metis first master training & seminar company: pole star sayerse philippe email:...

METIS First Master Training & Seminar

Company: Pole Star

Sayerse Philippe

email: [email protected]

EGNOS / GALILEO Receivers

METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007

GPS Receivers principles

EGNOS RECEIVERS

State of the art Products

GPS / Galileo receivers: What will change

Differences with GPS receivers (Hardware and software receivers) Designs (Hardware and software receivers) Products & Running projects

Tools and facilities

Conclusion

Agenda

The METIS project is managed by the European GNSS Supervisory Authority through Euro-MED GNSS I project


GNSS Signals reminder

RNSS Bands RNSS Bands

ARNS Bands ARNS Bands

SARE5a/L5 E5b E6 L1E2 E1

1164

MH

z

1214

MH

z

1260

MH

z

1300

MH

z

1176

.45

MH

z

1278

.75

MH

z

1544

MH

z15

45 M

Hz

1559

MH

z

1587

MH

z

1591

MH

z

1563

MH

z

1575

.42

MH

z

1215

MH

z

1237

MH

z

L2

1207

.140

MH

z

GALILEO Bands (Navigation)

GALILEO SAR Downlink

GPS Bands

1189

MH

z

OSCS

OSSoLCS

PRS PRSCS OSSoLCS

PRS PRS

Source: ESA


GPS Receivers Reminder: Classical Architecture

Pre-amplifier - filtering

Navigation filter

Channel 20

ADC

Local Oscillator

CAG

RF/ IF

Receiver processing

•Correlators

• Data and measures

Antenna

External assistance

Channel 3Channel 2

Channel 1

…


GPS Receivers Reminder: different characteristics

Globally, it exists three kind of GPS receiver architecture: Parallel Serial Multiplex

However, the differences between the existing ones consist generally in:

Number of correlators (up to 200000) Number of C/A Channels (up to 20) Dual or single frequency (depending on application) Navigation filter (software) Consumption


EGNOS Receivers principles

An EGNOS receiver is based on a classical GPS receiver and contains additional processing to track and monitor the EGNOS Geostationary satellites and decode the information broadcast on them (software additional functions)

EGNOS signal is in certification process for Civil Aviation and Safety critical purposes


EGNOS RECEIVERS: State of the art

Most of the GPS chipsets on the market are now compatible with WAAS / EGNOS signals

GEO Ranging (R-GEO): Transmission of GPS-like signals from three GEO satellites (Inmarsat-3 AOR-E, Inmarsat-3 IOR, and ESA’s Artemis satellite), augments the number of navigation satellites available to users.

GNSS Integrity Channel (GIC): Broadcasting of integrity information will increase the availability of the GPS/GLONASS/EGNOS safe-navigation service to the level required for civil-aviation non-precision.

Wide-Area Differential (WAD): Broadcasting of differential corrections will increase the GPS/GLONASS/EGNOS navigation service performance - mainly its accuracy - to the level required for precision approaches down to CAT-I landings.

Sysnet compatible receivers (internet data link)


EGNOS Receivers: Products

A list of available SBAS receivers is regularly uptdated by esa This list provides the name of the companies and products

(http://www.egnos-pro.esa.int, ESTB Help Desk: [email protected])


GALILEO Services / Signals

Source: ESA


Galileo RECEIVERS: Main differences with GPS receivers

Galileo has more carriers than GPS, larger bandwidth and new signal structures (codes, multiplexing and modulation)

Higher number of signals: increase of hardware complexity and processor load new

Different modulation and multiplexing schemes Signal Acquisition: Codes ~10x longer / Codes higher rate (BW) Signal Tracking: Bump jumping / Pilot (improved sensitivity) SW / HW Boundary: large number of channels / Higher data rates / Viterbi decoding /Deinterleaver, leads to very high burst

CPU load, complicates SW, multi-processor systems and/or dedicated HW required

The power of Galileo signals will be greater by a factor of 2, which will result in the reduction of tracking noise for both phase and code ranges. But the indoor positionning will still require very weak signals processing

Each Galileo signal includes a so-called “pilot”, data-less component, which can be easily acquired independently, without the decoding of data bits. Fatser acquisition in case of the loss-of-lock.

The novel modulation schemes will result in significant reduction of both tracking and multipath noise for all the code ranges.

A more robust 3-step coding scheme for navigation bits will be used (Viterbiencoding, CRC check, bit interleaving). This will significantly increase the reliability of navigation message decoding in the presence of interference or with low signal power.


