Journal
ELECTRONICS
Volume 10, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/electronics10030247
Keywords
bridge monitoring; displacement vector; interferometry; MIMO; multi-monostatic radar; vibration measurement
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Funding
- Cassa di Risparmio Foundation, Firenze, Italy [45021, SIME 2020.1639]
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This article proposes a multi-monostatic radar for retrieving the displacement vector, which can simultaneously detect two independent displacement components. The radar was successfully tested in both a controlled environment and on a real bridge, confirming its effectiveness.
In recent years, interferometric radar has been extensively used as a sensor for static and dynamic monitoring of bridges. Generally speaking, a radar can only detect displacement components along the view direction. As the movement of a real bridge or of a large structure can be rather complex, this limitation can be a significant drawback in engineering practice. In order to overcome this limitation, in this article, a multi-monostatic radar for retrieving the displacement vector is proposed. It is basically a multiple input, multiple output (MIMO) interferometric radar, equipped with a transponder that consists of a pair of antennae, with relative amplifiers, connected to the radar with a radiofrequency (RF) cable. This arrangement allows for the simultaneous detection of two independent displacement components. The radar was successfully tested both in a controlled environment and in the field on a real bridge crossing the Arno river in Florence, Italy.
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