Underwater Acoustics and Ocean Dynamics : Proceedings of the 4th Pacific Rim Underwater Acoustics Conference

These Proceedings Are A Collection Of 16 Selected Scientific Papers And Reviews By Distinguished International Experts That Were Presented At The 4th Pacific Rim Underwater Acoustics Conference (pruac), Held In Hangzhou, China In October 2013. The Topics Discussed At The Conference Include Internal Wave Observation And Prediction; Environmental Uncertainty And Coupling To Sound Propagation; Environmental Noise And Ocean Dynamics; Dynamic Modeling In Acoustic Fields; Acoustic Tomography And Ocean Parameter Estimation; Time Reversal And Matched Field Processing; Underwater Acoustic Localization And Communication As Well As Measurement Instrumentations And Platforms. These Proceedings Provide Insights Into The Latest Developments In Underwater Acoustics, Promoting The Exchange Of Ideas For The Benefit Of Future Research. Inference Of Sound Attenuation In Marine Sediments From Modal Dispersion In Shallow Water -- Distributed Underwater Sensing: Applications And Challenges -- Counterintuitive Results In Underwater Acoustic Communications -- Comparisons Of Methods For Numerical Internal Wave Simulation In Long Range Acoustical Propagation -- Acoustic Data Assimilation: Concepts And Examples -- The Preliminary Results Of A Single-hydrophone Geoacoustic Inversion For Data Collected At The Sea Of Japan -- Measurements Of Ultrasound Attenuation Of Suspended Particles With Various Size Distributions -- A Low Complexity Multichannel Adaptive Turbo Equalizer For A Large Delay Spread Sparse Underwater Acoustic Channel -- A Turbo Equalization Based On A Sparse Doubly Spread Acoustic Channels Estimation -- Design And Testing Of Underwater Acoustic Communications For An Auv -- Hydroflown™: Mems Based Underwater Vector Sensors And Applications -- Axis Mismatches Between Pairs Of Sensitive Elements Of Underwater Acoustic Velocity Gradient Sensors -- A Passive Fathometer Technique For Bottom Profiling Using Ambient Noise Target Motion Parameter Estimation For Lofargrams Based On Waveguide Invariants -- Source Localization By Maximizing The Longitudinal Correlation Using Waveguide Invariant Theory -- Selective Detection And Localization By Decomposition Of A Subrank Time Reversal Operator -- Sounds Of Undersea Gas Leaks -- Multi-auv Localization For An Underwater Acoustic Sensor Network. Edited By Lisheng Zhou, Wen Xu, Qianliu Cheng, Hangfang Zhao. Preface 5 Organization Committee 6 Scientific Program Committee 6 Organizing Committee 6 Sponsors 6 Contents 8 1 Inference of Sound Attenuation in Marine Sediments from Modal Dispersion in Shallow Water 10 Abstract 10 1 Introduction 10 2 Inversion by Time-Warping 12 2.1 Mode Relationships 12 2.2 Time-Warping 13 2.3 Inversion in the Warped Space 15 3 Inversion of Sound Attenuation 15 4 Conclusion 18 References 18 2 Counterintuitive Results in Underwater Acoustic Communications 19 Abstract 19 1 Introduction 19 2 The Rayleigh Parameter 20 3 Communications Performance 22 4 Performance Prediction Modeling 24 Acknowledgments 25 References 25 3 Comparisons of Methods for Numerical Internal Wave Simulation in Long-Range Acoustical Propagation 27 Abstract 27 1 Background 27 2 Algorithm 28 3 Validation 30 4 Comparisons 32 Acknowledgments 33 References 33 4 Acoustic Data Assimilation: Concepts and Examples 34 Abstract 34 1 Introduction 35 2 Concepts of Acoustic Data Assimilation 35 2.1 Data 36 2.2 Models 36 2.3 Assimilation Methodology 36 3 Current Status and Main Results 37 3.1 MIT Ocean Acoustic Tomography Framework 37 3.2 Harvard Ocean Prediction System 38 3.3 Focused Acoustic Forecasting-05 38 3.4 Battlespace Preparation 2007 39 3.5 