LFMCW雷达的差频信号采集系统设计

Design of beat signal acquisition system for LFMCW radar

差频信号采集系统是线性调频连续波(LFMCW)雷达的核心部件之一。针对国产某新型LFMCW雷达传感器,设计并实现了基于C8051F120的LFMCW雷达差频信号采集系统,包括调制信号产生模块、差频信号采集模块以及串口通信模块。主要实现的功能有:产生非线性校正后的锯齿波调制信号;采集雷达差频信号并搭建二阶有源带通滤波器进行放大滤波;发送差频信号至上位机等。实验验证了LFMCW雷达差频信号采集系统的有效性。

Beat signal acquisition system is one of the core components of linear frequency modulated continuous wave（LFMCW） radar. A LFMCW radar beat signal acquisition system based on C8051F120 is designed and implemented for a new LFMCW radar sensor, which includes modulation signal generation module, beat signal acquisition module and serial communication module. It can complete the functions such as the generation of non- linear correction of the sawtooth wave modulation signal;radar beat signal acquisition and build a second-order active baudpass filter for amplification ; sending beat signal to the host computer and so on. The experimental results verify the effectiveness of the LFMCW radar beat signal acquisition system.