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Wide Area Augmentation SystemWide Area Augmentation System
Dan Hanlon
WAAS Program ManagerApril 2, 2003
What is WAAS?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?How Does It Work?
WAAS Components WAAS Components
WAAS BenefitsWAAS 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.Benefits cont.
• Cost Savings– Low Cost/High Capability Avionics Available to All
Users– Reduction of Redundant Ground Based Navigation
Aids
Benefits cont.Benefits cont.
• Efficiency– Precision Approach
• Back Up For All Current ILS Approaches (250/¾)
• Usable With Advanced Procedures
LNAV/VNAV350’
LPV 250’
ILS 200’
3o
Example Curved Approach withContinuous Descent
© 2002 The MITRE Corporation. All RightsReserved.
• WAAS RNP Can Provide Lower Minima At Airport
Benefits cont.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 AvailabilityWAAS Availability
ProceduresProcedures
• 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.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 AvionicsWAAS Avionics
• Certified Receivers – UPS/AT– Chelton Systems– Others in Development
• Capstone (Alaska)– SFAR Approved (Mar
03)– Currently Equipping
Aircraft with WAAS AvionicsAble to Use WAAS Upon WAAS Commissioning
Capstone Installation
UPS/AT WAAS Sensor
Chelton Receiver
WAAS Receiver Functional ClassesWAAS 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)
NavigationComputer
Database
Controls
Position
Integrity
AlertsDeviations
DeviationsSteering
Displays
Autopilot
WAAS Class Beta ConfigurationWAAS Class Beta Configuration
Antenna Sensor(Beta)
NavigationComputer
Database
Controls
Position
Integrity
AlertsDeviations
DeviationsSteering
Displays
Autopilot
WAAS Class Gamma ConfigurationWAAS Class Gamma Configuration
Antenna Sensor(Beta)
Position
Integrity
AlertsDeviations
DeviationsSteering
Displays
Autopilot
ControlsDatabase
NavigationComputer
WAAS Class Delta ConfigurationWAAS Class Delta Configuration
WAAS Schedule GoalWAAS 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 2003
2006
~ 2013
SummarySummary
• 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
FAA GPS Product TeamWebsiteFAA 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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