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Meaconing
Meaconing is the interception and rebroadcast of navigation signals. These signals are rebroadcast on the received frequency, typically with power higher than the original signal, to confuse enemy navigation. Consequently, aircraft or ground stations are given inaccurate bearings. Meaconing is more of a concern to personnel in navigation ratings than to radio operators. However, communications transmitters are often used to transmit navigation signals. Since communications personnel operate the transmitters, they must know how to deal with any communications problems resulting from meaconing. Successful meaconing can cause aircraft to be lured into "hot" (ambush-ready) landing zones or enemy airspace, ships to be diverted from their intended routes, bombers to expend ordnance on false targets, or ground stations to receive inaccurate bearings or position locations. The term 'meacon' is a portmanteau of ''masking beacon''. Alleged cases of meaconing Iran says it used t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Interception
In Ball game, ball-playing Competitive sport, competitive team sports, an interception or pick is a move by a player involving a pass of the ball—whether by foot or hand, depending on the rules of the sport—in which the ball is intended for a player of the same team but caught or otherwise brought under control by a player of the opposing team, who thereby usually gains possession of the ball for their team. It is commonly seen in football, including American football, American and Canadian football, as well as association football, rugby league, rugby union, Australian rules football and Gaelic football, as well as any sport by which a loose object is passed between players toward a goal. In basketball, this is called a Steal (basketball), steal. Gridiron football In American football and Canadian football, an interception occurs when a forward pass that has not yet touched the ground is caught by a player of the defensive team. This leads to an immediate change of possess ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John J
John is a common English name and surname: * John (given name) * John (surname) John may also refer to: New Testament Works * Gospel of John, a title often shortened to John * First Epistle of John, often shortened to 1 John * Second Epistle of John, often shortened to 2 John * Third Epistle of John, often shortened to 3 John People * John the Baptist (died ), regarded as a prophet and the forerunner of Jesus Christ * John the Apostle (died ), one of the twelve apostles of Jesus Christ * John the Evangelist, assigned author of the Fourth Gospel, once identified with the Apostle * John of Patmos, also known as John the Divine or John the Revelator, the author of the Book of Revelation, once identified with the Apostle * John the Presbyter, a figure either identified with or distinguished from the Apostle, the Evangelist and John of Patmos Other people with the given name Religious figures * John, father of Andrew the Apostle and Saint Peter * Pope John ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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. The term is often used to refer to the addition of unwanted signals to a useful signal. Common examples include: * Electromagnetic interference (EMI) * Co-channel interference (CCI), also known as crosstalk * Adjacent-channel interference (ACI) * Intersymbol interference (ISI) * Inter-carrier interference (ICI), caused by doppler shift in OFDM modulation (multitone modulation). * Common-mode interference (CMI) * Conducted interference Noise is a form of interference but not all interference is noise. Radio resource management aims at reducing and controlling the co-channel and adjacent-channel interference. Interference alignment A solution to interference problems in wireless communication networks is interference alignment, which was crystallized by Syed Ali Jafar at the University of Cali ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radio Jamming
Radio jamming is the deliberate blocking of or interference with wireless communications.https://apps.fcc.gov/edocs_public/attachmatch/DA-12-347A1.pdf Enforcement Advisory No. 2012-02 FCC Enforcement Advisory Cell Jammers, GPS Jammers, and Other Jamming Devices Consumer Alert: Using or Importing Jammers is Illegal In some cases, jammers work by the transmission of radio signals that disrupt telecommunications by decreasing the signal-to-noise ratio. The concept can be used in wireless data networks to disrupt information flow. It is a common form of censorship in totalitarian countries, in order to prevent foreign radio stations in border areas from reaching the country. Jamming is usually distinguished from interference that can occur due to device malfunctions or other accidental circumstances. Devices that simply cause interference are regulated differently. Unintentional "jamming" occurs when an operator transmits on a busy frequency without first checking whether it is in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Black (video Game)
''Black'' is a 2006 first-person shooter game developed by Criterion Games and published by Electronic Arts for the PlayStation 2 and Xbox. The player assumes control of Jack Kellar, a US Army special operations soldier being interrogated about his previous missions involving a terrorist operation. Gameplay involves players fighting terrorists by using firearms and grenades. The game is notable and was heavily promoted for its large focus on destructive effects and explosions during gameplay, as well as its cinema-inspired action and sound quality. ''Black'' received positive reviews upon release. Critics praised the gameplay, sound design and presentation, but criticized the game's short length and lack of multiplayer. Despite Criterion's desire to develop a sequel, creative differences with Electronic Arts ultimately ended plans for one. As such a spiritual successor, '' Bodycount'', was created by some of the same development team at Codemasters and released in 2011. Plot '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Traffic Control
