Figure 3.

Scheme of the complex results of range-FFT processing in K ramps, consisting of clutter and one moving pedestrian at one rth range-bin: $f_D$ is the detected Doppler-frequency by the radial velocity of the pedestrian, $\Delta {\mathsf{\phi }}_c$ is the constant initial phase of clutter, and $\Delta {\mathsf{\phi }}_m$ is the coherent phase difference of the pedestrian.