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WAAS PAN Report (January 2021) Satellite Navigation Branch, ANG-E66 NSTB/WAAS T&E Team WIDE AREA AUGMENTATION SYSTEM PERFORMANCE ANALYSIS REPORT January 2021 Report #75 Reporting Period: October 01 to December 31, 2020 http://www.nstb.tc.faa.gov FAA William J. Hughes Technical Center Atlantic City International Airport, NJ 08405 WAAS Performance Analysis Report January 2021 DOCUMENT VERSION CONTROL VERSION DESCRIPTION OF CHANGE DATE 0.1 Initial Version of Document 01/27/2021 0.2 Technical Edit 01/28/2021 0.3 Peer Review 02/05/2021 1.0 Final Report 02/10/2021 Report 75 ii WAAS Performance Analysis Report January 2021 Executive Summary Since 1999, the Wide Area Augmentation System (WAAS) Test Team at the FAA William J. Hughes Technical Center has reported 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 #75 provides WAAS performance data from the October 01 through December 31, 2020 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 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—Atlantic City, New Jersey, and Arcata, California—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 Arcata Dallas Juneau Fairbanks (HPL <= 40 meters) 1.323 meters 0.548 meters 0.692 meters 0.534 meters 95% Vertical Accuracy Miami Salt Lake City Cold Bay Kotzebue (VPL <= 50 meters) 1.592 meters 0.751 meters 1.192 meters 1.011 meters LP Availability All Sites All Sites All Sites All Sites (HPL <= 40 meters) 100% 100% 100% 100% LPV Availability Multiple Sites Miami All Sites All Sites (HPL <= 40 meters & 100% 99.99% 100% 100% VPL <= 50 meters) LPV200 Availability Multiple Sites Miami Multiple Sites Barrow (HPL <= 40 meters & 100% 99.94% 100% 99.77% VPL <= 35 meters) Cleveland Denver Cold Bay Juneau 99% HPL 15.466 meters 10.829 meters 20.249 meters 12.979 meters Arcata Billings Barrow Juneau 99% VPL 29.612 meters 20.072 meters 31.980 meters 21.149 meters Report 75 iii WAAS Performance Analysis Report January 2021 TABLE OF CONTENTS 1.0 INTRODUCTION .......................................................................................................................... 1 1.1 Event Summary ........................................................................................................................... 4 1.2 Report Overview ....................................................................................................................... 17 2.0 WAAS POSITION ACCURACY ............................................................................................... 18 3.0 AVAILABILITY .......................................................................................................................... 33 4.0 COVERAGE ................................................................................................................................. 51 5.0 INTEGRITY ................................................................................................................................. 62 5.1 HMI Analysis ............................................................................................................................ 62 5.2 Broadcast Alerts ........................................................................................................................ 63 5.3 Availability of WAAS Messages (SM9, S15, and CRE) ........................................................... 64 5.4 Satellite Glitches ........................................................................................................................ 73 6.0 SV RANGE ACCURACY ........................................................................................................... 75 7.0 GEO RANGING PERFORMANCE .......................................................................................... 86 8.0 WAAS AIRPORT AVAILABILITY .......................................................................................... 88 9.0 WAAS CNMP BOUNDING ANALYSIS ................................................................................. 161 10.0 WRS ANTENNA SURVEY VALIDATION ............................................................................ 164 11.0 SQM ............................................................................................................................................. 179 11.1 Alpha Metrics .......................................................................................................................... 180 11.2 Type Bias ................................................................................................................................. 180 11.3 PRN Bias ................................................................................................................................. 181 11.4 SQM Trips ............................................................................................................................... 191 Appendix A: Glossary and Acronyms .................................................................................................... 192 Appendix B: Additional Coverage Plots ................................................................................................. 196 Report 75 iv WAAS Performance Analysis Report January 2021 LIST OF FIGURES Figure 2-1 LPV 95% Horizontal Accuracy ................................................................................................................. 22 Figure 2-2 LPV 95% Horizontal Accuracy ................................................................................................................. 23 Figure 2-3 LPV 95% Horizontal Accuracy ................................................................................................................. 24 Figure 2-4 LPV 95% Vertical Accuracy ...................................................................................................................... 25 Figure 2-5 LPV 95% Vertical Accuracy ...................................................................................................................... 26 Figure 2-6 LPV 95% Vertical Accuracy ...................................................................................................................... 27 Figure 2-7 NPA 95% Horizontal Accuracy ................................................................................................................. 28 Figure 2-8 NPA 95% Horizontal Accuracy ................................................................................................................. 29 Figure 2-9 LPV Horizontal Error Bounding Triangle Chart ........................................................................................ 30 Figure 2-10 LPV Vertical Error Bounding Triangle Chart .......................................................................................... 31 Figure 2-11 LPV 2-D Horizontal Error Distribution Histogram ................................................................................. 32 Figure 2-12 LPV 2-D Vertical Error Distribution Histogram ...................................................................................... 33 Figure 3-1 LPV Instantaneous Availability ................................................................................................................. 37 Figure 3-2 LPV Instantaneous Availability ................................................................................................................. 38 Figure 3-3 LPV Instantaneous Availability ................................................................................................................. 39 Figure 3-4 LPV200 Instantaneous Availability ........................................................................................................... 40 Figure 3-5 LPV200 Instantaneous Availability ........................................................................................................... 41 Figure 3-6 LPV200 Instantaneous Availability ........................................................................................................... 42 Figure 3-7 LPV Outages .............................................................................................................................................. 43 Figure 3-8 LPV Outages .............................................................................................................................................
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