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Global Navigation Satellite System (GNSS) update
 

Global Navigation Satellite System (GNSS) update

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By Martin de Kievit (Sales Manager Marine at Trimble, The Netherlands) ...

By Martin de Kievit (Sales Manager Marine at Trimble, The Netherlands)



The demand for greater positioning accuracy with more reliability for waterways and marine positioning is aided with more satellite availability. While GPS from USA, and GLONASS from Russia, have been the mainstay of GNSS for the last few years we have seen three new constellations – QZSS from Japan, BeiDou (Compass) from China and GALILEO from Europe.

This presentation reviews the current status of all the GNSS constellations. Other new developments which will be touched briefly;

-Updated Geoid Model EGM-96,

-Due to doubling of the number of satellites, the corrections needed for precise GNSS, have also doubled so a new correction format is explained.

Furthermore we will tell you something about the latest RTX service (corrections over satellite) and xFILL technology (maintaining your positioning after you lose your GNSS signal).

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  • Abstract <br /> The demand for greater positioning accuracy with more reliability for waterways and marine positioning is aided with more satellite availability. While GPS from USA, and GLONASS from Russia, have been the mainstay of GNSS for the last few years we have seen three new constellations – QZSS from Japan, Compass from China and GALILEO from Europe progressed and some satellites launched. This presentation reviews the current status of all the GNSS constellations. We then look forward 5 years and give scenarios of services and accuracies that might be possible. With the doubling of the number of satellites, the corrections needed for precise GNSS, have also doubled so a new correction format is explained. The SP985 & BX982 receiver features are introduced. Up till now the Smart Antenna has not been suitable for marine projects but the SPS985 is extremely rugged and has a Wi-Fi capability for transmission of corrections and position/attitude useful for marine. <br />
  • L2CS provides signal-to-noise benefits over proprietary L2 P/Y tracking without direct code-correlation <br />
  • L5 Deadline – in orbit/operational, secure L5 frequency allocation <br /> Experimental L5 payload on IIR-M <br />

Global Navigation Satellite System (GNSS) update Global Navigation Satellite System (GNSS) update Presentation Transcript

