1. CAR/SAM ATN GNSS SEMINAR VARADERO, CUBA May 8, 2002
Presentation GNSS 3.2
CAR/SAM ATN GNSS SEMINAR VARADERO, CUBA May 8, 2002
Barry Billmann Federal Aviation Administration

2. OVERVIEW CORE SATELLITE SYSTEM WAAS/LAAS INTEGRATION
LAAS SYSTEM COMPONENTS
LAAS USER/SERVICE PROVIDER PERSPECTIVES
LAAS AVIONICS
MULTI-PATH LIMITING ANTENNA (MLA)
GOVERNMENT INDUSTRY PROCUREMENT (GIP)
FAA LAAS DEVELOPMENT CONTRACT

3. SVs Orbit at approximately 20 million meters above the earth
Space Segment
24 Satellites
6 Orbital Planes
4 Satellites per Plane
SVs Orbit at approximately 20
million meters above the earth
Each SV Orbits the earth twice a day
Ground Control Segment
Master Control Station, Colorado Springs
Monitor Stations; Hawaii, Ascension Island, Diego Garcia, and Kwajalein

4. WAAS/LAAS INTEGRATION

5. Local Area Augmentation System

6. Local Area Augmentation of GPS
Protection Level=10 m CAT I
5.3 m CAT II/III
4 Meter Accuracy
Category I
2 Meters Accuracy
Category II/III
Ground Processor
Ground Data Radio
Data Link Radio

7. Architecture Considerations Service Provider Perspective
Minimize Number of Ground Components
Lower maintenance requirements
Collocate Individual System Components as Much as Possible
All Equipment on Airport Property
One LAAS Serves all Runway Ends
Minimize Siting Constraints
Clear areas required around components
Antenna installation requirements

8. Architecture Considerations User Perspective
Instrument Landing System (ILS) Look Alike
Accuracy (Performance Characteristics)
Integrity (Sustain Traditional Responsibility of Service Provider)
Minimal Change to Flight Director/Autopilot
No Change to Aircraft Approval Process
Reasonable Processing Requirements on Aircraft
Minimize Number of LAAS-Dedicated Antennas (e.g., Use Existing VHF Antenna to Receive LAAS Data Broadcast)

9. LAAS (GBAS) AVIONICS
MULTI-MODE RECEIVER (MMR) – DESIGNED TO MEET ICAO LANDING SYSTEM TRANSITION STRATEGY OF 1995
CORE FUNCTION – FM IMMUNITY COMPLIANT ILS SENSOR
MLS SENSOR OPTION
GLOBAL LANDING SYSTEM (GLS) SENSOR
GBAS (LAAS) ILS Look Alike Guidance
WAAS Option
Position, Velocity, Time Output to On Board Navigator

10. Multipath Limiting Antenna (MLA)

11. Multipath Limiting Antenna (MLA)
The multipath error magnitude is directly proportional the ratio of the direct signal strength to the reflected or multipath signal strength.
If the ratio can be limited, the corresponding error is also limited.

12. FAA Government Industry Partnership (GIP)
Government Industry Partnership (GIP) initiated to assist all companies developing LAAS obtain FAA Type Acceptance
GIP teams are led by ground systems manufacturers, but also require:
Avionics Manufacturer
Airport
Airline
FAA currently has three GIP teams
Honeywell
Raytheon
Thales
FAA introduced a series of payable events to allow vendor building to the FAA CAT I Specification obtain some funding

13. FAA Development Contract
FAA intends to award a Full Scale Development contract for LAAS this year
Detailed requirements and schedule have been released for industry comment
Two separate Request For Information (RFI) announcements provided feedback to the FAA
August 31, 2001 and January
Request for Offers (RFO) is due out this month
Full and Open Competition
Information available on the FAA Contracting Opportunities Website: