DBPapers
DOI: 10.5593/SGEM2014/B22/S9.005

ANALYSIS OF LONG TIME SERIES OF TROPOSPHERIC PARAMETERS DERIVED FROM GPS DATA PROCESSING

Z. Baldysz, K. Szafranek, J. Bogusz, M. Figurski, G. Nykiel
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-11-7 / ISSN 1314-2704, June 19-25, 2014, Book 2, Vol. 2, 35-42 pp

ABSTRACT
Very high quality of tropospheric delays determination on the basis of data from GPS (Global Positioning System) permanent stations allows to investigate them for the benefits of various economic and scientific areas. The paper presents results of the analysis of ZTD (Zenith Tropospheric Delay) time series resulted from the EPN (EUREF Permanent Network) reprocessing performed by the Military University of Technology. Through the homogenous strategy used for the whole period of processing (since 1996 to 2011, but the length of time series depends on the particular station), the final precision of ZTD values is estimated to be at the level of 2-3 millimeters. In addition, EPN station are equipped with meteorological sensors, so time series of IWV (Integrated Water Vapour) were also determined for the exemplary station MATE (only few EPN stations have long observation history concerning meteorological data). Time series of these parameters were analyzed in order to find short- and long-term trends which could be associated with the meteorological conditions and climate change. In particular linear trend and seasonal components (annual and semi-annual) were estimated on the basis of IWV time series using Least Squares Estimation (LSE).

Keywords: GPS processing, troposphere, ZTD, IWV, time series