FPM-β: A method for waveguide invariant estimation using one-dimensional broadband acoustic intensity.

Area of Science:

• Ocean acoustics
• Waveguide theory
• Signal processing

Background:

• Ocean waveguides support a finite number of long-range propagating normal modes.
• Accurate estimation of waveguide invariants is crucial for underwater acoustic applications.
• Existing methods often require extensive environmental data or complex sensor arrays.

Purpose of the Study:

• To propose a novel method for estimating waveguide invariants in ocean environments.
• To develop a technique that utilizes readily available acoustic intensity data.
• To overcome limitations of existing methods by not requiring prior environmental parameters.

Main Methods:

• Acoustic intensity spectrum analysis from a single hydrophone.
• Application of the β-warping transform operator.
• Integration with singular value decomposition (SVD).

Main Results:

• Successfully estimated waveguide invariants using simulated and experimental data.
• Demonstrated the effectiveness of the combined β-warping transform and SVD approach.
• Validated the method's independence from prior marine environmental parameters.

Conclusions:

• The proposed method offers a robust and practical solution for waveguide invariant estimation.
• This technique simplifies underwater acoustic data processing by using single-point measurements.
• The findings have implications for acoustic propagation modeling and underwater navigation.