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Motion parameter estimation of multitonal sources with a single hydrophone.

Jing Chi1, Dazhi Gao1, Xuegang Zhang2

  • 1Department of Marine Technology, Ocean University of China, Qingdao 266100, China.

JASA Express Letters
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel method to estimate underwater source motion using a single hydrophone and two tones. The technique determines the time of closest approach and range-to-speed ratio, crucial for acoustic source tracking.

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Area of Science:

  • Acoustics
  • Oceanography
  • Signal Processing

Background:

  • Estimating underwater acoustic source motion is vital for navigation and surveillance.
  • Traditional methods often require multiple sensors or detailed source information.
  • Single hydrophone methods are desirable for simplified deployment.

Purpose of the Study:

  • To develop a method for estimating source motion parameters using a single hydrophone.
  • To determine the time of closest point of approach (tCPA) and the ratio of range at closest approach to source speed (rCPA/v).
  • To achieve this using only the acquisition time of the pressure field.

Main Methods:

  • Correlation of two resampled tonal signals from a multitonal source.
  • Utilizing only two distinct tones emitted by the same source.
  • Incorporating the waveguide invariant value for calculations.

Main Results:

  • Successfully estimated source motion parameters (tCPA and rCPA/v) with a single hydrophone.
  • The method requires minimal information: two tones and the waveguide invariant.
  • Validation performed through both simulated data and the SWellEx-96 experimental data.

Conclusions:

  • The proposed method offers an effective way to estimate underwater acoustic source motion parameters.
  • It simplifies the requirements for acoustic tracking, needing only a single hydrophone and two tones.
  • This technique has practical implications for underwater acoustics and surveillance applications.