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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
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A method to address beam cross coupling errors in phased array Doppler sonar.

Kuankuan Jia1, Hui Tong1, Feng Hong1

  • 1Shanghai Acoustics Laboratory, Chinese Academy of Sciences, Shanghai, 201815, China.

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|May 4, 2023
PubMed
Summary
This summary is machine-generated.

Beam cross coupling errors degrade Doppler sonar velocity estimates. A new model and phase assignment method effectively reduce this bias, improving sonar performance in various conditions.

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Area of Science:

  • Acoustics and Signal Processing
  • Ocean Engineering

Background:

  • Doppler sonar systems are crucial for underwater velocity estimation.
  • Performance degradation due to beam cross coupling introduces precision loss and bias in velocity estimates.
  • Understanding the physical origins of beam cross coupling is essential for mitigation.

Purpose of the Study:

  • To develop a model explaining the physical essence of beam cross coupling in Doppler sonar.
  • To analyze the influence of environmental conditions and vehicle attitude on beam cross coupling bias.
  • To propose a novel phase assignment method for reducing beam cross coupling bias.

Main Methods:

  • A physical model was developed to represent beam cross coupling.
  • The model was used to analyze the impact of environmental factors and vehicle attitude.
  • A phase assignment technique was designed based on the developed model.

Main Results:

  • The proposed model successfully elucidates the physical mechanisms of beam cross coupling.
  • The model accurately predicts the effects of environmental conditions and vehicle attitude on coupling bias.
  • The phase assignment method demonstrated significant reduction in beam cross coupling bias across various tested settings.

Conclusions:

  • Beam cross coupling is a significant factor affecting Doppler sonar accuracy.
  • The developed model provides valuable insights into the sources of this error.
  • The proposed phase assignment method offers an effective solution for mitigating beam cross coupling bias and enhancing sonar velocity estimation.