Abstract:

According to the problem of ranging error of the frequency modulated continuous wave (FMCW) radar is mainly from nonlinear modulate slope, a ranging method combining discrete bi-orthogonal Fourier transform (DBFT) algorithm with close-loop control circuits is proposed to realize high accuracy ranging. The method first obtains the segment of the nonlinear FMCW radar by segmentation lower frequency, then analyzes the modulated slope by DBFT, and chronologically creates correction curve, finally real time corrects the nonlinearity by closed loop control. The result shows that the modulation slope linearity error is down to 0.27%, and the ranging error reduced by 87%.