Several authors have been investigating the potential of local positioning systems in structural control and monitoring. The idea is that any moving object has not to carry a sensor unit but just a device able to ―read‖ its position and to transmit it to a data storage/elaboration terminal. It is the same principle of GPS where however the satellites are replaced by local transponders and the reading unit is wireless. The main drawback is that transponders are still very expensive so that to implement such a technology could not find an acceptable market. It is expected that the innovation will soon introduce a new generation of cheaper transponders. So the next limitation should be approached and removed: the low accuracy when single readings are done. This paper investigates the possibility of increasing the accuracy of positioning by multiple readings and their differential elaboration. The case study adopts non contact laser displacement sensors (with the limitation of being installed in the plane of the motion). Two sensors are mounted: one of them addresses its beam to an object at rest. The second sensor is focused on the moving object. Elaborations from the readings of both the sensors are showed to increase the measured accuracy.

Local Positioning Accuracy

CASCIATI, FABIO;WU, LIJUN
2011-01-01

Abstract

Several authors have been investigating the potential of local positioning systems in structural control and monitoring. The idea is that any moving object has not to carry a sensor unit but just a device able to ―read‖ its position and to transmit it to a data storage/elaboration terminal. It is the same principle of GPS where however the satellites are replaced by local transponders and the reading unit is wireless. The main drawback is that transponders are still very expensive so that to implement such a technology could not find an acceptable market. It is expected that the innovation will soon introduce a new generation of cheaper transponders. So the next limitation should be approached and removed: the low accuracy when single readings are done. This paper investigates the possibility of increasing the accuracy of positioning by multiple readings and their differential elaboration. The case study adopts non contact laser displacement sensors (with the limitation of being installed in the plane of the motion). Two sensors are mounted: one of them addresses its beam to an object at rest. The second sensor is focused on the moving object. Elaborations from the readings of both the sensors are showed to increase the measured accuracy.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/271304
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