Global Positioning System (GPS) Performance Standards (PS)

1
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

2
Purpose of a PS

• Precise Positioning Service (PPS) PS -- published
  Feb 2007
• Defines current service provided to
  military/authorized users
• DoD commitments for the PPS SIS
• What PPS users can count on the PPS SIS to
  provide
• Basis for military GPS safety certifications
• 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
• What SPS users can count on the SPS SIS to
  provide
• SPS PS is basis for all civil GPS safety
  certifications
• Example SPS use in IFR navigation by civil
  aviation

3
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
SPS PS Published
Early 08
30 Apr 08
4
Line of Demarcation
SPACE SEGMENT
SPS SIS INTERFACE
USER SEGMENT
CONTROL SEGMENT
5
Summary

• Final Document expected in May 2008
• SPS PS will be a significant step forward
• 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/
2008
6
Questions?