1. 10/05/07 1 Update on DOT Nationwide Differential GPS (NDGPS) Program Presentation to: National Space-Based Positioning, Navigation and Timing Advisory Board Doubletree Hotel Washington, DC Timothy A. Klein Senior Policy Advisor/RITA NDGPS Coordinator NDGPS@dot.gov U.S. Department of Transportation Research and Innovative Technology Administration

2. 10/05/07 2 What is NDGPS? Nationwide Differential GPS  Augmentation 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 CONUS  FOC = Dual coverage over CONUS  Inland NDGPS currently 8 sites short of IOC U.S. Department of Transportation Research and Innovative Technology Administration

3. 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

4. 10/05/07 4 NDGPS Services NDGPS Provides to Multiple User Communities:  Sub-meter accuracy in multiple terrestrial applications  Accurate 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 and Innovative Technology Administration

5. 10/05/07 5 NDGPS Partnerships Partners Currently Relying on NDGPS Data  National 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 and Innovative Technology Administration

6. 10/05/07 6 National Space-Based PNT ExecCom Action Action: DOT complete assessment of the need for inland component of NDGPS  Final 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 and Innovative Technology Administration

7. 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 partnerships  States that if further investment not in public interest, DOT will plan decommissioning Letters to Federal Agencies (In Work)  Seeks mission requirements for NDGPS  Seeks funding sponsorship Independent Assessment (ARINC)  Assess private sector/commercial requirements  Assess economic impacts U.S. Department of Transportation Research and Innovative Technology Administration

8. 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 and Innovative Technology Administration

9. 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. 10/05/07 10 Possible FY09 Maritime DGPS