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DRDC Aspects of SW06 – 2007 Workshop

DRDC Aspects of SW06 – 2007 Workshop. Sean Pecknold, Paul Hines, John Osler, Victor Young, and Dale Ellis Maritime Environmental Awareness Group, DRDC Atlantic 31 January, 2007. Outline. Data acquired Propagation loss Swath bathymetry FFCPt WBS and WARBL Data needed

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DRDC Aspects of SW06 – 2007 Workshop

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  1. DRDC Aspects of SW06 – 2007 Workshop Sean Pecknold, Paul Hines, John Osler, Victor Young, and Dale Ellis Maritime Environmental Awareness Group, DRDC Atlantic 31 January, 2007

  2. Outline • Data acquired • Propagation loss • Swath bathymetry • FFCPt • WBS and WARBL • Data needed • Anticipated output/collaborative efforts • Other results

  3. Propagation loss • Sources • MSM • Shipboard projector • CWs, 200 Hz LFMs @ 1.2 and 3 kHz • Receivers • 2 GPS enabled SBs • Moored UAT – 8 h/p between 22 m and 51 m depth – 24kHz sampling rate

  4. Propagation loss runs

  5. Local measurements Reson 8125 • 455 kHz, 120 metre range • 240 cross-track beams (0.5º) • 1º along-track beam width • 6 mm depth resolution • DGPS, Gyro, pitch-roll-heave • Pole mount on Quest Next Figure 2000 m Hull mounted EdgeTech X-Star Chirp Profiler (2-16 kHz)

  6. Multiple drop FFCPT transectsseabed and water column measurements

  7. Initial scattering results from SW06 Strataform Scattering Strength Result Hines et al., (2005) SW06 Energy Time Series – in process of calibration

  8. Bottom loss is the angle-fitted source level, calculated from direct arrival, minus received level minus theoretical transmission loss from a perfectly reflecting bottom (technique of Holland and Osler, 2000). BL = SL - RL - TL   Wide Angle Reflection and Bottom Loss BOTTOM REFLECTED Time DIRECT SOURCE RECEIVER Range 1-12 kHz source

  9. Data needed • Sensor data from moorings (23 July – 2 August) • Shipboard met data, CTDs/XBTs (available on DVD) • Other acoustic data from 25 July – 2 August; ambient noise and propagation (available from WHOI) • MSM source levels • Sediment acoustic properties • Chirp runs along propagation paths/WBS area (Turgut) • Sediment mapping (Miller) • Roughness measurements (IMP) in APL-UW area (Tang) • Core data from FFCPt drop areas for comparison

  10. Anticipated output/collaborative efforts • Scattering strengths and roughness, with Tang • Analysis of WARBL data for bottom loss at varying angles and comparison w. Dahl • Comparison of FFCPt measurements to inversion results (Chapman and others) • Propagation sensitivity to oceanographic and geoacoustic parameters, with Dosso (UVic) • Improvement of model predictions based on REA – 2007 Maritime Acoustic Symposium (CFMWC/METOc)

  11. Other results • Successful REA operation with reachback to DRDC • Auralization data from BBN targets • In-air vs. in-water sound levels for Convair flyover • Ship noise levels

  12. The Defence Research and Development Branch provides Science andTechnology leadership in the advancement and maintenance of Canada’s defence capabilities.

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