Numerical and analytical solutions for the backscattered pulse shape from a slab of random medium are given based on the cumulative forward-scatter single-backscatter (CFSB) approximation given by deWolf, assuming small angular-spread and a narrow-band incident pulse. The analytic solutions for asymptotic limits for extreme small-angle scattering are also obtained. The results are applicable to both discrete media with large particles and continuous media with a large scale of turbulence.
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