Starting at the time of the rising edge, the script
then computes an inverse discrete Fourier transform (IDFT)
on 20 ms of data from the right channel. The logarithmic
magnitude of the result is range-to-target. Coherent pulse-topulse
subtraction is used to reject stationary clutter by about
25 dB allowing the ranging mode to be used to observe only
moving targets. Ranging results for two walking pedestrians
are plotted as a RTI plot (Fig. 8).