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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

Wide Area Augmentation System

Dan Hanlon

WAAS Program Manager

April 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.
waas benefits
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
Benefits cont.
  • Cost Savings
    • Low Cost/High Capability Avionics Available to All Users
    • Reduction of Redundant Ground Based Navigation Aids
benefits cont7
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

benefits cont8
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
procedures
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
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
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

waas receiver functional classes
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)
waas class beta configuration

Sensor

(Beta)

Navigation

Computer

Antenna

Database

Controls

WAAS Class Beta Configuration

Alerts

Deviations

Position

Displays

Autopilot

Deviations

Steering

Integrity

waas class gamma configuration

Displays

Autopilot

Navigation

Computer

Antenna

Database

Controls

WAAS Class Gamma Configuration

Alerts

Deviations

Position

Sensor

(Beta)

Integrity

Deviations

Steering

waas class delta configuration

Displays

Autopilot

Antenna

Database

Controls

WAAS Class Delta Configuration

Alerts

Deviations

Position

Sensor

(Beta)

Navigation

Computer

Integrity

Deviations

Steering

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 2003

2006

~ 2013

WAAS Schedule Goal
summary
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
faa gps product team website
FAA GPS Product TeamWebsite
  • For further information on the FAA’s Satellite Navigation Program, please visit our website at:

http://gps.faa.gov