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GLOBAL POSITIONING SYSTEM (GPS)
CONSTELLATION STATUS
December 1999
Captain Zannis PappasHQ Air Force Space Command (DORS)
Overview
• GPS Constellation Health/Status
• Launch Schedule
• Current Transition Plan
• Summary
Constellation Health/StatusSLOT
1 2 3 4 5
PLANE
A SVN39
SVN22
SVN37SVN31 SVN28SVN36
SVN34SVN17 SVN15SVN24
SVN23SVN40SVN21SVN14
SVN32 SVN26 SVN18 SVN29
SVN25 SVN19
SVN30 SVN13 SVN35
SVN27
SVN33
SVN16
B
C
D
E
F
SVN38
27 Operational Satellites On Orbit
End of Life
SVN43IIR-2
SVN46IIR-3
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 and 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
- SVN43 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