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(SPS) Performance Standard GLOBAL POSITIONING SYSTEM STANDARD POSITIONING SERVICE PERFORMANCE STANDARD 5th Edition April 2020 Integrity - Service - Excellence Distribution Statement A: Approved for public release; distribution is unlimited April 2020 GPS SPS PS (This page intentionally left blank.) FOREWORD This document defines the levels of performance the U.S. Government makes available to users of the Global Positioning System (GPS) Standard Positioning Service (SPS). The GPS SPS Performance Standard underscores the U.S. commitment to cooperate with other global navigation satellite systems and augmentation system providers to ensure compatibility and interoperability of GPS with emerging systems for peaceful, civilian worldwide use. Please refer any questions or comments, in writing, to: Office of the Department of Defense Chief Information Officer Attn: Assistant for GPS, Positioning and Navigation 6000 Defense Pentagon Washington, DC 20301-6000 MOOREFIELD.FRE Digitally signed by MOOREFIELD.FREDERICK.D.12 DERICK.D.1229141 29141143 143 Date: 2020.04.15 12:05:55 -04'00' Frederick D. Moorefield, Jr. Deputy Chief Information Officer for Command, Control, and Communications April 2020 GPS SPS PS (This page intentionally left blank.) April 2020 GPS SPS PS TABLE OF CONTENTS List of Figures… ......................................................................................................... iii List of Tables.. ............................................................................................................ iii List of Appendices… .................................................................................................. iv Executive Summary… ................................................................................................ v SECTION 1.0 The GPS Standard Positioning Service ............................................. 1 1.1 Purpose.. ........................................................................................................................................ 1 1.2 Scope ............................................................................................................................................. 2 1.3 GPS SPS Definition ....................................................................................................................... 2 1.4 Backward Compatibility.................................................................................................................. 3 1.5 Key Terms and Definitions ............................................................................................................. 4 1.6 Global Positioning System Overview ............................................................................................. 4 1.6.1 GPS Space Segment (SS) .................................................................................................... 4 1.6.2 GPS Control Segment (CS) ................................................................................................... 7 SECTION 2.0 SPS SIS Characteristics and Minimum Usage Assumptions ............................................................................ 9 2.1 SPS SIS Interface Specification Requirements ............................................................................. 9 2.2 Overview of SPS SIS Interface Characteristics ............................................................................. 9 2.2.1 SPS SIS RF Characteristics .................................................................................................. 9 2.2.2 GPS NAV Message Characteristics ...................................................................................... 11 2.2.3 GPS SPS SIS Component Combinations ............................................................................. 14 2.3 Overview of SPS SIS Performance Characteristics ....................................................................... 15 2.3.1 SPS SIS Availability ............................................................................................................... 15 2.3.2 SPS SIS Health ..................................................................................................................... 16 2.3.3 SPS SIS Accuracy ................................................................................................................. 24 2.3.4 SPS SIS Integrity ................................................................................................................... 25 2.3.5 SPS SIS Continuity ................................................................................................................ 29 2.3.6 SPS SIS UTC(USNO) Accuracy ............................................................................................ 29 2.4 Usage Assumptions for SPS Performance Standards .................................................................. 30 2.4.1 SPS User ............................................................................................................................... 30 2.4.2 SPS SIS Configuration .......................................................................................................... 30 2.4.3 Single-/Dual-/Triple-Frequency Operation ............................................................................. 30 2.4.4 SPS SIS Health ..................................................................................................................... 30 2.4.5 Excluded Errors ..................................................................................................................... 32 2.4.6 “Dummy” Satellites ................................................................................................................ 33 SECTION 3.0 SPS SIS Performance Standards ....................................................... 35 3.1 Overview ........................................................................................................................................ 35 3.1.1 SPS SIS Performance Standards Organization .................................................................... 36 3.1.2 CM-Code, CL-Code, I5-Code, and Q5-Code SIS Performance Standards .......................... 36 3.2 24-Slot Constellation Definitions .................................................................................................... 37 3.3 SPS SIS Coverage ........................................................................................................................ 41 3.3.1 Per Satellite Coverage ........................................................................................................... 41 5th Edition Page i April 2020 GPS SPS PS 3.3.2 Baseline/Expandable 24-Slot Constellation Coverage .......................................................... 42 3.4 SPS SIS Accuracy ......................................................................................................................... 43 3.4.1 SPS SIS URE Accuracy Standards ....................................................................................... 44 3.4.2 SPS SIS URRE Accuracy Standards .................................................................................... 45 3.4.3 SPS SIS URAE Accuracy Standards .................................................................................... 45 3.4.4 SPS SIS UTCOE Accuracy Standards .................................................................................. 46 3.5 SPS SIS Integrity ........................................................................................................................... 47 3.5.1 SPS SIS Instantaneous URE Integrity Standards ................................................................. 47 3.5.2 SPS SIS Instantaneous URRE Integrity Standards .............................................................. 48 3.5.3 SPS SIS Instantaneous URAE Integrity Standards ............................................................... 49 3.5.4 SPS SIS Instantaneous UTCOE Integrity Standards ............................................................ 49 3.5.5 Psat and Pconst Standards ........................................................................................................ 50 3.6 SPS SIS Continuity ........................................................................................................................ 51 3.6.1 SPS SIS Continuity Standards – Unscheduled Failure Interruptions .................................... 51 3.6.2 SPS SIS Continuity Standards – Unscheduled Maintenance Interruptions .......................... 51 3.6.3 SPS Status and Problem Reporting Standards ..................................................................... 52 3.7 SPS SIS Availability ....................................................................................................................... 53 3.7.1 SPS SIS Per-Slot Availability Standards ............................................................................... 53 3.7.2 SPS SIS Constellation Availability Standards ....................................................................... 54 3.7.3 Operational Satellite Count Standards .................................................................................. 55 3.8 SPS Position/Time Domain Standards .......................................................................................... 56 3.8.1 PDOP Availability Standards ................................................................................................. 57 3.8.2 SPS Position Availability Standards .....................................................................................
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