Corrections to the sonar equation
Publish date: 2015-03-27
Report number: FOI-R--3983--SE
Pages: 27
Written in: Swedish
Keywords:
- Sonar
- support systems
- the sonar equation
- calculations of sonar performance
Abstract
In tactical support systems for sonars in operational use on surface ships, submarines and helicopters, it is essential that the range and detection performance of sonar systems can be assessed. The normal use of the sonar equations means idealizations which give a simplified description of the sonar systems and the environment in which the system operates. These simplifications normally results in larger ranges and enhanced detection performance in comparison to what is achieved in reality. Realistic estimations of sonar system performance require the introduction of corrections to the sonar equations. In this report corrections are proposed associated with the environment, transmitter, receiver and display systems of sonars, as well as the capability of operators. In addition to analysis of data from sea-trials and simulations at FOI, measurements have to be carried out during operational use of sonars on surface ships, submarines and helicopters. Thereby it is important that hydrophone- and beam signals are registered, as well as the judgment of the operators when targets are present and classified, and the characterization of the environment and target. To improve the tactical support systems, research personnel should have an opportunity to participate at sea-trials/exercises with operational systems like the Visby corvette, submarine and Helicopter 14.