1. 1 GNSS Reference Station Network Applications – Status and Vision Herbert Landau Trimble Munich, Germany January 2011

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

3. Trimble Multi-Server Software Platform ? Software Platform VRS Networks GNSS Integrity Monitoring Monitoring Atmospheric Research

4. 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

5. Reference Station data streaming to the Control Center

6. User receiver sends its position to the Control Center via cell phone Position

7. Control Center transmits optimized correction stream for each user via cell phone (creating a virtual local reference station VRS)

8. Network RTK Applications Survey Machine control Agriculture Mapping&GIS

9. Monitoring in VRS³Net Plate Tectonics

10. Earthquake in Chile February 27, 2010 Monitoring in VRS³Net Earthquakes

11. Earthquake in Chile February 27, 2010 Monitoring in VRS³Net Earthquakes Santiago movement Feb. 27, 2010, Day 58

12. Monitoring Example: Subsidence of Oil Platforms Rate up to decimeters per year

13. Monitoring Example: Bridge collapse Update rates up to 10 Hz

14. 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

15. GNSS derived Water Vapor European Network (estimates every 15 seconds) Radar Image GNSS derived water vapor

16. Ionospheric Solar Cycle Maximum in 2013/2014

17. 06:00 am UTC 12:00 am UTC06:00 pm UTC Ionosphere and GNSS Real-Time Warning Sytem

18. 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 18