GNSS RESOURCES IN LOUISIANA – PRESENT AND FUTURE

J. Anthony Cavell, PLS, CFedSLouisiana State University, C4G

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

Sextant & Friends

Resection

USACE

Range-Azimuth

USACE

Range - Range

USACE

Dilution of Precision

USACE

GNSS

Augmentation … “Makes all the Difference”

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

Carrier (5mm to 5cm) Static baselines

Two or more receivers Kinematic (poor performance)

Post processing risky Real-Time Kinematic

Add radio and reduce risk

Enhanced Carrier Static baselines & Kinematic

CORS provide reliable tie to NSRS Real-Time Kinematic

Local networks add precision Ties to NSRS add accuracy

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

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!

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)

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.

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.

GULFNet

THANK YOU FOR YOUR ATTENTION.

J. Anthony Cavell, PLS, CFedSLSU C4G