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10/05/07 3 NDGPS System Characteristics Accuracy 1 – 3 meters at up to 150 km (10 m requirement) 0.5 meter near the reference station 5 cm with post-processing (CORS) Many field users report better results Integrity 5 seconds at 100 bps 2.5 seconds at 200 bps Designed for Use in Impeded Environments U.S. Department of Transportation Research and Innovative Technology Administration
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10/05/07 1
Update on DOT Nationwide Differential GPS (NDGPS) Program
Presentation to:
National Space-Based Positioning, Navigation and Timing Advisory Board
Doubletree HotelWashington, DC
Timothy A. KleinSenior Policy Advisor/RITA NDGPS Coordinator
NDGPS@dot.gov
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 2
What is NDGPS?
• Nationwide Differential GPSAugmentation system composed of:
USGC/Maritime DGPS for Harbor/Entry Approach → 39 sites
USACE Sites for Inland Waterways → 9 sites DOT/Inland NDGPS for Terrestrial
Applications → 38 sites IOC = Single coverage over CONUSFOC = Dual coverage over CONUS Inland NDGPS currently 8 sites short of IOC
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 3
NDGPS System Characteristics
• Accuracy1 – 3 meters at up to 150 km (10 m requirement)0.5 meter near the reference station5 cm with post-processing (CORS)Many field users report better results
• Integrity5 seconds at 100 bps2.5 seconds at 200 bps
• Designed for Use in Impeded Environments
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 4
NDGPS Services
• NDGPS Provides to Multiple User Communities:Sub-meter accuracy in multiple terrestrial
applicationsAccurate real-time positioning in all surface
environments, including impeded environments (mountains, valleys, tunnels, urban canyons)
Post-processed data for increased accuracy for resource management and mapping
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 5
NDGPS Partnerships
• Partners Currently Relying on NDGPS DataNational and Cooperative Continuously
Operating Reference Stations (CORS) Robust backbone stations for CORS Post-processing for repeatable survey,
mapping, and resource management applications.
National Oceanic and Atmospheric Admin. National Weather Service/Water Vapor Space Weather Prediction Center
UNAVCO Tectonic Plate Monitoring
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 6
National Space-Based PNT ExecCom Action
• Action: DOT complete assessment of the need for inland component of NDGPSFinal resolution of to be determined by:
interagency requirements level of support
If no transportation requirements or other Federal user requirements, DOT intends to develop decommissioning plan for NDGPS
DOT cost share with other agencies possible if there is a transportation requirement
Due date: January 30, 2008
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 7
Assessment Activities• Federal Register Notice (Closed 10/1/07)
Seeks requirements for continuing current inland NDGPS operations, completing NDGPS IOC or FOC
Seeks funding partnershipsStates that if further investment not in public
interest, DOT will plan decommissioning • Letters to Federal Agencies (In Work)
Seeks mission requirements for NDGPSSeeks funding sponsorship
• Independent Assessment (ARINC)Assess private sector/commercial requirementsAssess economic impacts
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 8
NDGPS Funding• DOT FY08 Funding = $5M
Included in President’s request for DOT and in both Appropriations bills
Existing NDGPS maintenance and operations only; no construction/upgrade for sites
• DOT FY09 Funding = ??? If DOT does not fund inland NDGPS in FY09, USCG
has identified 12 DOT Funded Sites to preserve Maritime coverage.
• No matter the outcome for inland NDGPS, USCG will continue to operate and maintain Maritime DGPS
U.S. Department of Transportation
Research andInnovative TechnologyAdministration
10/05/07 9
Current Maritime + Inland NDGPS Coverage
Approximately 92% of the lower 48 states has single coverage and 65% has dual coverage.
10/05/07 10
Possible FY09 Maritime DGPS
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