【作者】 吴艳； 林赟； 王彦平； 白泽朝； 李洋； 申文杰； 蒋雯；

【Author】 WU Yan;LIN Yun;WANG Yanping;BAI Zechao;LI Yang;SHEN Wenjie;JIANG Wen;North China University of Technology;

【机构】 北方工业大学；

【摘要】 用毫米波雷达监测振动是大型工程结构健康监测的一个重要手段,雷达监测振动具有非接触、高精度、全天时、全天候、可连续监测的优势。通常利用单通道雷达提取桥梁等工程结构的振动信号,但此类方法需要设置靶标,而且当多个目标在同一距离门上时,单通道雷达无法准确的区分并反演各个目标的形变量。在较少通道数的条件下,准确提取多个邻近振动目标的形变量是具有挑战的。本研究提出一种基于较少通道数的毫米波雷达,有效监测同距离门内邻近多目标的毫米级甚至亚毫米级振动形变的方法。该方法利用MUSIC算法突破雷达天线阵列的物理辨角极限,允许对雷达角分辨率内的多个目标进行精确定位,并通过构建的观测矩阵分离期望信号,反演获取振动形变。本文给出多通道雷达监测振动信号的信号模型,论述了方法原理和流程,并通过仿真实验对方法的可行性和有效性进行验证,结果显示出0.03-0.037°的角估计误差与0.0436mm的形变RMSE。更多还原

【Abstract】 Vibration monitoring using millimeter-wave radar serves as a critical tool in structural health monitoring(SHM) for large-scale engineering structures.Radar-based vibration monitoring offers distinct advantages such as non-contact measurement,high precision,all-day and all-weather operability,and the capability for continuous monitoring.Conventional methods for extracting vibration signals from engineering structures such as bridges often rely on single-channel radar systems.However,such approaches require the installation of cooperative targets(retroreflectors) and struggle to accurately distinguish and reconstruct the deformation of multiple targets when they fall within the same range gate.Under conditions with a limited number of channels,accurately extracting deformation signals from multiple closely spaced vibrating targets remains challenging.This study proposes a method based on a millimeter-wave radar with a limited number of channels to effectively monitor millimeter-level and even submillimeter-level vibration-induced deformations of multiple closely spaced targets within the same range gate.The approach employs the MUSIC algorithm to break the physical angular resolution limit of the radar antenna array,enabling precise localization of multiple targets within the radar’s angular resolution scope.By constructing an observation matrix,the desired signals are separated,allowing for the retrieval of vibration-induced deformations.This paper presents a signal model for vibration monitoring using a multi-channel radar,elucidates the underlying principles and procedural workflow of the proposed method,and validates its feasibility and effectiveness through simulation experiments.The results demonstrate an angular estimation error within the range of 0.03–0.037° and a deformation RMSE of 0.0436 mm.更多还原