平面波激励下的二维衍射层析成像算法仿真

Simulation for Two-Dimensional Diffraction Tomography Imaging Algorithm Under Plane Wave Illumination

以一阶Born近似和格林函数的平面波谱展开为基础,导出了平面波激励情况下的二维衍射层析成像算法并给出了详细的算法处理流程。在此基础上分析了散射场信号的信噪比和有耗媒质的衰减效应对成像结果的影响,并对多个仿真数据进行了成像处理。结果表明,该成像算法可以精确反演出目标的形状和电磁参数,可应用于雷达成像和目标识别。

Based on the first order Born approximation and the plane wave expansion of the Green function in two-dimensional （2-D） scattering problem under the plane wave illumination, a 2 D diffraction tomography （DT） imaging algorithm is presented. Two important factors affecting the imaging quality for signal noise ratio （SNR） of the scattering signal and the attenuation effect of the background medium, are analyzed. By processing several object scattering signals obtained by FDTD simulation, results show that the imaging algorithm is used for the radar imaging and the object recognition.