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WAAS Performanace Analysis Report

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WAAS Performanace Analysis Report This document was revised on December 14, 2017 to correct figure captions 4-6 through 4-9. WAAS Performance Analysis Report April 2017 WIDE AREA AUGMENTATION SYSTEM PERFORMANCE ANALYSIS REPORT Report #60 Reporting Period: January 1 to March 31, 2017 April 2017 FAA William J. Hughes Technical Center NSTB/WAAS T&E Team Atlantic City International Airport, NJ 08405 http://www.nstb.tc.faa.gov/ WAAS Performance Analysis Report April 2017 Executive Summary Since 1999, the Wide Area Augmentation System (WAAS) Test Team at the Federal Aviation Administration (FAA) William J. Hughes Technical Center has reported Global Positioning System (GPS) performance as measured against the GPS Standard Positioning Service (SPS) Signal Specification in quarterly GPS Performance Analysis Network (PAN) Reports. In addition to the GPS PAN reports, the WAAS Test Team has provided quarterly reports on WAAS performance. The current WAAS PAN Report #60 provides WAAS-performance data from the January 1 through March 31, 2017 reporting period. This report provides the following results: accuracy, availability, coverage, safety index, range accuracy, WAAS broadcast message rates, geostationary satellite ranging availability, WAAS airport availability, WAAS Code Noise and Multipath analysis, WAAS reference station survey validation, and WAAS Signal Quality Monitoring. The WAAS system support modification cutover began August 2015 with the first WAAS system upgrade to G3 receivers on September 4, 2015 in Seattle, WA. This was done in preparation for a full constellation of dual civil frequency GPS satellites (L1/L5). The WAAS system upgrade to G3 receivers was completed on May 17, 2016. The following table shows observations for accuracy and availability made during the reporting period for Continental United States (CONUS) and Alaska sites (the international sites are presented in the body of this report). Localizer Performance (LP) service is available when the calculated Horizontal Protection Level (HPL) is less than 40 meters. Localizer Performance with Vertical Guidance (LPV) service is available when the calculated HPL is less than 40 meters and the Vertical Protection Level (VPL) is less than 50 meters. Localizer Performance with Vertical Guidance to 200-foot decision height (LPV200) service is available when the calculated HPL is less than 40 meters and the VPL is less than 35 meters. The FAA’s National Satellite Test Bed sites—Grand Forks, Atlantic City, and Arcata—are outliers due to receiver quality issues, and not because of the WAAS signal in space quality. Parameter CONUS CONUS Alaska Alaska Site/Maximum Site/Minimum Site/Maximum Site/Minimum 95% Horizontal Accuracy Atlantic City Salt Lake City Anchorage Bethel (HPL <= 40 meters) 1.322 meters 0.582 meters 0.738 meters 0.575 meters 95% Vertical Accuracy Miami Denver Barrow Bethel (VPL <= 50 meters) 1.662 meters 0.744 meters 1.362 meters 0.987 meters LP Availability All Sites All Sites All Sites All Sites (HPL <= 40 meters) 100% 100% 100% 100% LPV Availability (HPL <= 40 meters & All Sites All Sites Multiple Sites Barrow VPL <= 50 meters) 100% 100% 99.98% 99.98% LPV200 Availability Kotzebue (HPL <= 40 meters & Multiple Sites Oakland Multiple Sites 99.99% VPL <= 35 meters) 100% 99.33% 100% Cleveland Denver Cold Bay Juneau 99% HPL 15.57 meters 10.97 meters 20.60 meters 13.09 meters Oakland Kansas Barrow Juneau 99% VPL 32.50 meters 18.52 meters 34.847 22.53 meters Report 60 i WAAS Performance Analysis Report April 2017 TABLE OF CONTENTS 1.0 INTRODUCTION .............................................................................................................................................. 1 1.1 Event Summary .......................................................................................................................................... 4 1.2 Report Overview ...................................................................................................................................... 13 2.0 WAAS POSITION ACCURACY ................................................................................................................... 15 3.0 AVAILABILITY .............................................................................................................................................. 31 4.0 COVERAGE .................................................................................................................................................... 50 5.0 INTEGRITY ..................................................................................................................................................... 61 5.1 HMI Analysis ........................................................................................................................................... 61 5.2 Broadcast Alerts ....................................................................................................................................... 63 5.3 Availability of WAAS Messages (CRE, CRW, and AMR) ..................................................................... 64 5.4 Satellite Glitches ....................................................................................................................................... 75 6.0 SV RANGE ACCURACY ............................................................................................................................... 77 7.0 GEO RANGING PERFORMANCE .............................................................................................................. 86 8.0 WAAS AIRPORT AVAILABILITY .............................................................................................................. 90 9.0 WAAS CODE NOISE AND MULTIPATH BOUNDING ANALYSIS ..................................................... 151 10.0 WAAS REFERENCE STATION (WRS) ANTENNA SURVEY VALIDATION ............................... 154 11.0 SIGNAL QUALITY MONITOR (SQM) ................................................................................................ 170 11.1 Alpha Metrics ......................................................................................................................................... 170 11.2 Type Bias ................................................................................................................................................ 170 11.3 PRN Bias ................................................................................................................................................ 173 11.4 SQM Trips .............................................................................................................................................. 184 Appendix A: Glossary and Acronyms ................................................................................................................... 185 Appendix B: Additional Coverage Plots ................................................................................................................ 189 Report 60 ii WAAS Performance Analysis Report April 2017 LIST OF FIGURES Figure 2-1 LPV 95% Horizontal Accuracy ................................................................................................................. 19 Figure 2-2 LPV 95% Horizontal Accuracy ................................................................................................................. 20 Figure 2-3 LPV 95% Horizontal Accuracy ................................................................................................................. 21 Figure 2-4 LPV 95% Vertical Accuracy ...................................................................................................................... 22 Figure 2-5 LPV 95% Vertical Accuracy ...................................................................................................................... 23 Figure 2-6 LPV 95% Vertical Accuracy ...................................................................................................................... 24 Figure 2-7 NPA 95% Horizontal Accuracy ................................................................................................................. 25 Figure 2-8 NPA 95% Horizontal Accuracy ................................................................................................................. 26 Figure 2-9 LPV Horizontal Error Bounding Triangle Chart ........................................................................................ 27 Figure 2-10 LPV Vertical Error Bounding Triangle Chart .......................................................................................... 28 Figure 2-11 LPV 2-D Horizontal Error Distribution Histogram ................................................................................. 29 Figure 2-12 LPV 2-D Vertical Error Distribution Histogram ...................................................................................... 30 Figure 3-1 LPV Instantaneous Availability ................................................................................................................. 38 Figure 3-2 LPV Instantaneous Availability ................................................................................................................. 39 Figure 3-3 LPV Instantaneous Availability ................................................................................................................. 40 Figure 3-4 LPV200 Instantaneous Availability ........................................................................................................... 41 Figure 3-5 LPV200 Instantaneous Availability ..........................................................................................................
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