Herbert Landau

							GNSS Reference Station
 Network Applications
          –
  Status and Vision

        Herbert Landau
    Trimble Munich, Germany
          January 2011

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    Multiple use of GNSS Networks
•   GNSS network as reference frame
•   Positioning with cm-accuracy
•   Monitoring
•   Ionospheric research
•   Meteorology
                    VRS Networks




                    GNSS Integrity Monitoring




                    Monitoring
Software Platform

                    Atmospheric Research
                                                Trimble Multi-Server Software Platform
GNSS Networking
Real-Time Correction Services


 • More than 4000 stations operated by Trimble
   software
 • Eliminating/mitigating errors like orbit,
   ionosphere, troposphere
 • Real-time corrections to RTK rovers via
   GPRS/3G modems
 • cm-accurate RTK positioning in a unified
   coordinate frame
 • Better accuracy, reliability, productivity
 • International standard, e.g. RTCM
Reference Station data streaming to the Control Center
User receiver sends its position to the Control Center via
                       cell phone




                             Position
Control Center transmits optimized correction stream for each user via
      cell phone (creating a virtual local reference station VRS)
Network RTK Applications

                 •   Survey
                 •   Machine control
                 •   Agriculture
                 •   Mapping&GIS
Monitoring in VRS³Net
Plate Tectonics
Monitoring in VRS³Net
Earthquakes




    Earthquake in Chile February 27, 2010
Monitoring in VRS³Net
Earthquakes




       Santiago movement
       Feb. 27, 2010, Day 58




    Earthquake in Chile February 27, 2010
Monitoring
Example: Subsidence of Oil Platforms




       Rate up to decimeters per year
Monitoring
Example: Bridge collapse




  Update rates up to 10 Hz
GNSS Networks & Meteorology
• Water vapor highly variable quantity
• Water vapor for short-term forecasts of
  precipitation
• Water vapor (62%) biggest component to
  contribute to greenhouse effect (carbon
  dioxide 22%)
• Global increase of precipitable water observed
• Computation of Integrated Precipitable Water
  Vapor (IPWV) from
  – network GNSS data
  – Ground meteorological data
• RMS in IPWV < 1mm
 GNSS derived Water Vapor
 European Network (estimates every 15 seconds)




GNSS derived water vapor        Radar Image
Ionospheric Solar Cycle
Maximum in 2013/2014
   Ionosphere and GNSS
   Real-Time Warning Sytem




06:00 am UTC   12:00 am UTC   06:00 pm UTC
Summary
• Worldwide GNSS networks (several
  thousands of stations)
• Benefits for many scientific, state
  official and commercial applications
• Solutions for server and rovers
• New GNSS signals will increase
  applicability
  – GPS L5, GLONASS CDMA, Galileo, QZSS,
    Compass, IRNSS


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