REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

SONARS FOR DETECTING SMALL SUBMERGED OBJECTS
AND DEFINING THEIR SHAPES

MIODRAG VRAČAR

Military Technical Institute, Belgrade, vracarmiodrag@open.telekom.rs

Abstract: Sonar for detecting small-submerged objects and defining their shapes operate at relatively high frequencies, higher than few hundred kilohertz, in order obtain the narrow beams and short pulse lengths required to reduce the reverberation accompanying echoes. The main principles of such types of sonar are discussed. In addition, principles for obtaining narrow beams are discussed and particular attention is directed to parametric acoustic radiator.

Key words: sonar, parametric acoustic radiator, beamformer.