Abstract:
This paper presents the results of the time series analysis for 1997, 1998 and 1999 for the permanent GPS stations of Medicina, Genoa, Noto, Turin, Cagliari, Perugia and Venice, belonging to the Italian GPS Fiducial Network of the ASI. The BPE module of the Bernese software v.4.2 was used to process data to obtain time series of daily solutions. The model used for the least-square interpolation of the series allowed us to consider both the secular trend (uniform motion) and periodic variations (period of one year), as well as possible jumps in the series. The DIA (Detection Identification Adaptation) procedure was used to remove blunders. The statistical analysis also included an estimate of the internal reliability of the time series.