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INS Imphal
INS ''Imphal'' is the third ship of the Visakhapatnam-class destroyer, ''Visakhapatnam''-class Stealth ship, stealth guided missile destroyer of the Indian Navy. She was being constructed at Mazagon Dock Limited (MDL) and has been launched on 20 April 2019. The ship started sea trials on 28 April 2023, and was delivered to the Indian Navy on 20 October 2023. It was commissioned on 26 December 2023. The ship was named in recognition of Manipur's sacrifices and contribution to India's freedom struggle including the Anglo-Manipur War of 1891 or the Indian National Army under leadership of Subhas Chandra Bose raising the Indian flag on 14 April 1944 at Moirang. It is the first Indian Navy ship named after a city in Northeast India. Construction The keel of ''Imphal'' was laid down on 19 May 2017, and she was launched on 20 April 2019 at Mazagon Dock Limited of Mumbai. She began her sea trials on 28 April 2023. She was subsequently delivered to the Indian Navy on 20 October 2023. Sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Imphal
Imphal ( Meitei pronunciation: /im.pʰal/; English pronunciation: ) is the capital city of the Indian state of Manipur. The metropolitan centre of the city contains the ruins of Kangla Palace (also known as Kangla Fort), the royal seat of the former Kingdom of Manipur, surrounded by a moat. Spread over parts of the districts of Imphal West and Imphal East, the former contains the majority of the city's area and population. Imphal is part of the Smart Cities Mission under the Ministry of Housing and Urban Affairs. History Initially ruled by King Khaba, Imphal was later ruled by the Pakhangba leaders. The clan of the Ningthouja tribe originated then. The Ningthouja tribe quickly expanded and dominated the region in politics and war. Kangla Palace was built by King Khagemba and his son Khunjaoba. The palace was later destroyed by the British during the Anglo-Manipur War. During the reign of Maharaja Bhagyachandra, there were a number of Burmese invasions. However, the k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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). Thus it crosses the conventional boundary between the UHF and SHF bands at 3.0 GHz. The S band is used by airport surveillance radar for air traffic control, weather radar, surface ship radar, and some communications satellites, especially those used by NASA to communicate with the Space Shuttle and the International Space Station. The 10 cm radar short-band ranges roughly from 1.55 to 5.2 GHz. The S band also contains the 2.4–2.483 GHz ISM band, widely used for low power unlicensed microwave devices such as cordless phones, wireless headphones (Bluetooth), wireless networking (WiFi), garage door openers, keyless vehicle locks, baby monitors as well as for medical diathermy machines and microwave ovens (typically at 2.495 GHz). India's reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defence Research And Development Organisation
The Defence Research and Development Organisation (DRDO) ( IAST: ''Raksā Anūsandhān Evam Vikās Sangaṭhan'') is the premier agency under the Department of Defence Research and Development in Ministry of Defence of the Government of India, charged with the military's research and development, headquartered in Delhi, India. It was formed in 1958 by the merger of the Technical Development Establishment and the Directorate of Technical Development and Production of the Indian Ordnance Factories with the Defence Science Organisation. Subsequently, Defence Research & Development Service (DRDS) was constituted in 1979 as a service of Group 'A' Officers / Scientists directly under the administrative control of Ministry of Defence. With a network of 52 laboratories that are engaged in developing defence technologies covering various fields like aeronautics, armaments, electronics, land combat engineering, life sciences, materials, missiles, and naval systems, DRDO is India's lar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Towed Array Sonar
A towed array sonar is a system of hydrophones towed behind a submarine or a surface ship on a cable. Trailing the hydrophones behind the vessel, on a cable that can be kilometers long, keeps the array's sensors away from the ship's own noise sources, greatly improving its signal-to-noise ratio, and hence the effectiveness of detecting and tracking faint contacts, such as quiet, low noise-emitting submarine threats, or seismic signals. A towed array offers superior resolution and range compared with hull mounted sonar. It also covers the baffles, the blind spot of hull mounted sonar. However, effective use of the system limits a vessel's speed and care must be taken to protect the cable from damage. History During World War I, a towed sonar array known as the "Electric Eel" was developed by Harvey Hayes, a U.S. Navy physicist. This system is believed to be the first towed sonar array design. It employed two cables, each with a dozen hydrophones attached. The project was discont ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sonar
Sonar (sound navigation and ranging or sonic navigation and ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, measure distances ( ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. "Sonar" can refer to one of two types of technology: ''passive'' sonar means listening for the sound made by vessels; ''active'' sonar means emitting pulses of sounds and listening for echoes. Sonar may be used as a means of acoustic location and of measurement of the echo characteristics of "targets" in the water. Acoustic location in air was used before the introduction of radar. Sonar may also be used for robot navigation, and SODAR (an upward-looking in-air sonar) is used for atmospheric investigations. The term ''sonar'' is also used for the equipment used to generate and receive the sound. The acoustic frequencies used in sonar systems vary from very low ( infrasonic) to ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bharat Electronics
Bharat Electronics Limited (BEL) is an Indian Government-owned aerospace and defence electronics company. It primarily manufactures advanced electronic products for ground and aerospace applications. BEL is one of nine PSUs under the Ministry of Defence of India. It has been granted '' Navratna'' status by the Government of India. History of BEL Bharat Electronics Limited was founded in Bangalore, Karnataka, India in 1954. Starting with the manufacture of a few communication equipment in 1956, BEL started producing receiving valves in 1961, germanium semiconductors in 1962, and radio transmitters for AIR in 1964 with help from the Soviet Union. * In 1966, BEL set up a radar manufacturing facility for the army and in-house R&D. In 1967, BEL began manufacturing transmitting tubes, silicon devices and integrated circuits. The PCB manufacturing facility was established in 1968. * In 1970, BEL started making black & white TV picture tubes, X-ray tubes and microwave tubes. In 1971, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surface-search Radar
