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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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Synthetic adaptive matched field processing for moving source with a horizontal line array.

Fenghua Li¹, Feilong Zhu¹, Yanjun Zhang¹

¹State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.

The Journal of the Acoustical Society of America

|February 28, 2021

Summary

This summary is machine-generated.

This study introduces a new method to improve adaptive matched field processing (AMFP) for detecting moving targets in shallow waters. The technique effectively mitigates source motion, enhancing target detection ranges.

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Area of Science:

Underwater acoustics
Signal processing
Oceanography

Background:

Adaptive matched field processing (AMFP) is challenged by source motion in shallow water environments.
A large number of samples is needed for AMFP to minimize covariance matrix variance, but this blurs sound interference for moving targets.

Purpose of the Study:

To present a novel source motion mitigation technique for broadband moving targets in shallow water acoustics.
To enhance the performance of adaptive matched field processing (AMFP) in the presence of target movement.

Main Methods:

The proposed technique applies waveguide invariant theory to reformulate the covariance matrix.
Frequency and phase shifting are used, guided by a single scalar parameter hypothesis.
A moving target is effectively rendered stationary when the hypothesis parameter matches the true value.

Main Results:

The source motion mitigation technique was applied to experimental data from a bottom-mounted horizontal line array.
The method demonstrated a significant increase in target detection ranges.
Improved ability of AMFP to produce a sharp main peak for moving targets.

Conclusions:

The developed technique effectively mitigates source motion challenges in shallow water AMFP.
This advancement improves the detection capabilities for moving underwater targets.
The findings suggest practical improvements for sonar systems operating in dynamic environments.