Application and Extension of Vertical Intensity Lower-Mode in Methods for Target Depth-Resolution with a...

Area of Science:

• Underwater acoustics
• Signal processing
• Target detection

Background:

• Traditional target depth resolution methods using vertical intensity are limited to targets exciting fewer than three normal modes.
• Accurate depth resolution is crucial for distinguishing aerial, surface, and underwater targets in shallow water environments.

Purpose of the Study:

• To improve the method for target depth resolution in shallow water by enhancing the analysis of vertical intensity.
• To expand the working band for target depth resolution beyond the limitations of previous methods.
• To achieve three-dimensional target depth resolution for better target classification.

Main Methods:

• The improved method utilizes the reactive component of vertical intensity.
• Targets are classified based on the lower-mode correlation quantity of vertical intensity.
• The approach is validated using simulation and experimental data.

Main Results:

• The enhanced method successfully resolves the depth of targets whose frequencies excite the first three normal modes.
• This expansion allows for accurate depth identification across a wider frequency range.
• Three-dimensional target depth resolution is achieved, enabling differentiation between aerial, surface, and underwater targets.

Conclusions:

• The improved method offers a significant advancement in target depth resolution for shallow water acoustics.
• The technique effectively broadens the applicability of vertical intensity analysis for underwater target detection.
• The validated algorithm provides a robust solution for distinguishing targets in three dimensions.