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Writing Bragg Gratings in Multicore Fibers
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Passive underwater acoustic markers using Bragg backscattering.

Prakhar Srivastava1, Brendan Nichols1, Karim G Sabra1

  • 1School of Mechanical Engineering, Georgia Institute of Technology, 771 Ferst Drive NW, Atlanta, Georgia 30332-0405, USA prakhar.hyd@gmail.com, bnichols8@gatech.edu, karim.sabra@me.gatech.edu.

The Journal of the Acoustical Society of America
|January 1, 2018
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Summary
This summary is machine-generated.

This study shows passive underwater acoustic markers, called AcoustiCodes, can enable 3D navigation for sonar systems. These markers offer a unique acoustic signature for long-range, passive underwater positioning.

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Area of Science:

  • Acoustics
  • Ocean Engineering
  • Robotics

Background:

  • Underwater navigation relies on active systems, limiting range and power.
  • Passive systems offer advantages in stealth and energy efficiency.
  • Existing sonar systems require enhanced navigation capabilities.

Purpose of the Study:

  • To demonstrate the feasibility of a passive underwater acoustic marker technology (AcoustiCode) for navigation.
  • To enable 3D navigation and information signaling using existing sonar systems.
  • To provide a long-range, passive alternative to optical navigation.

Main Methods:

  • Utilizing planar surfaces with machined periodic patterns to create AcoustiCodes.
  • Engineering spatial and frequency variations in the patterns for unique acoustic signatures.
  • Leveraging Bragg backscattering principles to generate distinct beampatterns.

Main Results:

  • AcoustiCodes produce unique 3D acoustic signatures over selected frequency bands.
  • The technology enables passive 3D navigation and information signaling.
  • Potential for significantly longer ranges compared to optical systems.

Conclusions:

  • AcoustiCode technology is feasible for passive underwater navigation.
  • This passive acoustic marker system enhances existing sonar capabilities for AUVs.
  • Offers a promising solution for long-range, energy-efficient underwater positioning and communication.