GLOBAL POSITIONING SYSTEM GPS CONSTELLATION STATUS December 1999

GLOBAL POSITIONING SYSTEM (GPS) CONSTELLATION STATUS December 1999 Captain Zannis Pappas HQ Air Force Space Command (DORS)

Overview • GPS Constellation Health/Status • Launch Schedule • Current Transition Plan • Summary

Constellation Health/Status 1 2 SLOT 3 4 5 SVN 38 A SVN 39 SVN 25 SVN 27 SVN 19 B SVN 22 SVN 30 SVN 13 SVN 35 C SVN 36 SVN 33 SVN 31 SVN 37 SVN 28 End of Life PLANE IIR-3 D SVN 24 SVN 46 SVN 17 SVN 34 SVN 15 E SVN 14 SVN 21 SVN 40 SVN 23 SVN 16 IIR-2 F SVN 32 SVN 26 SVN 18 SVN 29 SVN 43 27 Operational Satellites On Orbit

Launch Schedule • SCHEDULED GPS LAUNCHES FY 99 - FY 05: Block IIR Block IIF FY 00: 3 0 FY 01: 3 0 FY 02: 3 0 FY 03: 4 0 FY 04: 3 0 FY 05: 2 1

Current Transition Plan • Lockheed Martin Mission Systems (LMMS) • Upgrade Dedicated Monitor Stations and Ground Antennas with New Digital Receivers and Computers • Replace Existing Master Control Station Mainframe Computer With a Distributed Architecture • Add Accuracy Improvement Initiative, Air Force Satellite Control Network, and Full IIR Capabilities • Build Fully Mission Capable Alternate Master Control Station (AMCS) at Vandenberg Tracking Station • Boeing North America (BNA) • Add IIF Command Control Functionality 2 -Step Plan: Replace Existing Mainframe With Distributed Architecture Then Add Block IIF Functionality

Summary • GPS is a Healthy Constellation - 27 Operational Satellites - Navigation Payloads Operating Great • Block IIR - SVN 43 Bus and Navigation Payload Nominal - Solid Navigation Performance - 18 more pending Block IIR launches scheduled • Block IIF - Air Force has committed to purchase 6 Block IIF satellites for now, with an option (on a case by case annual basis) to procure a total of 30