中圖分類號(hào)： TN958 文獻(xiàn)標(biāo)識(shí)碼： A DOI：10.16157/j.issn.0258-7998.222756 中文引用格式： 馬偉，崔海濤，朱曉曼，等.面向結(jié)構(gòu)健康監(jiān)測的小型多普勒雷達(dá)系統(tǒng)設(shè)計(jì)[J].電子技術(shù)應(yīng)用，2022，48(10)：150-155. 英文引用格式： Ma Wei, Cui Haitao, Zhu Xiaoman,et al. A miniature Doppler radar system design for structural health monitoring[J]. Application of Electronic Technique，2022，48(10)：150-155.
A miniature Doppler radar system design for structural health monitoring
Ma Wei1,2, Cui Haitao1, Zhu Xiaoman1, Hu Changzheng1, Hu Weibo1,2
1.College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China; 2.Nankai University Shenzhen Graduate School, Shenzhen 518063, China
Abstract： One challenge of direct-conversion Doppler radar for accuracy vibration motion detection is the DC voltage presented in the receiving channel. This paper introduces a DC coupled Doppler radar system for structural health monitoring with adaptive DC calibration and real-time analysis and warning functions. By monitoring the baseband output signals, the feedback voltage can be adjusted adaptively to effectively amplify the useful signal and avoid saturation. Based on the LabVIEW, an extended DACM algorithm and an early warning module are built for real-time signal demodulation, analysis and early warning functions. Experimental results show that the total power consumption of the sensor system is less than 10 W. It realizes an excellent resolution of millimeter-scale vibration and the detection range is up to 200 m. Furthermore, the analysis and warning functions are also verified by introducing artificial abnormal damage data. The results show that the probability of false positive was less than 1%, and no false negative was found.
Key words : Doppler radar; DC coupling; vibration detection; structure health monitoring; extended DACM algorithm
