF-23 was an American single-seat, twin-engine stealth fighter aircraft technology demonstrator designed for the United States Air Force (USAF).
In paint technology, the sheen is the glossiness of a paint finish.
Passive radar systems (also referred to as passive coherent location and passive covert radar) encompass a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals.
The Public Broadcasting Service (PBS) is an American public broadcaster and television program distributor.
Pyotr Yakovlevich Ufimtsev (Пётр Я́ковлевич Уфи́мцев) (born 1931 in Ust-Charyshskaya Pristan, West Siberian Krai, now Altai Krai) is a Soviet/Russian physicist and mathematician, considered the seminal force behind modern stealth aircraft technology.
Physical vapor deposition (PVD) describes a variety of vacuum deposition methods which can be used to produce thin films and coatings.
Plasma (Henry George Liddell, Robert Scott, A Greek English Lexicon, on Perseus) is one of the four fundamental states of matter, and was first described by chemist Irving Langmuir in the 1920s.
Plasma stealth is a proposed process to use ionized gas (plasma) to reduce the radar cross-section (RCS) of an aircraft.
An aircraft propeller, or airscrew,Beaumont, R.A.; Aeronautical Engineering, Odhams, 1942, Chapter 13, "Airscrews".
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
Radar cross-section (RCS) is a measure of how detectable an object is by radar.
Radar jamming and deception (electronic countermeasures) is the intentional emission of radio frequency signals to interfere with the operation of a radar by saturating its receiver with noise or false information.
Radar warning receiver (RWR) systems detect the radio emissions of radar systems.
The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point.
Radiation-absorbent material, usually known as RAM, is a material which has been specially designed and shaped to absorb incident RF radiation (also known as non-ionising radiation), as effectively as possible, from as many incident directions as possible.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
In aviation, relaxed stability is the tendency of an aircraft to change its attitude and angle of bank spontaneously.
In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.
The Royal Canadian Navy (RCN; French: Marine royale canadienne) is the naval force of Canada.
Russians (русские, russkiye) are an East Slavic ethnic group native to Eastern Europe. The majority of Russians inhabit the nation state of Russia, while notable minorities exist in other former Soviet states such as Belarus, Kazakhstan, Moldova, Ukraine and the Baltic states. A large Russian diaspora also exists all over the world, with notable numbers in the United States, Germany, Israel, and Canada. Russians are the most numerous ethnic group in Europe. The Russians share many cultural traits with their fellow East Slavic counterparts, specifically Belarusians and Ukrainians. They are predominantly Orthodox Christians by religion. The Russian language is official in Russia, Belarus, Kazakhstan, Kyrgyzstan, and Tajikistan, and also spoken as a secondary language in many former Soviet states.
The Ryan AQM-91 Firefly was a developmental drone developed during the Vietnam War to perform long-range reconnaissance, especially into China.
The Ryan Firebee is a series of target drones developed by the Ryan Aeronautical Company beginning in 1951.
The F124 Sachsen class is Germany's latest class of highly advanced air-defense frigates.
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
Schlieren (from German; singular "Schliere", meaning "streak") are optical inhomogeneities in transparent material not necessarily visible to the human eye.
Schlieren photography (from German; singular "Schliere", meaning "streak") is a visual process that is used to photograph the flow of fluids of varying density.
Science, also widely referred to as Science Magazine, is the peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals.
A ship is a large watercraft that travels the world's oceans and other sufficiently deep waterways, carrying passengers or goods, or in support of specialized missions, such as defense, research and fishing.
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).
Skjold-class corvettes (skjold means "shield" in Norwegian) are a class of six large, superfast, stealth missile corvettes in service with the Royal Norwegian Navy.
Skunk Works is an official pseudonym for Lockheed Martin's Advanced Development Programs (ADP), formerly called Lockheed Advanced Development Projects. It is responsible for a number of famous aircraft designs, including the U-2, the Lockheed SR-71 Blackbird, the Lockheed F-117 Nighthawk, Lockheed Martin F-22 Raptor, and the Lockheed Martin F-35 Lightning II, which are used in the air forces of several countries.
Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
A sonic boom is the sound associated with the shock waves created whenever an object traveling through the air travels faster than the speed of sound.
The Soviet Union, officially the Union of Soviet Socialist Republics (USSR) was a socialist state in Eurasia that existed from 1922 to 1991.
