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GPS and Worldwide GNSS Interoperability

GPS and Worldwide GNSS Interoperability. EUPOS GNSS International Symposium Brussels, Belgium November 29, 2010. Kenneth Hodgkins Director Office of Space and Advanced Technology U.S. Department of State. Overview. U.S. Space-Based Positioning, Navigation and Timing (PNT) Policy

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GPS and Worldwide GNSS Interoperability

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  1. GPS and Worldwide GNSS Interoperability EUPOS GNSS International Symposium Brussels, Belgium November 29, 2010 Kenneth Hodgkins Director Office of Space and Advanced Technology U.S. Department of State

  2. Overview • U.S. Space-Based Positioning, Navigation and Timing (PNT) Policy • GPS Modernization Program • International Cooperation Activities

  3. Defense Transportation State Interior NATIONALEXECUTIVE COMMITTEEFOR SPACE-BASED PNT Executive Steering Group Co-Chairs: Defense, Transportation ADVISORY BOARD Sponsor: NASA Agriculture Commerce NATIONAL COORDINATION OFFICE Host: Commerce Homeland Security Joint Chiefs of Staff NASA GPS International Working Group Chair: State Engineering Forum Co-Chairs: Defense, Transportation U.S. National Space-Based PNT Organization Structure WHITE HOUSE Ad HocWorking Groups

  4. Overview • U.S. Space-Based Positioning, Navigation and Timing (PNT) Policy • GPS Modernization Program • International Cooperation Activities

  5. Increasing System Capabilities w Increasing Defense / Civil Benefit GPS Modernization Program 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

  6. GPS Modernization – New Civil Signals • Second civil signal “L2C” • Designed to meet commercial needs • Higher accuracy through ionospheric correction • Available since 2005 without data message • Currently, 7 IIR-Ms transmitting L2C • After 2020 with L2C and L5 online, the USG will no longer support semi-codeless access to military GPS signals • Full capability: 24 satellites ~2016 • Third civil signal “L5” • Designed to meet demanding requirements for transportation safety-of-life • Uses highly protected Aeronautical Radio Navigation Service (ARNS) band • On orbit broadcast 10 APR 2009 on IIR-20(M) secured ITU frequency filing • Is operational on 1st IIF (SVN-62) • Full capability: 24 satellites ~2018

  7. GPS Modernization – Fourth Civil Signal (L1C) • Fourth civil signal “L1C” • Designed with international partnersfor interoperability • Modernized civil signal at L1 frequency • More robust navigation across a broad rangeof user applications • Improved performance in challengedtracking environments • Original signal retained for backward compatibility • Specification developed in cooperationwith industry recently completed • Launches with GPS III in 2014 • On 24 satellites by ~2021 Under Trees Urban Canyons

  8. Overview • U.S. Space-Based Positioning, Navigation and Timing (PNT) Policy • GPS Modernization Program • International Cooperation Activities

  9. Satellite-Based Augmentations WAAS (3) MSAS (2) EGNOS (3) GAGAN (2) SDCM (2) Planned GNSS • Global Constellations • GPS (24+) • GLONASS (30) • Galileo (27+3) • Compass (27+3 IGSO + 5 GEO) • Regional Constellations • QZSS (3) • IRNSS (7)

  10. U.S. Objectives in Working with Other GNSS Service Providers • Ensure compatibility ― ability of U.S. and non-U.S. space-based PNT services to be used separately or together without interfering with each individual service or signal • Radio frequency compatibility • Spectral separation between M-code and other signals • Achieve interoperability – ability of civil U.S. and non-U.S. space-based PNT services to be used together to provide the user better capabilities than would be achieved by relying solely on one service or signal • Promote fair competitionin the global marketplace Pursue through Bi-lateral and Multi-lateral Cooperation

  11. International Committee on Global Navigation Satellite Systems (ICG)‏ • Emerged from 3rd UN Conference on the Exploration and Peaceful Uses of Outer Space July 1999 • Promote the use of GNSS and its integration into infrastructures, particularly in developing countries • Encourage compatibility and interoperability among global and regional systems • Met annually since 2006 • Members include: • GNSS Providers (U.S., EU, Russia, China, India, Japan) • Other interested Member States of the United Nations • International organizations/associations (including EUPOS)

  12. ICG Providers’ Forum • Six space segment providers listed previously are members • Purpose: • Focused discussions on compatibility and interoperability, encouraging development of complimentary systems • Exchange detailed information on systems & service provision plans • Exchange views on ICG work plan and activities • Providers have agreed that all GNSS signals and services must becompatible and open signals and services should be interoperable to the maximum extent possible • Providers also agreed to publish documentation that describes signal and system information, policies of provision and minimum levels of performance for its open services

  13. Recent Results of ICG-5October 17-22, 2010 in Turin, Italy • Develop a new approach to continued collection of user and industry views on interoperability – targeted questions and interviews • Investigate system time and geodetic reference frame aspects of interoperability within the WG-D task forces and complete templates by all system providers • Encourage interaction of ICG members with receiver manufacturers to solicit participation in the Asia-Oceania Multi-GNSS Demonstration Campaign • Prepare for discussions on the adoption of common reference assumptions for compatibility analyses • Focus on proposals to address interference detection and mitigation and draft a study plan for consideration by the ICG • Member States are encouraged to take appropriate action regarding “privacy jammers”

  14. Progress in GNSS Service Provision through ICG • Providers’ Forum • Providers Forum System Report (UNOOSA) • Principles of Compatibility, Interoperability, and Transparency • Template for Performance Standards (and ICDs) • Postulated Performance Standards for future services • Service Assurances or Commitments • Monitoring of service performance • Interference monitoring

  15. Summary • New civil GPS signals coming online now • GPS performance is better than ever and will continue to improve • U.S. policy encourages worldwide use of civil GPS and augmentations • International cooperation at all levels is a priority • Compatibility, Interoperability, and Transparency in open service provision are critical

  16. Contact Information Kenneth Hodgkins Director Office of Space and Advanced Technology U.S. Department of State OES/SAT, SA-23, Suite 410 Washington, D.C. 20006 +1.202.663.2398 (office)‏ Hodgkinskd@state.gov http://www.state.gov/g/oes/sat/ http://www.pnt.gov/international/

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