Quantifying, Predicting, and Exploiting Uncertainty 40 4 Conclusions and Future Trends 41 Acknowledgments 41 References 41 5 The Preliminary Results of a Single-Hydrophone Geoacoustic Inversion for Data Collected at the Sea of Japan 43 Abstract 43 1 Introduction and Experiments Description 43 2 Warping-Based Inversion Algorithm Outline 45 3 Application of the Inversion Scheme to Our Data 46 4 Results and Discussion 48 Acknowledgments 49 References 49 6 Measurements of Ultrasound Attenuation of Suspended Particles with Various Size Distributions 50 Abstract 50 1 Introduction 50 2 Laboratory Measurements 51 3 Results 51 Acknowledgments 52 References 52 7 A Low Complexity Multichannel Adaptive Turbo Equalizer for a Large Delay Spread Sparse Underwater Acoustic Channel 53 Abstract 53 1 Introduction 54 2 Proposed Sparse Equalizer 54 3 Adaptive Turbo Equalizer with Sparse Taps 55 4 Shallow Sea Experiment 57 Acknowledgments 59 References 59 8 A Turbo Equalization Based on a Sparse Doubly Spread Acoustic Channels Estimation 60 Abstract 60 1 Introduction 60 2 Theory 61 3 Simulation Results 63 References 64 9 Design and Testing of Underwater Acoustic Communications for an AUV 65 Abstract 65 1 Introduction 65 2 Spread Spectrum Acoustic Communication 66 2.1 Signals Design 66 2.2 Communication Modes 67 2.3 Doppler Estimation and Compensation 67 3 OFDM Acoustic Communication 68 3.1 Signals Design 68 3.2 Doppler Estimation and Compensation 69 4 Time Reversal Process 69 4.1 Signal Frame Format 69 4.2 Receiver Process 69 5 Modem Equipment 70 6 Experiment Description and Results 71 7 Summary and Future Work 72 Acknowledgments 72 References 72 10 Research of Axis Mismatches Between Pairs of Sensitive Elements of Underwater Acoustic Velocity Gradient Sensors 73 Abstract 73 1 Introduction 73 2 Taylor Series Expansion of an Acoustic Pressure Field 74 3 Structure of Velocity Gradient Sensors 75 4 A Velocity Gradient Sensor in a Plane Wave Field 75 5 Axis Mismatches Between Pairs of Vector Sensors 77 6 Conclusion 80 Acknowledgments 81 References 81 11 A Passive Fathometer Technique for Bottom Profiling Using Ambient Noise 82 Abstract 82 1 Introduction 82 2 Acoustic Measurements 83 3 Results 83 Acknowledgments 84 References 84 12 Target Motion Parameter Estimation for LOFARgrams Based on Waveguide Invariants 85 Abstract 85 1 Introduction 86 2 Theory 87 2.1 Detection Model 87 2.2 Estimation Method 88 3 Simulation 90 4 Conclusion 91 Acknowledgments 92 References 92 13 Source Localization by Maximizing the Longitudinal Correlation Using Waveguide Invariant Theory 93 Abstract 93 1 Introduction 93 2 Theory 94 3 Simulations 95 4 Experimental Data Analysis 97 5 Conclusion 98 References 98 14 Selective Detection and Localization by Decomposition of a Subrank Time Reversal Operator 99 Abstract 99 1 Introduction 100 2 Theory 100 3 Experimental Setup and Signal Processing 101 4 Experimental Results 102 5 Conclusion 104 Acknowledgments 105 References 105 15 Sounds of Undersea Gas Leaks 106 Abstract 106 1 Introduction 106 2 Model 107 3 Rigid Bottom Solution 108 4 Comparison with the Field Experiment 110 5 Impedance Boundary Condition 112 6 Discussion and Conclusions 114 Acknowledgments 114 References 114 16 Multi-AUV Localization for an Underwater Acoustic Sensor Network 116 Abstract 116 1 Introduction 116 2 Multi-AUV Localization Scheme 118 2.1 Network and Scheme Model 118 2.2 Range-Based Localization 119 3 Theoretical Performance Analysis 120 4 Simulation 122 5 Conclusion and Future Work 125 References 126 These Proceedings Are A Collection Of 16 Selected Scientific Papers And Reviews By Distinguished International Experts That Were Presented At The 4th Pacific Rim Underwater Acoustics Conference (pruac), Held In