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SPS-550K
The AN/SPS-55 is a solid state surface search and navigation radar. It was developed by Cardion Electronics for the U.S. Navy under a contract awarded in 1971. It was originally developed for a class of ships known as Patrol Frigates, but it was also installed on numerous Cruisers, Destroyers, and Minesweepers. It is an I band radar and its antenna consists of two waveguide slotted arrays mounted back-to-back. One array provides linear polarisation and the other provides circular polarisation. Polarisation is user selectable and the circular polarised array is more effective in reducing returns from precipitation. Features * Magnetron transmitter * Low noise RF receiver * Sensitivity time control * Fast time constant filtering * Sector radiate The ef ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
I Band (NATO)
The NATO I band is the obsolete designation given to the radio frequencies from 8 000 to 10 000 MHz (equivalent to wavelengths between 3.75 and 3 cm) during the Cold War period. Since 1992 frequency allocations, allotment and assignments are in line to NATO Joint Civil/Military Frequency Agreement (NJFA). However, in order to identify military radio spectrum requirements, e.g. for crises management planning, training, Electronic warfare Electronic warfare (EW) is any action involving the use of the electromagnetic spectrum (EM spectrum) or directed energy to control the spectrum, attack an enemy, or impede enemy assaults. The purpose of electronic warfare is to deny the opponen ... activities, or in military operations, this system is still in use. References Radio spectrum Microwave bands {{Wireless-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Linear Polarization
In electrodynamics, linear polarization or plane polarization of electromagnetic radiation is a confinement of the electric field vector or magnetic field vector to a given plane along the direction of propagation. The term ''linear polarization'' (French: ''polarisation rectiligne'') was coined by Augustin-Jean Fresnel in 1822.A. Fresnel, "Mémoire sur la double réfraction que les rayons lumineux éprouvent en traversant les aiguilles de cristal de roche suivant les directions parallèles à l'axe", read 9 December 1822; printed in H. de Senarmont, E. Verdet, and L. Fresnel (eds.), ''Oeuvres complètes d'Augustin Fresnel'', vol. 1 (1866), pp.731–51; translated as "Memoir on the double refraction that light rays undergo in traversing the needles of quartz in the directions parallel to the axis", , 2021 (open access); §9. See '' polarization'' and ''plane of polarization'' for more information. The orientation of a linearly polarized electromagn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Circular Polarization
In electrodynamics, circular polarization of an electromagnetic wave is a polarization state in which, at each point, the electromagnetic field of the wave has a constant magnitude and is rotating at a constant rate in a plane perpendicular to the direction of the wave. In electrodynamics, the strength and direction of an electric field is defined by its electric field vector. In the case of a circularly polarized wave, as seen in the accompanying animation, the tip of the electric field vector, at a given point in space, relates to the phase of the light as it travels through time and space. At any instant of time, the electric field vector of the wave indicates a point on a helix oriented along the direction of propagation. A circularly polarized wave can rotate in one of two possible senses: clockwise or ''right-handed circular polarization (RHCP)'' in which the electric field vector rotates in a right-hand sense with respect to the direction of propagation, and counter-clock ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ticonderoga Class Cruiser
The ''Ticonderoga'' class of guided-missile cruisers is a class of warships in the United States Navy, first ordered and authorized in the 1978 fiscal year. The class uses passive phased-array radar and was originally planned as a class of destroyers. However, the increased combat capability offered by the Aegis Combat System and the AN/SPY-1 radar system, together with the capability of operating as a flagship, were used to justify the change of the classification from DDG (guided-missile destroyer) to CG (guided-missile cruiser) shortly before the keels were laid down for and . ''Ticonderoga''-class guided-missile cruisers are multi-role warships. Their Mk 41 VLS can launch Tomahawk cruise missiles to strike strategic or tactical targets, or fire long-range anti-aircraft SM-2MR/ ERs for defense against aircraft or anti-ship missiles. Their LAMPS III helicopters, RUM-139 ASROCs, and sonar systems allow them to perform anti-submarine missions. ''Ticonderoga''-class ships a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kidd Class Destroyer
The ''Kidd''-class destroyers were a series of four guided-missile destroyers (DDGs) based on the . In contrast to their predecessor's focus on anti-submarine warfare, the ''Kidd''s were designed as more advanced multipurpose ships with the addition of considerably enhanced anti-aircraft capabilities. Originally ordered for the former Imperial Iranian Navy, the contracts were canceled when the 1979 Iranian Revolution began, and the ships were completed for the United States Navy. They were decommissioned in 1999 and sold to the Republic of China Navy as the ''Kee Lung'' class. History These destroyers were originally ordered by the last Shah of Iran for service in the Persian Gulf in an air defence role around 1973/74. The original order of six ships was tentatively assigned hull numbers DD 993–998 by the U.S. Navy but it was reduced to four ships after U.S. Congress declined to halt the original production run of 30 ''Spruance'' ships. Compared to the preceding ''Spruance'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spruance Class Destroyer
