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GPS Interagency International Actions Aligned to protect Navwar

Common thread: Navigation warfare (Navwar)Interagency cooperation: Flex Power, L1C,

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GPS Interagency International Actions Aligned to protect Navwar

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    1. Col Mark C. Crews, USAF Navstar GPS Chief Engineer GPS Interagency & International Actions – Aligned to protect Navwar

    2. Common thread: Navigation warfare (Navwar) Interagency cooperation: Flex Power, L1C, & L2C International collaboration: ITU, WGs, & NATO Summary

    3. Navigation Warfare (Navwar) – U.S. & Allied Military PNT Superiority US/Allied military success hinges on info superiority Before Navwar, GPS employed Selective Availability On 1 May 2000, Selective Availability was discontinued Current Navwar policy: deny hostile use of PNT Protect U.S. & Allied use of GPS signals Prevent hostile access to space-based PNT signals Preserve GPS signals access outside of area of mil ops GPS acquisition programs designed for Navwar Interagency & international activities are necessary to strengthen Navwar operations Navwar involves spectrum separation & denial ops

    4. GPS Signal Modernization – Spectrum

    5. U.S. Interagency Engineering Forum Engineering forum has representatives from all agencies Known as Nat’l PNT Engineering Forum (NPEF)

    6. Engineering Forum (NPEF) worked to align Navwar with civil signal operations “Flex power” transfer signal power between M & P(Y) on modernized satellites as needed by warfighter Problem: “Flex Power” can impact civil signal phase Some modes change L2C phase alignment Impacts semi-codeless high-precision receivers used for: Survey, agriculture, augmentation monitor stations Forum found win-win solution for “Flex Power” Preserved warfighter options, L2C civil signal stability

    7. GNSS Frequency Plans & Navwar

    8. International Telecommunication Union (ITU) ITU governs international use of radio frequency (RF) spectrum ITU filings: required to protect GPS signal spectrum Example: L5 R&D demonstration on IIR-20(M) ITU Radio Regulations require compatibility coordination between Radio Navigation Satellite Service (RNSS) systems RNSS systems afforded protection in order of ITU registration Later systems must get agreement from previously filed systems GPSW leads compatibility meetings, under aegis of State Dept and NTIA, with representatives from other RNSS systems Global/Regional RNSS systems GPS Augmentation systems (SBAS)

    9. GPS – a system of systems in the GNSS GPS Wing leads technical working groups on radio frequency & national security compatibility and interoperability Other systems in the GNSS Russia’s GLONASS, Europe’s Galileo, China’s COMPASS, Japan’s QZSS, India’s IRNS Compatibility is #1: radio frequency & national security Interoperability is #2: benefit civil users worldwide “Compatibility:” ability to use GNSS PNT services separately or together without interfering with individual and without adversely affecting Navwar “Interoperable:” ability of PNT services to be used together to provide better capabilities at the user level than would be achieved by relying solely on one service or signal

    10. International Working Groups Europe, Japan, Russia, India, & China (TBD) Compatibility Radio frequency compatibility No unacceptable interference National security compatibility Support Navwar options Deny hostile use of PNT in AOO Interoperability Supports signal design & spectrum sharing for combined services Focus on L1C & L5 Progress toward win-win situations Spectral separation/good interoperability with Galileo Five of six signals in QZSS are clones of GPS and SBAS GLONASS moving toward interoperable CDMA signals

    11. NATO Sub-Committee 8 (SC8) SC8 is the main forum for NATO navigation policy, guidance, and standardization Achieve seamless, interoperable Navwar operations and warfighter PNT superiority for U.S and our allies

    12. GPS International & Interagency Actions: Aligned to support Warfighters in Navwar! Coalition operations Hostile jamming response Put weapons on target Support Navwar ops

    13. Summary Maintaining GPS as Worldwide Standard for PNT Interagency cooperation Superb efforts for win-win in flex power & semi-codeless International collaboration Excellent cooperation with military allies worldwide Improving coalition warfare though robust reliable PNT

    14. Location Hacienda Hotel 525 N. Sepulveda Blvd. El Segundo, CA 90245 Dates/Topics Thursday, 22 May Navstar GPS Space Segment/User Segment L1C Interface (IS-GPS-800) Friday, 23 May Navstar GPS Space Segment/Navigation User Interfaces (IS-GPS-200) Navstar GPS Space Segment/User Segment L5 Interface (IS-GPS-705) Times Thursday (0800-1600) Friday (0800-1400) Co-Chairs GPSW/ENR: Capt Scott Cunningham SE&I: Mr. Thomas Davis

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