2. Satellite Operation s Satellite Operation s TeleComm Oil Exploration Trucking & Shipping Surveying & Mapping Precision Agriculture GPS enables a diverse array of applications Power Grids IntelliDrive NextGen Transit Operations Transit Operations Disease Control Personal Navigation Personal Navigation Fishing & Boating

3. GPS Constellation Status Very robust constellation; exceeds user requirements 31 satellites currently in operation 11 GPS IIA 12 GPS IIR 7 GPS IIR-M 1 GPS IIF (set healthy 26 Aug 2010) 4 additional satellites in residual status 1 additional IIR-M waiting to be set healthy Global GPS civil service performance commitment met continuously since December 1993 Baseline Constellation = “24 Expandable” 3

4. 4 Ground Antenna Master Control Station (Schriever AFB) GPS Operational Control Segment (OCS) Ascension Diego Garcia Cape Canaveral Hawaii Kwajalein Schriever AFB Colorado S Korea Australia Bahrain S Africa England Argentina Ecuador Tahiti USNO Alaska Monitor Station NewZealand Vandenberg AFB California NGA Monitor Station OCS Monitor Station Ground AntennaFuture Monitor Station Master Control Station Alternate Master Control Station

5. 5 N/A 1.6 1.2 1.1 0.9 0 1 2 3 4 5 6 7 RMS SIS URE (m) RMS Signal-in-Space User Range Error (URE), meters 2008 SPS Performance Standard (Worst of any SPS SIS URE) 2001 SPS Performance Standard (RMS over all SPS SIS URE) N/A Selective Availability (SA) System accuracy exceeds published standard Signal-in-Space User Range Error is the difference between a GPS satellite’s navigation data (position and clock) and the truth, projected on the line-of-sight to the user 1990199219941996199720012004200620092008 Decreasing range error 1.0 Current GPS Accuracy

6. 6 GPS Modernization GPS II R / IIR-M 2005 IIA/IIR capabilities plus 2nd civil signal (L2C) M-Code (L1M & L2M) GPS IIA 1995 Standard Service Single frequency (L1) Coarse acquisition code navigation Precise Service Y-Code (L1Y & L2Y) GPS IIF 2010 IIR-M capability plus 3rd civil signal (L5) 12 year design life GPS III 2014 - 2025 Backward compatible 4th civil signal (L1C) Increased accuracy Increased integrity Architecture Evolution Plan (AEP) Next Generation Control Segment (OCX) Legacy Control System

7. 7 Latest U.S. Policy Provide continuous worldwide access for peaceful uses, free of direct user charges Encourage compatibility and interoperability with foreign GNSS services Operate and maintain constellation to satisfy civil and national security needs –Foreign PNT may be used to strengthen resiliency Invest in domestic capabilities and support international activities to detect, mitigate and increase resiliency to harmful interference

8. 8 Summary GPS performance is better than ever and will continue to improve –Augmentations enable even higher performance –New civil GPS signal available now –Many additional upgrades scheduled U.S. policy encourages worldwide use of civil GPS and augmentations –Permits U.S use of foreign PNT to increase resiliency International cooperation is a priority –Compatibility and interoperability are critical

9. 9 For Additional Information… GPS.gov PNT.gov

10. 10 Contact Information Hank Skalski DOT Liaison to Air Force Space Command Air Force Space Command Headquarters AFSPC/OST 150 Vandenberg St., Suite 1105 Peterson AFB, CO 80914 Phone: +01.719.554.2570 Fax: +01.719.554.6719 Email: Hank.Skalski@peterson.af.mil