Phase difference detection equipment for FMCW modulation

The invention provides phase difference detection equipment for FMCW modulation, which is used for transmitting two paths of FMCW signals, one path of FMCW signals is output to a detected object through an amplifier, and the other path of FMCW signals is directly input to a frequency mixer of a receiving device. The frequency mixer performs down-conversion frequency mixing on the received two paths of signals and obtains a difference frequency signal through low-pass filtering, and the frequency of the difference frequency signal and the distance of a measured object form a linear relation. Through time domain-frequency domain conversion and certain compensation, the distance of the measured object can be accurately measured. Meanwhile, the phases of the difference frequency signals at different moments are measured through a phase analysis module, and weak deformation quantities generated at different moments can be obtained through conversion. The antenna devices of a transmitting device and a receiving dev