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Engineering vibration monitoring by GPS: long duration records                             F. Casciati and C. Fuggini Department of Structural Mechanics, University of Pavia, Italy Abstract: Monitoring the performance of any structure requires real-time measurements of the change of position of critical points. Different techniques can be used for this purpose, each one offering advantages and disadvantages. The technique based on satellite positioning systems (GPS, GLONASS and the future GALILEO) seems to be very promising at least for long period structures. The GPS in particular provides sampling rates that are able to track dynamic displacements with high accuracy. Its service ability is independent of atmospheric conditions, temperature variations and visibility of the monitored object. This paper investigates the reliability and accuracy of the measurements of dual frequency GPS receivers. A linear electromagnetic motor moves an object along a given direction. The changes of position are compared with their estimates as recorded by a GPS receiver, whose antenna is located on the reference object. The comparison is based on sufficiently long records. Keywords: infrastructure monitoring; global positioning system (GPS); delay; positioning errors; multi-path error; signal geometric dilution of precision; linear motor amplitudes; power spectral densities กก

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