The ''Spruance''-class destroyer was developed by the United States to replace the many World War II–built - and s, and was the primary destroyer built for the U.S. Navy during the 1970s and 1980s. It was named in honor of United States Navy Admiral Raymond A. Spruance, who successfully led major naval battles in the Asiatic-Pacific Theater during World War II such as the Battle of Midway and the Battle of the Philippine Sea. Introduced in 1975, the class was designed with gas-turbine propulsion, a flight deck and hangar for up to two medium-lift helicopters, all-digital weapons, and automated 127 mm (5-inch) guns. The ''Spruance'' class was originally designed to escort a carrier group, primarily for anti-submarine warfare (ASW), with point-defense anti-aircraft warfare (AAW) missiles and limited anti-ship capabilities. Two dozen members of the class were upgraded with Tomahawk cruise missiles for land attack. The Navy retired the class somewhat earlier than planned, dec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oliver Hazard Perry Class Frigate
The ''Oliver Hazard Perry'' class is a class of guided-missile frigates named after U.S. Commodore Oliver Hazard Perry, the hero of the naval Battle of Lake Erie. Also known as the ''Perry'' or FFG-7 (commonly "fig seven") class, the warships were designed in the United States in the mid-1970s as general-purpose escort vessels inexpensive enough to be bought in large numbers to replace World War II-era destroyers and complement 1960s-era s. pp.42 In Admiral Elmo Zumwalt's "high low fleet plan", the FFG-7s were the low-capability ships, with the s serving as the high-capability ships. Intended to protect amphibious landing forces, supply and replenishment groups, and merchant convoys from aircraft and submarines. They were also later part of battleship-centered surface action groups and aircraft carrier battle groups/strike groups. 55 ships were built in the United States: 51 for the United States Navy and four for the Royal Australian Navy (RAN). Eight were built in Taiwan, six ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Avenger (MCM-1)
USS ''Avenger'' (MCM-1) was the lead ship of her class of mine countermeasures ship, and the third U.S. Navy ship of that name. Service history ''Avenger'' was ordered on 29 June 1982, laid down on 3 June 1983 by the Peterson Shipbuilders Co., Sturgeon Bay, Wisc., launched on 15 June 1985, and commissioned on 12 September 1987. Subsequent to her commissioning and a period of test and trials, ''Avenger'' arrived in her homeport of NS Charleston, South Carolina, and began operating as a member of the U.S. Atlantic Fleet. Following the 1990 Iraqi invasion of Kuwait, ''Avenger'' deployed to the Persian Gulf as a coalition force member in support of Operation Desert Shield and Desert Storm on 16 August 1990. ''Avenger'' was the longest-serving ship from all of the coalition forces during the Shield/Storm conflict, as well as the first ship in the history of naval warfare to locate and neutralize bottom mines. ''Avenger'' was awarded the Navy Unit Commendation and Combat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronics Technician (United States Navy)
The United States Navy job rating of electronics technician (ET) is a designation given by the Bureau of Naval Personnel (BUPERS) to enlisted members who satisfactorily complete initial Electronics Technician "A" school training. History of the Electronics Technician rating WWII era The Electronics Technician (abbreviated as ET) rating was originally established as Radio Technician (abbreviated as RT) in April 1942 during the height of World War II. The story of their training may be found at "Solving the Naval Radar Crisis" by Raymond C Watson, Jr. Trafford Publishing 2007 . The rating insignia adopted was that of the established Radioman (abbreviated as RM) rating, and remained until October 1945, when the rating name was changed to Electronic Technician's Mate (abbreviated as ETM). In 1948, the Navy changed the name of the rating to Electronics Technician, and a new rating insignia was created. Vietnam era to present In 1971 the Radarman (abbreviated as RD) rating was di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Radars
The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, as well as certain large, entirely landlocked, saltwater lakes, such as the Caspian Sea. The sea moderates Earth's climate and has important roles in the water, carbon, and nitrogen cycles. Humans harnessing and studying the sea have been recorded since ancient times, and evidenced well into prehistory, while its modern scientific study is called oceanography. The most abundant solid dissolved in seawater is sodium chloride. The water also contains salts of magnesium, calcium, potassium, and mercury, amongst many other elements, some in minute concentrations. Salinity varies widely, being lower near the surface and the mouths of large rivers and higher in the depths of the ocean; however, the relative proportions of dissolved salts vary li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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