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The Global Positioning System: Serving the World

The Global Positioning System: Serving the World. July 19, 2006. Jason Y. Kim, Senior Advisor National Space-Based Positioning, Navigation, and Timing (PNT) Coordination Office Washington, D.C., USA. Overview. Introduction U.S. Policy GPS Performance Next-Generation GPS

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The Global Positioning System: Serving the World

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  1. The Global Positioning System:Serving the World July 19, 2006 Jason Y. Kim, Senior Advisor National Space-Based Positioning, Navigation, and Timing (PNT) Coordination Office Washington, D.C., USA

  2. Overview • Introduction • U.S. Policy • GPS Performance • Next-Generation GPS • International Cooperation

  3. The Global Positioning System • Baseline 24 satellite constellation in medium earth orbit • Global coverage, 24 hours a day, all weather conditions • Satellites broadcast precise time and orbit information on L-band radio frequencies • Two types of signals: • Standard (free of direct user fees) • Precise (U.S. and Allied military) • Three segments: • Space • Ground control • User equipment

  4. Nationwide Differential GPS Wide Area Augmentation System Continuously Operating Reference Stations Local Area Augmentation System U.S. Augmentations

  5. Differential GPS Networks Space-Based Augmentation Systems Global Differential GPS System International GNSS Service International Augmentations

  6. Commercial GPS Applications Span A Wide Range of Economic Activities Satellite Operations Power Grid Management Personal Navigation Surveying & Mapping Trucking & Shipping Aviation Communications Network Synchronization Recreation Railroads Fishing & Boating Offshore Drilling

  7. New Commercial Applications Are Developed Every Day • Open pit mining • Child safety • Automatic snowplow guidance • Spacecraft control • Power grid management • Wireless mobile applications

  8. GPS is a Global Public Service • Free access to civilian signals • One-way broadcast, like FM radio • Public domain documentation • Anyone can develop user equipment • Worldwide utility providing consistent, predictable, dependable performance • Critical component of global information infrastructure • Owned and operated by the U.S. Government • Paid for by U.S. taxpayers • Guided at a national level as multi-use asset • Acquired and operated by Air Force on behalf of USG Available Now—Empowering the Future

  9. Overview • Introduction • U.S. Policy • GPS Performance • Next-Generation GPS • International Cooperation

  10. U.S. Policy History • 1983: President Reagan offers free civilian access to GPS • 1996: GPS declared a dual-use system under joint civil/military management • 1997: Congress passes law requiring civil GPS to be provided free of direct user fees • 2004: President Bush issues new U.S. policy on space-based PNT

  11. Space-Based PNT Policy Objectives • Provide civil GPS and augmentations free of direct user fees on a continuous, worldwide basis • Provide open, free access to information needed to use civil GPS and augmentations • Improve performance of GPS and augmentations • Meet or exceed that of international systems • Improve resistance to interference for civil, commercial, homeland security, and scientific users worldwide • Seek to ensure that international space-based PNT systems are interoperable with civil GPS and augmentations • Or, at a minimum, are compatible

  12. Space-Based PNT Policy Objectives • Provide uninterrupted access to U.S. space-based PNT services for U.S./Allied national security purposes • Improve capabilities to deny hostile use of PNT without unduly disrupting civil and commercial access • Maintain GPS as a component of multiple sectors of the U.S. Critical Infrastructure • Plan for backup capabilities and services

  13. Organizational Structure WHITE HOUSE Defense Transportation NATIONALSPACE-BASED PNT EXECUTIVE COMMITTEE Co-Chairs: Defense, Transportation State ADVISORYBOARD Sponsor: NASA Commerce Homeland Security NASA COORDINATIONOFFICE Host: Commerce Joint Chiefs of Staff

  14. Overview • Introduction • U.S. Policy • GPS Performance • Next-Generation GPS • International Cooperation

  15. Constellation Status • 16 Block II/IIA satellites • 12 Block IIR satellites • Modernizing 8 remaining Block IIR satellites • 1 Block IIR-M satellite • Transmitting new second civil signal • Continuously assessing constellation health to determine launch need • Next launch: September 2006 29 Operational Satellites (Baseline Constellation: 24)

  16. Civil GPS Performance Standards U.S. commitments to civil GPS performance are documented in the GPS Standard Positioning Service Performance Standard (2001) In support of the service availability standard, 24 operational satellites must be available on orbit with 0.95 probability (averaged over any day). At least 21 satellites in the 24 nominal plane/slot positions must be set healthy and transmitting a navigation signal with 0.98 probability (yearly averaged). System accuracy far exceeds current standard

  17. . Improving GPS Performance with Augmentations Augmentations enhance GPS accuracy, monitor integrity • Sub-centimeter accuracy for geodesy, geology, etc. • 2-5 cm accuracy for real-time positioning, surveying, etc. • <3 m vertical accuracy with 6 second time to alarm for aviation

  18. GPS Performance with WAAS U.S. Federal Aviation Administration developed the Wide Area Augmentation System (WAAS) to provide necessary accuracy, integrity, and availability to support flight operations during all phases of flight Based on observations from January to March 2006. Results are valid when the Localizer Approach with Vertical Guidance (LPV) service is available. During this time frame, LPV was available 98% to 99% of the time. Augmented GPS fulfills rigorous user needs today

  19. Overview • Introduction • U.S. Policy • GPS Performance • Next-Generation GPS • International Cooperation

  20. Benefits of Next-Generation GPS • For civil users: • Higher standalone accuracy • Robustness against interference • Improved indoor, mobile, and urban use • Interoperability with other GNSS constellations • For military: Enhances navigation warfare • For all users: • System-wide improvements in accuracy, availability, integrity, and reliability • Backward compatibility • Maintains international competitiveness

