Sonar

Active sonar uses a sound transmitter and a recipient. When the two are in the same place it is monostatic process. When the transmitter and receiver are separated it is bistatic operation. When more transmitters are used, again spatially separated, it is multistatic operation. Most sonars are used monostatically with the same array often being used for enlarge and reception, though when the platform is moving it may be necessary to consider a single transmitter/receiver as being operated bistatically. Active sonobuoy field may be operated multistatically.