Karolina Szafranek

Investigation of the 16-year and 18-year ZTD Time Series Derived from GPS Data Processing

The GPS system can play an important role in activities related to the monitoring of climate. Long time series, coherent strategy, and very high quality of tropospheric parameter Zenith Tropospheric Delay (ZTD) estimated on the basis of GPS data analysis allows to investigate its usefulness for climate research as a direct GPS product. This paper presents results of analysis of 16-year time series derived from EUREF Permanent Network (EPN) reprocessing performed by the Military University of Technology. For 58 stations Lomb-Scargle periodograms were performed in order to obtain information about the oscillations in ZTD time series. Seasonal components and linear trend were estimated using Least Square Estimation (LSE) and Mann—Kendall trend test was used to confirm the presence of a linear trend designated by LSE method. In order to verify the impact of the length of time series on trend value, comparison between 16 and 18 years were performed.

ASG-EUPOS Monitoring with Reference to EPN

ASG-EUPOS Monitoring with Reference to EPN This paper concerns methods and results of processing of data collected by ASG-EUPOS (Active Geodetic Network - European Position Determination System) sites since the beginning of the system. The elaboration was made by Centre of Applied Geomatics from Military University of Technology and it was based on the experience gained during EPN (European Permanent Network) processing. Strategy was similar to strategy used by EPN Local Analysis Centers for European network elaborations and EPN test reprocessing (Kenyeres et al., 2008). As the outcome daily and weekly solutions (North, East, Up component for each station) were obtained. Basing on weekly solutions local velocities and vertical movements were determined. Preliminary tests of combining national and regional networks were also made and results were compared to official EPN solutions (differences below 1 cm). Daily solutions were analyzed in the context of stability and reliability basing on time series standard deviation.

Geokinematics in GGOS - Different Relations and Dependences

Geokinematics in GGOS - Different Relations and Dependences The paper presents the preliminary results of the analysis of fundamental dependencies between different geodetic concepts related to the one of the GGOS (Global Geodetic Observation System) pillars called Geometry and Kinematics. These relationships are described using UML (Unified Modelling Language) - one of the graphical notations that can be used for information modelling. Concepts are represented as classes with their names, attributes, and different kinds of links between them. The main purpose of this paper is to introduce the full description of connections between all GGOS components.