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Differential GPS (DGPS)

. Differential GPS (DGPS) . Reference Station. Nationwide Differential Global Positioning System. Expanding the Maritime System into the Nationwide DGPS. What does NDGPS give me? System Characteristics. Accuracy 0.5 meter near the reference station Can degrade up to 1 meter/150 km

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Differential GPS (DGPS)

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  1. . Differential GPS (DGPS) ReferenceStation Nationwide Differential Global Positioning System (NDGPS)

  2. Nationwide Differential Global Positioning System Expanding the Maritime System into theNationwide DGPS

  3. What does NDGPS give me?System Characteristics • Accuracy • 0.5 meter near the reference station • Can degrade up to 1 meter/150 km • Typical accuracy is 1 to 3 meters • 2 to 5cm accuracy with Post Processing • Integrity • 5 seconds at 100 bps • 2.5 seconds at 200 bps • Availability is • >99.7% in areas of single coverage • >99.9% in areas of dual coverage Nationwide Differential Global Positioning System (NDGPS)

  4. International Standard • NDGPS is designed to an international, non-proprietary standard • Compliant with RTCM SC-104 and ITU-R M.823 • Greatly increases market for manufacturers • Enhances Global interoperability • Signal is free to all users • 35 countries operate compatible systems • Many other countries are planning systems • Resulting in a seamless international navigation system Nationwide Differential Global Positioning System (NDGPS)

  5. Acceptance of the international standard is leading to a seamless worldwide service.

  6. Maritime Use DGPS guides every type of craft fromsmall pleasure boats to large containerships Nationwide Differential Global Positioning System (NDGPS)

  7. Army Corps of EngineersDGPS in Dredging Army Corps of Engineers needs 2 meter accuracy to position their dredges. Nationwide Differential Global Positioning System (NDGPS)

  8. NDGPS RequirementsPositive Train Control • Provide Situational Awareness • Prevent accidents, saving over $60 million per year • Reduce fuel consumption by better pacing trains • Increase rail line capacity through closer train spacing, thus reducing the need for additional capital investment in plant and equipment Nationwide Differential Global Positioning System (NDGPS)

  9. NDGPS use in Surveying GPS has revolutionized the surveying industry. NDGPS provides survey grade accuracy when used in post processing applications. Nationwide Differential Global Positioning System (NDGPS)

  10. Nationwide DGPS Intelligent Transportation System • An integrated vehicle safety system consisting of DGPS & communication links will: • Automatically notify emergency personnel when an air bag is deployed, allowing for faster response to the exact location, thus saving some of the 41,000 people who die on U.S. roads each year. • Gives drivers Situational Awareness, preventing multi-car pile-ups • Automatically reroute trafficaround an accident, improvingtraffic flow. Nationwide Differential Global Positioning System (NDGPS)

  11. Hydrographic Surveys and Aerial Mapping Nationwide Differential Global Positioning System (NDGPS)

  12. NOAA’s Forecast Systems LabMeasuring Water Vapor NDGPS Site in Whitney, NE Water vapor is the most important component of weather and the least observed. DGPS reference stations continuously measure the water vapor in the atmosphere above the reference station, thus greatly improving short term weather forecasts. Nationwide Differential Global Positioning System (NDGPS)

  13. Precision Agriculture • Maximize use of resources • Optimized plowing of crop rows • Tailored applications of seeds, fertilizer, water, pesticides • Improved management of land, machinery, personnel, time • Greater crop yields • Net benefit: $5-14 per acre • Minimize environmental impacts • Localized identification and treatment of distressed crops reduces chemical use • Precise leveling of fields prevents fluid runoff Nationwide Differential Global Positioning System (NDGPS)

  14. Projected Coverageby the End of 2000 Nationwide Differential Global Positioning System (NDGPS)

  15. Nationwide Differential Global Positioning System (NDGPS) Captain Tom Rice Commanding Officer U.S. Coast Guard Navigation Center www.navcen.uscg.mil Phone: (703) 313-5888 Fax: (703) 313-5800 TRice@navcen.uscg.mil USCG Navigation Center 7323 Telegraph Road Alexandria, VA 22315-3940 Nationwide Differential Global Positioning System (NDGPS)

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