A surface search radar, sometimes more accurately known as a sea-surface search radar or naval surveillance radar, is a type of military radar intended primarily to locate objects on the surface of lakes and oceans. Part of almost every modern naval ship, they are also widely used on maritime patrol aircraft and naval helicopters. When mounted on an aircraft, they are sometimes known by the British terminology, Air-to-Surface Vessel radar, or ASV for short. Similar radars are also widely used on civilian ships and even small pleasure craft, in which case they are more commonly known as marine radar. As with conventional surveillance radars, these systems detect objects by listening for the reflections of a radio signal off target objects, especially metal. The range of a surface search radar is greatly increased compared to other roles due to several aspects of the sea surfaces and the objects in it. In low sea states, water makes an excellent reflector for radio signals, which helps ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X Band
The X band is the designation for a band of frequencies in the microwave radio region of the electromagnetic spectrum. In some cases, such as in communication engineering, the frequency range of the X band is rather indefinitely set at approximately 7.0–11.2 GHz. In radar engineering, the frequency range is specified by the Institute of Electrical and Electronics Engineers (IEEE) as 8.0–12.0 GHz. The X band is used for radar, satellite communication, and wireless computer networks. Radar X band is used in radar applications including continuous-wave, pulsed, single-polarization, dual-polarization, synthetic aperture radar, and phased arrays. X band radar frequency sub-bands are used in civil, military, and government institutions for weather monitoring, air traffic control, maritime vessel traffic control, defense tracking, and vehicle speed detection for law enforcement. X band is often used in modern radars. The shorter wavelengths of the X band al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tata Advanced Systems
Tata Advanced Systems Limited (TASL) is an Indian aerospace, defense, military engineering & construction and technology company. It is a fully owned subsidiary of Tata Sons, a holding company for the Tata Group. History TASL entered into a joint-venture with Sikorsky Aircraft Corporation to manufacture the Sikorsky S-92 helicopter in India for the domestic civil and military markets. The plan was to have a US$200 million manufacturing plant operational in Hyderabad by 2010. As production began, the first S-92 cabin was delivered in November 2010, and capacity was expected to increase to 36–48 cabins a year. By the end of July 2013, assembly of 39 cabins had been completed. The joint-venture with Sikorsky has since been expanded to include development of aerospace components for other OEMs. This facility, called Tara, also located in Hyderabad, was completed in 2011 and commenced production in 2012. Another TASL joint-venture, with Lockheed Martin, is producing aero structu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terma A/S
Terma A/S is a Danish weapon and aerospace manufacturer for both civilian and military applications, and is owned by the Danish company Thrige Holding A/S. It is Denmark's largest company within the aerospace and weapon industry, employing approximately 1,100 people worldwide. The company was founded in 1949 by Orla and Svend Aage Jørgensen; it originally focused on the production of thermometers and manometers for ships and various other metal components. Following its purchase by Thorkild Juncker, Terma A/S refocused itself on the production of electronic measuring instruments along with early radar systems; it expanded rapidly during the 1950s and 1960s. The firm became a leader in defence electronics, and had diversified into air defense systems, aircraft avionics, and missiles by 1970. It continued to grow, acquiring various other Danish defense firms during the 1990s. In 1999, Terma A/S acted at the prime contractor for the Ørsted satellite, the first Danish satellite to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Secondary Surveillance Radar
Secondary surveillance radar (SSR)''Secondary Surveillance Radar'', Stevens M.C. Artech House, is a radar system used in air traffic control (ATC), that unlike primary radar systems that measure the bearing and distance of targets using the detected reflections of radio signals, relies on targets equipped with a radar transponder, that reply to each interrogation signal by transmitting encoded data such as an identity code, the aircraft's altitude and further information depending on its chosen mode. SSR is based on the military identification friend or foe (IFF) technology originally developed during World War II, therefore the two systems are still compatible. Monopulse secondary surveillance radar (MSSR), Mode S, TCAS and ADS-B are similar modern methods of secondary surveillance. Overview Primary radar The rapid wartime development of radar had obvious applications for air traffic control (ATC) as a means of providing continuous surveillance of air traffic dispositi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
L Band
The L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 to 2 gigahertz (GHz). This is at the top end of the ultra high frequency (UHF) band, at the lower end of the microwave range. Applications Mobile service In Europe, the Electronic Communications Committee (ECC) of the European Conference of Postal and Telecommunications Administrations (CEPT) has harmonized part of the L band (1452–1492 MHz), allowing individual countries to adopt this spectrum for terrestrial mobile/fixed communications networks supplemental downlink (MFCN SDL). By means of carrier aggregation, an LTE-Advanced or UMTS/HSDPA base station could use this spectrum to provide additional bandwidth for communications from the base station to the mobile device; i.e., in the downlink direction. In the Americas, mobile services are operated between the 1.7 GHz to 2.1 GHz range in the PCS and AWS bands. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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