CW雷达多普勒测速实验教学装置设计

Experimental Device Design of CW Doppler Radar Velocity Measurement

摘要: 根据多普勒效应设计了一款连续波(Continuous Wave, CW)雷达测速实验装置。采用10.525 GHz X波段雷达收发模块接收回波信号，经混频器输出中频信号。利用仪用放大器AD620对中频信号进行放大，由16位数据采集板卡完成数据采集。采用快速傅里叶变换FFT识别中频信号频率，进而得到多普勒频率和目标径向运动速度。利用步进电机和丝杆螺母机构搭建了运动控制实验平台，实验结果表明低速目标径向运动速度测试误差小于1%。以期用于《大学物理》和《通信电子线路》等课程的实验教学演示。

Abstract: An experimental device for target speed measurement based on continuous radar’s Doppler effect was designed. The radar echo signal was collected by a radar transceiver with 10.525 GHz center frequency. The intermediate frequency (IF) signal was generated by a mixer and amplified by AD620, and the data acquisition of the IF signal was completed by 16-bit high precision ADC. The frequency of the IF signal was identified by Fast Fourier Transform (FFT); the Doppler frequency and target radial velocity were then obtained. An experimental platform was built by using the structure of stepping motor and screw nut. The experimental results show that the measurement error of target radial motion speed is less than 1%. The experimental device is expected to be used in the course teaching demonstration, such as College Physics and Communication Electronic Circuit.