  • Impact of New SPS GNSS Receivers and Constellations on Precise Marine Positioning Martin de Kievit
  • More Satellites are needed Congested marine spaces Congested vessels Demand for greater accuracy
  • GPS/GLONASS   GPS – 31 satellites active (Sept ‘13) – L1 C/A & P(Y) – L2 P(Y) & L2C (IIR-M) – L5 (IIF) – First satellite launched May 2010 GLONASS – 24 satellites healthy (Sept ‘13) as well as satellites in residual status – L1 C/A & P – L2 C/A (-M) & P
  • Multi-frequency/Multi-System Antenna - L1/L5/E6 Galileo Ready – shipping since 2005
  • Inside the GNSS receiver  Trimble 360°technology is used in SPS985 and SPS855 and BX 982 receivers  Dual Maxwell VI - 6th Generation Chip ASIC  2x 220 = 440 Channels  GPS/GLONASS/Galileo/QZSS/Compass compliant – For all current civilian open signals
  • GPS Modernization: L2C  First satellite launched September 2005 – 8 Block IIR-M satellites so far – 1 Block IIF (adds L5)
  • L2C Signal Strength = Productivity
  • GPS Modernization: L5  New 3rd frequency band  GPS Block IIF satellites – Block III will complete L5/L2C constellation  First launch occurred May 2010  Block IIF - also broadcast L2C signals  SPS GNSS – Capable of tracking L5 – Tested with the simulator and GPS IIF modulator – Successfully tracking L5  PRN 1 (IIR-M with L5)  PRN 25 (IIF)
  • Trimble Simulation capability  L1/L2/L5 GPS & E1/E5A/E5B Galileo JPO L2-C / L5 Modulator Tests
  • New GNSS Signals
  • In the not too distant future… Global Constellations GPS (31) GLONASS (24) Galileo (22+) Compass (~30) Regional Constellations – QZSS (3) – IRNSS (7) Satellite-Based Augmentations WAAS (3) MSAS (2) EGNOS (3) GAGAN (3) SDCM
  • SBAS systems
  • IRNSS and GAGAN  Indian Regional Nav Satellite System – Orbits similar to QZSS – inclined Geostationary orbit – L5 & S-Band – 7 Satellites planned – First launched to be decided – No public ICD  GAGAN – Is a SBAS satellite over India – First satellite was launched in 2011, a second one was launched in 2012 – Full constellation of three satellites should be ready end of 2014
  • GPS L1C / GPS III  L1C – Third GPS Civilian Signal  GPS III (2014 first launch) – Also on QZSS  ICD is public  Modulation – Very similar to Galileo – More multipath immunity c.f. C/A
  • QZSS Quasi-Zenith Satellite System Eccentric Geo-synchronous Orbit L1 C/A, L1C, L2C, E6 & L5 First satellite launched September 2010 Augments GNSS in deep urban canyon Satellite appears at a high elevation for an extended time period over Japan and Asia Pacific  QZSS included in Trimble 360TM Technology       – SPS985 and SPS855 support this by default – Trimble Tracking L1 C/A, SAIF, L2C, L5 – Also tracked L1C (first satellite to have L1C)
  • QZSS Orbit
  • QZSS Tracking Melbourne – November 2010 (CNo)
  • Beidou/Compass  Beidou – Geostationary active ranging system over China  Beidou-2 / Compass – MEO(Medium Earth Orbit / 16.000 km) , GEO (Geostationary Earth Orbit /36.000 km) and Inclined GEO  MEO satellite component system similar to GPS – First test satellite (MEO) launched early 2007  1 GEO failed in 2009  4 launches in 2010 (3 GEOs, 3 inclined GEO, 1 MEO) – No public ICD – PRN Codes reverse engineered by Stanford University  Ephemeris/Clock etc format unknown – Codes will have similar performance to GPS  Although quality of the clocks, orbital modeling etc. are still unknown
  • Compass  10 active satellites in space – 4x GEO – transmitting – 1x GEO – failed – 1x MEO – transmitting (oldest satellite from March 2007) – 5x Inclined GEO  3 Bands (B1, B2 & B3)  Trimble 360TM Technology – Inside SPS985 and SPS855 – Tracking all 3 bands
  • Compass  No public ICD (Interface Control Document) – Tracking based on Stanford University work – No ephemeris/clock/almanac information (no ICD) – Able to produce code/carrier measurements but not position
  • Compass Inclined Orbit Geo-Sync
  • Compass Data
  • Galileo  European System – 2 Test Satellites (don’t conform to the Galileo ICD)  Giove-A Launched Dec 2005  Giove-B Launched April 2008 – 4 IOV satellites – started in October 2011 (2) – 22 further funded satellites to come  Original plan 27 – 30 satellites (only a subset funded)  Open Services – Require a license  Trimble IP supports Galileo and Trimble has a license to commercialize  Other Signals/Bands – E6 – commercial service (CS) – PRS – public regulated service – No public ICD for CS or PRS signals
  • Five Galileo Services  Open access navigation  No charge, positioning down to 1 metre  Commercial navigation (encrypted)  To the centimetre; service providers will charge fees  Safety Of life navigation  Open service for applications where guaranteed precision is essential  Public regulated navigation (encrypted)  Continuous availability even if other services are disabled in time of crisis; Government agencies will be main users.  Search and rescue  System will pick up distress beacon locations; feasible to send feedback
  • GIOVE-A Pseudorange noise  Pseudorange measurement  No code/carrier filtering  E1 includes Everest Multipath mitigation
  • Summary – current constellation  GPS – 31 active  GLONASS – 24 active  Compass – 10 active  Galileo – 2 GIOVE test satellites, 2 IOV satellites  QZSS – 1 active  SBAS – WAAS (3) / EGNOS (3) / MSAS (2) / GAGAN (2)  Current Total = 75+ GNSS satellites – Plus additional in orbit non-transmitting spares (eg. GPS & GLONASS)
  • Too many satellites?
  • CMRx Data format  The Problem: – Existing data formats too long when more satellites and more constellations are launched – Need to reduce data volumes when using cell phone technology – Licenses for wider band radios harder to obtain  The Solution: – Trimble’s CMRx proprietary format transmitted from Base Station
  • Marine GNSS receivers SPS985 SPS855 Rover SPS855 Base SPS855 & 555H Rover & Heading sensor
  • SPS985 Smart Antenna Scalable accuracy modes ‘Portable’ base or Rover Battery door – ultra rugged. Removable 2.4 Ah battery Quick Release adapter for one click on/off pole Tracks GPS, GLONASS, QZSS, Compass, Galileo, Marinestar, SBAS Bluetooth to Tablet or Computer Wi-Fi for licence free radio and access to Web UI Internal wideband 410-470 MHz or licence free 900MHz
  • NEW BX 982 GNSS Modular Heading Receiver Rugged Housing Configuration through our standard web browser 3x RS232, 1 x USB, 1x CAN , and 1 x LAN Ethernet Port Dual Antenna input Tracks GPS, GLONASS, QZSS, Compass, Galileo, SBAS Support for Marinestar VBS,XP,G2 and HP 2 x 220channel Trimble Maxwell chip sets Support for FDE and RAIM = Positioning Integrity Monitoring
  • Fugro Marinestar now available on Trimble receivers  Receivers capable of receiving Marinestar VBS,XP,G2 and HP: – SPS461, SPS855, SPS985 and BX982 with upgrade option Location RTK enabled  Applications Marinestar: – – – – – – – Navy & Defense applications (incl. Mine hunting) Hydrographic surveys Research Vessels Bathymetry Dredging Positioning buoys & Jack-up rigs And many others
  • Marine  Wi-Fi on Smart Antenna (SPS985)  Tracking structures – wirelessly  License free  Heading via Wi-Fi between SPS985’s  Updated Geoid Model EGM-96  More precise vertical – orthometric heights related to sea level  CMRx every 3 seconds – for slow radio links for long range offshore
  • Questions? martin_dekievit@trimble.com