1 / 38

Galileo and GLONASS

Galileo and GLONASS. Spirent Federal Systems Training Seminar 2007 Jonathan Hooper. Agenda. Galileo Background and Status Galileo Testing Galileo + GPS GLONASS Background and Status GLONASS Testing. Galileo. A Global Navigation System from Europe.

clarissa-verne
Download Presentation

Galileo and GLONASS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Galileo and GLONASS Spirent Federal Systems Training Seminar 2007 Jonathan Hooper

  2. Agenda • Galileo Background and Status • Galileo Testing • Galileo + GPS • GLONASS Background and Status • GLONASS Testing

  3. Galileo

  4. A Global Navigation System from Europe • Galileo is a space-based navigation system designed to be ‘Interoperable’ with GPS • Constellation of Medium Earth Orbit (MEO) Satellites • like GPS • Three Orbital Planes • GPS has six • Operates in L-Band • like GPS • CDMA • like GPS • Multiple Services • More than GPS, some of which must be paid for

  5. The Galileo Services • Open Service (OS) at E5a, E5b & L1-B • No fee for use • No guarantee of service • Similar to GPS L1 and L2C • Commercial Service (CS) at E6-B • Guaranteed level of service availability • Encrypted data (via fee) on all frequencies to deliver service • Safety-of-Life Service (SOL) at E5b and L1-B • No fee for use • High Integrity Levels for Civil Aircraft landing, etc(Like L5 GPS) • Public Regulated Service at L1-A and E6-A • Encrypted for Government use

  6. The Signals (L1) • L1 Frequency - 1575.42MHz (B/W 40.92MHz) • Same frequency as GPS L1 • Three signals - A/B/C • L1-A carries part of Public Regulated Service (PRS) • Classified part, Equivalent to GPS M-Code • Encrypted signals and data • L1 B/C carries part of Open Service (OS) • Free for general use, equivalent of GPS C/A code • Only the B signal has data, the C aids overall signal tracking • Data includes some system Integrity Information • SAR RLM service

  7. The Signals (E5) • E5 Frequencies (Centre 1191.795MHz B/W 92.07MHz) • E5a = 1176.45MHz (Includes GPS L5 frequency) • E5b = 1207.14MHz • Extra bandwidth aids multipath resolution • Two signals - a/b, each with two sub-elements • E5a-I carries part of Open Service • Free part, Nearest equivalent to GPS C/A Code • No Integrity information in its data • E5a-Q dataless pilot channel • E5b-I carries part of Open Service • Free part, designed particularly for aircraft use and Safety-of-Life (SOL Service) Applications • Integrity information as for L1-B • E5b-Q dataless pilot channel

  8. The Signals (E6) • E6 Frequency - 1278.75MHz (B/W 40.92MHz) • Slightly above GPS L2 frequency • Three signals - A/B/C • E6-A carries part of Public Regulated Service • Classified part, Equivalent to GPS M-Code • Encrypted signals and data • E6 B/C carries Commercial Service (CS) • Chargeable, signals similar to GPS L5 • Optionally encrypted signals and data • Only the B signal has data, the C aids overall signal tracking • Higher accuracy and performance than OS with guarantees

  9. The Frequency Spectrum BOC(1,1)

  10. GSS7800 for Galileo Programmes • Designed to be compliant with full SISICD • L1-B (data) with I/Nav messages and L1-C (Pilot) • L1-A PRS encrypted signalling* • E6-B (data) with C/Nav messages and E6-C (Pilot) – Encrypted • E6-A PRS encrypted signalling* • E5a with F/Nav data (I) and pilot (Q) • E5b with I/Nav data (I) and pilot (Q) • Spirent Product Specification MS3031 • Up to 16 channels per chassis • L1 and E5a+E5b and E6 * Requires additional approval

  11. GSS7800 Commercial Galileo OS* • Designed to be compliant with OS SISICD provided by GJU* • L1-B (data) with I/Nav messages • L1-C (pilot) • L1-A & E6-A as PRS-Noise • Spectrally exact representation of PRS – GPS P-codes, no data • E5a with F/Nav data (I) and pilot (Q) • E5b with I/Nav data (I) and pilot (Q) • Spirent Product Specification MS3043* • Up to 16 channels per chassis • L1 and E5a+E5b * Due to OS SISICD terms of use Spirent’s initial offering will be generic (ref: MS3047), with upgrade to SISICD compliancy when possible

  12. GSS7800 Generic GNSS • Product specification available from Spirent now (MS3047) • L1-B (data) with uncommitted Memory Codes • Data from a file • L1-C (Pilot) with uncommitted Memory Codes • L1-A as PRS-Noise • Spectrally exact representation of PRS – GPS P-codes, no data • E5a (Idata/Qpilot) with uncommitted Memory Codes • Data (I) from a file • E5b (Idata/Qpilot) with uncommitted Memory Codes • Data (I) from a file • Upgrade to OS SISICD compliancy when possible

  13. Galileo Public Regulated Service (PRS) • Current status • Galileo will operate under civil control • Encrypted PRS signal for use by public safety organisations such as police, fire, customs agencies • EU has not approved use for military applications • PRS summary • Two signals: L1-A and E6-A • Encrypted for controlled access • L1-A modulation: BOC(15,2.5)cos • E6-A modulation: BOC(10,5)cos • G/Nav data messages

