1. GPS Modernization 14 March 2005 CGSIC IISC Europe

2. 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. 3 Block IIA/IIR Block III Block IIR-M, IIF III: IIF capabilities & Improved civil signal (L1C) Increased accuracy (4.8-1.2m) Evaluating integrity improvements 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 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) GPS modernization balances military and civil needs GPS Modernization Plan

4. 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. 5 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 L2C code Begins with IIR-M sats First launch: May 2005 24 Satellites: 2012 Second Civil Signal (L2C)

6. 6 Third Civil Signal (L5) 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 L5 code Begins with IIF sats First launch: 2007 24 Satellites: 2014

7. 7 L1C Signal 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 L1C Begins with GPS III sats First launch: 2012 24 Satellites: 2017

8. 8 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 GPS III Status

9. 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. 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. 11 Current GPS Monitoring Stations

12. 12 GPS Monitoring Stations Accuracy Improvement Initiative (AII)

13. 13 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 Modernization Information