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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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