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