Overview Background Current constellation status Constellation performance GPS

Overview • • • Background Current constellation status Constellation performance GPS modernization Summary

GPS is Critical to U. S. Economic, Transportation and Safety Programs Space Power Grids Navigation and Tracking GPS as an Enabler • Aviation Direct Routing Commerce • Financial Transactions & Timing Aviation E 911 • Rail Capacity and Safety • Hazmat Tracking • Harbor Approaches Railroads Search &Rescue • E 911 Technology Maritime • Agricultural Productivity • Homeland Security “GPS is rapidly becoming an integral component of the emerging Global • Emergency Response Information Infrastructure, with applications ranging from mapping and • Communication Capacity surveying to international air traffic management and global change research. ” – • Timing Standard Presidential Decision Directive (NSTC)-6, March 1996 • Space Operations

GPS is Also Critical to US and Coalition Military Operations ISR Platforms AWACS ABCCC UAVs GPS as an Enabler • Targets hit – one weapon-one target • Distributed network time synch • Maintain ISR “on-station” orbits • Hot handoff between weapon and munitions • Refueling ops to maintain 24/7 • Pre-positioned strike packages • Target positions identified/geo-rectified • Fused multiple sensor-data • Synchronized target data hand-off • Space and air sensors tasked to search GPS grids • Orbiting shooters directed toward targets, initial target position data provided en-route • Shooter mission profile, SMBs updated with final target coordinates AOC Forward ORANGELAND YELLOWLAND

GPS Policy Presidential Decision Directive, 1996 • Recognized dual use nature of GPS – Enhances effectiveness of US and allied forces – Rapidly expanding civil, commercial market • Interagency responsibilities for Department of Defense, Transportation and State • Provided guidelines to operate and manage GPS – Encourage acceptance of GPS into peaceful civil, commercial and scientific applications – Promote safety and efficiency in transportation – Encourage private investment in/use of GPS – Strengthen and maintain national security – Promote international cooperation in using GPS for peaceful purposes

Constellation Status • 28 satellites on-orbit – 20 Block II/IIA satellites – 8 Block IIR satellites • GPS IIR-9 launched 31 Mar 03 • Next launch is scheduled, GPS IIR-10, Jul 03 • Three additional launches planned for FY 2004 – GPS IIR-11, GPS IIR-12, GPS IIR-M 1

Constellation Performance Exceeding requirements! PDOP Availability: • Requirement - PDOP of 6 or Less, 98% of the Time or Better • Actual - 99. 96408% Horizontal Service Availability • Requirement - 95% Threshold of 36 meters, 99% of the Time or Better • Actual – 3. 25 meters Vertical Service Availability • Requirement - 95% Threshold of 77 meters, 99% of the Time or Better • Actual – 4. 7 meters User Range Error • Requirement - 6 meters or Less, Constellation Average • Actual - 1. 34 meters All Errors Based on Dual Frequency, Signal in Space Only. Information Presented Reflects Data Collected During the Period from January 1, 2003 to February 4, 2003. Thresholds Provided Reflect Average Location Requirements from SPS Signal Specification Dated October, 2001.

GPS Modernization At-AGlance Increasing System Capabilities w Increasing Defense/ Civil Benefit Block IIA/IIR • Basic GPS • Std Service (16 -24 m SEP) • Single frequency (L 1) • C/A code navigation • Precise Service (16 m SEP) • Two frequencies (L 1&L 2) • P-code navigation Block IIR-M, IIF IIR-M: IIA/IIR capabilities plus IIR-M • 2 nd Civil Signal • Earth coverage Military Code • 1 st Launch 4 QFY 04 IIF: IIF IIR-M capability plus • 3 rd Civil Signal on L 5 • 1 st Launch 4 QFY 06 Flex Power upgrade adds ability to increase power on both P and M-Code signals to defeat low level enemy jamming Block III Evolutionary Acquisition: Acquisition • Navigation Surety - Increased AJ power - Increased security • Increased Accuracy • Assured Availability • Controlled Integrity • System Survivability • 1 st Launch FY 12

GPS Modernized Signal Evolution L 5 Present Signal L 2 L 1 C/A P(Y) M M P-like C/A P-like M C/A M P(Y) Modernized IIF C/A P(Y) Modernized IIR M C/A P(Y) Block III, w/Spot Beam 1176 Mhz • • • 1227 Mhz 1575 Mhz C/A: Coarse acquisition P(Y): Precise, encrypted military signal L 2: Adding C/A-type code L 1 & L 2: Adding new military signal (M-Code) L 5: Adding civil “safety of life” signal