  14. Spirent Test Solution for Galileo PRS • Status: • Under development for official IOV contracts • Architecture: • FPGA in generator provides all COMSEC and NAVSEC functions • SimGEN provides unencrypted G/Nav data through GUI • Availability: • SimPRS is initial product designator • Subject to availability controls • Galileo Programme Security Instruction (PSI) • Please speak to us for further information

  15. L1/E5ab GalileoDemonstrator L1 Galileo Demonstrator L1 E5ab E6 ** for Non-PRS GRC, GSS, TUS • GNSS Constellation • Simulator • - Public Domain Information • Galileo Modulation • Memory Codes from File • Data messages from a file L1 E5ab OS GSS7800Commercial Galileo Simulator* L1 E6for PRS GRC Galileo Simulator Road Map 2004/5 2006 2007 *availability dependson licence issues **PRS on some configurations

  16. Septentrio L1 PVT NordNav L1 PVT Galileo Works!! ION-GNSS-2006 Ft. Worth, Texas GSS7800 L1/E5ab Simulator Spirent Booth

  17. GSS7800 Galileo Simulator:Origins • Based on GSS7700 GPS Simulator Platform • SimGEN software expanded • Signal Generator modifications • Inherently capable of integrated GNSS with GSS7700 GPS/SBAS L1 E5ab E6GSS7800 Galileo Simulator

  18. Spirent GSS7800 Galileo Simulator:GSS7700 Hardware Reuse • Chassis, including • PSU/Case • Cardframe/Backplane • CPU/IEEE • Panels and Display • RF Modules • LO Synthesiser • Combiner • Upconverter • Ref Oscillator • Detector

  19. Spirent GSS7800 Galileo Simulator:Hardware Modifications • Extra carrier • L1, E5ab and E6 • Extra upconverter • Plus extra LOs • New signal generator cards • Support 92MHz bandwidth • BOC signalling • New IF Modules • Wideband, Quad Density

  20. New Signal Generator Board All Ranging Codes are implemented as Memory Codes New Xilinx Virtex4 FPGA (heatsink not shown) VME Interface New 240MHz DAC New 120MHz Clock Compact Flash

  21. New IF Module • ½ size, 2 x capacity, 3 x Bandwidth New IF Module Old IF Module

  22. SimGEN

  23. SimGEN Changes • Signal Selection Support • Memory Code Support • New Constellation Editor • Similar Format to GPS • Data Message Calculation • New Iono Model • ESA NeQuick Model • All other facilities retained • Vehicle Motion Models • Remote Control • Antenna Patterns, etc

  24. SimGEN Changes

  25. New Constellation Editor • Similar to GPS • Supports up to 36 satellites

  26. Other Constellation Features • PRN • Group delays • Signal Selection • On or Off • Data Message • Calc or File

  27. Status Control – Flags and Alerts

  28. Other Constellation Features • Galileo power levelsare nominally higherthan GPS • Support For GST and offsets

  29. Galileo NeQuick Iono Model • Single Frequency user support • Computationally intensive model

  30. Galileo + GPS • More Satellites = Better Performance • Better availability and increased integrity • Better geometry and performance • Redundancy • If one system fails the other can be used • Spirent Simulation • Multi-box system fundamentally the same as for 2 box GPS • Developing new techniques to time align the GPS & Galileo systems

  31. GLONASS

  32. GLONASS Constellation • Global Navigation Satellite System (GLONASS) • Operated by Russian Space Forces • 12 operational satellites (12-2006) • Planned fully operational by 2008 (18 satellites) • 24 satellites by 2010 in 3 orbital planes • Spirent GLONASS Simulator • L1 available today: STR4780 • L2 planned: delivery from mid-2008

  33. Frequencies • The L1 signal has a frequency division multiple access (FDMA) scheme • L1 = 1602 MHz + 0.5625n MHz, where n is the channel number (n = -7 to +13) • The L2 signal also has a frequency division multiple access (FDMA) scheme • L2 = 1246 MHZ + 0.4375m MHz, where m is the channel number(m = -7 to +13) • Only using channels 1-12 at the moment (as of 2005)

  34. Signal Types • GLONASS satellites transmit two types of signals • Standard precision (SP) for civil users worldwide • High precision (HP) for restricted use (MoD authorised) • They are both transmitted on both frequencies • The standard accuracy signal has a clock rate of 0.511 MHz • The high accuracy signal has a clock rate of 5.11 MHz • Nav data message transmitted at 50 bps • Repeating superframes of 2.5mins duration containing 5 frames • Frame lasts 30s containing 15 strings -> string lasts 2s

  35. GPS + GLONASS Simulators • ESTEC (European Space Research and Technology Centre) • STR4760 16ch L1 + L2 GPS • STR4750 12ch L5 GPS • STR4780 12ch GLONASS • Agilent Signal Generator (Interferer) & STR4766 Combiner Unit • STR4767 Distribution Unit • Single output port

  36. GPS + Galileo Simulators • Proposed update to ESTEC system • GSS7700 L1 + L2 • GSS7700 L5 • GSS7800 L1 + E5 + E6 • GSS4780 GLONASS • Agilent Signal Generator (Interferer) & GSS4766 Combiner Unit • STR4767 Distribution Unit • Rackmount PC, screen & keyboard • GPS + Galileo or GPS + GLONASS operation

  37. Summary • Spirent has test systems available for testing Galileo and GLONASS receivers • Galileo L1, E5 and E6 frequencies and codes are available • GLONASS L1 capability is available • Galileo and GLONASS are interoperable with GPS and provide beneficial integrity and accuracy benefits to GPS

  38. End of Presentation Questions / Comments?

More Related