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usm_gps_workshop_nsi_gps_buoy_ rev2

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					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

     (Bill Hughes, Lead Mechanical Engineer)
GPS-TRACKED BUOY
         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.
              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
BUOY IN SMALL PICKUP TRUCK
    BEFORE FIELD TEST
DOME REMOVAL / REPLACING
UPPER PLATE COMPONENTS
LOWER PLATE AND ELECTRONICS UNIT
ELECTRONICS UNIT INTERNAL VIEW
ELECTRONICS UNIT LABELLED COMPONENTS
BATTERY PACK REMOVAL / REPLACING
BUOY EXPLODED VIEW
BUOY CROSS SECTIONAL VIEW
PLANNED BUOY MODIFICATIONS
EXAMPLE BUOY MOORING
        EXAMPLE SCREEN SHOT OF BUOY
              USER INTERFACE




Data steps are due to changing the buoy's water level in a test tank.
 ELECTRONIC AND DATA ANALYSIS DESIGN

    BUOY ELECTRONICS

                            WATER LEVEL CALCULATION
                                  FLOWCHART




SHORE STATION ELECTRONICS
BASE STATION SETUP ON
  WAVELAND BEACH
CHECKING THE BUOY ON THE BEACH
    VIA ITS INFRA-RED PORT
REFERENCING TO BENCHMARK
  PANAMA CITY BEACH, FL, 1




 Shore base station installed at benchmark.
REFERENCING TO BENCHMARK
  PANAMA CITY BEACH, FL, 2




                  Shore base station
                  antenna installed in
                  final position.
PANAMA CITY BEACH, FL, DATA COMPARISON


                                        6 minute Tidal Measurements w/r to MLLW (ft)
                                                                                                          NSI Base Station
  3.50
                                                                                                          NOAA Tide Station
  3.00
  2.50
  2.00
  1.50
  1.00
  0.50
  0.00




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Error detection routine later added to remove infrequent spikes.
    SMALL NOAA HYDROGRAPHIC VESSEL
USED FOR CHESAPEAKE BAY, MD, DEPLOYMENT
 BUOY DEPLOYMENT
CHESAPEAKE BAY, MD
  DEPLOYED BUOY
CHESAPEAKE BAY, MD
CHESAPEAKE BAY, MD, DATA COMPARISON




  Infra-red port lockup caused some data loss (corrected in
  operational design).
      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
    WAVES (NOT MAIN RESEARCH GOAL)




  SignificantWave Height           Average Wave Period

•Wave height accuracy +/- 0.2 m (could reach +/- 0.1 m)
•Wave period accuracy +/- 1.0 s (could reach +/- 0.5 s)
                      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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