面向结构健康监测的小型多普勒雷达系统设计

A miniature Doppler radar system design for structural health monitoring

直流电压的校准是直接下变频多普勒雷达准确探测振动的难点之一。介绍了一种用于结构健康监测的直流耦合多普勒雷达传感系统,具有自适应DC校准和实时分析预警功能。通过对基带输出信号进行监测,自适应调整反馈电压,有效放大有用信号,避免输出饱和;基于LabVIEW软件,通过搭建拓展的DACM算法架构和预警模块,实现了信号的实时解调和分析处理。实验结果表明,该传感器系统的功耗小于10 W,能够进行毫米级振动的探测,探测范围可达200 m。为了检验系统的分析预警功能,人为引入损伤异常数据,仿真结果显示假阳性发生概率低于1%,未发现假阴性情况的发生。

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.