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Sensors 2016, 16(12), 2140; doi:10.3390/s16122140

Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements

Department of Civil and Environmental Engineering, Politecnico di Milano, Como 22100, Italy
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Received: 14 October 2016 / Revised: 1 December 2016 / Accepted: 5 December 2016 / Published: 15 December 2016
(This article belongs to the Section Remote Sensors)
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Abstract

The geodetic monitoring of local displacements and deformations is often needed for civil engineering structures and natural phenomena like, for example, landslides. A local permanent GNSS (Global Navigation Satellite Systems) network can be installed: receiver positions in the interest area are estimated and monitored with respect to reference stations. Usually, GNSS geodetic receivers are adopted and provide results with accuracies at the millimeter level: however, they are very expensive and the initial cost and the risk of damage and loss can discourage this approach. In this paper the accuracy and the reliability of low-cost u-blox GNSS receivers are experimentally investigated for local monitoring. Two experiments are analyzed. In the first, a baseline (65 m long) between one geodetic reference receiver and one u-blox is continuously observed for one week: the data are processed by hourly sessions and the results provide comparisons between two processing packages and a preliminary accuracy assessment. Then, a network composed of one geodetic and two u-blox receivers is set up. One u-blox is installed on a device (slide) that allows to apply controlled displacements. The geodetic and the other u-blox (at about 130 m) act as references. The experiment lasts about two weeks. The data are again processed by hourly sessions. The estimated displacements of the u-blox on the slide are analyzed and compared with the imposed displacements. All of the results are encouraging: in the first experiment the standard deviations of the residuals are smaller than 5 mm both in the horizontal and vertical; in the second, they are slightly worse but still satisfactory (5 mm in the horizontal and 13 mm in vertical) and the imposed displacements are almost correctly identified. View Full-Text
Keywords: low-cost GNSS receivers; u-blox; landslide monitoring; static surveying; time series analysis; displacements analysis low-cost GNSS receivers; u-blox; landslide monitoring; static surveying; time series analysis; displacements analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Biagi, L.; Grec, F.C.; Negretti, M. Low-Cost GNSS Receivers for Local Monitoring: Experimental Simulation, and Analysis of Displacements. Sensors 2016, 16, 2140.

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