The invention discloses a
linearity calibration method of a small depth-of-field linear frequency-modulated continues
wave radar. The
linearity calibration method comprises the following steps of 1, acquiring a medium-frequency
echo signal S'b(n) of a
metal plate target; 2, performing Fourier conversion and benchmark removal
processing on the S'b(n) according to a non-linear effect of each devicein the
radar system so as to obtain a phase jittering error c(n, Tau) caused by non-uniform
linearity, and accumulating the phase jittering error c(n, Tau) to complete
estimation of a non-linear erroritem Xi (n, Tau); 3, correcting a medium-frequency
echo signal Sb(n) of a tested target to be calibrated according to the non-linear error item Xi (n, Tau) so as to obtain a corrected medium-frequency
echo signal Sb2(n); and 4, calibrating the corrected medium-frequency echo
signal Sb2(n) to obtain a medium-frequency echo
signal Sb4(n), and completing linearity calibration. By the linearity calibration method, non-linear calibration of medium-frequency echoes of all targets in a distance direction can be accurately and effectively completed, and the detection resolution and the detection capability of the
radar distance direction are improved.