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It was developed during World War I to counter the growing threat of submarine warfare, with an operational passive sonar system in use by 1918. [3] Modern active sonar systems use an acoustic transducer to generate a sound wave which is reflected from target objects. [3]
Radar in World War II greatly influenced many important aspects of the conflict. [ 1 ] This revolutionary new technology of radio-based detection and tracking was used by both the Allies and Axis powers in World War II, which had evolved independently in a number of nations during the mid 1930s. [ 2 ] At the outbreak of war in September 1939 ...
Asdic was the British version of sonar developed at the end of World War I based on the work of French physicist Paul Langevin and Russian engineer M. Constantin Chilowsky. The system was developed as a means to detect and locate submarines by their reflection of sound waves. By the start of World War II in 1939, most British destroyers and ...
This is a list of World War II electronic warfare equipment and code words and tactics derived directly from the use of electronic equipment. This list includes many examples of radar, radar jammers, and radar detectors, often used by night fighters; also beam-guidance systems and radio beacons. Many of the British developments came from the ...
It initially used a war-surplus GL-II radar system operating at 71 MHz (4.2 m). The first observations were of ionized trails in the Geminids meteor shower during December 1945. While the facility soon evolved to become the third largest radio observatory in the world, some radar astronomy continued.
SOSUS. Sound Surveillance System (SOSUS) was the original name for a submarine detection system based on passive sonar developed by the United States Navy to track Soviet submarines. The system's true nature was classified with the name and acronym SOSUS classified as well. The unclassified name Project Caesar was used to cover the installation ...
Ta-Chi 13 Aircraft Guidance System. Ta-Chi 18 TypeB Portable Early Warning Device (Portable Early Warning Device "Otsu") - 3 meter band (100 MHz) - 400 built. Ta-Chi 20 Fixed Early Warning Device Receiver (for Ta-Chi 6) Ta-Chi 24 Mobil Anti-Aircraft Radar (Japanese-built Würzburg radar) Ta-Chi 28 Aircraft Guidance Device. Ta-Chi 31 Ground ...
Battle of the Beams. The Battle of the Beams was a period early in the Second World War when bombers of the German Air Force (Luftwaffe) used a number of increasingly accurate systems of radio navigation for night bombing in the United Kingdom. British scientific intelligence at the Air Ministry fought back with a variety of their own ...