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GNSS Resources in Louisiana – Present and Future

J. Anthony Cavell, PLS, CFedS Louisiana State University, C4G. GNSS Resources in Louisiana – Present and Future. Global Navigation Satellite System. Currently GNSS's are GPS and GLONASS, Galileo is planned They supplant earlier systems Transit, STARFIX ®

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GNSS Resources in Louisiana – Present and Future

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  1. J. Anthony Cavell, PLS, CFedS Louisiana State University, C4G GNSS Resources in Louisiana – Present and Future

  2. Global Navigation Satellite System • Currently GNSS's are GPS and GLONASS, Galileo is planned • They supplant earlier systems • Transit, STARFIX® • Omega, LORAN, Decca VOR, Del Norte, Motorola, Cubic, EDM • Microwave (Autotape, MiniRanger, Microfix) • Beacons, Lighthouses, Tape, Sextant, Transit, Compass, Clock

  3. Sextant & Friends

  4. Resection • USACE

  5. Range-Azimuth • USACE

  6. Range - Range • USACE

  7. Dilution of Precision • USACE

  8. GNSS

  9. Augmentation … “Makes all the Difference”

  10. Code (<1m to 5m) • Differential • Two receivers and a reference • Real-Time Differential • Two receivers a reference and a radio • National DGPS • Coast Guard and Corps beacons • WAAS adds to the mix • Local networks add value

  11. Carrier (5mm to 5cm) • Static baselines • Two or more receivers • Kinematic (poor performance) • Post processing risky • Real-Time Kinematic • Add radio and reduce risk

  12. Enhanced Carrier • Static baselines & Kinematic • CORS provide reliable tie to NSRS • Real-Time Kinematic • Local networks add precision • Ties to NSRS add accuracy

  13. Real-Time Networks w/CORS • CORS provide confident network tie to NSRS • National CORS embedded in Network • Network data supports numerous scientific, engineering and surveying endeavors • Geology, Weather, Deformation, Construction

  14. High-Tech Louisiana • A challenging environment for surveyors • Towers used to extend surveys • Radio ranging followed early-on • Only private satellite navigation system, STARFIX® • NavBeacon use adopted early • Static GPS brought survey control to the marsh • Real-time kinematics methods enhanced topo, subsurface and boundary surveys • Subsidence renders benchmarks unreliable!

  15. 2001, An Important Year • LSU C4G deploys GULFNet in cooperation with national CORS program • NOAA/NGS reports that La. BM’s “unreliable.” • Seed planted to develop GULFNet Real-Time System (GRTS)

  16. LSU C4G & GULFNetThe Hub of Progress • C4G research provided crucial NOAA TR-50 • NGS used TR-50 to “validate” 80+ BMs after Hurricanes Katrina and Rita • By 2006 many more stations were added • National Weather Service uses GULFNet data to improve forecasts • In 2007 dream of LSU GRTS became reality • 2008 LSU C4G, GULFNet and GRTS cover the borders of the state except offshore.

  17. The Future • GULFNet provides better ties to the NSRS • GRTS provides construction, topo, hydro and navigation with heretofore unheard of speed and accuracy • The complex behavior of Louisiana geology will be measurable, reliably • … and much, much more.

  18. GULFNet

  19. J. Anthony Cavell, PLS, CFedS LSU C4G Thank you for your attention.

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