Figure 3

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a) Response of the suggested cascaded all-pass filter (black) for surface scattering. The distance was R = 10 m (Ts = 0.2 s). The red trace shows the respective exponential decay. b) Modified all-pass cascade filter for object scattering (black) with a group delay of 20 ms. The red trace shows the roughly approximated Gamma distribution function with shape parameter k = 3 and scale parameter θ = 2γ/5.

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