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GPS Modernization

GPS Modernization

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GPS Modernization

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  1. GPS Modernization 14 March 2005 CGSIC IISC Europe

  2. Civil SatNav Applications • Enabling technology • Unlimited growth potential • $68 billion industry worldwide by year 2010 • Wide use in transportation safety • Aviation, maritime, railroad, highway, etc. • Potential to reduce land-based navigation systems • Centerpiece of future transportation infrastructure • Ever increasing range of civil uses • Telecommunications, surveying, law enforcement, emergency response, agriculture, mining, etc. • Used in conjunction with remote sensing • Supporting civil applications never envisioned

  3. GPS modernization balances military and civil needs GPS Modernization Plan Block IIA/IIR Block IIR-M, IIF Block III III: IIF capabilities & • Improved civil signal (L1C) • Increased accuracy (4.8-1.2m) • Evaluating integrity improvements • Navigation surety • Increased A/J power (+20 dB) 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) IIA / IIR: Basic GPS • C/A civil signal (L1C/A) • Std Service, 16-24m SEP • Precise Service, 16m SEP • L1 & L2 P(Y) nav

  4. Civil Benefits of GPS Modernization • New signals provide • Reduced vulnerability to interference • Calculation of ionospheric corrections at user site • Improvements in service performance in accuracy, availability, integrity, and reliability • Provide centimeter-level accuracy for scientific and survey applications • New spectrally separated signals • Preserve civil use outside areas of military ops • New commercial opportunities • Opportunity to converge services with other global satellite navigation systems

  5. L2C code Second Civil Signal (L2C) Begins with IIR-M sats First launch: May 2005 24 Satellites: 2012 • Benefits of L2C • Improves service for ~ 50,000 current scientific/ commercial dual-frequency users • Extends service for safety-of-life, single-frequency E-911 applications • Provides 24 dB better protection than C/A against code cross correlation and continuous wave (CW) interference • Signal defined in ICD-GPS-200C

  6. Third Civil Signal (L5) L5 code Begins with IIF sats First launch: 2007 24 Satellites: 2014 • Benefits of L5 • Improves signal structure for enhanced performance • Higher power (-154.9 dBW) • Wider bandwidth (24 MHz) • Aeronautical Radionavigation Services band • Co-primary allocation at WRC-2000 (1164-1215MHz) • Signal defined in IS-GPS-705

  7. L1C Signal L1C Begins with GPS III sats First launch: 2012 24 Satellites: 2017 • Benefits of L1C • Adds a modernized L1 civil signal • In addition to C/A code to ensure backward compatibility • Higher precision • Added interference protection • Enables civil interoperability with Galileo • Converges with Galileo L1 Open Service

  8. GPS III Status • Contracts awarded in January 2004 • To Lockheed and Boeing for 12-month requirements definition effort • Leading to Systems Requirements Review • Selection of final contractor anticipated in 2005 • First launch projected for 2012

  9. GPS III Civil Benefits • Significant increase in system accuracy • Improve robustness to interference • Improve level of unaugmented integrity • Improve availability of accuracy with integrity • Backward compatibility with existing receivers • Operational capability for L2C and L5 • In combination with GPS IIR-M and IIF satellites • Flexibility to respond to evolving requirements with limited programmatic impacts • Opportunity to converge with Galileo Open Service

  10. Legacy Improvement • Legacy Accuracy Improvement Initiative by Air Force and National Geospatial-Intelligence Agency in 2005 • Additional info decreases “Age of Data”, thus increasing accuracy in GPS satellite orbital position and clock data • Integrity Failure Modes and Effects Analysis • Knowledge of GPS failure modes required to design improved integrity monitoring systems • Continuing improvements to WAAS and NDGPS

  11. Current GPS Monitoring Stations

  12. GPS Monitoring Stations Accuracy Improvement Initiative (AII)

  13. Modernization Information • JPO GPS Modernization • http://gps.losangeles.af.mil/engineering/icwg/ • Navigation Information Service • http://www.navcen.uscg.gov • http://www.navcenter.org/ (mirror site) • E-mail: nisws@navcen.uscg.mil • Phone: +1 703 313 5900 • Fax: +1 703 313 5920