基于电偶极子辐射模型的三维成像算法

摘要

提出了一种基于电偶极子辐射模型的三维成像算法.在研究后向投影算法原理的基础上,利用散射模型分析了近、远场成像的关系,提出先采用电偶极子辐射模型对采样数据进行近场化处理,再将处理后的数据反向投影到成像区域,获得成像图像.利用FDTD数值仿真实现对目标的三维成像,验证了算法的有效性,分析了耦合对成像效果的影响.%A three - dimensional imaging algorithm based on the radiation model of dipole ( DBP) is presented. On the foundation of researching the principle of the back projection ( BP) algorithm, the relationship between the near field imaging model and far field imaging model is analyzed based on the scattering model. Firstly, the far field sampling data is transferred to the near field sampling data through applying the radiation theory of dipole. Then the dealt sampling data was projected to the imaging region to obtain the images of targets. The capability of the new algorithm to detect targets is verified by using finite - difference time - domain method (FDTD) , and the coupling effect for imaging is analyzed.