Spectral signature is the variation of reflectance or emittance of a material with respect to wavelengths (i.e.,reflectance/emittance as a function of wavelength).
SS (Submarine Scout or Sea Scout) class airships were simple, cheap and easily assembled small non-rigid airships or "blimps" that were developed as a matter of some urgency to counter the German U-boat threat to British shipping during World War I. The class proved to be versatile and effective, with a total of 158 being built in several versions.
Stealth aircraft are designed to avoid detection using a variety of technologies that reduce reflection/emission of radar, infrared, visible light, radio-frequency (RF) spectrum, and audio, collectively known as stealth technology.
A stealth ship is a ship which employs stealth technology construction techniques in an effort to ensure that it is harder to detect by one or more of radar, visual, sonar, and infrared methods.
The Stefan–Boltzmann law describes the power radiated from a black body in terms of its temperature.
A submarine (or simply sub) is a watercraft capable of independent operation underwater.
The Sukhoi Su-57 (Сухой Су-57) is the designation for a stealth, single-seat, twin-engine multirole fifth-generation jet fighter being developed for air superiority and attack operations.
The Sukhoi/HAL Fifth Generation Fighter Aircraft (FGFA) or Perspective Multi-role Fighter (PMF) was a fifth-generation fighter aircraft planned for India and Russia.
A surface-to-air missile (SAM, pronunced), or ground-to-air missile (GTAM, pronounced), is a missile designed to be launched from the ground to destroy aircraft or other missiles.
A surveillance aircraft is an aircraft used for surveillance—collecting information over time.
Sweden (Sverige), officially the Kingdom of Sweden (Swedish), is a Scandinavian country in Northern Europe.
Taiwan, officially the Republic of China (ROC), is a state in East Asia.
Technology ("science of craft", from Greek τέχνη, techne, "art, skill, cunning of hand"; and -λογία, -logia) is first robustly defined by Jacob Bigelow in 1829 as: "...principles, processes, and nomenclatures of the more conspicuous arts, particularly those which involve applications of science, and which may be considered useful, by promoting the benefit of society, together with the emolument of those who pursue them".
TEMPEST is a National Security Agency specification and a NATO certification referring to spying on information systems through leaking emanations, including unintentional radio or electrical signals, sounds, and vibrations.
Thermal radiation is electromagnetic radiation generated by the thermal motion of charged particles in matter.
A thermographic camera (also called an infrared camera or thermal imaging camera) is a device that forms an image using infrared radiation, similar to a common camera that forms an image using visible light.
A thin film is a layer of material ranging from fractions of a nanometer (monolayer) to several micrometers in thickness.
Thrust vectoring, also thrust vector control or TVC, is the ability of an aircraft, rocket, or other vehicle to manipulate the direction of the thrust from its engine(s) or motor(s) in order to control the attitude or angular velocity of the vehicle.
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
The Tuo Chiang-class corvette is a class of stealth multi-mission corvettes operated by the Republic of China (Taiwan) Navy.
The Tupolev Tu-95 (Туполев Ту-95; NATO reporting name: "Bear") is a large, four-engine turboprop-powered strategic bomber and missile platform.
The United States of America (USA), commonly known as the United States (U.S.) or America, is a federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.
The United States Invasion of Panama, code named Operation Just Cause occurred between mid-December 1989 and late January 1990.
The United States Marine Corps (USMC), also referred to as the United States Marines, is a branch of the United States Armed Forces responsible for conducting amphibious operations with the United States Navy.
USS San Antonio (LPD-17), the lead ship of her class of amphibious transport dock or landing platform dock, is the first ship of the United States Navy to be named for the city of San Antonio, Texas.
The Visby class is the latest class of corvette to be adopted by the Swedish Navy after the and corvettes.
A warship is a naval ship that is built and primarily intended for naval warfare.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
The Western Front was the main theatre of war during the First World War.
Wien's displacement law states that the black body radiation curve for different temperatures peaks at a wavelength inversely proportional to the temperature.
A wing is a type of fin that produces lift, while moving through air or some other fluid.
World War I (often abbreviated as WWI or WW1), also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918.
Yehudi lights are lamps of automatically-controlled brightness placed on the front and leading edges of an aircraft to raise the aircraft's luminance to the average brightness of the sky, a form of active camouflage using counter-illumination.