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Informationen zum Autor RICHARD P. HODGES has forty years experience in sonar, operations analysis, modeling, and the simulation of military systems. He is currently working for Sonalysts, Inc as a principal analyst, and is a member of the Acoustic Society of America. He has taught courses at the Naval Underwater Warfare Center (NUWC) and elsewhere in naval analysis of sonar, acoustics, TMA, tactics, weapons, damage and kill mechanisms, C4I, non-acoustic sensors, platform dynamics weapons, tactics and on the use of NUWC's SIM II Naval Engagement Simulation. Klappentext Offering complete and comprehensive coverage of modern sonar spectrum system analysis, Underwater Acoustics: Analysis, Design and Performance of Sonar provides a state-of-the-art introduction to the subject and has been carefully structured to offer a much-needed update to the classic text by Urick. Expanded to included computational approaches to the topic, this book treads the line between the highly theoretical and mathematical texts and the more populist, non-mathematical books that characterize the existing literature in the field. The author compares and contrasts different techniques for sonar design, analysis and performance prediction and includes key experimental and theoretical results, pointing the reader towards further detail with extensive references. Practitioners in the field of sonar design, analysis and performance prediction as well as graduate students and researchers will appreciate this new reference as an invaluable and timely contribution to the field.Chapters include the sonar equation, radiated, self and ambient noise, active sonar sources, transmission loss, reverberation, transducers, active target strength, statistical detection theory, false alarms, contacts and targets, variability and uncertainty, modelling detections and tactical decision aids, cumulative probability of detection, tracking target motion analysis and localization, and design and evaluation of sonars Zusammenfassung Offering complete and comprehensive coverage of modern sonar spectrum system analysis, Underwater Acoustics: Analysis, Design and Performance of Sonar provides a state-of-the-art introduction to the subject and has been carefully structured to offer a much-needed update to the classic text by Urick. Inhaltsverzeichnis About the Author xiii Preface xv Acknowledgements xvii 1 Introduction to Sonar 1 1.1 Acoustic Waves 1 1.1.1 Compressions and Rarefactions 3 1.2 Speed of Propagation 4 1.3 Acoustic Wave Parameters 5 1.4 Doppler Shift 9 1.5 Intensity, SPL, and Decibels 10 1.6 Combining Acoustic Waves 11 1.7 Comparative Parameter for Sound in Water and Air 14 References 15 2 The Sonar Equations 17 2.1 Signal-to-Noise Ratio 17 2.2 Active Sonar Equation 18 2.3 Signal Excess 20 2.4 Figure of Merit 20 References 21 3 Transducers, Directionality, and Arrays 23 3.1 Transducer Response 25 3.2 Beam Pattern Response 25 3.3 Linear Arrays 27 3.3.1 Triplet Towed Array 33 3.3.2 Multiline Towed Arrays 33 3.4 Rectangular Planar Array 33 3.5 Amplitude Shading 37 3.6 Continuous Arrays 37 3.7 Volumetric Arrays 41 3.8 Product Theorem 44 3.9 Broadband Beam Patterns 45 3.10 Directivity and Array Gain 45 3.11 Noise Cross-Correlation between Hydrophones 47 3.12 Directivity of Line Arrays 49 3.13 Directivity of Area Arrays 51 3.14 Directivity of Volumetric Arrays 52 3.15 Difference Arrays 54 3.16 Multiplicative Arrays 57 3.17 Sparsely Populated Arrays 59 3.18 Adaptive Beamforming 60 References 62 4 Active Sonar Sources 63 4.1 Source Level 63 4.2 Cavitation 64 4.3 Near-Field Interactions 67 4.4...
