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Persistent Surveillance

Persistent Surveillance. John S. Allen University of Hawaii- Manoa Honolulu, HI 96822. Illegal Fishing and Drug Traffic Small Boat Localization Underwater – AUV and Divers Boat Classification Active Mitigation . Boat Localization . Downtown Honolulu. Honolulu Harbor. Oahu, Hawai’i, USA

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Persistent Surveillance

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  1. Persistent Surveillance John S. Allen University of Hawaii-Manoa Honolulu, HI 96822

  2. Illegal Fishing and Drug Traffic • Small Boat Localization • Underwater – AUV and Divers • Boat Classification • Active Mitigation

  3. Boat Localization Downtown Honolulu Honolulu Harbor • Oahu, Hawai’i, USA • Kilo NaluNearshore Reef Observatory • Undersea cable 0.4 km from shore • 12-m water • Harbors: • Honolulu Harbor (commercial) • Kewalo Basin Harbor (commercial, recreational) Waikiki Kewalo Basin Harbor Deployment Site

  4. Small boat Single small outboard motor Handheld GPS recorded location GPS manually synchronized against array clock ~ 1 sec accuracy Broadband noise source

  5. CTR (Correlation-Time-Record) “Ghost lines” got us thinking… Multipath correlation invariant? What happens for far away target? direct-direct corr. direct-image corr. image-direct corr. • Boat going in circles around the deployment site: target far away

  6. Boat Localization Possible target location Possible target location • Can we get range & break left/right ambiguity using single pair? • Multipath • Current methodology: • Multiple pairs of sensors • Hyperbola from each pair, look for intersection • Cannot deploy on mobile platform

  7. Multipath – Image Theory • Correlation lag times depend on: • bathymetry • target bearing • target range bottom-surface image surface propeller seabed receiver If we know depth of bottom reflection, we can predict correlation lag of each peak. So, can we invert for the range/bearing?

  8. Ambient Noise-Time Average Spectra

  9. Collaborative Project : NUWC Keyport Prevent Combat Swimmer Entry into Area of Treatment Pier May-June 2013 – Passive Acoustics (Coda Octopus), September 2013- Sonar, Navy Seals

  10. Project Justification: The Joint Base Pearl Harbor-Hickam (JBPHH) Deperm facility commenced operations in FY 2012. A reliable undersea threat detection capability is required in order to provide increased level of protection for high-value Naval assets during deperming operations. Specific Goal for current FY: Presently, most challenging threat to detect and track is combat swimmer utilizing Closed-Circuit Rebreather (CCR). NUWC Code 244 will partner with University of Hawaii UARC (Dr. Allen) to collect acoustic signals emitted by divers with CCRs. Diving near the Deperm Facility, divers will make lateral passes on the hydrophone array (provided by UH/Dr. Allen) and single broad-band hydrophone (provided by NUWC NPT Sound Lab) at various ranges. Range selections vary from “loudly audible” to “definitely not audible”. Goals are to continue development in following FY with proof of concept. This year’s activities should collect the data necessary to determine the way-ahead. Sponsors: NUWC Keyport and JBPHH Customers: COMSUBPAC N99 and PMS 480

  11. Boat Classification – RPDE (Nonstationary)

  12. CFD Software –Adaptive Research, Inc.

  13. Recent studies indicate more intricate echolocation processes Acoustic array allows to understand 3D composition of echolocation signals Ability to work with a false killer whale (Pseudorcacrassidens)

  14. Conclusions

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

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