GPS Status & Modernization Briefing to National PNT Advisory Board 29 March 2007

1. GPS Status & Modernization Briefing to National PNT Advisory Board 29 March 2007 Col Allan Ballenger Commander, GPS Wing

2. Overview • GPS System Description • GPS Constellation Status & Availability • Recent GPS Accomplishments • GPS Modernization • Summary Department of Defense and Air Force are committedto responsible stewardship of GPS as a global utility

3. GPS System DescriptionMission

4. GPS System DescriptionGPS Enterprise • International Cooperation • Japan – QZSS • Russia - GLONASS • Europe and other countries • Department of Defense • Services (Army, Navy, AF, Marines) • Agencies (NGA, DISA, etc.) • Civil Applications • Search and rescue • Surveying and mapping • Trucking, shipping and Aviation • Banking and Finance • Offshore drilling • Fishing and boating • Department of Transportation • Federal Aviation Administration (FAA) • Department of Homeland Security • Coast Guard

5. GPS System DescriptionWhat Are the GPS Segments?

6. GPS Constellation Status & Availabilityas of March 2007 • 16 Block IIA satellites operational • 12 Block IIR satellites operational • 3 Block IIR-M satellites operational • 5 additional IIR-M satellites to launch • Since Dec 93, U.S. Government met/exceeded civil GPS service performance commitments • SPS Performance Standard (PS) • U.S. DoD committed to superior GPS service 30 Healthy Satellites Baseline Constellation: 24 as of 26 Mar 07

7. GPS Constellation Status & AvailabilityGrowing to 30+ Satellites • IIR-15(M) launched: Monday, 25 Sep 06 • Set healthy: Thursday, 12 Oct 06, SVN 52 - PRN 31 • 17 days from launch to on-orbit ops • IIR-16(M) launched: Friday, 17 Nov 06 • Set healthy: 13 Dec 06, SVN 58 - PRN 12 • PRNs 12 & 32 return to ops –allows growth to 32 SV constellation • Larger constellation for improved availability & accuracy PRN – Pseudo Random Noise (spreading code) SVN – Space Vehicle Number

8. Recent GPS Accomplishments • Launched a new era of GPS services • First GPS IIR-M (14) launched 25 Sep 05, operational 16 Dec 05 • New military signal (M-Code) and new civil signal (L2C) • GPS IIR-M (15) launched 25 Sep 06; IIR-16(M) launched 17 Nov 06 • Fielded operational improvements • Legacy Accuracy Improvement Initiative –improves position accuracy over 10% • Provide “zero age of data” to warfighters • Delivered 100,000+ DAGRs, 250,000+ SAASMs • OSD/NII signed Precise Positioning Service Performance Standard,23 Feb 07 – enables certification of military GPS use in US airspace • New acquisition strategies for next generation GPS • “Back to Basics” and incremental block approach • GPS Block III satellites • GPS Block III Next-Generation Control Segment (OCX) • Modernized User Equipment/Modernized Space Receiver

9. Recent GPS AccomplishmentsOur Mission Successes GPS IIR-14(M) 25 Sep 05 1st Modernized GPS Satellite GPS IIR-13 6 Nov 04 GPS IIR-15(M) 25 Sep 06 GPS IIR-16(M) 17 Nov 06 A world class team providing worldwide position, navigation & timing!

10. Accuracy Current Requirement Current Objective Recent GPS Accomplishments Continuous Performance Improvement • Key Measures of Effectiveness help evaluate GPS services • Accuracy • Bounded inaccuracy • Assured Availability • Integrity • Resistance to RF Interference/Jamming

11. Recent GPS AccomplishmentsLeveraging Civil/Commercial Technology

12. GPS ModernizationCapability Evolution Space Segment • Modernized(Block IIR-M) • 2nd civil signal (L2C) • M-Code signals (L1M, L2M) • Flex A/J power (+7dB) • Modernized(Block IIF) • 3rd civil signal (L5) GPS III(Block III) • Increased accuracy • Increased A/J power(up to 20 dB) • Signal integrity • Search and Rescue • Common signals with Galileo (L1C) • Legacy(Block IIA/IIR) • Basic GPS • C/A civil signal (L1C/A) • Std Pos. Service • Precise Pos. Service • L1 & L2 P(Y) nav • NDS Control Segment Legacy • TT&C • L1 & L2 monitoring Upgraded(AEP) • IIR-M IIF TT&C • WAGE, AII, LADO • SAASM • New MCS/AMCS Modernized(OCX V1) • New Architecture • Signal Monitoring GPS III(OCX V2) • GPS III TT&C • NAVWAR, GNOC • L1C, L2C, L5 • Flex Power • Real-Time C2 User Segment Legacy • Man Pack • MAGR, PLGR • RCVR-3A, 3S • OH, UH • FRPA, CRPA Upgraded • DAGR • CSEL Modernized • MUE • MSR • GAS-1 • MAGR2K • GB-GRAM

13. Summary • Sustaining capabilities for military and civil users worldwide • Maintain ground systems/on-orbit satellites, launch new satellites • Fielding GPS enhancements, such as Legacy Accuracy Improvement • Modernizing constellation with new signals and capabilities • First IIR-M launch Sep 05, first IIF launch 2008, first III launch 2013 • New civil and military GPS signals • Transitioning control segment from legacy to new architecture/systemby Summer ‘07 • Continuing work with Galileo and international community • Developing next generation of GPS • Acquisition strategies for space, ground, and user segments • Synchronizing space, control, and user equipment upgrades • “Back to Basics” focus and incremental block approach • ManagingGPS systems & supporting stakeholders • Technical baselines, interfaces, performance • Supporting/participating in key fora – NPEC/NPCO, DSB, IRT, PNT FACA Department of Defense and Air Force are committed to responsible stewardship of GPS as a global utility