Page 341 - Fundamentals of Radar Signal Processing

deviation of σ = 0.05 on a normalized frequency scale; i.e., the standard
f
deviation is 5 percent of the full width of the principal period of the spectrum.
Also shown are the outputs from the two- and three-pulse cancellers. The power
in the two-pulse canceller output has been reduced by 13.4 dB relative to the
unfiltered clutter sequence. For the three-pulse canceller, the reduction is 21.9
dB.

FIGURE 5.10 Clutter cancellation using two-and three-pulse cancellers. See
text for details.

The idea of cascading two-pulse canceller sections to obtain higher order
filters can be extended to the N-pulse canceller obtained by cascading N – 1

two-pulse canceller sections. The transfer function of the N-pulse canceller is
therefore

(5.3)

The corresponding impulse response coefficients of the filter are given by the
binomial series

(5.4)

Other types of digital highpass filters could also be designed for MTI