全极化SAR半实物仿真系统

在微波暗室内构建了一种全极化合成孔径雷达(synthetic aperture radar, SAR)半实物仿真系统。系统利用可移动的取样架模拟SAR的飞行轨迹，矢量网络分析仪作为核心仪表放置于取样架上一起运动。矢量网络分析仪的双通道经过扩展端口分别连接到两路垂直和两路水平极化的天线上，在取样架移动的过程中，可一次性获取目标的全极化散射矩阵测试数据。通过改进的滤波〖CD*2〗逆投影算法进行信号处理，获得了目标全极化二维图像。实验给出了L波段和C波段的场景测量及成像结果，通过处理得到的图像分辨率优于0.2 m，并且成像结果与场景的物理特征相一致，验证了该系统的可行性。

Full-polarization synthetic aperture radar hard-in-loop system

A full polarization synthetic aperture radar (SAR) hard in loop system is constructed in an anechoic chamber. The operation track of SAR is simulated by lateral movement of a scanner. As the core hardware of system, a vector network analyzer is set in the scanner and moved together. Two measured channels are connected with four vertical or horizontal antennas by the expand ports. Then the full polarization scattering matrixes are gotten with the scanner moving. For processing the stepped frequency signals in the system, an improved back projection algorithm is adopted, and four different polarization images are gained. The experiments are carried out on L band and C band respectively. The resolution of images after processing is more than 0.2 m, and the images are coincident with the physical characteristic of scene. The results show that the system is feasible to engineering.