Sound Navigation and Ranging SONAR

Since it is most common from the beginning, there is no image SONAR. Animals have used this technique and have survived millions of years. The most common of these are bats and dolphins. In 1822, Daniel Colloden used the bell to measure the speed of the underwater sound. After the sinking of the Titanic, the inventor used the idea of ​​using sound to detect objects (mainly icebergs) underwater. One month after the Titanic sank, meteorologist Luis Richardson first applied for echo locator patents.

Sound navigation and ranging. The acronym of SONAR generally explains submarine detection technology and comes from the American terminology of World War II. The acronym SONAR, the natural sister expression of RADAR (abbreviated in abbreviation and abbreviation in strict sense) is like RADAR entered the language in the form of words many years ago. The equivalent of Britain's SONAR is ASDICS, which represents the anti-submarine exploration and investigation committee. It is easy to understand why the SONAR version is popular.

Sonar means that the navigation and ranging of the sound is a technique for navigating, communicating, or detecting other ships using sound propagation (usually underwater like submarine navigation) . Two kinds of technologies share the name "sonar": passive sonar is basically listening to the sound of the ship; active sonar will emit a pulse of sound and hear echo. Sonar can be used as a means to acoustically locate and measure the echo generation characteristics of underwater "target". Please use the acoustic position in the air before introducing the radar. Sonar can also be used in the air for navigation of the robot, SODAR will refer to aerial sonar for atmospheric survey. The term sonar is also used in devices that generate and receive sound. The sound used in the sonar system ranges from very low (very low frequency) to very high (ultrasound). Underwater acoustic research is called underwater acoustics or underwater acoustics