Wide Range and Accurate Displacement Measurement Technique Using FMCW Radar

The displacement measurement technique based on FMCW radar has shown great application potential. However, the measurement range of the existing method is limited by the range resolution of radar. This letter proposes a phase compensation method to realize the wide range and accurate displacement measurement across multiple range bins. It works by demodulating the baseband signal by using the estimated distance of the target at different times to eliminate the additional phase modulation caused by the target crossing the range bins. Simulation and experiments demonstrate that the proposed method can accurately extract the wide-range displacement.