|
Stealth Technology
Stealth technology, also termed low observable technology (LO technology), is a sub-discipline of military tactics and passive and active electronic countermeasures. The term covers a range of military technology, methods used to make personnel, Stealth aircraft, aircraft, Stealth ship, ships, submarines, missiles, satellites, and Stealth ground vehicle, ground vehicles less visible (ideally invisible) to radar, Thermographic camera, infrared, sonar and other detection methods. It corresponds to military camouflage for these parts of the electromagnetic spectrum (i.e., multi-spectral camouflage). Development of modern stealth technologies in the United States began in 1958, where earlier attempts to prevent radar tracking of its Lockheed U-2, U-2 spy planes during the Cold War by the Soviet Union had been unsuccessful. Designers turned to developing a specific shape for planes that tended to reduce detection by redirecting electromagnetic radiation waves from radars. Radiation-a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
US Air Force F-117 Nighthawk
US or Us most often refers to: * Us (pronoun), ''Us'' (pronoun), the objective case of the English first-person plural pronoun ''we'' * US, an abbreviation for the United States US, U.S., Us, us, or u.s. may also refer to: Arts and entertainment Albums * Us (Brother Ali album), ''Us'' (Brother Ali album) or the title song, 2009 * Us (Empress Of album), ''Us'' (Empress Of album), 2018 * Us (Mull Historical Society album), ''Us'' (Mull Historical Society album), 2003 * Us (Peter Gabriel album), ''Us'' (Peter Gabriel album), 1992 * Us (EP), ''Us'' (EP), by Moon Jong-up, 2021 * ''Us'', by Maceo Parker, 1974 * ''Us'', mini-album by Peakboy, 2019 Songs * Us (James Bay song), "Us" (James Bay song), 2018 * Us (Jennifer Lopez song), "Us" (Jennifer Lopez song), 2018 * Us (Regina Spektor song), "Us" (Regina Spektor song), 2004 * Us (Gracie Abrams song), "Us" (Gracie Abrams song), 2024 * "Us", by Azealia Banks from ''Fantasea (mixtape), Fantasea'', 2012 * "Us", by Celine Dion from ''Let's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lockheed U-2
The Lockheed U-2, nicknamed the "''Dragon Lady''", is an American single-engine, high–altitude reconnaissance aircraft operated by the United States Air Force (USAF) and the Central Intelligence Agency (CIA) since the 1950s. Designed for all-weather, day-and-night intelligence gathering at altitudes above ), the U-2 has played a pivotal role in aerial surveillance for decades. Lockheed Corporation originally proposed the aircraft in 1953. It was approved in 1954, and its first test flight was in 1955. It was flown during the Cold War over the Soviet Union, China, Vietnam War, Vietnam, and Cuba. In 1960, Francis Gary Powers, Gary Powers was 1960 U-2 incident, shot down in a CIA U-2C over the Soviet Union by a surface-to-air missile (SAM). Major Rudolf Anderson, Rudolf Anderson Jr. was shot down in a U-2 during the Cuban Missile Crisis in 1962. U-2s have taken part in post-Cold War conflicts in War in Afghanistan (2001–2021), Afghanistan and Operation Iraqi Freedom, Iraq, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strategemata
''Strategemata'', or ''Stratagems'', is a Latin work by the Roman author Frontinus (c. 40 – 103 AD). It is a collection of examples of military stratagems from Greek and Roman history, ostensibly for the use of generals. Frontinus is assumed to have written ''Strategemata'' towards the end of the first century AD, possibly in connection with a lost work on military theory. Frontinus is best known as a writer on water engineering, but he had a distinguished military career. In ''Stratagems'' he draws partly on his own experience as a general in Germany under Domitian. However, most of the (more than five hundred) examples which he gives are less recent, for example he mentions the Siege of Uxellodunum in 51 BC. Similarities to versions in other Roman authors like Valerius Maximus and Livy suggest that he drew mainly on literary sources. The work consists of four books, of which three are undoubtedly by Frontinus. The authenticity of the fourth book has been challenged. J ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frontinus
Sextus Julius Frontinus (c. 40 – 103 AD) was a Roman civil engineer, author, soldier and senator of the late 1st century AD. He was a successful general under Domitian, commanding forces in Roman Britain, and on the Rhine and Danube frontiers. A '' novus homo'', he was consul three times. Frontinus ably discharged several important administrative duties for Nerva and Trajan. However, he is best known to the post-Classical world as an author of technical treatises, especially '' De aquaeductu'', dealing with the aqueducts of Rome. Family Due to a lack of either a '' titulus honorarius'' or ''sepulcralis'', there is no outline of Frontinus' life, the names of his parents, or of his wife. Some details can be inferred from chance mentions: He is thought to be of Narbonese origins, and originally of the equestrian class. From the nomenclature of the name of Publius Calvisius Ruso Julius Frontinus (consul c. 84), it is likely Frontinus had a sister, who was the other's mothe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Art Of War
''The Art of War'' is an ancient Chinese military treatise dating from the late Spring and Autumn period (roughly 5th century BC). The work, which is attributed to the ancient Chinese military strategist Sun Tzu ("Master Sun"), is composed of 13 chapters. Each one is devoted to a different set of skills or art related to warfare and how it applies to military strategy and tactics. For almost 1,500 years, it was the lead text in an anthology that was formalized as the Seven Military Classics by Emperor Shenzong of Song in 1080. ''The Art of War'' remains the most influential strategy text in East Asian warfare and has influenced both East Asian and Western military theory and thinking. The book contains a detailed explanation and analysis of the 5th-century BC Chinese military, from weapons, environmental conditions, and strategy to rank and discipline. Sun also stressed the importance of intelligence operatives and espionage to the war effort. Considered one of histor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sun Tzu
