提出了一种应用于超宽带穿墙雷达的三维成像算法。在研究后向投影算法原理的基础上,构建了电磁波穿透介质墙的数学模型,补偿了电磁波在墙体中传播的时间延迟,推导了基于偶极子近场辐射模型的穿墙改进后向投影算法,给出了算法的实现流程。利用FDTD得到采样数据,运用算法的具体流程实现对介质墙存在下的目标进行三维成像。验证了算法的有效性,分析了墙体和目标间耦合作用对成像效果的影响。 A three-dimensional imaging algorithm for UWB radar is proposed. On the basis of studying the principle of backward projection algorithm, a mathematical model of the electromagnetic wave penetrating the dielectric wall is constructed to compensate the time delay of propagation of the electromagnetic wave in the wall, and the backward direction of the wall based on the dipole near-field radiation model is deduced Projection algorithm, given the algorithm implementation process. Using FDTD to get the sampling data, the specific process of the algorithm is used to realize the 3D imaging of the target in the presence of the media wall. The effectiveness of the algorithm is verified, and the effect of the coupling between the wall and the target on the imaging effect is analyzed.