This study is concerned with the analysis of the displacement measurements simultaneously retrieved from multiple Doppler radars placed at different positions of a traffic light’s mast. Currently, the structural health monitoring (SHM) works based on portable Doppler radars consider primarily methods for the extraction of displacement measurements. However, other measurements in the form of instantaneous natural frequencies and mode shapes can also be calculated with the use of Doppler radars arranged as an array. In this article, the wind-induced vibration displacement analysis based on a low-cost Doppler radar array is proposed. The sensitivity of the proposed array to changes in the instantaneous natural frequencies is evaluated. In addition, the structural modal analysis based on a Doppler radar array operating in the passive backscattering mode is demonstrated. The accuracy of the measurements obtained from the radars’ demodulated data is compared with the accelerometer-based measurements. The ability of the proposed array to provide instantaneous natural frequency measurements and structural modal analysis is validated by the experimental results.

中文翻译：

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基于低成本多普勒雷达阵列的交通灯结构风致位移分析

这项研究涉及对从放置在交通灯桅杆不同位置的多个多普勒雷达同时获取的位移测量值的分析。目前，基于便携式多普勒雷达的结构健康监测 (SHM) 工作主要考虑提取位移测量值的方法。然而，也可以使用排列成阵列的多普勒雷达来计算瞬时固有频率和模态形状形式的其他测量值。在本文中，提出了基于低成本多普勒雷达阵列的风致振动位移分析。评估了所提出的阵列对瞬时自然频率变化的敏感性。此外，演示了基于在被动反向散射模式下工作的多普勒雷达阵列的结构模态分析。将从雷达解调数据获得的测量精度与基于加速度计的测量结果进行比较。实验结果验证了所提出的阵列提供瞬时固有频率测量和结构模态分析的能力。