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Informationen zum Autor Jean-Paul Marage is currently retired from his main activities as an electronic engineer. He has formerly held positions as a CNAM electronic engineer; an Ecole Supérieure d'Electricité engineer for SUPELEC Paris; and was Manager, for 25 years, of the Research and development laboratory at Thales Underwater Systems, Sophia Antipolis, France. He also worked as an acoustic and electronic sonar system expert for 5 years and a CNAM (Conservatoire National des Arts et Métiers) teacher in electronics for 25 years. Yvon Mori , Consultant, France. Although retired from his main activities as an electronic engineer, he is still Chairman of the SEE French Riviera (Société de l'Electricité, de l'Electronique et des Technologies de l'Information et de la Communication) and the IEEE in France. He is also a COFRAC Auditor for programme 38 and trains engineers in mechanical vibration, shock analysis and electromagnetic compatibility for major companies. Before retirement he was, for 37 years, the manager of the environmental test and evaluation laboratory at Thales Underwater Systems in Sophia Antipolis, France. Klappentext Sonar and Underwater Acoustics brings together all the concepts necessary for designers and users of sonar systems. Unlike other books on this subject, which are often too specialized, this book is accessible to a wider audience. The first part focuses on the acoustic environment, antenna structures, and electric acoustic interface. The latter provides knowledge required to design, as well as the development and implementation of chain processes for an active sonar from the conditioning input to output processing. The reader will find a comprehensive range of all problems encountered in underwater acoustics for a sonar application, from physical phenomena governing the environment and the corresponding constraints, through to the technical definition of transducers and antennas, and the types of signal processing involved. In one section, measures in underwater acoustics are also proposed. Zusammenfassung Sonar and Underwater Acoustics brings together all the concepts necessary for designers and users of sonar systems. Unlike other books on this subject, which are often too specialized, this book is accessible to a wider audience. The first part focuses on the acoustic environment, antenna structures, and electric acoustic interface. Inhaltsverzeichnis Preface ix PART 1. THE MARINE ENVIRONMENT 1 Part 1. Introduction 3 Chapter 1. Problematics 5 1.1. History 5 1.2. Underwater acoustics 7 1.3. Applications 9 1.4. Comparison with radar 10 1.5. Submarine detection and warfare 11 1.6. Submarine detection 11 1.7. Submarine detection: a veritable challenge 12 1.8. Overcoming the effects of the ocean 13 1.9. Sonar and information processing 16 Chapter 2. Sound Propagation in the Marine Environment 19 2.1. General points 19 2.2. Characteristics of the marine environment 19 2.3. Models used 22 2.4. Propagation phenomena 28 2.5. Application examples 33 Chapter 3. Noises and Reverberation 41 3.1. Classification of ambient noises 41 3.2. Analysis of noise sources 45 3.3. Wenz' model of sea noise 51 3.4. Directivity of sea noise 52 3.5. Reverberation 55 Chapter 4. Radiated and Inherent Noises 65 4.1. Radiated noise 65 Chapter 5. Transmission of the Acoustic Signal: Sonar Equations 79 5.1. Introduction 79 5.2. Detection contrast and detection index 80 5.3. Transmission equation 81 5.4. Equation of passive sonar 88 5.5. Equation of active sonar 89 PART 2. ACOUSTIC-ELECTRIC INTERFACE ANTENNA STRUCTURES 93 Part 2. Introduction 95 Chap...
