metis first master training & seminar company: pole star sayerse philippe email:...
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Page 1
METIS First Master Training & Seminar
Company: Pole Star
Sayerse Philippe
email: [email protected]
EGNOS / GALILEO Receivers
Page 2 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
Page 3 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
Page 4 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
…
Page 5 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
Page 6 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
Page 7 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 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)
Page 8 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])
Page 9 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
GALILEO Services / Signals
Source: ESA
Page 10 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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.
Page 11 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
Page 12 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
Page 13 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
Page 14 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 )
Page 15 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)
Page 16 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
Page 17 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
PRS service case
Only used by governments Fully independent signal Data encryption No interoperability with GPS Dual frequency receivers
Receiver requirements:
– Encryption functions
– Robustness
Page 18 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 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
Page 19 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
Page 20 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) http://www.higaps.com/
Page 21 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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
Page 22 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
Page 23 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
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)
Page 24 METIS First Master Training & Seminar, Ifrane (Morocco), 15-16.03.2007
THANK YOU !