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Space-Based PNT Modernization Update

Space-Based PNT Modernization Update. National Space-Based PNT Coordination Office. National Space-Based PNT Coordination Office. March 2006. OVERVIEW. Background GPS Status & Modernization Augmentations Status Summary. GPS Status & Modernization Augmentations Status

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Space-Based PNT Modernization Update

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  1. Space-Based PNT Modernization Update National Space-Based PNT Coordination Office National Space-Based PNT Coordination Office March 2006

  2. OVERVIEW • Background • GPS Status & Modernization • Augmentations Status • Summary

  3. GPS Status & Modernization • Augmentations Status • Summary Background

  4. GPS Background • Active program for over 30 years • Created from separate programs in 1973 • Developmental satellites began launch in 1978; operational satellites in 1989 • Initial Operational Capability in 1993; Full Operational Capability in 1995 • Developed as a dual-use system • Military applications for US and Allied use • Civilian applications for worldwide use

  5. Background • Augmentations Status • Summary GPS Status & Modernization

  6. GPS Constellation Status 29 Operating Satellites (to ensure 24) • 16 Block II/IIA satellites operational • 12 Block IIR satellites operational • Modernizing up to 8 Block IIR satellites • 1 Block IIR-M in orbit (launched Sep 25) • Set healthy on December 16, 2005 • 2nd IIR-M launch currently being scheduled • No earlier than May 25, 2006 • Continuously assessing constellation health to determine launch need • Global GPS civil service performance commitment met continuously since Dec 93 Illustration reprinted courtesy of the GPS Joint Program Office

  7. GPS User Range Error (URE) History Accuracy Specification Actual Performance As of July2005 System accuracy far exceeds current specification

  8. Why Modernize? • For civil users, new signals provide: • More robustness against interference • Compensation for ionospheric delays • For military users, new spectrally separated signals provide: • Protection of friendly use • Prevention of adversary exploitation • Preservation of civil use outside area of operations • For both civil/military, system improvements in accuracy, availability, integrity, and reliability

  9. The GPS Modernization Path 14 GPS Modernization Source: GPS Joint Program Office

  10. L2C code Second Civil Signal (L2C) Begins with IIR-M sats 24 Satellites: ~ 2012* • Improves service for ~ 50,000 current scientific/ commercial dual-frequency users • Overcomes some limitations of the existing civil GPS signal (L1 C/A) • Higher effective power and improved data structure will reduce interference and may enable better indoor use • Can be broadcast from an almost unlimited number of satellites * Based on current schedule

  11. Third Civil Signal (L5) Begins with IIF sats 24 Satellites: ~ 2015* L5 code • New signal structure for enhanced performance • Higher power & wider bandwidth than other GPS civil signals • Improves resistance to interference • Frequency located in Aeronautical Radionavigation Services band (1164-1215MHz) * Based on current schedule

  12. Ground Control Modernization • New Master Control Station with: • Improved operator interfaces • IIR-M and IIF capabilities • Integrated Mission Operations Support Center • Fully mission capable Alternate Master Control Station • Legacy Accuracy Improvement Initiative • Information from additional reference stations: • Doubles amount of data being used for signal integrity and constellation performance monitoring • Doubles amount of data used for satellite time and position estimation, resulting in more accurate satellite orbital position and clock data available to users

  13. Current GPS Monitoring Stations Cape Canaveral USAF Sites – 6

  14. Future GPS Monitoring Stations Accuracy Improvement Initiative (AII) Cape Canaveral NGA Sites, AII – 6 NGA Sites, Non-AII -- 5 USAF Sites -- 6

  15. GPS III Goals • Increased system accuracy • Improved level of unaugmented integrity • Improved availability of accuracy with integrity • Backward compatibility with existing receivers • Support for new signals in combination with IIR-M & IIF satellites (L2C, L5, new military signals) • Additional new L1 civil signal (L1C) and future options for new navigation messages, flexible power levels • Smoothtransition from GPS Block II to Block III

  16. L1C Signal Begins with GPS III sats First launch: ~ 2013* L1C • Modernized L1 civil signal • In addition to C/A code to ensure backward compatibility • Binary Offset Carrier [BOC] (1,1) modulation • Increased robustness and potentially accuracy for civil users • Proposed as a common baseline L1 open service signal for GPS & Galileo * Based on current schedule For additional information contact: L1C_GPS@USGS.gov

  17. GPS Modernization Schedule

  18. Background • GPS Status & Modernization • Summary Augmentations Status

  19. Wide Area Augmentation System (WAAS) • WAAS consists of: • 25 Reference Stations • More being added in Canada/Mexico • 2 Master Stations • 2 Geosynchronous Satellites • 3 Uplink Stations • WAAS augments GPS to meet the integrity, availability, accuracy, and continuity for use in all phases of flight Illustration reprinted courtesy of the U.S. Department of Transportation • GPS/WAAS - primary navigation system in US national airspace • WAAS Commissioned in July 2003 • En-route through approach • Allows reduction in ground-based navigation aids • Interoperable with European EGNOS, Japanese MSAS, and Indian GAGAN

  20. Maritime Differential GPS System • Designed to an international, non-proprietary standard with frequencies optimum for surface transportation • 50 countries operate compatible systems resulting in a seamless international navigation system

  21. International GPS/GNSS Service • Network of over 350+ stations throughout the globe • Precision geodetic receivers produce GPS data on a continuous basis, ~ 35 also track GLONASS • Over 200 contributing organizations throughout 80 countries • A service of the International Association of Geodesy (IAG) since January 1, 1994 • Advocates an open data policy, equal access • Highest accuracy GPS & GLONASS satellite orbits anywhere • 3-5 cm GPS , ~25-30cm GLONASS • mm-level station positions and velocities • IGS Central Bureau at NASA/Jet Propulsion Lab responsible for day-to-day management and coordination • Global Data Center at NASA Goddard Space Flight Center

  22. Background • GPS Status & Modernization • Augmentations Status Summary

  23. Summary • GPS is rapidly evolving into a key part of the global infrastructure • Civil service continues to exceed performance standards • Next step in Modernization has begun • IIR-M launch with L2C and M-code • Enhancements will continue through GPS III • Augmentations continue to be an integral component of U.S. Space-Based PNT Services Continuously Improving GPS & Augmentation Services are benefiting users worldwide

  24. National Space-Based PNT Coordination OfficeHerbert C. Hoover Building, Rm. 682214th & Constitution Ave., NWWashington, D.C. 20230Phone: 001.202.482.5809Fax: 001.202.482.4429PNT.Office@pnt.govhttp://pnt.gov/

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