Herbert Landau by k966Xd


									GNSS Reference Station
 Network Applications
  Status and Vision

        Herbert Landau
    Trimble Munich, Germany
          January 2011

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

                    GNSS Integrity Monitoring

Software Platform

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

 • More than 4000 stations operated by Trimble
 • 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

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

    Earthquake in Chile February 27, 2010
Monitoring in VRS³Net

       Santiago movement
       Feb. 27, 2010, Day 58

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

       Rate up to decimeters per year
Example: Bridge collapse

  Update rates up to 10 Hz
GNSS Networks & Meteorology
• Water vapor highly variable quantity
• Water vapor for short-term forecasts of
• 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
• 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
  – GPS L5, GLONASS CDMA, Galileo, QZSS,
    Compass, IRNSS


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