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Harbor Acoustic Monitoring Systems

Explore the innovative portable acoustic monitoring system developed by John Allen at the University of Hawaii to track threats in harbor environments. This system utilizes advanced array technology for robust and cost-effective research approaches.

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Harbor Acoustic Monitoring Systems

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  1. Harbor Acoustic Monitoring Systems • John Allen • University of Hawaii • Department of Mechanical Engineering • Honolulu, HI 96822 • January 10, 2011

  2. Harbor Environment • Threats - Swimmers, Divers, AUVs, Small Vessels • System - Robust, Cost Effective,Portable

  3. Research Approach Problem: A wide variety of unknown, quiet targets in different cluttered, shallow water environments Approach: Acoustic Array – Provides Beam-Forming Capabilities, Detection and Tracking (Passive, Active Acoustics) Snapping Shrimp

  4. Deployment: Kilo-Nalu Ocean Observatory Site – 12 meter Portable Arrays -24 Channels,300 Hz-50 KHz bandwidth, 24 bit acquisition, Autonomous, 120 lbs

  5. Deployment Small Surface Vessel, Three Divers (Portability) Leveraged Experiment – Vector Sensor Array (UCSD/Scripps), 24 Element Array (Portland State), 24 Element (UH)

  6. Array Configuration • Horizontal Array – Bottom, Clutter Reduction • Vertical Array – Surface, Discrimination in Depth • Synchronized Data Collection cwater Receivers Target Water Sediment Sub-bottom

  7. Vertical Array

  8. Horizontal Array Horizontal Array

  9. Vertical -Modeled Data Vertical -Measured Data Direct path Surface echo Bottom echo Source Late arriving echoes are broken up in data likely due to scattering VLA Vertical Array: Performing Properly

  10. Modeled Data Horizontal- Measured Data Direct path +bottom echo Surface + Surfacebottom echoes Time delay across array: robust measure of the source direction Source HLA Horizontal Array: Performing Properly

  11. Acoustic Array Processing Conventional Beamforming (Horizontal Array) Extensions: Adaptive and Near Field Beamforming Combined Horizontal and Vertical Arrays

  12. REMUS

  13. REMUS

  14. Small boat engine Engine cuts out Zoomed X-axis

  15. REMUStone

  16. Wide-band Beamforming boat REMUS

  17. Narrow-band Beamforming

  18. SCUBA Divers Channel 10 of Array

  19. Channel 10 of Array Same spectrogram +14 dB white noise

  20. Vector Sensor Array Breaking Wave Noise, Bubble Entrainment

  21. Aquatic Research Lab – Research and Educational

  22. Underwater Swimming

  23. DHS Educational Activities • Two High School Interns – Summer 2010 • Three Undergraduate Students – 2010-11 (Two Native Hawaiian) • Graduate Student -MSME (Tyler Hee-Wai, ~Spring 2012) Undergraduate Acoustic Laboratory – DHS Topic -Acoustic Characterization of RC Submarines and Boats ME 474 – Fundamentals of Acoustics (Spring 2011) Acoustical Society of America – Spring 2011 Meeting, Seattle, WA

  24. Conclusions and On-Going Research • Deployment: Arrays (“L”,Vertical-Horizontal), Vector Sensor • Acoustic Beamforming (Conventional)– REMUS, Divers, Ships (Passive Detection and Tracking) • Combined Vertical and Horizontal Arrays • Adaptive and Near Field Beamforming • Acoustic Sources, Integration with IR Surface Detection Acknowledgements: CIMES/DHS Martin Siderius (Portland State University), Grant Deane, James Uyloan (UCSD/Scripps) Joint Array Field Deployment Jan Prins (UH Aquatic Research Lab) Kilo Nalu Observatory, University of Hawaii-Manoa IR Surface Diver Detection

  25. Additional Slides

  26. Future Directions Two Array Signal Processing Acoustic Recorders – Linked Modems (Post-Doc – Alec Duncan) Collaborative DHS International Proposal Australia -2011

  27. ~25 kHz Acoustic Comms Design Freq of array(300-1500 Hz)

  28. Acoustic Array Processing

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