Origin of sonarso(und) n(avigation) a(nd) r(anging)
sonar An electrical impulse is converted into sound waves that are transmitted underwater. The sound waves are reflected off objects in their paths, creating echoes that return to the vessel and are picked up by the sonar equipment.
An example of sonar is a system wherein you send out sound waves and see how long it takes to bounce them back in order to try to find out how deep an area is in the Atlantic Ocean.
- A system using transmitted and reflected underwater sound waves to detect and locate submerged objects or measure the distance to the floor of a body of water.
- An apparatus, as one in a submarine, using sonar.
Origin of sonarso(und) na(vigation and) r(anging)
- Short for sound navigation and ranging. A method of detecting, locating, and determining the speed of objects through the use of reflected sound waves. A sound signal is produced, and the time it takes for the signal to reach an object and for its echo to return is used to calculate the object's distance. The Doppler effect can also be used to determine the object's relative velocity. Electronic sonar systems are used for submarine navigation and for detecting schools of fish. Some mammals, especially bats, use biological sonar to navigate and detect prey in dark conditions, commonly called echolocation.
- The equipment or physiology used in doing this.
See also Doppler effect
sonar - Computer Definition
A sonic device used for the detection and location of underwater objects. Active sonar emits sound waves and measures the characteristics of the waves reflected from objects. Passive sonar simply measures the characteristics of sound waves emitted by objects. Sonar determines the range and position of such objects through the use of the Doppler effect, radial component of velocity measurement, and triangulation. See also ping and radar.
- Bathymetry and sidescan sonar imagery together reveal a slow-spreading ridge segment that has a large composite volcanic plateau at its center.
- In the mid-1950s and on into the early seventies, researchers used sonar equipment with mixed results.
- However, many sonar contacts were recorded, and the researchers generally found the evidence to be positive that something large inhabited Loch Ness whether or not it was a descendent of a long-necked aquatic relative of a dinosaur.
- Although many experts dispute witness sightings, the modern video recordings and sonar recordings, Nessie remains a popular urban legend and the most documented example of cryptozoology.
- Despite using sonar equipment and modern technology, to date, scientists have found no conclusive proof of the monster's existence.