Measuring the vibrating states of an artificial structure is an important approach to monitor the stability of the structure. However, the existing radar vibration measurement methods do not have enough azimuth resolution for measuring the vibrations in a relatively large scene, which contains multiple buildings or a large building. For such application scene, this paper proposes a vibration measurement method based on multiple-input multiple-output imaging radar system, which can achieve high azimuth resolution. Features of the proposed method are threefold: first of all, by utilizing the ability of quickly acquiring imaging data, the proposed method can achieve vibration measurement for the entire area simultaneously; second, in order to detect the positions of vibrating objects and decrease the time of vibration parameter estimation part, this paper proposes vibration similarity index to quantify the similarity between the detected signal and ideal vibration signal; at last, due to the limitations of the hardware performance, this paper adopts multiple signal classification least-squares estimation method to estimate the vibrating frequency and amplitude. To evaluate the performance of the proposed method, ideal point target simulation and vibrating calibrator experiment have been conducted, and the results show that the positions and the vibrating parameters of the vibrating objects fit well with the reference values. In addition, car experiment and bridge experiment have been carried out to verify the ability of the proposed method to measure the vibration of real artificial structures, which cannot be seen as point targets.

中文翻译：

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基于MIMO成像雷达的人工结构振动测量方法

测量人工结构的振动状态是监测结构稳定性的重要方法。然而，现有的雷达振动测量方法没有足够的方位分辨率来测量包含多个建筑物或大型建筑物的较大场景中的振动。针对此类应用场景，本文提出了一种基于多输入多输出成像雷达系统的振动测量方法，可实现高方位分辨率。该方法的特点有三个：首先，该方法利用快速获取成像数据的能力，可以同时实现整个区域的振动测量；第二，为了检测振动物体的位置，减少振动参数估计部分的时间，提出了振动相似度指标来量化检测信号与理想振动信号的相似度；最后，由于硬件性能的限制，本文采用多信号分类最小二乘估计方法对振动频率和幅度进行估计。为了评估该方法的性能，进行了理想点目标模拟和振动校准器实验，结果表明振动物体的位置和振动参数与参考值吻合良好。此外，还进行了汽车实验和桥梁实验，以验证所提出的方法能够测量真实人工结构的振动，这些人工结构不能被视为点目标。