Underwater Acoustics: Analysis, Design and Performance of Sonar / Edition 1

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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.

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Product Details

  • ISBN-13: 9780470688755
  • Publisher: Wiley
  • Publication date: 8/16/2010
  • Edition number: 1
  • Pages: 372
  • Product dimensions: 6.80 (w) x 9.80 (h) x 1.00 (d)

Meet the Author

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.

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Table of Contents

About the Author.



1 Introduction to Sonar.

1.1 Acoustic Waves.

1.2 Speed of Propagation.

1.3 Acoustic Wave Parameters.

1.4 Doppler Shift.

1.5 Intensity, SPL, and Decibels.

1.6 Combining Acoustic Waves.

1.7 Comparative Parameter for Sound in Water and Air.


2 The Sonar Equations.

2.1 Signal-to-Noise Ratio.

2.2 Active Sonar Equation.

2.3 Signal Excess.

2.4 Figure of Merit.


3 Transducers, Directionality, and Arrays.

3.1 Transducer Response.

3.2 Beam Pattern Response.

3.3 Linear Arrays.

3.4 Rectangular Planar Array.

3.5 Amplitude Shading.

3.6 Continuous Arrays.

3.7 Volumetric Arrays.

3.8 Product Theorem.

3.9 Broadband Beam Patterns.

3.10 Directivity and Array Gain.

3.11 Noise Cross-Correlation between Hydrophones.

3.12 Directivity of Line Arrays.

3.13 Directivity of Area Arrays.

3.14 Directivity of Volumetric Arrays.

3.15 Difference Arrays.

3.16 Multiplicative Arrays.

3.17 Sparsely Populated Arrays.

3.18 Adaptive Beamforming.


4 Active Sonar Sources.

4.1 Source Level.

4.2 Cavitation.

4.3 Near-Field Interactions.

4.4 Explosive Sources.

4.5 Physics of Shock Waves in Water.

4.6 Bubble Pulses.

4.7 Pros and Cons of Explosive Charges.

4.8 Parametric Acoustic Sources.


5 Transmission Loss.

5.1 Sound Speed Profile in the Sea.

5.2 Street's Law and Transmission across an Interface.

5.3 Reflection and Transmission Coefficients.

5.4 Transmission through a Plate.

5.5 Ray Tracing.

5.6 Spreading Loss.

5.7 Absorption of Sound in the Ocean.


6 Transmission Loss: Interaction with Boundaries.

6.1 Sea State, Wind Speed, and Wave Height.

6.2 Pili┼żota Model for Fully Developed Seas.

6.3 Sea Surface Interaction.

6.4 Bottom Loss.

6.5 Leakage Out of a Duct, Low-Frequency Cutoff.

6.6 Propagation Loss Model Descriptions.


7 Ambient Noise.

7.1 Ambient Noise Models.

7.2 Seismic Noise.

7.3 Ocean Turbulence.

7.4 Shipping Noise.

7.5 Wave Noise.

7.6 Thermal Noise.

7.7 Rain Noise.

7.8 Temporal Variability of Ambient Noise.

7.9 Depth Effects on Noise.

7.10 Directionality of Noise.

7.11 Under Ice Noise.

7.12 Spatial Coherence of Ambient Noise.


8 Reverberation.

8.1 Scattering, Backscattering Strength, and Target Strength.

8.2 Reverberation Frequency Spread and Doppler Gain Potential.

8.3 Important Observation with Respect to Reverberation.


9 Active Target Strength.

9.1 Target Strength Definition.

9.2 Active Target Strength of a Large Sphere.

9.3 Active Target Strength of a Very Small Sphere.

9.4 Target Strengths of Simple Geometric Forms.

9.5 Target Strength of Submarines.

9.6 The TAP Model.

9.7 Target Strength of Surface Ships.

9.8 Target Strength of Mines and Torpedoes.

9.9 Target Strength of Fish.


10 Radiated Noise.

10.1 General Characteristics of Ship Radiated Noise.

10.2 Propeller Radiated Noise.

10.3 Machinery Noise.

10.4 Resonance Noise.

10.5 Hydrodynamic Noise.

10.6 Platform Quieting.

10.7 Total Radiated Noise.


11 Self Noise.

11.1 Flow Noise.

11.2 Turbulent Noise Coherence.

11.3 Strumming Noise.


12 Statistical Detection Theory.

12.1 Introduction.

12.2 Case 1: Signal Is Known Exactly.

12.3 Case 2: Signal Is White Gaussian Noise.


13 Methodology for Calculation of the Recognition Differential.

13.1 Continuous Broadband Signals (PBB).

13.2 Continuous Narrowband Signals (PNB).

13.3 Active Sonar.

13.4 Aural Detection.

13.5 Display Nomenclature.


14 False Alarms, False Contacts, and False Targets.

14.1 Sea Story.

14.2 Failure to Detect.

14.3 Detection Theory.

14.4 False Alarm Probability Calculation.

14.5 False/Nonthreat Contacts.

14.6 False Targets.

14.7 Summary and Conclusions.


15 Variability and Uncertainty.

15.1 Random Variability of a Sonar.

15.2 Sources of Variability.


16 Modeling Detection and Tactical Decision Aids.

16.1 Figure of Merit Range or R50 %.

16.2 Tactical Decision Aids.


17 Cumulative Probability of Detection.

17.1 Why is CPD Important?

17.2 Discrete Glimpse and Continuous Looking.

17.3 Leader's Jump Model.

17.4 Nonjump Processes.

17.5 What Are Appropriate Random Parameters?

17.6 Approximation Method for Computation of the Cumulative Probability of Detection (CPD).


18 Tracking, Target Motion Analysis, and Localization.

18.1 Bearing Trackers.

18.2 General Principle of Tracking and Bearing Measurement.

18.3 Other Sources of Bearing Error for Area Arrays.

18.4 Additional Sources of Errors for Line Arrays.

18.5 Bottom Bounce.

18.6 Manual versus Automatic Tracking.

18.7 Localization and Target Motion Analysis.

18.8 Bearings Only Methodologies.

18.9 Four-Bearing TMA.

18.10 Ekelund Ranging.

18.11 Range and Bearing TMA.

18.12 Other Bearings Only TMA Methodologies.

18.13 Other TMA and Localization Schemes.


19 Design and Evaluation of Sonars.

19.1 Choice of Frequency and Size.

19.2 Computational Requirements.

19.3 Signal Processing after Beamformer.

19.4 Active Pulse Choice.

19.5 Monostatic, Bistatic, and Multistatic Active Sonars.

19.6 Ambiguity Functions.

19.7 Mine Hunting and Bottom Survey Sonars.

19.8 Echo Sounding and Fishing Sonars.

19.9 Navigation.

19.10 Vehicle Location and At-Sea Rescue.

19.11 Intercept Receivers.

19.12 Communications.

19.13 Marine Mammals and Active Sonar.


A Fourier Transforms.

A.1 Definitions.

A.2 Perkins sees Theorem and Plancherel's Theorem.

A.3 Properties of Fourier Transforms.

A.4 Localization or Uncertainty Property.

B Analysis of Errors Associated with a Least Squares Methodology.



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