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
参考文献
[1] 姚京川. 高速铁路常用跨简支箱梁运营性能检定[j]. 中国铁道科学, 2017, 38(2): 34-41
[2] monserrat o, crosetto m, luzi g. a review of ground-based sar interferometry for deformation measurement[j]. isprs journal of photogrammetry and remote sensing, 2014, 93: 40-48
[3] leva d, nico g, tarchi d, et al. temporal analysis of a landslide by means of a ground-based sar interferometer[j]. ieee transactions on geoscience & remote sensing, 2003, 41(4): 745-752
[4] gentile c, bernardini g. an interferometric radar for non-contact measurement of deflections on civil engineering structures: laboratory and full-scale tests[j]. structure and infrastructure engineering, 2010, 6(5): 521-534
[5] farina p, leoni l, babboni f, et al. ibis-m, an innovative radar for monitoring slopes in open-pit mines[c]// proceedings of international symposium on rock slope stability in open pit mining and civil engineering, 2011.
[6] roedelsperger s, coccia a, vicente d, et al. the novel fastgbsar sensor: deformation monitoring for dike failure prediction[c]// conference proceedings of 2013 asia-pacific conference on synthetic aperture radar (apsar), 2013: 420-423.
[7] strozzi t, werner c, wiesmann a, et al. topography mapping with a portable real-aperture radar interferometer[j]. ieee geoscience and remote sensing letters, 2012, 9(2): 277-281
[8] guido l, michele c, fernández enric. radar interferometry for monitoring the vibration characteristics of buildings and civil structures: recent case studies in spain[j]. sensors, 2017, 17(4): 669
[9] gentile c. deflection measurement on vibrating stay cables by non-contact microwave interferometer[j]. ndt & e international, 2010, 43(3): 231-240
[10] tarchi d, rudolf h, luzi g, et al. sar interferometry for structural changes detection: a demonstration test on a dam[c]// ieee 1999 international geoscience and remote sensing symposium, 1999.
[11] casagli n, catani f, ventisette c, et al. monitoring, prediction, and early warning using ground-based radar interferometry[j]. landslides, 2010, 7(3): 291-301
[12] huang q, wang y, luzi g, et al. ground-based radar interferometry for monitoring the dynamic performance of a multitrack steel truss high-speed railway bridge[j]. remote sensing, 2020, 12(16): 2594
[13] 陈思彤, 邵益, 刘伟, 等. 基于地基雷达的高铁桥梁运营动态形变监测[j]. 科技创新与应用, 2020(17): 33-35
[14] 刘小阳, 孙广通, 李峰, 等. 基于地基雷达的高铁简支箱梁运营性能检定[j]. 中国铁道科学, 2020, 41(1): 50-56
[15] 胡礼军, 吴蓉, 黄炎阶, 等. 基于微波干涉技术的杆塔形变及导线舞动幅值监测研究[j/ol]. 中国测试: 1-6[2021-09-27]. http://kns.cnki.net/kcms/detail/51.1714.tb.20210529.2025.006.html.
[16] 李俊慧. 基于sfcw的gb-insar形变监测技术研究[d]. 成都: 电子科技大学, 2016.
[17] 陈伟民, 李存龙. 基于微波雷达的位移/距离测量技术[j]. 电子测量与仪器学报, 2015, 29(9): 1251-1265
[18] 邵泽龙. 基于fmcw gbsar的微形变监测技术研究[d]. 北京: 中国科学院大学(中国科学院国家空间科学中心), 2019.
[19] 邵泽龙, 张祥坤, 李迎松, 等. 基于微波干涉雷达的悬索桥振动监测[j]. 现代电子技术, 2019, 42(16): 140-143 148
[20] 孟鑫, 刘鹏辉, 姚京川, 等. 高速铁路32m简支箱梁动力特性试验分析[j]. 铁道建筑, 2016(1): 10-15
[21] 夏禾, 张楠, 郭薇薇等. 车桥耦合振动工程[m]. 北京: 科学出版社, 2014.
