摘要
设计了悬臂梁振动引起的微多普勒频移实验系统.采用10.525GHz的X波段雷达模块发射和接收电磁波,采用AD620放大雷达回波毫伏级信号,采用NI-6009数据采集模块与LabVIEW软件对回波信号采集、滤波、加窗和频谱分析,采用压电传感器验证雷达测频结果.实验结果表明:悬臂梁的有阻尼自由振荡对雷达波产生频率调制作用,其微多普勒频谱图由相邻间距为固有频率的谱线对构成.
A micro-Doppler frequency shift test system caused by the vibration of the cantilever beam was developed.The 10.525 GHz X band radar module was used to radiate the electromagnetic wave and receive the echo wave,and the radar echo signal was amplified by the AD620 amplifier.The echo signal was collected,filtered,windowed and sampled by the NI-6009 data acquisition module and LabVIEW.The frequency measurement given by the radar was verified by apiezoelectric sensor.The experimental results showed that the radio echo signal frequency was modulated by the damping free vibration of the cantilever beam,and its micro-Doppler spectrum was composed of a pair of spectral lines with adjacent space of natural frequency.
作者
孙玉国
吴立鑫
SUN Yu-guo, WU Li-xin(School of Optical -Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, Chin)
出处
《物理实验》
2018年第8期6-8,共3页
Physics Experimentation
基金
上海市教委科研基金资助(No.06EZ018)
关键词
微多普勒效应
目标振动
特征识别
X波段雷达
micro- Doppler effect
target vibration
feature recognition
X band radar