Hangzhou, China In October 2013. The Topics Discussed At The Conference Include Internal Wave Observation And Prediction; Environmental Uncertainty And Coupling To Sound Propagation; Environmental Noise And Ocean Dynamics; Dynamic Modeling In Acoustic Fields; Acoustic Tomography And Ocean Parameter Estimation; Time Reversal And Matched Field Processing; Underwater Acoustic Localization And Communication As Well As Measurement Instrumentations And Platforms. These Proceedings Provide Insights Into The Latest Developments In Underwater Acoustics, Promoting The Exchange Of Ideas For The Benefit Of Future Research. Inference Of Sound Attenuation In Marine Sediments From Modal Dispersion In Shallow Water -- Distributed Underwater Sensing: Applications And Challenges -- Counterintuitive Results In Underwater Acoustic Communications -- Comparisons Of Methods For Numerical Internal Wave Simulation In Long Range Acoustical Propagation -- Acoustic Data Assimilation: Concepts And Examples -- The Preliminary Results Of A Single-hydrophone Geoacoustic Inversion For Data Collected At The Sea Of Japan -- Measurements Of Ultrasound Attenuation Of Suspended Particles With Various Size Distributions -- A Low Complexity Multichannel Adaptive Turbo Equalizer For A Large Delay Spread Sparse Underwater Acoustic Channel -- A Turbo Equalization Based On A Sparse Doubly Spread Acoustic Channels Estimation -- Design And Testing Of Underwater Acoustic Communications For An Auv -- HydroflownTM: Mems Based Underwater Vector Sensors And Applications -- Axis Mismatches Between Pairs Of Sensitive Elements Of Underwater Acoustic Velocity Gradient Sensors -- A Passive Fathometer Technique For Bottom Profiling Using Ambient Noise Target Motion Parameter Estimation For Lofargrams Based On Waveguide Invariants -- Source Localization By Maximizing The Longitudinal Correlation Using Waveguide Invariant Theory -- Selective Detection And Localization By Decomposition Of A Subrank Time Reversal Operator -- Sounds Of Undersea Gas Leaks -- Multi-auv Localization For An Underwater Acoustic Sensor Network. Edited By Lisheng Zhou, Wen Xu, Qianliu Cheng, Hangfang Zhao. Front Matter....Pages i-x Inference of Sound Attenuation in Marine Sediments from Modal Dispersion in Shallow Water....Pages 1-9 Counterintuitive Results in Underwater Acoustic Communications....Pages 11-18 Comparisons of Methods for Numerical Internal Wave Simulation in Long-Range Acoustical Propagation....Pages 19-25 Acoustic Data Assimilation: Concepts and Examples....Pages 27-35 The Preliminary Results of a Single-Hydrophone Geoacoustic Inversion for Data Collected at the Sea of Japan....Pages 37-43 Measurements of Ultrasound Attenuation of Suspended Particles with Various Size Distributions....Pages 45-47 A Low Complexity Multichannel Adaptive Turbo Equalizer for a Large Delay Spread Sparse Underwater Acoustic Channel....Pages 49-55 A Turbo Equalization Based on a Sparse Doubly Spread Acoustic Channels Estimation....Pages 57-61 Design and Testing of Underwater Acoustic Communications for an AUV....Pages 63-70 Research of Axis Mismatches Between Pairs of Sensitive Elements of Underwater Acoustic Velocity Gradient Sensors....Pages 71-79 A Passive Fathometer Technique for Bottom Profiling Using Ambient Noise....Pages 81-83 Target Motion Parameter Estimation for LOFARgrams Based on Waveguide Invariants....Pages 85-92 Source Localization by Maximizing the Longitudinal Correlation Using Waveguide Invariant Theory....Pages 93-98 Selective Detection and Localization by Decomposition of a Subrank Time Reversal Operator....Pages 99-105 Sounds of Undersea Gas Leaks....Pages 107-116 Multi-AUV Localization for an Underwater Acoustic Sensor Network....Pages 117-127