Periodic surveys are expensive and do not provide real time monitoring capability. The worldwide availability of the GPS signal makes it possible to develop automatic and real time monmitoring deformation of large structures and earth movements. Recent advance from Condor Earth Technologies can provide sub-centimeter accuracy for real time and long term deformation monitoring. The Condor approach is based upon the processing of GPS carrier phase measurements treated as triple differences within a Kalman filter algorithm; this methods allows sub-centimeter accuracy, avoiding the effects of cycle slips in a long term monitoring project. In order to test the system, a special support system allowing general 3D movements of a GPS antenna was designd and the raw GPS data were processed together with the same data coming from the EUREF UNPG GPS Permenent Station via the HYDRA software. The experimental results show that, after a relatively short initial convergence time, sub-cenimeter accuracy and a robust convergence of the system to the imposed deformation with immunity fom cycle slips were obtained. Therefore, the software seems to be a very powerful processing tool for a real time and long term GPS monitoring system in controlling dam movements, landslides, subsidence processes and other natural phenomena.

Testing a real-time GPS system for quasi-static deformation monitoring of ground surface and large structures

RADICIONI, Fabio
2000

Abstract

Periodic surveys are expensive and do not provide real time monitoring capability. The worldwide availability of the GPS signal makes it possible to develop automatic and real time monmitoring deformation of large structures and earth movements. Recent advance from Condor Earth Technologies can provide sub-centimeter accuracy for real time and long term deformation monitoring. The Condor approach is based upon the processing of GPS carrier phase measurements treated as triple differences within a Kalman filter algorithm; this methods allows sub-centimeter accuracy, avoiding the effects of cycle slips in a long term monitoring project. In order to test the system, a special support system allowing general 3D movements of a GPS antenna was designd and the raw GPS data were processed together with the same data coming from the EUREF UNPG GPS Permenent Station via the HYDRA software. The experimental results show that, after a relatively short initial convergence time, sub-cenimeter accuracy and a robust convergence of the system to the imposed deformation with immunity fom cycle slips were obtained. Therefore, the software seems to be a very powerful processing tool for a real time and long term GPS monitoring system in controlling dam movements, landslides, subsidence processes and other natural phenomena.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/13771
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