j. anthony cavell, pls, cfeds louisiana state university, c4g
TRANSCRIPT
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GNSS RESOURCES IN LOUISIANA – PRESENT AND FUTURE
J. Anthony Cavell, PLS, CFedSLouisiana State University, C4G
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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
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Sextant & Friends
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Resection
USACE
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Range-Azimuth
USACE
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Range - Range
USACE
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Dilution of Precision
USACE
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GNSS
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Augmentation … “Makes all the Difference”
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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
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Carrier (5mm to 5cm) Static baselines
Two or more receivers Kinematic (poor performance)
Post processing risky Real-Time Kinematic
Add radio and reduce risk
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Enhanced Carrier Static baselines & Kinematic
CORS provide reliable tie to NSRS Real-Time Kinematic
Local networks add precision Ties to NSRS add accuracy
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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
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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!
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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)
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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.
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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.
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GULFNet
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THANK YOU FOR YOUR ATTENTION.
J. Anthony Cavell, PLS, CFedSLSU C4G