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 WAAS Augments The GPS Constellation To Meet The Necessary Integrity, Availability, Accuracy, And Continuity For Use In All Phases Of Flight.

How Does It Work?

WAAS Components

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

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

Benefits cont. Efficiency –Precision Approach Back Up For All Current ILS Approaches (250/¾) Usable With Advanced Procedures LNAV/VNAV 350’ LPV 250’ ILS 200’ 3o3o WAAS RNP Can Provide Lower Minima At Airport

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

WAAS Availability

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

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

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 Capstone Installation UPS/AT WAAS Sensor Chelton Receiver

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)

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

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

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

WAAS Schedule Goal 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 ~ 2013

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

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