作者：高卓妍1,2, 贾岩1,2, 刘淑一1,2, 张祥坤1,2
作者单位：1. 中国科学院国家空间科学中心 中国科学院微波遥感技术重点实验室，北京 100190;
2. 中国科学院大学电子电气与通信工程学院，北京 100049
关键词：地基干涉雷达;步进频连续波;调频连续波;简支箱梁;车桥耦合振动;动挠度
摘要：
传统的高铁车桥耦合振动监测手段为位移计、加速度计、倾角仪等接触式测量手段，存在安装困难、工作效率低等缺点。地基干涉雷达是非接触式测量手段，体积小、安装灵活，可作为传统监测手段的一种有效补充。基于矢量网络分析仪（vector network analyzer, VNA）搭建一套Ku频段的步进频连续波（stepped frequency continuous wave, SFCW）干涉雷达，与自主研发的Ka频段的调频连续波（frequency modulated continuous wave, FMCW）干涉雷达对比验证该系统微形变监测的可行性。实验对象为盐通高铁的32 m简支箱梁，实验用车为和谐号16节重联列车，运行速度为250 km/h。实验结果表明，两套雷达系统的动挠度测量结果相差0.013 mm，实测精度达亚毫米级。SFCW干涉雷达可以20 Hz的采样频率准确地测量桥梁的自振频率和强振频率，频谱测量精度达0.1 Hz，且SFCW干涉雷达的信噪比更高。
Experimental study of SFCW interferometry radar applied to vehicle-bridge coupling vibration monitoring of high-speed railway bridge
GAO Zhuoyan1,2, JIA Yan1,2, LIU Shuyi1,2, ZHANG Xiangkun1,2
1. Key Lab of Microwave Remote Sensing, National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China;
2. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
Abstract: Traditional vehicle-bridge coupling vibration monitoring methods for high-speed railway include displacement meter, accelerometer, inclinometer and other contact measuring methods, which have disadvantages of difficult installation and low working efficiency. Ground-based interferometry radar is a non-contact measuring method, which is small in volume and flexible in installation, and can be used as an effective supplement to traditional monitoring methods. Based on vector network analyzer (VNA), a Ku-frequency stepped frequency continuous wave (SFCW) interferometry radar system is built. Cross experiment with the self-developed Ka-band frequency modulated continuous wave (FMCW) interferometry radar has been carried out to verify the feasibility of the micro-deformation monitoring. The experimental object is the 32 m simple box girder of Yancheng-Nantong High-speed Railway. The experimental vehicle is 16-carriage reconnect trains with a running speed of 250 km/h. The experimental results indicate that the difference between the dynamic deflection measurement results of the two radar systems is 0.013 mm, and the measured accuracy reaches sub-millimeter level. SFCW interferometry radar can accurately measure the natural frequency and forced frequency with PRF of 20 Hz, spectrum measurement accuracy reaches up to 0.1 Hz. Furthermore, the signal-to-noise ratio (SNR) of SFCW interferometry system is higher.
Keywords: ground-based interferometry radar;stepped frequency continuous wave;frequency modulated continuous wave;simply supported box girder;vehicle-bridge coupled vibration;dynamic deflection
2023, 49(3):135-141 收稿日期: 2021-05-19;收到修改稿日期: 2021-09-27
基金项目:
作者简介: 高卓妍(1995-),女,黑龙江哈尔滨市人,博士研究生,研究方向为雷达信号处理及其应用等
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