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TESTING OF KGPS FOR TIDE APPLICATION TO HYDROGRAPHIC SURVEYS BY THE NAVAL OCEANOGRAPHIC OFFICE

TESTING OF KGPS FOR TIDE APPLICATION TO HYDROGRAPHIC SURVEYS BY THE NAVAL OCEANOGRAPHIC OFFICE. Objectives of the Test Plan are to determine: - Accuracy - Methods - Procedures. Gulfport Base Station. LSU-1 Tide Gage 7 N.M. ACOE Tide gage 10 N.M. GULFPORT. Base Station.

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TESTING OF KGPS FOR TIDE APPLICATION TO HYDROGRAPHIC SURVEYS BY THE NAVAL OCEANOGRAPHIC OFFICE

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  1. TESTING OF KGPS FOR TIDE APPLICATION TO HYDROGRAPHIC SURVEYS BY THE NAVAL OCEANOGRAPHIC OFFICE

  2. Objectives of the Test Plan are to determine: - Accuracy - Methods - Procedures

  3. GulfportBase Station LSU-1 Tide Gage 7 N.M. ACOE Tide gage 10 N.M.

  4. GULFPORT Base Station Tide gage KGPS Buoy

  5. Test Plan: - Establish an offshore tide gage - Measure the distance between spheroid and chart datum at the gage - Place a KGPS buoy alongside the tide gage - Run survey lines near the buoy in kinematic mode to correct for tides (Real time and post-processing) - Compute buoy chart datum distance from spheroid and compare to tide gage distance - Compare kinematic tide corrections to tide gage corrections

  6. KGPS Buoy built by Planning Systems Incorporated

  7. BUOY CAPABILITIES Buoy Dimensions: Hull diameter 6.25 feet Overall height: 17 feet Weight: 900 lbs Sensors: 3-axis Acceleration 3-axis Magnetometer Vertical Reference Hull depth pressure sensor GPS- Novatel OEM4 L1/L2 with GPS600 antenna CPU and 20 GB HDD Power: Four solar panels Sealed batteries Warning system: Flashing obstruction light Radar reflector

  8. s = seasonal change n= no.of obs. Zoo = distance of long term MSL to chart datum C = vertical distance from phase center to water surface while stable WGS-84 Ellipsoid . b a Buoy phase center C + accel. & tilt corr. Water surface t Observed MSL Zoo - s Chart Datum

  9. ERROR SOURCES: - Squat-settlement will have to be removed from GPS height results to make a direct comparison with the tide gage. - Measured vertical distance at offshore gage from the GPS antenna to zero of gage not easily measured. - Receiver noise, multipath and distance from base station result in errors in GPS - Error occurs in datum transfer of chart datum - Acceleration and tilt errors occur at the buoy and vessel - Other systematic and random errors are possible

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