Mr. Jan Douša M.Sc., Ph.D.
Future Forces Forum
Geodetic Observatory Pecný
Research Institute of Geodesy, Topography and Cartography
17 Years of Precise GNSS Tropospheric Products and Services from Geodetic Observatory Pecný
Co-presentation with Mr. Pavel VÁCLAVOVIC
Geodetic Observatory Pecný (GOP) has a long-term experience in developing and estimating precise tropospheric parameters using data from GNSS permanent stations, in particular under the limited timelines of near real time. For more than 17 years, the GOP Zenith Total Delay (ZTD) product has contributed to various projects in Europe (COST-716, TOUGH, E-GVAP, GNSS4SWEC, EUREF, IGS) with over a decade flowing via the meteorological observation exchange network to end users worldwide. Currently, the GOP regional and global ZTD products are routinely assimilated in Météo France and UK MetOffice and exploited in other meteorological institutions. During the period, GOP has extended the list of tropospheric products and activities towards a variety of solutions covering all different temporal, spatial, and qualitative scales. The tropospheric products are thus provided from several regional European networks as well as from a global one. The products update ranges from the re-processing activities to the near real-time and real-time generation. The solutions consist of various parameterizations - standard (ZTD only) and advanced (ZTD, horizontal gradients, slant delays) and uses multi-GNSS data and high-resolution parameter sampling. Our recent activities have focused on the software development. We have installed the in-house GOP-TropNET system (http://www.pecny.cz/Joomla25/index.php/trop-net) at several institutions in support of establishing new E-GVAP analyses centres for near real-time troposphere solutions. We have completed the development of in-house G-Nut/Tefnut software (http://www.pecny.cz/Joomla25/index.php/gnss/sw/tefnut) for real-time troposphere monitoring with support of all GNSS constellations (GPS, GLONASS, Galileo, BeiDou) and all possible parameters (ZTD, troposheric horizontal gradients and slant delays). Finally, we are developing a powerful system, GOP-TropDB (http://www.pecny.cz/Joomla25/index.php/gop-tropdb), for the evaluation of tropospheric parameters gained from different observation techniques which is planned for serving a wide community in the framework of the International GNSS Service (IGS) in future. The presentation will give a summary over these developments and achieved results.
Jan Douša received his MSc and PhD degrees in geodesy from the Czech Technical University in Prague in 1995 and 1999, respectively. Since 2000, he has been working at the Geodetic Observatory Pecný (GOP) for developing high-accuracy GNSS applications. During 2009-2011, he shared a part-time job in Deutsches GeoForschungsZentrum (GFZ) Potsdam. His main interests are in precise GNSS analyses for a variety of user applications, software development and troposphere modeling exploiting GNSS and numerical weather model data. At GOP, he leads the GNSS group for data analysis and the G-Nut software development. He has been responsible for the development of GNSS analysis centers for IGS (precise orbit determination), EUREF (reference frame maintenance and velocity field estimation), E-GVAP, COST-716, TOUGH and GNSS4SWEC (near real-time troposphere monitoring), CEGRN (solid Earth science) and others. He leaded 8 national scientific projects and contributed to others. Currently, he is coordinating the ESA project on the development of troposphere model while he has contributed to other 10 European projects. He is a member of the EUREF Technical Working Group (2007-2016), associate member of IGS, member of E-GVAP expert team, chair of WG1 COST-ES1206 (GNSS4SWEC) project, chair and vice-chair of several IAG working groups and member of several others. He is the author or co-author of more than 100 scientific papers (>50 peer-reviewed).