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• GBAS CAT-III Research & Development Activities
• GBAS – JPALS
Federal Aviation 3
Administration
GPS World 10/02/06
• Boeing
– “Boeing’s early operational experience with GBAS has
generally been excellent. As we begin use of GBAS in daily
airline operations it is important for airspace managers, airline
operational planners and navigation service providers to
understand the potential new or improved capabilities enabled
by GBAS, as well as its potential for cost reduction for existing
airspace system infrastructure
– Boeing and Airbus will introduce GLS into their product lines
Federal Aviation 4
Administration
Air Carrier Support For GBAS
• Many US Air Carriers Strongly Support LAAS
• LAAS Viewed as True International Precision
Landing Navigation System
• Boeing/AIRBUS
•Boeing achieved GLS Certification 2006
•Airbus Planning on GLS Certification 2007
• Air Carriers
• FedEx strong partner in implementing GBAS in Memphis
• Continental leading GBAS implementation for their B737 NG aircraft in Guam
• Qantas leading GBAS implementation with B 737 NG aircraft in Sydney
• Hapag-Fly with DFS in Germany
Federal Aviation 5
Administration
LAAS Capabilities
• The Local Area Augmentation System (LAAS)
Represents the U.S. Approach to the International
Goal of an Interoperable GBAS Capability
• LAAS Provides a Navigation Signal That Supports
the Most Demanding RNP Requirements
• LAAS is complementary to SBAS
• One LAAS Can Cover the Entire Terminal Area and
Enables Precision Guidance
– Precision approach for Category I, II & III
– Multiple runway coverage
– Complex procedures Guided missed approaches and
departure procedures
– Aircraft surface navigation
Federal Aviation 6
Administration
Multiple Approach Capability of GBAS
70,000 square mile
service volume
could include
other nearby airports
Similar set of reciprocal
way-points can define
missed-approach,
go-around procedures,
SIDs and STARs
VDB transmission include
• Differential GPS corrections
• Final approach segment (FAS)
• Way-point data listing blocks
• Ground station and approach ID
Omni-directional VDB
Radiates out to 150 miles
(line of site)
Pilot selects one
of several
“approved” approaches
Control codes select
VHF frequency and
approach listing
blocks of way-points
21340
25016
30156
38254
49502
LAAS
GPS RX VHF TX
Angled Approach
Straight Approach
Sectored Approach
Parallel Approach
Curved Approach
Federal Aviation 7
Administration
LAAS Architecture
GPS
Antenna
Base Station
Computes
Differential
Corrections,
Provides
Integrity
Check &
Provides
Approach
Coordinates
Broadcast Information
Differential Corrections,
Integrity Status and
Approach Coordinates
Transmitter
Encoder
DATALINK
Federal Aviation 8
Administration
Siting Benefits of LAAS
• Reduced siting constraints
– Increase in potential sites over terrestrial NAVAIDS.
– LGF not fixed by function.
– Minimization of critical areas/operational impact.
– Flexibility in placement of critical hardware.
– Various configuration possible depending on operational needs.
• Reduced ground installation costs
– Reduced site preparation costs over terrestrial NAVAIDS
• Multiple runway service
– Single LAAS covers multiple runways
– Positive guidance in all/any missed approach regions
– Advanced procedures
– Variable glide paths
– Offset threshhold
– Enable:
• Surface navigation in the terminal area
• Some level of service at adjacent airports
Federal Aviation 9
Administration
Program Background
• Program Baseline Completed in 1999
• Established Government Industry Partnership (GIP) For
Category-I Development in 1999
• GIP Experienced Delays Due to Integrity Issues
• In 2001, Strategy Changed To FAA Full Scale Development
Contract for Category- I LAAS
• Contract Awarded To Honeywell In April 2003
– Aggressive Schedule and Integrity Issues Resulted In Delays
• FAA Directed Program Back To R&D In February 2004
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