Pagnini Lorenzo, Miccinesi Lapo, Beni Alessandra, Pieraccini Massimiliano
Department of Information Engineering, University of Florence, 50139 Firenze, Italy.
Sensors (Basel). 2024 Mar 13;24(6):1839. doi: 10.3390/s24061839.
Interferometric radars are widely used for monitoring civil structures. Bridges are critical structures that need to be constantly monitored for the safety of the users. In this work, a frequency-modulated continuous wave (FMCW) multiple-input multiple-output (MIMO) radar was used for monitoring an arched bridge in Catanzaro, Italy. Two measurements were carried out; a first standard measurement was made in a monostatic configuration, while a subsequent measurement was carried out in a multimonostatic configuration in order to retrieve the components of the deck displacement. A method that is able to predict the measurement uncertainty as a function of the multimonostatic geometry is provided, thereby aiming to facilitate the operators in the choice of the proper experimental setup. The multimonostatic measurement revealed a displacement along the horizontal direction that was four times higher than the one along the vertical direction, while the values reported in the literature correspond to a ratio of at most around 0.2. This is the first time that such a large ratio detected by radar has been reported; at any rate, it is compatible with the arched structure of this specific bridge. This case study highlights the importance of techniques that are able to retrieve at least two components of the displacement.
干涉雷达被广泛用于监测民用建筑。桥梁是关键建筑，为保障使用者安全需持续监测。在本研究中，调频连续波（FMCW）多输入多输出（MIMO）雷达被用于监测意大利卡坦扎罗的一座拱桥。进行了两次测量；第一次标准测量采用单基地配置，随后的测量采用多基地配置以获取桥面位移分量。提供了一种能够根据多基地几何结构预测测量不确定度的方法，旨在帮助操作人员选择合适的实验装置。多基地测量显示水平方向的位移比垂直方向的位移高四倍，而文献报道的值的比例最多约为0.2。这是首次报道雷达检测到如此大的比例；无论如何，这与这座特定桥梁的拱形结构是相符的。该案例研究凸显了能够获取至少两个位移分量的技术的重要性。
