Efficient approach to computing travel time with the parabolic equation model

Area of Science:

• Ocean acoustics
• Wave propagation modeling
• Computational physics

Background:

• Accurate acoustic travel time computation is crucial for underwater acoustics.
• Existing methods may be computationally intensive or less accurate in complex environments.
• The parabolic equation model is a standard tool for acoustic propagation.

Purpose of the Study:

• To present an efficient and accurate method for computing acoustic travel time.
• To leverage the parabolic equation model for improved travel time calculations.
• To validate the new method against established techniques.

Main Methods:

• Utilizing the frequency derivative of the acoustic phase to determine differential travel time.
• Computing acoustic travel time by analyzing the phase difference across closely spaced frequencies.
• Requiring field computation at only two frequencies, reducing computational load.

Main Results:

• The proposed method efficiently computes acoustic travel time.
• The technique demonstrated good agreement with other established travel time methods.
• Successful application across diverse acoustic environments including deep water, shallow water, and 3D propagation.

Conclusions:

• The presented method offers an efficient alternative for acoustic travel time computation.
• This approach simplifies the computational requirements compared to full-band methods.
• The method's robustness is confirmed across various underwater acoustic scenarios.