european gnss

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EUROPEAN GNSS

EGNOS AND GALILEO. CHARACTERISTICS AND ADVANTAGES OF

BRUSSELS. OCTOBER 1st, 2010

© GMV, 201001/10/2010

CONTENTS

GNSS context and the European Strategy

EGNOS system and services

Galileo system and services

Conclusions

EGNOS and Galileo. Characteristics and advantages of European GNSS

© GMV, 201001/10/2010

GNSS CONTEXT

Society, and very specially Europe, depends today very much on GNSS:

Obvious for average people: Car navigators, LBS in mobiles… Not so obvious (and more critical): communications network,

electrical power supply, economical transactions, transport network (buses, trains…), air navigation, road user charging…

Unavailability of GPS can have a very major impact in society, although risk today is extremely small from both technical (more than 20 years of continuous operation) and political reasons (USA commitment + commercial interest)

GPS is a very powerful tool for navigation but not enough for civil aviation (very demanding safety and reliability requirements not fulfilled by GPS)


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EUROPEAN GNSS STRATEGY

In that context, Europe could not remain passive in front of such a strong economical and technological asset and has taken major efforts to develop and operate:

Step 1: EGNOS to provide civil andsafe complement to GPS. Operational since 1/10/09

Step 2: Galileo is to achieveEuropean sovereignty through

dedicated system undercivil control


© GMV, 201001/10/2010

WHAT EGNOS IS

Complement to GPS (and GLONASS) to improve overall performances of GPS in Europe and make them compatible with highly demanding Civil Aviation Requirements

Signal GPS-like transmitted from geostationary satellites including corrections to GPS and additional integrity information

EGNOS Receivers very similar to GPS ones (thanks to signal similarity). Most of GPS receivers today can receive/process EGNOS signals


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EGNOS: THE EUROPEAN SBAS

EGNOS is the European implementation of SBAS (CA standard) systems. Interoperability ensures that receivers work in any other SBAS


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EGNOS ARCHITECTURE (I)


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EGNOS ARCHITECTURE (II)


MON

EDBDJB

HBK

NOU

CNR

MDR

AZR

LSB

WRS

MLG

SDC

PDM

TLS

CAT

CIA

UTCZCH

SOF

BRN

RKK

GOL

ALB

GVLLAP

TRD

TRO KIR

CRK

GLG

SWK

EGL

LGN

TOR

SCZ

AUS

GON

FUC

KOU

BANBAN

• 47 EGNOS elements deployed onto 41 sites in 22 countries

• 34xRIMS, 4xMCC, 6xNLES, 3xGEO

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WHAT EGNOS PROVIDES TO USERS

Within European Coverage, users (no subject to major local errors) will have:

Improved Horizontal and Vertical Accuracy (as compared to GPS).

Position Integrity: Provides a bounding of the position errors. This is key for Civil Aviation and the main “differenciator” of EGNOS w.r.t. GPS

Continuity and Availability of the service


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ACCURACY VS. INTEGRITY


Integrity concept introduced by civil aviation for those performance affecting safety. E.g. for a safe landing it is not enough that errors are small in average (accuracy); it requires that errors are small all along every landing (integrity).

For events for which probability has to be very low, integrity (not accuracy) is the relevant parameter:

Landing accident Knife out of the

target Wrong detection

of zones in RUC

High accuracy does not necessarily imply high integrity.

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EGNOS A REALITY TODAY

EGNOS in full operation since 1/10/09

Certified service in the very near future

Large track of improved performances demonstrated in the last years (EGNOS signal started in 2005)

Different users already exploiting the EGNOS service


© GMV, 201001/10/2010

GALILEO INTRODUCTION

Galileo is the second step of the European infrastructure providing a fully autonomous navigation system

System “similar” to GPS but with improved performances and additional services

Unlike GPS, specially designed for civil use and under civil control

Currently under development

Two satellites already on orbit


© GMV, 201001/10/2010

WHAT GALILEO PROVIDES TO USERS

As standalone system (see next slide)

In combination with GPS: more satellites in direct vision (major advantage for users specially in urban environments)

Worldwide coverage


GPSGPS GalileoGalileo

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WHAT GALILEO PROVIDES


Open Service

Commercial

Safety of Life

Search and Rescue

Free to air; Mass market; Simple

positioning and timing. Encrypted; High

accuracy; Guaranteed service

Open Service + Integrity signal

Encrypted; Integrity; Continuous availability

Near real-time; Precise; Return link feasible

Public Regulated

Navigation

SAR

© GMV, 201001/10/2010

CONCLUSION

Huge European efforts to provide an advanced GNSS infrastructure in two steps:

1st step (EGNOS)

Already operational Substantial performance improvement over Europe Receivers similar to GPS already in the market Free of charge

2nd step (Galileo)

Provides European independence Improved performances and additional services worldwide Developed to allow interoperability with GPS: combined use

GPS+Galileo of substantial advantage to users


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