CRL708

CRL708
Sonar System Engineering
Credits	3
Structure	3-0-0
Pre-requisites
Overlaps

CRL708 : Sonar System Engineering

Introduction to Sonar applications, Units, Sonar Equations and their limitations, Propagation of sound, Transmission loss, Ambient Noise, Spatial Correlation, Directivity Index, Array Gain, Beam-patterns, Projector Source level, Reverberation, Scattering by targets, echo formation, Radiated Noise and Self Noise, Transmission and Reception modes, Dynamic Range Compression and Normalisation, Receiver Beamforming techniques, Sidelobe nulling, Detection Performance issues, Performance prediction, Sonar System Design examples. CRL709 Underwater Electronic Systems 3 Credits, (3-0-0) Introduction to High Resolution Underwater Imaging Applications, Sidescan Sonar principles, Sector Scan Sonar Principles: Principle of within-pulse scanning, role of grating lobe in sector coverage, Swept-frequency delay line scanning technique, Time-Delay-Integrate scanning technique, Modulation Scanning Technique: Multi-stage scanning, Spatial DFT-based imaging technique, True Phase-Shift beamforming: Near-field focusing, Hilbert-transform based implementation, Synthetic Aperture Sonar: range migration issue, PRF limits, swath coverage, real beam pattern effects, tow-body precision issues, CTFM Sonar, Dual Demodulation CTFM Sonar Phase-Difference based SAS, Radial Projection method of imaging, Monopulse technique, Navigation: Doppler Log, JANUS system, Localization: LBL (Long baseline), SBL (Short baseline), SSBL/USBL (super/ultra short baseline), requirements of tracking and positioning systems, hyperbolic and spherical-based localization using pingers and transponders, Passive Inverse Synthetic Aperture for localizing radiated tonals from moving platforms, Underwater Acoustic Communication Modems and their applications.