Sun Tzu (; zh, t=孫子, s=孙子, first= t, p=Sūnzǐ) may have been a Chinese General, military general, strategist, philosopher, and writer who lived during the Eastern Zhou period (771–256 BC). Sun Tzu is traditionally credited as the author of ''The Art of War'', a Classical Chinese text on military strategy from the Warring States period, though the earliest parts of the work probably date to at least a century after his purported death. Sun Tzu is revered in Chinese culture, Chinese and East Asian culture as a legendary historical and military figure; however, his historical existence is uncertain. The Han dynasty historian Sima Qian and other traditional Chinese historians placed him as a minister to King Helü of Wu and dated his lifetime to 544–496 BC. The name ''Sun Tzu''by which he is more popularly knownis an Chinese honorifics, honorific which means "Master Sun (surname), Sun". His birth name was said to be Sun Wu ( zh, t=孫武, s=孙武, first=t) and he is p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spectral Signature
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). The spectral signature of stars indicates the composition of the stellar atmosphere. The spectral signature of an object is a function of the incidental EM wavelength and material interaction with that section of the electromagnetic spectrum. The measurements can be made with various instruments, including a task specific spectrometer, although the most common method is separation of the red, green, blue and near infrared portion of the EM spectrum as acquired by digital cameras. Calibrating spectral signatures under specific illumination are collected in order to apply a correction to airborne or satellite imagery digital images. The user of one kind of spectroscope looks through it at a tube of ionized gas. The user sees specific lines of colour falling on a graduated scale. Each substance will have its own uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infrared Signature
Infrared signature, as used by defense scientists and the military, is the appearance of objects to infrared sensors. An infrared signature depends on many factors, including the shape and size of the object, temperature, and emissivity, reflection of external sources ( earthshine, sunshine, skyshine) from the object's surface, the background against which it is viewed and the waveband of the detecting sensor. As such there is no all-encompassing definition of infrared signature nor any trivial means of measuring it. For example, the infrared signature of a truck viewed against a field will vary significantly with changing weather, time of day and engine loading. Two fairly successful examples of defining the infrared signature of an object are the apparent temperature difference at the sensor and the contrast radiant intensity (CRI) definitions. Apparent temperature difference The apparent temperature difference method of defining infrared signature gives the physical temperat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. It is one type of anti-aircraft warfare, anti-aircraft system; in modern armed forces, missiles have replaced most other forms of dedicated anti-aircraft weapons, with anti-aircraft guns pushed into specialized roles. The first attempt at SAM development took place during World War II, but no operational systems were introduced. Further development in the 1940s and 1950s led to operational systems being introduced by most major forces during the second half of the 1950s. Smaller systems, suitable for close-range work, evolved through the 1960s and 1970s, to modern systems that are man-portable. Shipborne systems followed the evolution of land-based models, starting with long-range weapons and steadily evolving toward smaller designs to provide a layered defence. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Infrared Search And Track
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, such as the infrared signatures of jet aircraft and helicopters.Mahulikar, pp. 218-245 IRST is a generalized case of Forward Looking Infrared (FLIR), i.e. from forward-looking to all-round situation awareness. Such systems are passive (thermographic camera), meaning they do not give out any radiation of their own, unlike radar. This gives them the advantage that they are difficult to detect. However, because the atmosphere attenuates infrared to some extent (although not as much as visible light) and because adverse weather can attenuate it also (again, not as badly as visible systems), their range compared to a radar is limited. Within range, an IRST's angular resolution is better than radar due to the shorter wavelength. History Early systems The first uses of an IRST system appeared in the F-101 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northrop Grumman B-2 Spirit
The Northrop B-2 Spirit, also known as the Stealth Bomber, is an American Heavy bomber, heavy strategic bomber, featuring low-observable stealth aircraft, stealth technology designed to penetrator (aircraft), penetrate dense anti-aircraft warfare, anti-aircraft defenses. A Subsonic aircraft, subsonic flying wing with a crew of two, the plane was designed by Northrop Corporation, Northrop (later Northrop Grumman) as the prime contractor, with Boeing, Hughes Aircraft Company, Hughes, and Vought as principal subcontractors, and was produced from 1988 to 2000. The bomber can drop conventional weapon, conventional and thermonuclear weapons, such as up to eighty Mark 82 bomb, Mk 82 Joint Direct Attack Munition, JDAM Global Positioning System, GPS-guided bombs, or sixteen B83 nuclear bombs. The B-2 is the only acknowledged in-service aircraft that can carry large air-to-surface missile, air-to-surface Standoff missile, standoff weapons in a stealth configuration. Development began ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiation-absorbent Material
In materials science, radiation-absorbent material (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. The more effective the RAM, the lower the resulting level of reflected RF radiation. Many measurements in electromagnetic compatibility (EMC) and antenna radiation patterns require that spurious signals arising from the test setup, including reflections, are negligible to avoid the risk of causing measurement errors and ambiguities. Introduction One of the most effective types of RAM comprises arrays of pyramid-shaped pieces, each of which is constructed from a suitably lossy material. To work effectively, all internal surfaces of the anechoic chamber must be entirely covered with RAM. Sections of RAM may be temporarily removed to install equipment but they must be replaced before performing any tests. To be sufficie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
