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Authors: Betti, B.* 
Biagi, L.* 
Crespi, M* 
Riguzzi, F.* 
Title: GPS sensitivity analysis applied to non-permanent deformation control networks
Issue Date: 1999
Series/Report no.: /73 (1999)
Keywords: GPS
Deformation experiment
Non-permanent array
Subject Classification03. Hydrosphere::03.02. Hydrology::03.02.07. Instruments and techniques 
Abstract: This paper illustrates the surveys and the results obtained in an experiment whose goal is to evaluate the Global Positioning System (GPS) sensitivity and accuracy for deformation control on non-permanent network of di fferent extensions. To this aim a high-precision device was properly built to set up known displacements along three orthogonal axes of a GPS antenna. One of the antennas in the considered GPS networks was moved according to centimeter and sub-centimeter displacements; after careful GPS data pro- cessing, it was evaluated whether these simulated deformations were correctly a posteriori detected and at which probability level. This experiment was carried out both on a local (baselines ranging between 3 and 30 km)and on a regional (baselines ranging between 300 and 600 km) GPS network. The results show that in the local network it is possible to identify the displacements at a level of 10 mm in height and at a level of 5 mm in horizontal position. The analysis of the regional network showed that it is fundamental to investigate new strategies to model the troposphere; in fact, it is necessary to improve the precision of the height in order to correctly identify displacements lower than 60± 80 mm; on the contrary, horizontal displacements can be evidenced at the level of 20 mm.
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