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GNSS Modernization Program and GPS Policies Long-Term Considerations for Networks

GNSS Modernization Program and GPS Policies Long-Term Considerations for Networks. Larry Hothem Antarctic Remote Observatory Meeting Boulder, CO 19-20 Sept. 2004. GPS National Policy Review Constellation Status Modernization program New civil signals US-EC GPS-Galileo agreement

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GNSS Modernization Program and GPS Policies Long-Term Considerations for Networks

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  1. GNSS Modernization Program and GPS Policies Long-Term Considerations for Networks Larry Hothem Antarctic Remote Observatory Meeting Boulder, CO 19-20 Sept. 2004

  2. GPS National Policy Review Constellation Status Modernization program New civil signals US-EC GPS-Galileo agreement Considerations for the Future Summary GNSS Modernization Program and GPS Policies Long-Term Considerations for Networks

  3. Interagency GPS Executive Board (IGEB) Defense Transportation State Commerce Agriculture Interior NASA Joint Chiefs of Staff Established in 1996

  4. GPS National Policy Review • Space-Based Positioning, Navigation, and Timing (PNT) Policy • The need for a revised policy • Update and improve existing management mechanisms for GPS and augmentations • Recognizes that GPS has evolved into a global utility • Need to focus more effectively on development, acquisition, operation, sustainment, and modernization • Anticipate public release early Fall 2004 • Replaces GPS policy adopted in March 1996

  5. GPS National Policy Review • Constellation Status • Modernization program • New civil signals • US-EC GPS-Galileo agreement • Considerations for the Future • Summary

  6. Constellation SummarySince 1 Jan 04 • 29 operational on-orbit satellites • 3 satellites launched • SVN47(PRN22): 20 Dec 03 • SVN59(PRN19): 20 Mar 04 • SVN60(PRN23): 4 Jun 04 • 1 satellite disposed • SVN13: 29 Apr 04

  7. Constellation Status Summary • 18 SVs past design life (7.5 years) • 15 SVs past updated mean mission duration • 13 SVs one component away from nav mission failure • 8 SVs one component away from bus failure DESPITE AGE AND COMPONENT ISSUES, THE CONSTELLATION IS EXCEEDING EXPECTATIONS BY PROVIDING SOLID NAVIGATION AND TIMING PERFORMANCE

  8. GPS Space and ControlClock and Reaction Wheel Performance Status(as of 1 Aug 2004) Clock meets spec watch list dead unused in use Wheel functional watch list dead launch date SVN (PRN) Clock* Wheel 1 2 3 4 1 2 3 4 * II/IIA = Rb, Rb, Cs, Cs IIR = Rb, Rb, Rb Diagonal Line = Unhealthy PLANE A C D E F B 39A(09) 06/93 56R(16) 1/03 41R (14) 11/00 24A (24) 07/91 36A (06) 03/94 51R (20) 05/00 1 SLOT 25A (25)02/92 33A (03) 03/96 46R (11)10/99 30A(30) 9/96 47R(22)12/03 26A (26)07/92 2 43R(13) 07/97 44R(28) 07/00 38A (08) 11/97 45R (21) 03/03 40A (10) 07/96 59R (19) 03/04 3 34A (04) 10/93 35A (05) 08/93 54R (18) 01/01 60R (23) 06/04 27A (27) 09/92 37A (07) 05/93 4 31A (31) 03/93 29A (29) 12/92 15 (15) 10/90 5 17 (17)12/89 32A (01) 11/92 6

  9. GPS National Policy Review • Constellation Status • Modernization program • New civil signals • US-EC GPS-Galileo agreement • Considerations for the Future • Summary

  10. Modernization GPS modernization balances military and civil needs Block IIR-M, IIF Block III Block IIA/IIR IIR-M: IIA/IIR capabilities & • 2nd civil signal (L2C) • New military code • Flex A/J power (+7dB) IIF: IIR-M capability plus • 3rd civil signal (L5) III: IIF capabilities & • Improved civil signal (L1C) • Increased accuracy (4.8-1.2m) • Navigation surety • Increased A/J power (+20 dB) IIA / IIR: Basic GPS • C/A civil signal (L1C/A) • Std Service, 16-24m SEP • Precise Service, 16m SEP • L1 & L2 P(Y) nav

