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The demand to explore the largest and also one of the richest parts of our planet, the advances in signal processing promoted by an exponential growth in computation power and a thorough study of sound propagation in the underwater realm, have lead to remarkable advances in sonar technology in the last years.The work on hand is a sum of knowledge of several authors who contributed in various aspects of sonar technology. This book intends to give a broad overview of the advances in sonar technology of the last years that resulted from the research effort of the authors in both sonar systems and their applications. It is intended for scientist and engineers from a variety of backgrounds and even those that never had contact with sonar technology before will find an easy introduction with the topics and principles exposed here.

Sonar. --- Asdic --- Echo ranging --- Sound navigation ranging --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Underwater acoustics --- Electronic devices & materials

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This book is concerned with the theory, development and design of electroacoustic transducers for underwater applications, and is more comprehensive than any existing book in this field. It includes the basics of the six major types of electroacoustic transducers, with emphasis on the piezoelectric ceramic transducers that are currently most widely used. It presents the basic acoustics, as well as specific acoustic data, needed in transducer design and includes analysis of nonlinear effects in transducers. A large number of specific transducer designs, including both projectors and hydrophones, are described in detail as well as methods of modeling, evaluation and measurement. Analysis of transducer arrays, including the effects of mutual radiation impedance, as well as numerical models for transducers and arrays are also covered. The book contains an extensive Appendix of useful current information, including data on the latest transduction materials, and numerous diagrams that will facilitate its use by students and practicing engineers and scientists.

Engineering sciences. Technology --- Computer. Automation --- beeldverwerking --- ingenieurswetenschappen --- signaalverwerking --- Underwater acoustics --- Transducers. --- Sonar. --- Instruments. --- Asdic --- Echo ranging --- Sound navigation ranging --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Electric apparatus and appliances --- Electromechanical devices --- Electronic apparatus and appliances

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The aim of this Special Issue is to gather recent advances and development in target tracking techniques to determine how they can be adapted for modern radar and sonar systems. After peer review, 17 articles in related areas have been accepted for publishing in this Special Issue. The published articles cover a range of topics and applications central to target tracking. There are eight papers about general multi-target tracking, including the topics of joint tracking and classification [3], adaptive estimation using clutter measurement probability [6], joint localization and tracking [7], extended target tracking [8], tracking with smoothing [11], DOA tracking [12], tracking under low detection probability [14], and sonar tracking and interception [17]. Three papers address multi-sensor multi-target tracking methods. Specifically, a multi-target estimating method for pulsed radar systems is proposed in [2], a joint dwell time and bandwidth optimization method in a radar network is proposed in [4], a and multiple marine ship tracking method with unknown backgrounds is presented in [9]. There are 2 papers [10,15] on the problem of target assignment in multi-sensor multi-target tracking. Moreover, Mallick et al. considered measures of nonlinearity of a polynomial curve in two dimensions [1], Zhao et al. explored the use of calibration targets for which the positions are known to the MPR system, to counter the loss in target localization accuracy arising from transmitter/receiver position errors [13], and Li et al. proposed an algorithm to apply the frequency diversity technique to passive azimuth estimation in [16].

Radio frequency. --- Sonar. --- Asdic --- Echo ranging --- Sound navigation ranging --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Underwater acoustics --- Radiofrequency --- Frequencies of oscillating systems --- Radio measurements --- Radio waves

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"Digital Sonar Design in Underwater Acoustics Principles and Applications" provides comprehensive and up-to-date coverage of research on sonar design, including the basic theory and techniques of digital signal processing, basic concept of information theory, ocean acoustics, underwater acoustic signal propagation theory, and underwater signal processing theory. This book discusses the general design procedure and approaches to implementation, the design method, system simulation theory and techniques, sonar tests in the laboratory, lake and sea, and practical validation criteria and methods for digital sonar design. It is intended for researchers in the fields of underwater signal processing and sonar design, and also for navy officers and ocean explorers. Qihu Li is a professor at the Institute of Acoustics, Chinese Academy of Sciences, and an academician of the Chinese Academy of Sciences.

Digital sonar. --- Sonar. --- Underwater acoustics -- Instruments. --- Underwater acoustics -- Measurement. --- Sonar --- Underwater acoustics --- Physics --- Military & Naval Science --- Law, Politics & Government --- Physical Sciences & Mathematics --- Acoustics & Sound --- Naval Architecture --- Instruments --- Instruments. --- Asdic --- Echo ranging --- Sound navigation ranging --- Physics. --- Geophysics. --- Oceanography. --- Acoustics. --- Electrical engineering. --- Electrical Engineering. --- Geophysics/Geodesy. --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Computer engineering. --- Physical geography. --- Geography --- Oceanography, Physical --- Oceanology --- Physical oceanography --- Thalassography --- Earth sciences --- Marine sciences --- Ocean --- Computers --- Design and construction --- Geological physics --- Terrestrial physics --- Electric engineering --- Engineering

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Submarine geology --- -Ocean --- -Sonar. --- 551.46 --- 550.834 --- Asdic --- Echo ranging --- Sound navigation ranging --- Detectors --- Electronics in navigation --- Signals and signaling, Submarine --- Ultrasonic equipment --- Underwater acoustics --- Oceans --- Sea, The --- Bodies of water --- Oceanography --- Geological oceanography --- Geology, Submarine --- Marine geology --- Geology --- Pictorial works --- Physical oceanography. Submarine topography. Ocean floor --- Application of elastic waves for investigating the Earth's uppermost strata. Seismic and acoustic sounding methods --- 550.834 Application of elastic waves for investigating the Earth's uppermost strata. Seismic and acoustic sounding methods --- 551.46 Physical oceanography. Submarine topography. Ocean floor --- Ocean --- Sonar