Backscatter from a Moving Target in a Randomly Fluctuating Slab (Application to a Vegetated Environment)

摘要

The stochastic nature of the target return depends on numerous factors: the spatial randomness of the forest's EM parameters, their temporal fluctuations, the target size and its state of motion. Attention is focused upon the calculation of the mean power and the temporal spectrum of the target return, quantities of direct and obvious relevance. The spectral modifications are traceable to two first order factors: (1) the motion of the scattering centers within the random vegetation slab and (2) the target motion through a randomly inhomogeneous field, with the latter likely to dominate. The analysis is carried out within the framework of the so-called 'distorted wave Born approximation.' The incoherent (random) scattering is accounted for to the order of single scatter, while coherent (background) effects such as refraction at the air-vegetation interface and ground reflections are properly considered. (Author)