A New LASAR Fast 3-D Imaging Method via Wavelet Approximation

In this paper, we present a fast 3-D imaging method for linear antenna synthetic aperture radar (LASAR). The basic idea of this technique is to consider the 3-D SAR imaging problem as tracing a surface in the observation region, since a great deal of 3-D image region contains no scatterer (such as atmosphere) or is shadowed by the other scatterers. The steps of the fast 3-D imaging method includes: Initiation, prediction, searching and recursion. Finally, some numerical experiments are presented to demonstrate the feasibility of this method. And we find that the computational cost of the fast 3-D imaging method varies according to the fluctuation of ground, and is about a dozen of times larger than that of 2-D BP algorithm.