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FAU Center for Acoustics and Vibrations Acoustic Communication and Navigation Systems

Pierre-Philippe Beaujean, Ph.D. pbeaujea@seatech.fau.edu Office of Naval Research PMS-EOD EdgeTech Inc. Center for Coastline Security and Technology (CCST). FAU Center for Acoustics and Vibrations Acoustic Communication and Navigation Systems. Acoustic Communication and Navigation Systems.

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FAU Center for Acoustics and Vibrations Acoustic Communication and Navigation Systems

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  1. Pierre-Philippe Beaujean, Ph.D. pbeaujea@seatech.fau.edu Office of Naval Research PMS-EOD EdgeTech Inc. Center for Coastline Security and Technology (CCST) FAU Center for Acoustics and VibrationsAcoustic Communication and Navigation Systems

  2. Acoustic Communication and Navigation Systems • Activities: • High-speed acoustic communications (ONR, PMS-EOD, CCST, EdgeTech) • Acoustic positioning (ONR) • Acoustic piloting (CCST) • Command-and-Control (ONR , EdgeTech) • Voice communications (ONR, EdgeTech)

  3. High-speed acoustic communications • The objective is to develop new means of achieving very high-speed acoustic communication (100,000+ bits per second) at fairly close range (300 meters max) in harbors and in very shallow water. • Such an objective can be reached in the form of a small, low-power and inexpensive device, well suited for modern untethered underwater vehicles operating in very shallow water and ports. • Compressed video or high-resolution sonar images (Didson and such) are relayed to a topside unit in real-time. • Acoustic communications were made possible at a coded rate up to 100,000 bps at 50 m at reduced source speed (1.5+ mps). • The HS-HFAM is remarkably power efficient and ideal for small UUVs and divers: at 50m, output power 0.63 W, 130,692 bits/J at 150,000 coded bps.

  4. General Concept

  5. CETUS-II Mock-up Unit

  6. ONR STTR Phase II with EdgeTech • The phase II base award objective is to develop a prototype Very High Bit Rate Broadband Acoustic Modem, capable of achieving true data rates of up to 100 kbps at a maximum range of 300 meters, for a maximum rate-range of 30 kbps-km. • The frequency band of operation is 240 kHz to 360 kHz approximately. This prototype modem consists of two components: a topside acoustic modem and an underwater acoustic modem.

  7. Marina Test Source Source 50m 25m Receiver Source 40m • Dec. 2005 and Jan. 2006 • 2 hour missions • 120 transmissions each • 25 to 50 m range • Top speed 0.75 m/s

  8. Channel Characteristics

  9. Turning Basin Tests (January 2006) 25m 50m 75m 10m 10m 10m 10m Receiver Source • 2 hours, 120 transmissions • 25-75 meters with 10 meter relative movement • Top speed 1.5 m/s • Uniform depth 14 m

  10. Image Transmission at 50 musing “pgm” image format 100,000 coded bps and BER 0.024% 100,000 coded bps and BER 0.098% < 0.4 sec 4KBytes 150,000 coded bps and BER 0.854% 150,000 coded bps and BER 1.843%

  11. Rapidly Deployable Navigation and Communication GATEWAY Buoyin collaboration wit Dr. F. Driscoll (FAU)and Dr. W. Venezia (NSWC-CD) Concept: To provide UUVs with a “fire and forget” A-sized rapidly deployable, low observable, low cost navigation and communication GATEWAY buoy Deployment Sequence: • Activate mooring system and acoustic payload (system goes into sleep mode) • Deploy • Mooring system, buoy and telemetry system activate and deploy either • once in water, • after a timed delay, or • with encoded acoustic signal. • System anchors and is operational

  12. Rapidly Deployable Navigation and Communication GATEWAY Buoy System Specs: Dim: “A-sized” 4.75” diam x 37.9” long Weight: 29 lbs (excluding launch tube) Reserve Buoyancy: 25 lbs Performance: • Currents: 0 – 2.5 m/s (0 – 5 knots) • Depths 2 – 200 m (6 – 650 ft) • Max Sea State 5 • 3 month operation • LBL: up to 2 km ~1m accuracy • Acoustic Comms: 2 km @ 80 bps • USBL optional • Delayed and Remote Activation • Iridium Communications

  13. Deployment Methods The system is designed to be versatile and robust, capable of being launched from conventional charge activated A-Sized launch tubes, gravity launch, by hand, and underwater. High Speed Vessel Helicopter Fixed Wing Aircraft Underwater

  14. System Overview Streamlined Surface Buoy A combination payload with anacoustic communications, LBL and USBL positioning, and GPS/RF/Iridium Acoustic Activation System Intelligent Mooring Spool Acoustic Telemetry System Combined Parachute and Anchor

  15. Overall Acoustic System

  16. Deployment Results AUV Fest 2005 • 2 Buoys Successfully Deployed from moving vessel, 1st at 15 knots, 2nd at 20 knots • 2 Buoys Successfully Deployed in Acoustic Ops Area and operated for 2 days without intervention

  17. High Speed Vessel Drop Results AUV Fest 2005

  18. To date, 15 units have been built

  19. Questions?

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