09 August 2012
Neutral atmospheric model in the region of GBAS for GNSS and meteorological applications
This public seminar will present the methodology behind current research into near real time neutral atmospheric model construction based on GNSS and meteorological observations.
Event details
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Title: |
Neutral atmospheric model in the region of GBAS for GNSS and meteorological applications |
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Person: |
Professor Jaroslaw Bosy |
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Date: |
2012-08-24 |
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Time: |
3.30pm – 4.30pm |
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Location: |
RMIT City campus, |
RSVP
The event is Free, however registration is recommended.
Register with sarah.gordon@rmit.edu.au, +61 3 9925 3720
Abstract
Global Navigation Satellite Systems (GNSS) have been designed for multiple applications including positioning and navigation. A number of GNSS applications require precise positioning with centimetre level accuracy in real time. Precise positioning in this mode is currently being implemented by two methods: differential Real Time Kinematics (RTK) and autonomous Precise Point Positioning (PPP). Positioning using the RTK or PPP methods can be supported by Ground Base Augmentation Systems (GBAS), which provide better stability of results in the regions surrounding GBAS networks. One of the elements supporting precise positioning, especially the height component is a model of the troposphere over the GBAS network area. Continuous observations from GNSS receivers provide an excellent tool for studying the neutral atmosphere, currently in near real time.
Since 2008, in the territory of Poland, a GBAS called ASG-EUPOS has been operational. This system continuously gathers GNSS data from 130 stations and meteorological (temperature, pressure and relative humidity) data from 17 stations. The average distance between GNSS stations is 70 km. The GNSS and meteorological data from the ASG-EUPOS network are the basis for building a model of the neutral atmosphere in near real-time. The spatial structure and temporal behaviour of the atmosphere (mainly water vapour in the atmosphere) is modelled using the GNSS tomography method.
This public seminar will present the methodology behind current research into near real time neutral atmospheric model construction based on GNSS and meteorological observations.
The first part of this talk will present the methodology of near real time GNSS data processing for estimating the Zenith Tropospheric Delay (ZTD) with reference data and products from the EPN/IGS processing centres. The second part will contain the procedure of integration and validation of ground-based meteorological observations delivered from various sources on the area of GBAS ASG-EUPOS network. The meteorological stations act as a support for aviation (METAR messages stations), or as country meteorological data suppliers (SYNOP messages stations), also there are stations collocated with GNSS antennas of GBAS system. The last part of this talk will present models for the 2D and 3D distribution of water vapour in the atmosphere.
Speaker Bio
Professor Jaroslaw Bosy is the Vice Head at the Institute of Geodesy and Geoinformatics at the Wroclaw University of Environmental and Life Sciences. Professor Bosy’s research expertise is in the fields of GNSS meteorology, GNSS tomography and atmospheric modelling using GNSS and GBAS.
His current research into GNSS relates to;
- The development of GNSS data processing strategies for high accuracy positioning;
- GNSS meteorology - determination of the state of the troposphere with the use of the GNSS radio signals;
- Near real time atmospheric models from GNSS and meteorological data based on the GNSS GBAS for real time GNSS (e.g. RTK, PPP) and meteorological applications;
- The realisation of reference frames on global, regional and local scale using GNSS techniques.