基于二次散射的舰船目标SAR图像仿真

SAR Image Simulation of Ship Targets Based on Double-Bounce Reflection

基于合成孔径雷达(SAR)的工作过程,对舰船目标进行基于回波信号的SAR成像仿真。目标建模时采用小面单元模型,将建好的精细舰船3D模型,根据SAR系统参数和分辨率要求划分为小面单元,然后对面元进行散射截面的计算。在计算目标散射截面时,结合射线追踪法充分考虑了目标的一次散射,二次散射效应,使仿真图像更加符合真实的SAR图像特征。根据面元散射截面和位置信息,结合雷达工作过程,生成回波。再运用RD成像算法处理回波,得到最终的仿真图像。将实验仿真图像与真实SAR图像对比,验证文中仿真方法的合理性。

Based on the synthetic aperture radar（SAR）working process,the SAR imaging simulation of ship targets is made by use of the echo signals.The precise 3Dship model is divided into facets according to the SAR system parameters and resolution.When calculating the RCS,single reflection and double-bounce reflection are both considered in combination with ray tracing method.Combined with the radar working process,echo signals are generated according to the surface scattering cross section and the location information.The echo signals are processed by the RD algorithm to achieve imaging simulation.The simulation images are compared with the real SAR images to verify the effectiveness of the simulation method.