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Nationwide Differential Global Positioning System

Overview of the development and benefits of Nationwide Differential Global Positioning System (NDGPS), its applications, high accuracy capabilities, and potential international collaboration. Contact Len Allen for more information.

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Nationwide Differential Global Positioning System

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  1. FederalRailroadAdministration Nationwide Differential Global Positioning System Leonard W. Allen III Acting Chief Track and Infrastructure Division Office of Research and Development Federal Railroad Administration Presented to: Russian Plenary Session GPS - Glonass December 2005

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

  3. Nationwide Differential Global Positioning System Expanding the Coast Guard’s DGPS into theNationwide DGPS

  4. Gooding Idaho M to G Mequon WI GWEN Klamath Falls OR NewSt. MarysWV New Poplar Bluff MO New Dandridge TN GWEN Essex CA New Marshall TX Funded Completion 2005-2006 GWEN Bobo MS New Big Lake TX Current NDGPS Coverage Approximately 92% of the lower 48 states has single coverage and 60% has dual coverage. Nationwide Differential Global Positioning System (NDGPS)

  5. International Standard • NDGPS is designed to an international, non-proprietary standard • Compliant with RTCM SC-104 and ITU-R M.823 • Increases market for manufacturers • Enhances Global interoperability • Signal is free to all users • 50 other countries operate compatible systems • Resulting in a seamless international navigation system Nationwide Differential Global Positioning System (NDGPS)

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

  7. Nationwide Differential Global Positioning System (NDGPS)Applications Nationwide Differential Global Positioning System (NDGPS)

  8. Five Categories of NDGPS Applications Categories of Applications Provides 1. Original Code-Based NDGPS Applications 1 - 3 meters Navigation, Precision Farming, Positive Train Control, Dredging, Buoy Positioning, Resource Management & GIS 2. Real-Time High Accuracy NDGPS Apps 10-15 centimeters Real-time Automated Surveying of Roads, Railroads & Harbors; Highway Lane Keeping; Machinery Control; & Auto-Docking of Ships 3. Post-Processing NDGPS Applications 1 - 3 centimeters Very Accurate Surveying, Mapping, & Hydrography 4. Stationary Scientific NDGPS Applications 2 - 3 millimeters Plate Tectonics Monitoring & Earthquake Prediction 5. Weather Forecasting Application Water Vapor Info

  9. High Accuracy NDGPS Program Objectives • Develop a nationwide 3-D dynamic positioning service that has an accuracy of less than 15 centimeter and time to alarm integrity of less than 2 seconds • Coexist with existing NDGPS infrastructure • Do not degrade existing NDGPS • Minimize deployment costs Nationwide Differential Global Positioning System (NDGPS)

  10. Broadcast Site Configuration DATA FORMATTER OBSERVABLES MODULATOR REFERENCE STATION DSP/Analog Card CORRECTIONS Rack Mount PC TRANSMITTER NDGPS DIPLEXER NDGPS &HA NDGPSTO ANTENNA TRANSMITTER HIGH ACCURACY NDGPS Nationwide Differential Global Positioning System (NDGPS)

  11. High Accuracy NDGPS 10-15 centimeters at 150 miles on a dynamic platform (boat). Nationwide Differential Global Positioning System (NDGPS)

  12. Development of High Accuracy DGPS International Standard • The United Kingdom, Germany and Japan have expressed an interest in working with the US on an international standard for High Accuracy DGPS. • Russia is a major user of DGPS. • The combination of Russia, Europe, Japan and U.S. represents about 90% of the world DGPS users. • Does Russia want to work with the UK, Japan, Germany and U.S. on development of an international standard for High Accuracy Differential GPS? • If so, I need contact information on Russia’s point of contact. Nationwide Differential Global Positioning System (NDGPS)

  13. Nationwide Differential Global Positioning System Len Allen Acting Chief Track and Infrastructure Division Office of Research & Development Phone: (202) 493-6329 Fax: (202) 493-6333 Leonard.Allen@fra.dot.gov Web: www.fra.dot.gov Federal Railroad Administration Office of R&D, Mail Stop 20 1120 Vermont Ave. N.W. Washington, DC 20590 Nationwide Differential Global Positioning System (NDGPS)

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