Final report presented by partner UNIPD for the period 01 april 2003 - 31 july 2006

• Autorzy: Caporali A. , Facchinetti C. , Bonafede L.
• Języki publikacji: PL

Abstrakty

EN

Within the Project our group has been responsible ofWP6, which addresses the stability of time series of coordinates of GPS stations used in the project. In addition we have supported WP1, WP4, WP7 and WP10.1, as scheduled. The time series we have analysed result from WP1 and WP5. We have combined normal equations from the EUREF network, and selected those stations which are relevant to the CERGOP 2 project. Likewise for Italian and Austrian stations we have stacked normal equations pertaining the national networks, and obtained time series which are useful to the science part of the Project. Finally we have addressed the normal equations of the CEGRN campaigns, up to the CEGRN 03 campaign, constructed time series and checked for their continuity. An in depth analysis of the time series was done for those sites which have been active with continuity for at least three years. We did this analysis for all the stations which met this requisite, including time series of a number of stations computed by the Austrian partner OLG. The analysis consisted in the identification, in the time and frequency domains of specific signatures, typically annual and semi annual, affecting the time series and can be of various origin, such as seasonal water flow or thermal dilatation of the antenna mount. After removal of the periodic signals, the power spectral density has been computed and the white and coloured components in tte noise could be characterized. We report in most cases flicker phase noise at low frequencies and white noise at higher frequencies (>2 cycles/year), with a few exceptions in which the noise is white at all frequencies. A few stability problems are reported. In particular our own ASIA station was affected by mount instability in connection to a snow storm in February 2006. This event was promptly noticed from the analysis and the mount problem could be solved. We have checked for local instabilities by at deviations of the estimated velocities from the expected pattern. We have verified that the stations contributing to the project have velocities agreeing with theoretical predictions. When this does not happen, then the station in most cases has a marginal tracking history, and we suspect that the discrepancies are attributable to a weak data set, more than true instability. Tie contribution to the Project includes, besides the data analysis part, two new permanent stations which were installed in Asiago and Rovigo as part of the Project, aad regularly operated. Two doctoral stipendia have been awarded, and a Web page to our WP6 has been constructed, regularly maintained and linked to the Projects web page.

Słowa kluczowe

PL

CERGOP-2 projekt; Włochy; sieci GPS

EN

CERGOP-2 project; Italy; GPS networks

• Wydawca: Wydział Geodezji i Kartografii Politechniki Warszawskiej
• Czasopismo: Reports on Geodesy
• Rocznik: 2006
• Tom: z. 4/79
• Strony: 399--417
• Opis fizyczny: rys., tab., zdj.

Twórcy

autor

Caporali A.

autor

Facchinetti C.

autor

Bonafede L.

• University of Padova, Department of Geology, Paleontology and Geophysics