Range-dependent geoacoustic inversion using equivalent environmental model in the presence of doppler effect

Area of Science:

• Oceanography
• Acoustics
• Geophysics

Background:

• Geoacoustic inversion using moving sensors is cost-effective but faces challenges in range-dependent environments.
• Established methods like matched-field inversion (MFI) struggle with environmental mismatch and numerous unknown parameters.

Purpose of the Study:

• To develop an efficient geoacoustic inversion technique for range-dependent environments using moving sensors.
• To address the complexities introduced by the Doppler effect in acoustic data.

Main Methods:

• Derivation of an equivalent range-independent environmental model from a range-dependent one.
• Modification of received acoustic fields using Doppler-shifted wavenumbers.
• Application of the method to synthetic aperture data generated by moving sensors.

Main Results:

• The proposed method effectively simplifies range-dependent environments into a manageable model.
• Doppler effects are accounted for, improving inversion accuracy.
• Validation using SWellEx-96 experimental data confirms the method's effectiveness.

Conclusions:

• The developed geoacoustic inversion technique offers an efficient solution for range-dependent underwater environments.
• The method successfully integrates moving sensor data and accounts for Doppler shifts.
• This approach enhances the feasibility of low-cost, high-deployment geoacoustic surveys.