Transcript Global Positioning System (GPS) Performance Standards (PS) Brig Gen Donald Alston

Global Positioning System (GPS)
Performance Standards (PS)
Brig Gen Donald Alston
Director of Space and Nuclear Operations
DCS, Air, Space & Information
Operations, Plans & Requirements
4 October 2007
Integrity - Service - Excellence
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Purpose of a PS
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Precise Positioning Service (PPS) PS -- published Feb 2007:
 Defines current service provided to military/authorized users
 DoD commitments for the PPS SIS
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Basis for military GPS safety certifications
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What PPS users can count on the PPS SIS to provide
Example: Certifying PPS for use in safety of life applications
Standard Positioning Service (SPS) PS -- published Oct 2001:
 Defines service provided to non-military GPS users
 Defines current DoD commitments for the SPS SIS

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What SPS users can count on the SPS SIS to provide
SPS PS is basis for all civil GPS safety certifications
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Example: SPS use in IFR navigation by civil aviation
Integrity - Service - Excellence
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SPS PS Update Process
PPS PS
Published
NPEC
Tracks
Task
AF/A3S
Tasking
Feb 07
Draft SPS PS
from AFSPC
Mar 07
Apr 07
Air Staff
Review
Jul 07
NII Review
Now
Early 08
SPS PS
Published
30 Apr ‘08
Integrity - Service - Excellence
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Line of Demarcation
SPACE SEGMENT
SPS SIS
INTERFACE
CONTROL SEGMENT
USER SEGMENT
Integrity - Service - Excellence
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Summary
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Final Document expected in May 2008
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SPS PS will be a significant step forward
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Evolution of GPS performance
 At the SIS interface that users plug into
 Independent of receiver assumptions
When published, get it from the Web:
http://pnt.gov/
Integrity - Service - Excellence
2008
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Questions?
Integrity - Service - Excellence
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