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Marshall Earle, Ph.D., Principal Investigator Mike Brown, Lead Electrical Engineer

AN EASILY DEPLOYED AND RECOVERED GPS-TRACKED WATER LEVEL BUOY USM GPS Workshop - March 2004. NOAA SMALL BUSINESS INNOVATION RESEARCH (SBIR) PHASE II PROJECT. Marshall Earle, Ph.D., Principal Investigator Mike Brown, Lead Electrical Engineer Jeffrey Gallagher, Electrical Engineer

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Marshall Earle, Ph.D., Principal Investigator Mike Brown, Lead Electrical Engineer

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  1. AN EASILY DEPLOYED AND RECOVEREDGPS-TRACKED WATER LEVEL BUOY USM GPS Workshop - March 2004 NOAA SMALL BUSINESS INNOVATION RESEARCH (SBIR) PHASE II PROJECT Marshall Earle, Ph.D., Principal InvestigatorMike Brown, Lead Electrical Engineer Jeffrey Gallagher, Electrical Engineer (Bill Hughes, Lead Mechanical Engineer)

  2. GPS-TRACKED BUOY

  3. KEY SPECIFICATIONS • Weight in air with battery packs 110 kg • Diameter of hull 0.89 m • Height with radio antenna 1.37 m • Height w/o antenna 0.97 m • Nearly spherical hull with polycarbonate and anodized 6061T0 aluminum hemispheres, non-pinching gasket seal with stainless steel bolts, navigation light • Operating life 1 month • Operating Temperature Range -30oC to +60oC • Outputs: water level, significant wave height, average wave period, Data Quality Control (DQC) parameters • See the preliminary specification sheet for additional information.

  4. KEY COMPONENTS • Topcon Legacy E GPS • Topcon LegAnt GPS / GLONASS antennas • Microwave Data Systems narrow band CPFSK transceiver, operating at 410.0625 MHz (frequency band assigned to NOAA) • Onset Computer Tattletale Model 8 microprocessor • Texas Instruments MSP-430 microcontroller • MuRata ENV-05DB-52 angular rate sensors (3) • Crossbow Technology CXL02TG3 tri-axial accelerometer • Carmanah Technologies 701 solar powered navigation light

  5. BUOY IN SMALL PICKUP TRUCK BEFORE FIELD TEST

  6. DOME REMOVAL / REPLACING

  7. UPPER PLATE COMPONENTS

  8. LOWER PLATE AND ELECTRONICS UNIT

  9. ELECTRONICS UNIT INTERNAL VIEW

  10. ELECTRONICS UNIT LABELLED COMPONENTS

  11. BATTERY PACK REMOVAL / REPLACING

  12. BUOY EXPLODED VIEW

  13. BUOY CROSS SECTIONAL VIEW

  14. PLANNED BUOY MODIFICATIONS

  15. EXAMPLE BUOY MOORING

  16. EXAMPLE SCREEN SHOT OF BUOY USER INTERFACE Data steps are due to changing the buoy's water level in a test tank.

  17. ELECTRONIC AND DATA ANALYSIS DESIGN BUOY ELECTRONICS WATER LEVEL CALCULATION FLOWCHART SHORE STATION ELECTRONICS

  18. BASE STATION SETUP ON WAVELAND BEACH

  19. CHECKING THE BUOY ON THE BEACH VIA ITS INFRA-RED PORT

  20. REFERENCING TO BENCHMARK PANAMA CITY BEACH, FL, 1 Shore base station installed at benchmark.

  21. REFERENCING TO BENCHMARK PANAMA CITY BEACH, FL, 2 Shore base station antenna installed in final position.

  22. PANAMA CITY BEACH, FL, DATA COMPARISON Error detection routine later added to remove infrequent spikes.

  23. SMALL NOAA HYDROGRAPHIC VESSEL USED FOR CHESAPEAKE BAY, MD, DEPLOYMENT

  24. BUOY DEPLOYMENT CHESAPEAKE BAY, MD

  25. DEPLOYED BUOY CHESAPEAKE BAY, MD

  26. CHESAPEAKE BAY, MD, DATA COMPARISON Infra-red port lockup caused some data loss (corrected in operational design).

  27. WATER LEVEL DATA COMPARISONS • Panama City Beach, FL • RMS difference (including mean difference) 3.76 cm • RMS difference (mean removed) 1.96 cm • Chesapeake Bay, MD • Mean difference determined and removed at start of data collection. • RMS difference 1.45 cm

  28. WAVES (NOT MAIN RESEARCH GOAL) Average Wave Period SignificantWave Height • Wave height accuracy +/- 0.2 m (could reach +/- 0.1 m) • Wave period accuracy +/- 1.0 s (could reach +/- 0.5 s)

  29. SUMMARY A GPS-tracked water level buoy that can be easily deployed and recovered from small or large vessels has been successfully designed, built, and field tested. The buoy is ready for transition to operational use to support hydrographic surveys and other applications.

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