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Wide Area Augmentation System

Wide Area Augmentation System. Dan Hanlon WAAS Program Manager April 2, 2003. What is WAAS?. WAAS Consists of: 25 Reference Stations 2 Master Stations 2 Geosynchronous Satellites 3 Uplink Stations.

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Wide Area Augmentation System

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  1. Wide Area Augmentation System Dan Hanlon WAAS Program Manager April 2, 2003

  2. What is WAAS? • WAAS Consists of: • 25 Reference Stations • 2 Master Stations • 2 Geosynchronous Satellites • 3 Uplink Stations • WAAS Augments The GPS Constellation To Meet The Necessary Integrity, Availability, Accuracy, And Continuity For Use In All Phases Of Flight.

  3. How Does It Work?

  4. WAAS Components

  5. WAAS Benefits • Safety • Vertical Guidance Available For All Runways Ends (CFIT) • Situational Awareness (Air and Ground) • Low Altitude Routes • Protection From Icing • Positive Guidance In Obstacle Rich Terrain

  6. Benefits cont. • Cost Savings • Low Cost/High Capability Avionics Available to All Users • Reduction of Redundant Ground Based Navigation Aids

  7. Benefits cont. • Efficiency • Precision Approach • Back Up For All Current ILS Approaches (250/¾) • Usable With Advanced Procedures • WAAS RNP Can Provide Lower Minima At Airport LNAV/VNAV 350’ LPV 250’ ILS 200’ 3o

  8. Benefits cont. • Efficiency • Provides High End Navigation Capability To All Users • Advanced Arrival & Departure Procedures • Mitigate Impact on Noise & Environmentally Sensitive Areas • Develop Non Interfering Arrival/Departure Routes in Class B and Other Airspace

  9. WAAS Availability

  10. Procedures • All GPS Stand-Alone Procedures are being Converted to Area Navigation (RNAV) Procedures • Plan to have WAAS GPS Approaches to all Suitable IFR Runway Ends • Provide Vertical Guidance • Lower Minima? • Develop ~300/yr Until 2009 • Plan to use WAAS GPS Approaches for Future Copter Approaches to Heliports • Expect Considerable Improvement in Lower Minima

  11. Procedures cont. • Approaches • 524 Published LNAV/VNAV Approaches (3/6/03) • Expect to Have 700 LNAV/VNAV Procedures Available at WAAS Commissioning • Plan to Publish the First LPV Approaches by 9/03 • Publish Approximately 300 LPV Approaches per Year • Continue to Publish LNAV/VNAV Procedures

  12. WAAS Avionics • Certified Receivers • UPS/AT • Chelton Systems • Others in Development • Capstone (Alaska) • SFAR Approved (Mar 03) • Currently Equipping Aircraft with WAAS Avionics • Able to Use WAAS Upon WAAS Commissioning UPS/AT WAAS Sensor Chelton Receiver Capstone Installation

  13. WAAS Receiver Functional Classes • Beta • Sensor Only. Does Not Have Navigation Function • Generates Position, Velocity, Time, With Integrity • Typically Provides PVT To An FMS Which Provides Navigation Function • Gamma • Typical Panel Mount Receiver • Beta Sensor Plus Navigation Function With Procedure Database And User Controls • Delta • Beta Sensor With Navigation Function That Provides Deviations To A Final Approach Segment Only • Functions Like ILS (E.G., Does Not Support En Route Navigation)

  14. Sensor (Beta) Navigation Computer Antenna Database Controls WAAS Class Beta Configuration Alerts Deviations Position Displays Autopilot Deviations Steering Integrity

  15. Displays Autopilot Navigation Computer Antenna Database Controls WAAS Class Gamma Configuration Alerts Deviations Position Sensor (Beta) Integrity Deviations Steering

  16. Displays Autopilot Antenna Database Controls WAAS Class Delta Configuration Alerts Deviations Position Sensor (Beta) Navigation Computer Integrity Deviations Steering

  17. WAAS Operational (LNAV/VNAV) 95% of U.S. Portions of Alaska 350’ Minimum WAAS Operational (LPV) 250’ Minimums WAAS Full Operating Capability Full Continental U.S. Most of Alaska 250’ Minimum GPS L5 WAAS 200’ Minimums Interference Mitigation July 2003 September 2003 2006 ~ 2013 WAAS Schedule Goal

  18. Summary • WAAS Operating Continuously Since August 2000 And In Use By Over 1 Million Non-aviation Users • Certified Avionics Are Available Now • WAAS Procedures Are In Place And Will Continue To Be Developed • WAAS Will Be Commissioned For Use in the National Airspace In July 2003

  19. FAA GPS Product TeamWebsite • For further information on the FAA’s Satellite Navigation Program, please visit our website at: http://gps.faa.gov

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