  21. Evolution of GPS Performance 100 m or better 1990’s • L1 C/A Signal • Selective Availability On

  22. Evolution of GPS Performance 36 m or better TODAY • L1 C/A Signal • Selective Availability Off • Improved Orbit Information • L2C Signal (1 satellite)

  23. Evolution of GPS Performance Improved resistance to interference Increased range for RTK applications 1-3 m NEXT GENERATION • L1 C/A Signal (legacy users) • Selective Availability Off • Improved Orbit Information • L1C, L2C, L5 Signals

  24. Evolution of GPS Performance Improved resistance to interference Improved satellite availability Increased range for RTK applications ~1 m? NEXT GENERATION + COOPERATION • L1 C/A Signal (legacy users) • Selective Availability Off • Improved Orbit Information • L1C, L2C, L5 Signals • GNSS Interoperability

  25. GPS Modernization Program Increasing System Capabilities w Increasing Defense / Civil Benefit Block IIA/IIR Block IIR-M, IIF Block III • Basic GPS • Standard Service • Single frequency (L1) • Coarse acquisition (C/A) code navigation • Precise Service • Y-Code (L1Y & L2Y) • Y-Code navigation • IIR-M: IIA/IIR capabilities plus • 2nd civil signal (L2C) • M-Code (L1M & L2M) • IIF: IIR-M capability plus • 3rd civil signal (L5) • Anti-jam flex power • Backward compatibility • 4th civil signal (L1C) • Increased accuracy • Increased anti-jam power • Assured availability • Navigation surety • Controlled integrity • Increased security • System survivability

  26. Second Civil Signal • Designed to meet commercial needs • Freely available since Dec 2005 • Currently on 1 satellite • Will be on all future satellites • Expected to generate over $5 billion in user productivity benefits Benefits existing professional receivers Supports miniaturization, possible indoor use Increases accuracyfor consumers

  27. Third Civil Signal • Designed to meet demanding requirements for transport safety • May also enable global, centimeter-level accuracy using new techniques • Opportunity for international interoperability

  28. Fourth Civil Signal • Designed with international partners for interoperability • Modernized civil signal at L1 frequency • Original signal retained for backward compatibility • More robust navigation across a broad range of user applications • Improved performance in challenged tracking environments Under trees Inside cities

  29. Overview • Introduction • U.S. Policy • GPS Performance • Next-Generation GPS • International Cooperation

  30. U.S. GPS Cooperation • Ongoing cooperation with Europe, Japan, Russia • Compatibility and interoperability • National security • Level playing field in global markets • Seeking formal relations with Australia, India, Brazil • Multilateral cooperation • U.N. International Committee on GNSS • ICAO, IMO, NATO

  31. Europe • GPS-Galileo cooperation agreement signed in 2004 • Parties agreed to implement common signal on Galileo and GPS III • Working groups established: • Compatibility & Interoperability • Trade & Commercial Applications • Next-Generation GNSS • Security Issues June 26, 2004, press conference at U.S.-EU Summit in Ireland (U.S. Sec. of State Colin Powell, Irish Foreign Minister Brian Cowen, EU Vice-President Loyola De Palacio)

  32. Japan • World’s largest consumer of GPS technology • U.S.-Japan cooperation began in 1998 • Quasi-Zenith Satellite System (QZSS) • Regional system to complement, augment GPS over Japan • Will freely broadcast all GPS signals • GPS-QZSS interoperability achieved

  33. Russia • Cooperation started in 2004 • Working groups are pursuing GPS-GLONASS interoperability • Enhanced PNT through combined service • Combined search and rescue capabilities • Currently pursuing formal cooperation agreement GLONASS satellite

  34. Brazil • U.S. cooperating with DECEA on aviation uses of GPS • Brazil Test Bed for WAAS capability • Operational since 2001 • 1 master station, 5 reference stations • Heart of ICAO’s Caribbean and South American Test Bed • Led to discovery of geomagnetic equatorial ionosphere issue for GPS • GNSS Performance Monitoring System • Needed to comply with ICAO regulations • Will utilize Brazil Test Bed and other sites to monitor GNSS signals received in Brazilian airspace

  35. Rio de Janeiro testbed for Ground-Based Augmentation System Galeão and Santos Dumont airports Precision approaches with Hawker aircraft Unique, challenging environment for testing: geomagnetic equator, mountainous terrain, multiple airports, runways near water New CORS site in Fortaleza Cooperation among U.S. National Geodetic Survey, INPE, and two Brazilian universities SIVAM system for Amazon surveillance U.S. firm played major role in its development Brazil

  36. Brazil • U.S. Government is interested in expanding cooperation to broader mutual interests • Civil applications beyond aviation • Free market access, nondiscrimination • International standards • Preliminary discussions held in 2003 • Workshop hosted at AMCHAM São Paulo in 2004 Seeking to continue dialogue with Government of Brazil

  37. Summary • U.S. policy encourages worldwide use of civil GPS and augmentations • GPS performance is better than ever and will continue to improve • Augmentations enable high performance today • New GPS signal now available • Many additional upgrades scheduled • International cooperation is a priority • Compatibility and interoperability are critical • Opportunity for greater U.S.-Brazil partnership

  38. “Muito Obrigado!” National Space-Based PNT Coordination Office6822 Herbert C. Hoover Building Washington, D.C. 20230USA pnt.office@pnt.gov+1 (202) 482-5809 PNT.GOV

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