  11. Test IOC FOC GPS Enterprise Perspective ScheduleFY05 PB Baseline FY 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 GPS Capabilities Test IOC / FOC SAASM Baseline Approval Test IOC FOC M-Code Test IOC FOC Flex-Power Test IOC FOC L2C Test IOC FOC L5 Test IOC FOC GPS III 1st IIRM IIRM-2 IIRM-8 IIR-M Space Segment Dev 1st IIF IIF-10 IIF-16 IIF Dev ATP KDP B 1st GPS III III-2 III-8 III-18 III-30 GPS III Concept Dev Flex / Civil IIRM IIF SAASM M-Code Control Segment IIR-M / IIF Dev ATP TT&C NAV Final GPS III Concept Dev Mobility / Tankers / Munitions Bombers / Strikers User Equipment SAASM UE Vendors SAASM Bombers / Strikers / C4ISR Contract Award RCVR Card Ready for Prod LRU I&T Mobility / Tankers IOT&E Comp MUE Dev Production Concept Development JPO Approved Baseline Based on FY05 PB Updated as of: 23 Aug 04 SMR

  12. GPS National Policy Review • Constellation Status • Modernization program • New civil signals • US-EC GPS-Galileo agreement • Considerations for the Future • Summary

  13. L2C Second Civil Signal Benefits of L2C Improves PNT for ~ 50,000 current scientific/commercial dual frequency users Extends safety-of-life, single-frequency E-911 applications Provides better protection (24 dB) than C/A against code cross correlation and continuous wave (CW) interference Improved data structure for enhanced data demodulation (5 dB better than C/A) L2C code

  14. L5 Third Civil Signal Improves signal structure for enhanced performance Higher power (-154.9 dBW) Wider bandwidth (24 MHz) Longer spreading codes in the navigation message Aeronautical Radionavigation Services band Co-primary allocation at WRC-2000 (1164-1215MHz) L5 signal definition in IS-GPS-705 L5 code

  15. New L1C Signal Improvements Tech solutions exist to add a modernized L1 civil signal Implementation will provide C/A code to ensure backward compatibility Assured of 1.5 dB increase in minimum C/A code power to mitigate any noise floor increase Enables greater civil interoperability with Galileo L1C

  16. GPS National Policy Review • Constellation Status • Modernization program • New civil signals • US-EC GPS-Galileo agreement • Considerations for the Future • Summary

  17. Galileo and GPS:Interoperability and Compatibility GPS and Galileo civil signals should be very similar Opportunity for U.S. and Europe to agree on a common signal structure at L1 with optimum interoperability Same center frequency, same spectral characteristics Enable common civil receiver designs Obtain even better user navigation performance

  18. BOC(1,1) OS BOC(15,2.5) PRS Galileo signals spectrally separated from M-code signal -- US and Europe achieve compromise Baseline Galileo Signals in Agreement Signed June 2004

  19. GPS National Policy Review • Constellation Status • Modernization program • New civil signals • US-EC GPS-Galileo agreement • Considerations for the Future • Summary

  20. Considerations for the FutureReceiver capabilities • Minimum number of GPS SVs tracked: currently and in the future requires more than 12 in polar regions • IIR-M – first launch in 2005 with new L2C civil signal • 18 or more SVs in constellation by 2010 (maybe early as 2009) • Current manufacturers with L2C capability: Septentrio and Trimble – 3rd manufacturer by March 2005 • IIF – first launch in 2006 with new L5 civil signal • 18 or more SVs in the constellation (2013?) • Other GNSS Systems • Galileo deployment – 2008? • GLONASS – restored to 24 satellites using modernized SVs? • GPS-III • First launch in 2012? • May include modernized signal for L1 (L1C)

  21. Summary Sustaining constellation performance Launching ~3 per year Fielding GPS augmentations such as L-AII Modernizing by adding new signals and capabilities beginning with first IIR-M1 launch in 2005 and first IIF launch in 2006 New civil and military GPS signals available starting next year Looking ahead with US-EC GPS-Galileo agreement Planning to execute for the next generation Further enhancements continuing through GPS III GPS III – study contracts awarded in January 04

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