Sonar is a technique that uses sound propagation to navigate, measure distances (ranging), communicate with or detect objects on or under the surface of the water, such as other vessels. Two types of technology share the name "sonar": passive sonar is essentially listening for the sound made by vessels; active sonar is 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 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 extremely high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics.
The Arleigh Burke class of guided missile destroyers (DDGs) is a United States Navy class of destroyer built around the Aegis Combat System and the SPY-1D multi-function passive electronically scanned array radar. The class is named for Admiral Arleigh Burke, an American destroyer officer in World War II, and later Chief of Naval Operations. The lead ship, USS Arleigh Burke, was commissioned during Admiral Burke's lifetime.
The Sound Surveillance System (SOSUS) was a passive sonar system developed by the United States Navy to track Soviet submarines. The system's true nature was classified with the name and acronym SOSUS themselves classified. The unclassified name Project Caesar was used to cover the installation of the system and a cover story developed regarding the shore stations, identified only as a Naval Facility (NAVFAC), being for oceanographic research. In 1985, as the fixed bottom arrays were supplemented by the mobile Surveillance Towed Array Sensor System (SURTASS) and other new systems were coming on line, the name itself changed to Integrated Undersea Surveillance System (IUSS). The commands and personnel were covered by the "oceanographic" term until 1991 when the mission was declassified. As a result, the commands, Oceanographic System Atlantic and Oceanographic System Pacific became Undersea Surveillance Atlantic and Undersea Surveillance Pacific, and personnel were able to wear insignia reflecting the mission.
The 46 Knox-class frigates were the largest, last, and most numerous of the US Navy's second-generation anti-submarine warfare (ASW) escorts. Originally laid down as ocean escorts, they were all redesignated as frigates on 30 June 1975, in the 1975 ship reclassification plan and their hull designation changed from 'DE' to 'FF'. The Knox class was the Navy's last destroyer-type design with a steam turbine powerplant.
Naval Tactical Data System (NTDS) was a computerized information processing system developed by the United States Navy in the 1950s and first deployed in the early 1960s for use in combat ships. It took reports from multiple sensors on different ships and collated it to produce a single unified map of the battlespace. This information could then be relayed back to the ships and to the weapons operators.
The Brahmaputra-class frigates are guided-missile frigates of the Indian Navy, designed and built in India. They are an enhancement of the Godavari class, with a displacement of 3850 tons and a length of 126 metres (413 ft). Although of similar hull and dimension, internally, the Brahmaputra and Godavari classes have different configurations, armaments and capabilities. 3 ships of this class serve in the Indian Navy.
The Navy Enlisted Classification (NEC) system supplements the rating designators for enlisted members of the United States Navy. A naval rating and NEC designator are similar to the Military Occupational Specialty (MOS) designators used in the U.S. Army and U.S. Marine Corps and the Air Force Specialty Code (AFSC) used in the U.S. Air Force.
The Murasame-class destroyer is a class of destroyers, serving with the Japan Maritime Self-Defense Force (JMSDF). This is the first class of the second-generation general-purpose destroyers of the JMSDF.
Lockheed Martin Rotary and Mission Systems , is a Lockheed Martin business segment, headquartered in Washington, DC. Until October 2008 RMS was headquartered in Moorestown Township, New Jersey, a suburb of Philadelphia; Moorestown remains one of the largest sites in the business unit and is where many of the unit's top executives have their offices. As of 2013, RMS is one of Lockheed Martin's five operating units; prior to that it was a part of the now-defunct Electronic Systems sector. RMS was formerly known as Mission Systems and Sensors, and then as Mission Systems & Training. MST was composed of several other Lockheed Martin business areas and operating groups, including Maritime Systems and Sensors (MS2) / Naval Electronics and Surveillance Systems (NESS) and Lockheed Martin Systems Integration. Stephanie Hill is the current executive vice president of RMS.
The Akizuki class of destroyers of the Japan Maritime Self-Defense Force is intended to escort the Hyūga-class and Izumo-class helicopter destroyers, and safeguard the other Aegis-capable warships such as the Kongō class and Atago class. The destroyer provides defense against surface, airborne and undersea threats. The class was initially designated as "19DD", referring to a date on the Japanese calendar, specifically the 19th fiscal year of the Heisei period (2007).
The Naval Aircrewman rating is an enlisted rating of the US Navy. It was previously designated as aviation anti-submarine warfare operator. However, under the CNO-directed "Helicopter Master Plan", all 78XX and 94XX aircrewmen were re-designated as "aviation warfare systems operators". The description of the Naval Aircrew Rate (AW) on this page define only the "Active Duty" aspects of the AW rate, fleets (aircraft), positions, and duties that are manned by aircrew in today's Navy. The Full Time Support (FTS) and Selected Reserves (SELRES) components of the U.S. Naval Reserves make up the largest number of Aircrew in today's Navy. Many technologically advanced navies have a similar trade.
Geophysical MASINT is a branch of Measurement and Signature Intelligence (MASINT) that involves phenomena transmitted through the earth and manmade structures including emitted or reflected sounds, pressure waves, vibrations, and magnetic field or ionosphere disturbances.
AN/SQS-26 was a United States Navy surface ship, bow mounted, low frequency, active/passive sonar developed by the Naval Underwater Sound Laboratory and built by General Electric and the EDO Corporation. At one point, it was installed on 87 US Navy warships from the 1960s to the 1990s and may still be in use on ships transferred to other navies.
The Operational Test and Evaluation Force (OPTEVFOR) serves as an independent and objective agency within the United States Navy for the operational testing and evaluation (OT&E) of naval aviation, surface warfare, submarine warfare, C4I, cryptologic, and space systems in support Navy and U.S. Department of Defense acquisition programs.
Naval tactics play a crucial role in modern battles and wars. The presence of land, changing water depths, weather, detection and electronic warfare, the speed at which actual combat occurs and other factors — especially air power — have rendered naval tactics essential to the success of any naval force.
The Nilgiri-class frigates, formally classified as the Project-17 Alpha frigates (P-17A), are a series of guided-missile frigates currently being built by Mazagon Dock Shipbuilders (MDL) and Garden Reach Shipbuilders & Engineers (GRSE), for the Indian Navy.
The ASW Continuous Trail Unmanned Vessel (ACTUV) is a DARPA funded project launched in early 2010 to develop an anti-submarine drone. ASW is an acronym for Anti-Submarine Warfare. In January 2018 after successful sea trials it was announced that the "Sea Hunter" prototype has transitioned from DARPA to the Office of Naval Research for further development.
INS Kadmatt (P29) is the second of four anti-submarine warfare corvettes built for the Indian Navy by the Garden Reach Shipbuilders and Engineers of Kolkata under Project 28. She was inducted into the Eastern Naval Command of the Indian Navy.
HELRAS or the Helicopter Long Range Active Sonar is a naval helicopter undersea sensor, a dipping sonar, deployed by helicopters of many naval air forces around the world to detect submarines; it is a form of geophysical MASINT.
