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 nonlinear correction of the sawtooth wave modulation signal; radar beat signal acquisition and build a second-order active bandpass 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.