Global Positioning System GPS Performance Standards PS Brig

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 1

Purpose of a PS n Precise Positioning Service (PPS) PS -- published Feb 2007: n Defines current service provided to military/authorized users n Do. D commitments for the PPS SIS n n Basis for military GPS safety certifications n n 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: n Defines service provided to non-military GPS users n Defines current Do. D commitments for the SPS SIS n n What SPS users can count on the SPS SIS to provide SPS PS is basis for all civil GPS safety certifications n Example: SPS use in IFR navigation by civil aviation Integrity - Service - Excellence 2

SPS PS Update Process PPS PS Published NPEC Tracks Task Feb 07 AF/A 3 S Tasking Draft SPS PS from AFSPC Mar 07 Apr 07 Jul 07 Air Staff Review NII Review Now Early 08 SPS PS Published 30 Apr ‘ 08 Integrity - Service - Excellence 3

Line of Demarcation SPACE SEGMENT SPS SIS INTERFACE CONTROL SEGMENT USER SEGMENT Integrity - Service - Excellence 4

Summary n Final Document expected in May 2008 n SPS PS will be a significant step forward Evolution of GPS performance n At the SIS interface that users plug into n Independent of receiver assumptions n When published, get it from the Web: http: //pnt. gov/ Integrity - Service - Excellence 2008 5

Questions? Integrity - Service - Excellence 6