Federal AviationAdministration

GPS Augmentation Systems Status

Leo Eldredge, GNSS GroupFederal Aviation Administration (FAA)September 2009

CGSIC1Federal Aviation

AdministrationSeptember 2009

FAA GPS Augmentation Programs

CGSIC2Federal Aviation

AdministrationSeptember 2009

WAAS Architecture

38 Reference Stations

3 Master Stations

4 Ground Earth Stations

2 Geostationary Satellite Links

2 Operational Control Centers

CGSIC3Federal Aviation

AdministrationSeptember 2009

IntelsatGXV133W

TelesatF1R

107W

Inmarsat4F3 98W

GEO Satellite Coverage Plot

Localizer Performance Vertical (LPV)

Global SBAS Coverage

CGSIC6Federal Aviation

AdministrationSeptember 2009

Airports with WAAS Supported Instrument Approaches with Vertical Guidance

As of Aug 27th, 2009-1,822 LPVs serving 970 Airports- 1049 LPVs to non ILS Runways - LPVs to 678 non-ILS Airports - 773 LPVs to ILS runways

WAAS Enterprise Schedule04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30FY

Development Operational

Technical Refresh OperationalJRC

Launch10/05

Operational

Operational

Launch9/05

Technical Refresh Operational

JRC

FOC

Launch09/08

Operational

Launch09/14

Operational

Launch09/16

Operational

Launch09/18

Operational

FLP Segment (Phase II)

LPV-200 Segment (Phase III)

Dual Frequency (Phase IV)

GEO #3 – Intelsat

GEO #4 – TeleSat Gap

Filler GEO

GEO #5 – TBD

GEO #6 – TBD

GEO #7 - TBD

Initial TestProduction

FOC

SLEP

Phase III Phase IVCutover

Operational SLEP

Standards Development User Transition Period

L5 Design L5 Implementation

GPS L5

WAAS

WAAS Avionics

Phas

esG

EOG

PS

Mod

erni

zatio

nA

ppro

ach

Dev

elop

men

t

WAAS Procedure Development

~5,218

CGSIC8Federal Aviation

AdministrationSeptember 2009

Local Area Augmentation System (LAAS)

• Precision Approach For CAT- I, II, III

• Multiple Runway Coverage At An Airport

• 3D RNP Procedures (RTA), CDAs

• Navigation for Closely Spaced Parallels

• Super Density Operations

CGSIC9Federal Aviation

AdministrationSeptember 2009

GBAS Pathway Forward

• Cat-I System Design Approval at Memphis – Complete• Cat-III Validation by - 2010• Cat-III Final Investment Decision by - 2012

CGSIC10Federal Aviation

AdministrationSeptember 2009

Agana, Guam

Frankfurt, Germany

Rio De Janeiro, Brazil

Malaga, Spain

Sydney, Australia

Bremen, Germany

LAAS/GBAS International Efforts

CGSIC11Federal Aviation

AdministrationSeptember 2009 11

Future Considerations

GLONASS

GPS

Galileo (EU)

COMPASS

CGSIC12Federal Aviation

AdministrationSeptember 2009 12

Two Civil Frequencies

• The ionosphere creates the largest source of uncertainty affecting today’s use of GPS for aviation

• When GPS L5 becomes widely available it will be possible for the user receivers to directly remove the ionosphere delay errors

• However, the two frequency combination amplifies the effects of other error sources– More satellites tend to reduce the magnitude of the

errors

CGSIC13Federal Aviation

AdministrationSeptember 2009

WAAS Dual Frequency User Potential(No “RDM Constraint”)

38 US WRS13 SA WRSIFOR Threshold

38 US WRSIFOR Threshold

Current International Signal Plans

14

FutureCDMA signal

SBAS(US Europe

India Japan)

QZSS(Japan)

IRNSS(India)

COMPASS(China)

Galileo(Europe)

GLONASS(Russia)

GPS(US)

L1L5 L2

Compass & IRNSSIn S-band

1560 1570 1580 1590 1600 16101170 1180 1190 1200 1210 1220 1230 1240 1250 1260 1270 1280 1290 1300 Frequency (MHz)

CGSIC15Federal Aviation

AdministrationSeptember 2009

ARAIM Results for 30 SVs & URA = .5 m

For VAL = 35m, NDP & Acc: 97.77% coverage at 99.5% availabilit< 50% > 50% > 75% > 85% > 90% > 95% > 99% >99.5% >99.9%

Longitude (deg)

Latit

ude

(deg

)

URA = 0.5m, Bias = 0.5m, URE = 0.25m, rBias = 0.1m

-150 -100 -50 0 50 100 150

-80

-60

-40

-20

0

20

40

60

80

99.5% VPL - 20.46 m avg., 35m avail = 99.99%< 15 < 20 < 25 < 30 < 35 < 40 < 45 < 50 > 50

Longitude (deg)

URA = 0.5m, Bias = 0.5m

Latit

ude

(deg

)

-150 -100 -50 0 50 100 150

-80

-60

-40

-20

0

20

40

60

80

ARAIM currently predicated upon a user update rate of ~ 1hour

CGSIC16Federal Aviation

AdministrationSeptember 2009

Summary

• WAAS currently providing service to aviation in the U.S. National Airspace System

• LAAS system design approval for Category-I completing in September

• LAAS activity to continue to Category-II/III • Dual Frequency GNSS Offers Significant Potential

for Aviation