Transcript METIS First Master Training & Seminar EGNOS / GALILEO Receivers

METIS First Master Training & Seminar
EGNOS / GALILEO Receivers
Company: Pole Star
Sayerse Philippe
email: [email protected]
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Agenda
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
The METIS project is managed by the European GNSS Supervisory
Authority through Euro-MED GNSS I project
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
GNSS Signals reminder
ARNS Bands
ARNS Bands
RNSS Bands
E5a/L5
E5b
OS
SoL
CS
OS
CS
L2
RNSS Bands
E6
PRS CS PRS
SAR
E2
L1
PRS
OS
SoL
CS
E1
PRS
GALILEO Bands (Navigation)
GALILEO SAR Downlink
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GPS Bands
Source: ESA
METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
GPS Receivers Reminder: Classical
Architecture
Antenna
CA
G
Pre-amplifier filtering
RF/ IF
ADC
Channel
20
…
Channel 3
Channel 2
Channel 1
Local
Oscillator
External
assistance
Navigation
filter
Receiver
processing
•Correlators
• Data and
measures
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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 safenavigation service to the level required for civil-aviation nonprecision.
 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)
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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])
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
GALILEO Services / Signals
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Source: ESA
METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Galileo RECEIVERS: Main differences with GPS receivers
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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.
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Galileo Receivers: Designs
 See p11 of SeptentrioGalileoReceviersGNSS2005.pdf
(Generic architecture)
Antenna
Front End
Correlation
Measure
Data
Processing
• Filtering
• Pre Amplifier
Navigation
• Intermediary
Frequency
HW solutions
HW or SW solutions
SW solutions
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Advanced Architectures
 Real Time processing
 HW acceleration or Buffers
Software Solutions or Integrated Chips
Clk
RF Chip
Correlation IC
Data
µP
• Shared
processor
~
• Dedicated
processor
• DSP
Advanced Features
 Measure Sharing (interactive networks)
 External precise time reception
External Data and signals
 CEM: Receivers integrated in Mobile phones
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 A-GNSS
METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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 )
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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)
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
CS Service Case
 Charged service
 Data encryption & integrity
 Possible interoperability with GPS
 Dual, or Tri frequency receivers
 Receiver requirements:
– Encryption functions (E6)
– Additional data processing (commercial data, in E6)
– Possible integrity processing
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
PRS service case
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Only used by governments
Fully independent signal
Data encryption
No interoperability with GPS
Dual frequency receivers
 Receiver requirements:
– Encryption functions
– Robustness
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
SAR service case
 Using E5a/b, L1 signals plus Uplink channel (SAR Beacon)
 Added value:
– Faster emergency signal process (compared with COSPASSARTSAT 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
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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)
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http://www.higaps.com/
METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Galileo Receivers: Products &
Running Projects
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GAMMA: Assisted Galileo/GPS/EGNOS Mass Market Receiver
http://www.gamma-project.info
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ARTUS: Advanced Receiver Terminal for User Services
http://www.artus-gju.org/
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GARDA / GIRASOLE: Galileo Integrity Receiver for Advanced Safety Of
Life Equipment
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GR POSTER: Galileo Ready Positioning Terminal
http://www.st.com/stonline/galileo/index.htm
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GREAT: Galileo REceiver for mAss market – Advanced technologies
for Mass Market Receivers
http://www.greatproject.org
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SWIRLS: Development of a professional Galileo-GPS receiver
http://www.swirls-gju.com/index.htm
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Tools and Facilities
 Galileo signal simulators
 Post Processing tools
 Receivers development Environment
 Available documents on:
http://progeny.galileoprojects.eu/51.0.html
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
Conclusion
 Up to now, only one operational test receiver, used for GIOVA /
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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)
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
THANK YOU !
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METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007