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Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays for High-Throughput Large-Scale Sample Inspection

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Striation-based beamforming for active sonar with a horizontal line array.

Lisa M Zurk¹, Daniel Rouseff

¹Northwest Electromagnetics and Acoustics Research Laboratory, Department of Electrical Engineering, Portland State University, Portland, Oregon 97201-0751, USA. zurkl@pdx.edu

The Journal of the Acoustical Society of America

|October 9, 2012

Summary

This summary is machine-generated.

A new physics-based beamforming method enhances underwater active sonar systems by combining array signals at specific frequencies. This striation-based approach improves signal gain and tracker performance in complex marine environments.

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Area of Science:

Physics
Acoustics
Signal Processing

Background:

Underwater active sonar systems face challenges with signal processing due to multipath interference.
Traditional beamforming methods may not fully compensate for complex acoustic environments.

Purpose of the Study:

To develop a novel physics-based beamforming method for horizontal arrays in underwater active sonar.
To enhance signal gain and tracker performance by addressing multipath-induced fading.

Main Methods:

A striation-based beamformer is proposed, coherently combining pressure signals from array elements.
Frequencies are selected based on a striation hypothesis.
Linear frequency shift and phase terms are incorporated into array weights to counteract fading.

Main Results:

The method demonstrated increased signal gain in beam output.
Successful application shown using data from a North Atlantic towed array.
Improved tracker performance was discussed when combined with waveguide invariant concepts.

Conclusions:

The striation-based beamformer offers a robust solution for underwater active sonar.
The method effectively mitigates multipath fading and enhances signal processing.
Integration with waveguide invariant concepts shows promise for advanced sonar applications.