High Precision SAR Echo Simulation Based on FDTD Algorithm with Mobile Excitation Source

摘要

This paper presents a high-precision SAR echo simulation method, which calculates the electromagnetic field distribution of the target with the mobile excitation source using the finite-difference time-domain method (FDTD). Because the RCS of targets is different in different observation periods of different spatial angles, the visual points of targets are divided into continuous equidistant zones according to the relative positions between the target and the excitation source. Based on the near-to-far field extrapolation technology, the far-field values of the local targets are derived from the Huygens surface of the target surface, and the target SAR echo data are finally obtained. Simulation results of typical target show that the method proposed in this paper makes full use of the accuracy of FDTD calculation and truly reflects the backscattering characteristics of the target in different states.