基于FPGA的线性调频雷达信号产生与数据采集的设计与实现

线性调频雷达是一种通过对连续波进行频率调制来获得距离与速度信息的雷达体制。该文介绍了一种由FPGA控制实现的线性调频雷达信号的产生与数据采集系统。AD5542A产生三角波调制信号,采用数字的方法实现了对雷达前端VCO非线性的校正。AD7655实现数据的转换与采集,通过USB接口将数据保存至计算机。系统的控制与同步由FPGA完成,如此设计可以实现可控的调制信号频率和AD采样率,从而可以更加有效地提取雷达回波信号中的距离速度信息。

Signal Generation and Data Acquisition Design of Chirp Radar Based on FPGA

Chirp radar is a radar system that achieves distance and speed information by modulating frequency of continuous wave.A system implemented by FPGA to generate and acquire LFM radar signal is proposed here.The original triangular wave modulation signal was generated by AD5542A,and a digital method was used to achieve the correction of radar front-end VCO nonlinear.Data converting and collecting was implemented by another chip AD7655,and finally be stored into PC through USB interface.Systematic controlling and synchronizing was completed by FPGA,The design can achieve controllable modulation signal frequency and AD sampling rate,so as to extract radar echo signals more effectively from speed information.