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Beam-time delay domain deconvolved scheme for high-resolution active localization of underwater targets
Jingning Jiang1, T C Yang1, Xiang Pan1
1College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China.
The Journal of the Acoustical Society of America
|December 31, 2020
Summary
This study introduces a novel deconvolution method for active sonar, significantly enhancing both temporal and angular resolution. The technique improves target detection by suppressing reverberations in sonar systems.
Area of Science:
- Oceanography
- Acoustics
- Signal Processing
Background:
- Conventional beamforming (CBF) and matched filter (MF) are standard active sonar techniques.
- MF performance is limited by signal bandwidth (temporal resolution), while CBF is limited by array aperture (angular resolution).
- Prior research demonstrated angular resolution enhancement via CBF output deconvolution.
Purpose of the Study:
- To extend deconvolution to the time domain for MF outputs.
- To develop a high-resolution, two-dimensional deconvolution method.
- To simultaneously improve temporal and angular resolution in active sonar.
Main Methods:
- Deconvolution of matched filter (MF) outputs in the time domain.
- Application of a novel two-dimensional deconvolution technique.
- Validation using numerical simulations and experimental tank data.
Main Results:
- Achieved a 26-fold improvement in angular resolution compared to conventional methods.
- Achieved a 10-fold improvement in temporal resolution compared to conventional methods.
- Significantly suppressed reverberations, enabling clearer detection of target echoes.
Conclusions:
- The proposed 2D deconvolution method effectively enhances both temporal and angular resolution in active sonar.
- This technique offers superior performance over traditional MF and CBF methods.
- The method facilitates improved target detection in complex acoustic environments.