Galileo Receivers: Designs

See p11 of SeptentrioGalileoReceviersGNSS2005.pdf (Generic architecture)

Front End

• Filtering

• Pre Amplifier

• Intermediary Frequency

Correlation Measure

Data Processing

Navigation

Antenna

HW or SW solutionsHW or SW solutions

HW solutionsHW solutions

SW solutionsSW solutions


Advanced Architectures

Measure Sharing (interactive networks) External precise time reception CEM: Receivers integrated in Mobile phones A-GNSS

Real Time processing HW acceleration or Buffers

RF Chip Correlation IC µP

• Shared processor

• Dedicated processor

• DSP

~

Clk

Data

Software Solutions or Integrated Chips

Advanced Features

External Data and signals


Receivers Standards

European Standardization activities

– for commercially available Galileo receiver equipment for the three main receiver categories (consumer, professional and safety of life)

– Official European Standardization Bodies CEN, CENELEC and ETSI

– Close coordination with EC, ESA and Eurocontrol, to ensure the proper dissemination of Galileo core Technical Standards

Already available: IMO (déc 2006) & ICAO Standards drafts


OS Signal case

Mono or Dual Frequency (Mass Market) Three frequency allowed (E5a&b, L1) Interoperability with GPS (L1- E5a/L5)

Receiver requirements:

– Low cost

– Interoperability with GPS

– Light indoor capacity (due to signal strength )


SoL Service case

No encryption Higher accuracy Dual or Tri frequency (security applications) Integrity (difference with OS Signal)

Receiver specificity:

– Integrity processing

– Redundancy in terms of frequency channels (E5)


CS Service Case

Charged service Data encryption & integrity Possible interoperability with GPS Dual, or Tri frequency receivers


– Encryption functions (E6)

– Additional data processing (commercial data, in E6)

– Possible integrity processing


PRS service case

Only used by governments Fully independent signal Data encryption No interoperability with GPS Dual frequency receivers


– Encryption functions

– Robustness


SAR service case

Using E5a/b, L1 signals plus Uplink channel (SAR Beacon) Added value:

– Faster emergency signal process (compared with COSPAS-SARTSAT existing solution)

– Acknowledge sent to the user Receivers Requirement:

– the terminal has to be equipped with one Galileo receiver and one SAR beacon.

– ACK sent to the user on E5a/b, L1 signal


What kind of Galileo signal available now

Signals available with GIOVA (L1+ E5, L1+E6) Test and demonstration purposes: Codes and Navigation data

still different from the Galileo fully operational System (structure and content)

Galileo Frequencies have been brought into use the 3rd March 2006 (first Galileo signal in space analysis)

Static receiver measures already available GPS / Galileo interoperability already demonstrated Tests within different environments in progress


Galileo Receivers: Products & Running Projects

Septentrio receivers for GIOVA Test:– GSTB_V2 Galileo Experimental Test Receiver (GETR) Available since 2004

– Galileo TUR (Test User Receiver) Under Development (GPS + Galileo)

GJU Projects:– GRDB (Galileo Receiver for Distress Beacon)

http://progeny.galileoprojects.eu/fileadmin/PROGENY_public/Galileo_Workshop_for_SMEs/Parallel_Session_1/Session_Technology_GRDB.pdf

– GGPhi ( Low Cost Galileo GPS Carrier Phase Receiver)

http://progeny.galileoprojects.eu/fileadmin/PROGENY_public/Galileo_Workshop_for_SMEs/Parallel_Session_1/Session_Technology_GGPhi.pdf

– GREHDA (GALILEO Software Receiver for High Dynamic Applications)

http://progeny.galileoprojects.eu/fileadmin/PROGENY_public/Galileo_Workshop_for_SMEs/Parallel_Session_1/Session_Technology_GREHDA.pdf

– SOPHA (Software Galileo receiver)

http://progeny.galileoprojects.eu/fileadmin/PROGENY_public/Galileo_Workshop_for_SMEs/Parallel_Session_1/Session_Technology_SOPHA.pdf

– HIGAPS (Highly Integrated Galileo/GPS Chipset) http://www.higaps.com/


Galileo Receivers: Products & Running Projects

GAMMA: Assisted Galileo/GPS/EGNOS Mass Market Receiver http://www.gamma-project.info

ARTUS: Advanced Receiver Terminal for User Services http://www.artus-gju.org/

GARDA / GIRASOLE: Galileo Integrity Receiver for Advanced Safety Of Life Equipment

GR POSTER: Galileo Ready Positioning Terminal http://www.st.com/stonline/galileo/index.htm

GREAT: Galileo REceiver for mAss market – Advanced technologies for Mass Market Receivers http://www.greatproject.org

SWIRLS: Development of a professional Galileo-GPS receiver http://www.swirls-gju.com/index.htm


Tools and Facilities

Galileo signal simulators Post Processing tools Receivers development Environment

Available documents on: http://progeny.galileoprojects.eu/51.0.html


Conclusion

Up to now, only one operational test receiver, used for GIOVA / GIOVB signal tests

Numerous receivers manufacturers have initiated Galileo receivers development, but no communication on it until the Galileo system entering into service phase

Receivers Standards in process of definition Seamless transition from GPS to GPS + GALILEO for the users /

application developers for OS services (mass market) Other applications (applying quality of services and/or integrity):

EGNOS is already available. The emergence of Galileo will reinforce the performances (GPS + Galileo) and allow signal warranty services (Galileo /Egnos)


THANK YOU !

metis first master training & seminar company: pole star sayerse philippe email:...

Documents

gps receivers hardware

esagalileo receivers

software receivers products

esagps receivers reminder

gps receiversgalileo

transmission of gps

gps chipsets

classical gps receiver