GPS Enterprise Perspective Schedule System Capability Objectives Space Segment FY 02 03 04 05 06 07 SAASM IOC 08 SAASM OA 09 10 11 M-Code/ L 2 C IC L 5 IC 12 13 14 M-Code/ L 2 C FOC 15 18 19 L 5 Hi-Power-M FOC IC FOC M-Code (IIR-M / IIF) Launches 1 st IIF R&D Launches 1 st GPS III Launches 1 st Ops Launch SAASM Capable Development DT&E V 5. 5 Development DT&E Legacy V 5. 2 Development Full M-Code Capable V 6. 0 Code AIT System Test R&D M-Code and GPS IIIA OCS Hi-Power Capable Test SAASM UE 1 st Platform (CSEL) Available SAASM UE Production / Platform Installs 1 st MUE ready for 1 st Production / Integration Prototype M-Code UE Development Production / Platform Installs AIT – Assembly, Integration, & Testing CSEL – Combat Survivor Evader Locator MUE – M-code User Equipment SAASM – Selective Availability Anti-Spoofing Module Increasing % Fielding User Equipment 17 Heritage Launches 1 st IIR-M Control Segment 16

GPS IIR-M Description • • Modernized Signals • L 1 C/A, L 2 C, • L 1, L 2 P(Y) • L 1, L 2 M-Code • Flex Power Design Life • 10 Years 3 Rubidium Clocks 8 IIR-M Satellites • 1 st launch 4 QFY 04 IMPROVED SECURITY & ANTI-JAM

GPS IIF Description • • Modernized Signals L 1 C/A, L 2 C L 1, L 2 P(Y) L 1, L 2 M-Code L 5 New Civil Signal Flex Power Design Life 12 Years 2 Rubidium and 1 Cesium Clocks 12 -16 IIF Satellites 1 st Launch 4 QFY 06 IMPROVED ACCURACY, SECURITY & ANTI-JAM

GPS III Description The GPS III System Maintain Space User Service Second Civil Signal Third Civil Signal FIX FOM 1 N 42* 01” 46. 12” W 091* 38’ 54. 36” EL + 00862 ft • Assure the ability to separate, both spatially and spectrally, military and civil capabilities – High power in a focused area – Modernized signal architecture • Re-look at entire GPS Architecture to: – Achieve long term GPS performance goals – Reduce long term total ownership costs • Ensure best GPS system for the nation for the next 30 years • Program plan in-work for Do. D approval 1 ON 2 3 menu 4 5 6 7 WPT 8 POS 9 NAV CLR MARK 0 OFF NUM LOCK ZEROIZE Rockwell

Navstar GPS - Operational Control Segment Current System Description S-Band L-Band GPS Monitor Stations Schriever AFB, CO • • GPS Ground Antennas Master Control Station (MCS) Integrated Mission Ops Support Center Operational Support System AFSCN Command Control Segment (CCS) COLORADO SPRINGS GAITHERSBURG VANDENBERG Vandenberg AFB, CA HAWAII CAPE CANAVERAL • Crew Training Emulator ASCENSION Cape Canaveral, FL • Transportable Ground Antenna • Test Assets DIEGO GARCIA KWAJALEIN LMMDS, Gaithersburg, MD Backup Master Control Station (BUMCS)

Navstar GPS - Operational Control Segment Future System Description L-Band Schriever AFB, CO • New Master Control Station (NMCS) • Improved operator interfaces • IIR-M and IIF capabilities • Integrated Mission Ops Support Center • Operational Support System • GPS Support Facility • Launch and Early Orbit, Anomaly Resolution and Disposal Operations (LADO) System • System Simulator (crew training) GPS Monitor Stations NIMA Monitor Stations S-Band GPS Ground Antennas Vandenberg AFB, CA • Crew Training Emulator Cape Canaveral, FL VAFB, CA • System Simulator (AMCS) • Transportable Ground Antenna Alternate Master Control Station (AMCS) • Test Assets • System Telecom Simulator (IIF)

Summary • Sustaining constellation performance – Launching ~3 per year – Keeping 2 launch-ready • Modernizing by adding new signals and capabilities beginning next year • Planning to execute for the next generation GPS is a global utility – Department of Defense is committed to responsible stewardship

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Block II/IIA/IIR Baseline Signal Channel L 1 C/A -160 Measured Performance (d. BW) (II/IIA/IIR) -157. 7/-156. 9 L 2 C/A -166 -160. 4/-160. 2/-161. 1 Requirement: ICD-GPS-200 requires minimum received power as measured by +3 d. B linear antenna with an assumed 2 d. B atmospheric loss and other at End-of-Life Measured: Average RHCP received power at 5 degrees elevation across all satellites within block Modernization Baseline (IIRM/IIF) Signal Channel L 1 C/A Requirement (d. BW) -157. 7 Expected Performance (d. BW) -157. 5/-156. 1 L 2 C -160 -159. 3/-157. 7 L 5 Composite (IIF only) -154 -153 Requirement: Based average RHCP received power at 5 degree elevation with an assumed 0. 5 d. B atmospheric loss (Compliance to ICD 200 still required)