Air traffic control (ATC) is a service provided by ground-based air traffic controllers who direct aircraft on the ground and through a given section of controlled airspace, and can provide advisory services to aircraft in non-controlled airspace. The primary purpose of ATC is to prevent collisions, organise and expedite the flow of traffic in the air, and provide information and other support for pilots. Personnel of air traffic control monitor aircraft location in their assigned airspace by radar and communicate with the pilots by radio. To prevent collisions, ATC enforces Separation (air traffic control), traffic separation rules, which ensure each aircraft maintains a minimum amount of 'empty space' around it at all times. It is also common for ATC to provide services to all General aviation, private, Military aviation, military, and commercial aircraft operating within its airspace; not just civilian aircraft. Depending on the type of flight and the class of airspace, AT ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dulles Airport
Washington Dulles International Airport ( ) – commonly known by its former name of Dulles International Airport, by its airport code of IAD, or simply as Dulles Airport – is an international airport in the Eastern United States, located west of downtown Washington, D.C., in Loudoun and Fairfax counties in Northern Virginia. Opened in 1962, the airport is named after John Foster Dulles, an influential secretary of state during the Cold War who briefly represented New York in the United States Senate. Its main terminal was designed by Eero Saarinen, who also designed the TWA Flight Center at John F. Kennedy International Airport. Operated by the Metropolitan Washington Airports Authority, Dulles occupies , Effective May 15, 2025. straddling the Loudoun–Fairfax IAD ranks fourth in the US in terms of land area, after Denver International Airport, Dallas/Fort Worth International Airport, and Southwest Florida International Airport. Most of the airport is in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Die Hard 2
''Die Hard 2'' (also known by its tagline ''Die Harder'' or ''Die Hard 2: Die Harder'')The film's onscreen title is ''Die Hard 2'', as also given at the initial home-video release'official website The film's original advertising used "Die Harder" as a tagline, and many releases of the film (e.g. the 2006 DVD release and 2007 Blu-ray release) were marketed under the title ''Die Hard 2: Die Harder''. is a 1990 American action film directed by Renny Harlin, written by Steven E. de Souza and Doug Richardson, co-produced by Joel Silver, and starring Bruce Willis as John McClane alongside Bonnie Bedelia, William Sadler, Art Evans, William Atherton, Franco Nero, Dennis Franz, Fred Thompson, John Amos, and Reginald VelJohnson. The sequel to ''Die Hard'' (1988) and the second installment in the ''Die Hard'' film series, the film was released on July 4, 1990, in the United States. As with the first film, the action in ''Die Hard 2'' takes place on Christmas Eve. McClane is waiti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pandora's Clock
''Pandora's Clock'' (also known as ''Doomsday Virus'') is a 1996 NBC miniseries based on a novel by John J. Nance about a deadly virus on a Boeing 747-200 from Frankfurt to John F. Kennedy International Airport. Directed by Eric Laneuville, the film stars Richard Dean Anderson, Stephen Root, Jane Leeves, Robert Loggia and Daphne Zuniga and the script closely follows the book. Plot The story begins in the mountains of Bavaria, Germany, where wildlife documentarian Ernest Helms ( Michael Winters) is filming local wildlife. While filming, he discovers a man attempting to break into his rental car. After foiling the man's attempt, Helms prepares to drive away but is thwarted by the man smashing the driver's window. Helms, however, succeeds in escaping the crazed man, but receives a minor cut on his hand. A few days later, in Frankfurt, Captain James Holland (Richard Dean Anderson), amidst preparations for his forthcoming transatlantic flight as Captain of Quantum Airlines Fligh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type 23 Frigate
The Type 23 frigate or Duke class is a class of frigates built for the United Kingdom's Royal Navy. The ships are named after British Dukes, thus leading to the class being commonly known as the Duke class. The first Type 23, , was commissioned in 1989, and the sixteenth, was commissioned in June 2002. They form the core of the Royal Navy's destroyer and frigate fleet and serve alongside the Type 45 destroyers. They were designed for anti-submarine warfare, but have been used for a range of uses. Eight Type 23 frigates remain in service with the Royal Navy, with three vessels having been sold to the Chilean Navy and five being retired since 2021. The Royal Navy's Type 23 frigates will be replaced by the Type 26 Global Combat Ship and the Type 31 frigate. it is anticipated that HMS ''St Albans'' will be the last to retire from the Royal Navy, in 2035. Development When first conceived in the late 1970s, the Type 23 was intended to be a light anti-submarine frigate with a t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigation
Navigation is a field of study that focuses on the process of monitoring and controlling the motion, movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, air navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's Position (geometry), position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and Relative direction, direction. In this sense, navigation includes orienteering and pedestrian navigation. For marine navigation, this involves the safe movement of ships, boats and other nautical craft either on or underneath the water using positions from navigation equipment with appropriate nautical char ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Navy
The Royal Navy (RN) is the naval warfare force of the United Kingdom. It is a component of His Majesty's Naval Service, and its officers hold their commissions from the King of the United Kingdom, King. Although warships were used by Kingdom of England, English and Kingdom of Scotland, Scottish kings from the early Middle Ages, medieval period, the first major maritime engagements were fought in the Hundred Years' War against Kingdom of France, France. The modern Royal Navy traces its origins to the English Navy of the early 16th century; the oldest of the British Armed Forces, UK's armed services, it is consequently known as the Senior Service. From the early 18th century until the World War II, Second World War, it was the world's most powerful navy. The Royal Navy played a key part in establishing and defending the British Empire, and four Imperial fortress colonies and a string of imperial bases and coaling stations secured the Royal Navy's ability to assert naval superior ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
