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Comparing phase-sensitive and phase-insensitive echolocation target images using a monaural audible sonar.

Roman Kuc1

  • 1Department of Electrical Engineering, Yale University, New Haven, Connecticut 06511, USA.

The Journal of the Acoustical Society of America
|May 3, 2018
PubMed
Summary
This summary is machine-generated.

This study compares two methods for creating target maps from sonar echoes. Phase-sensitive processing offers better resolution, while phase-insensitive processing can create misleading phantom targets.

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Area of Science:

  • Acoustics and Signal Processing
  • Biomedical Engineering
  • Robotics and Autonomous Systems

Background:

  • Monaural echolocation uses single-channel audio signals for environmental sensing.
  • Generating accurate target maps is crucial for navigation and object detection.
  • Understanding signal processing artifacts is key to reliable echolocation.

Purpose of the Study:

  • To compare phase-sensitive and phase-insensitive processing of monaural echolocation waveforms.
  • To evaluate the generation of target maps and identify processing artifacts.
  • To assess the impact of processing methods on target resolution and artifact formation.

Main Methods:

  • Processing of composite waveforms containing emissions and echoes from audible sonar.
  • Phase-sensitive processing to estimate the composite signal envelope.
  • Phase-insensitive processing using the power spectrum to obtain the autocorrelation function envelope.

Main Results:

  • Both processing methods generate target maps displaying key features.
  • Phase-sensitive processing demonstrates superior resolution compared to phase-insensitive methods.
  • Phase-insensitive processing generates near-range phantom-reflector artifacts from multiple echoes.
  • Artifacts can interfere with true target detection, especially with short target durations.

Conclusions:

  • Phase-sensitive processing provides enhanced resolution for target mapping in echolocation.
  • Phase-insensitive processing introduces artifacts that can compromise accuracy.
  • Artifacts related to echo interference and multiple reflections are processing-independent.