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合成孔径雷达穿墙成像中的关键问题是对墙壁影响的补偿.而墙壁参数通常为先验未知量,获得其值后才能进行成像补偿.本文建立了正侧视条带工作模式的SAR信号穿墙传播的数学模型,研究解决了电磁波的折射和传播路径等问题.在分析回波时域结构的基础上,提出了一种基于高分辨一维距离像的墙壁参数估计新方法.通过对目标各部分回波延时的提取,采用方程数值解算和搜索曲线交汇的方法实现了对墙壁厚度和介电常数的准确估计.基于估计的参数值采用后向投影(BP)算法,得到对墙体的折射和延时作用补偿后的聚焦图像,仿真结果验证了理论分析和估计方法的正确性与有效性.
The key problem in synthetic aperture radar imaging is the compensation of the influence on the wall, while the wall parameters are usually a priori unknowns, and the imaging compensation can be achieved only after obtaining the values. Wall propagation of the mathematical model to study and solve the electromagnetic wave refraction and propagation paths and other issues.Analyzing the time-domain structure of the echo, based on the proposed high-resolution one-dimensional distance image based on a new wall parameter estimation method through the target Based on the estimated parameter values, back projection (BP) algorithm is used to get the wall-to-wall ratio of the wall The refraction and delay effects of the body are compensated for the focused images. The simulation results verify the correctness and validity of the theoretical analysis and estimation methods.