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Table of contents
1 Introduction and State of the Art
1.1 General objective
1.2 Wave propagation through random media
1.2.1 Transverse review
1.2.2 Wave propagation in a random ocean
1.2.2.1 Sources of fluctuation
1.2.2.2 Effects on wave propagation
1.3 Emulators of WPRM
1.3.1 Motivations
1.3.2 Existing protocols
1.4 Corrective Signal Processing
1.5 Thesis Content
2 Dimensional Analysis
2.1 Introduction
2.2 Characteristic parameters in the “natural” oceanic case
2.2.1 Flatt´e’s dimensional analysis
2.2.2 Acoustic field correlation length
2.3 Sound field calculation in the lens case
2.3.1 The Small Slope Approximation in the case of two semi-infinite media
2.3.2 Application to the lens case
2.4 Sound field statistics
2.4.1 First-order statistics
2.4.2 Second-order statistics
2.5 The Fresnel radius and the diffraction parameter
2.6 Summary and conclusion
3 Development of a Scaled Experiment
3.1 Introduction
3.2 Experimental protocol
3.3 RAndom Faced Acoustic Lens manufacturing
3.4 Laboratory equipment
3.5 Numerical tools
3.5.1 Simulation tools in the scaled experiment configuration
3.5.2 Simulation tool in the corresponding oceanic configuration
3.6 Conclusion
4 Experimental results
4.1 Investigated configurations
4.2 Complex Pressure Distribution
4.2.1 Unsaturated regime
4.2.2 Partially saturated regime
4.2.3 Fully saturated regime
4.2.4 Discussion
4.3 Second-order moment analysis
4.3.1 Unsaturated regime
4.3.2 Partially saturated regime
4.3.3 Fully saturated regime
4.3.4 Discussion
4.4 Fourth-order moment analysis: intensity fluctuations
4.4.1 Unsaturated regime
4.4.2 Partially saturated regime
4.4.3 Fully saturated regime
4.5 Conclusion
5 Influence of Medium Fluctuations on Detection Performance
5.1 Introduction
5.2 Array gain degradation
5.3 Performance of classical techniques
5.3.1 Matched-Field Beamforming
5.3.2 High-resolution MUSIC algorithm
5.4 Corrective signal processing techniques
5.5 Discussion
6 At-sea Measurements: the ALMA Experiment
6.1 Introduction
6.2 Experimental configuration
6.2.1 Source sub-system
6.2.2 Receiver sub-system
6.3 First data gathering
6.4 A glimpse of the experimental results
6.5 Conclusion
7 Conclusion and FutureWork
7.1 Concluding remarks
7.2 Future work
