SYNOPSIS
"SONAR and Anti-Submarine Warfare" is a course that is suitable for new professionals
and entry level engineers, scientists and computer scientists who require
an understanding of modern active and/or passive sonar system functioning
and performance. The course provides a comprehensive introduction to the topics
of sonar engineering and ocean acoustics as they apply to anti-submarine warfare.
The approach followed in the course emphasizes the concepts underlying each
topic with discussions of numerical examples, at-sea collected data and specific
systems where appropriate. This course stresses intuitive understanding of
the physical and engineering principals underlying the sonar equations which
govern ASW sonar systems and target detection, localization and tracking.
ELIGIBILITY REQUIREMENTS
LEARNING OBJECTIVES
The principal objective of this course is to provide a basic
understanding of the engineering and scientific concepts upon which both active
and passive ASW sonar systems are based. Specific learning objectives are
to gain knowledge and skills in:
COURSE DESCRIPTION
The "SONAR and Anti-Submarine Warfare" course opens with an introduction to the concepts of active and passive ASW sonar systems followed by discussions of the general form of the sonar equations for each of these systems and the basic signal theory behind the sonar equations. Next, the physics of transducers, including sources and receivers, which operate at the interface between the "wet end" (ocean environment) and "dry end" (shipboard processing) of the system are examined. The remainder of the course is basically divided between the"wet-end" and "dry end" subsystems. The principal ocean environment topics discussed include the physics of acoustic propagation in the ocean from the standpoint of ray theory, followed by discussions of submarine target acoustics, ocean acoustic noise and reverberation. The principal shipboard processing topics discussed include active detection using CW, LFM and HFM waveforms and passive detection of NB and BB waveforms. Active and passive target localization and target tracking are also covered. The course concludes with discussions of overall system performance in typical environments.
COURSE OUTLINE
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Sonar System Fundamentals Sonar System Concepts & Sonar Equations Signal Theory for ASW Sonar Transducers Electroacoustic Transducer Analysis Projector Analysis Hydrophone Analysis Transmitting and Receiving Response Radiation from Projectors Reception by Hydrophone Arrays Linear & Twin-Line Arrays Ocean Acoustics Sound Speed Variations Ray Theory Surface Reflections Bottom Reflections Acoustic Absorption Acoustic Propagation in the Ocean Surface Shadow Zone Surface Duct Duct - Axial Transmissions
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Convergence Zones Target Acoustics Temporal Structures of Echoes Passive Signatures of Targets Doppler Shifting of Signals Noise and Reverberation Statistics Noise in the Ocean Reverberation in the Ocean Detection Fundamentals Active and Passive Detection Concepts Active CW, LFM & HFM Waveforms Passive NB & BB Waveforms Target Tracking ab Trackers The Predictor-Corrector Tracker Multi-Target Multi-Sensor Tracking Operational Performance
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