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针对机载SAR转发式相参干扰效果图像中的干扰条纹,揭示了干扰条纹的形成规律,导出了条纹宽度、间隔以及斜率与干扰信号脉内特征之间的关系。系统分析了合成孔径雷达(SAR)转发式相参干扰原理,并建立相应的干扰时序模型。在分析SAR、干扰机对抗的空时关系的基础上,揭示了图像中干扰条纹的成因与规律:1)干扰机相对SAR处于大斜视位置;2)转发干扰信号的脉间时延大于SAR成像的聚焦深度;3)干扰条纹斜率随方位向处理视数的增加而加大。最后,给出了条纹宽度、间隔以及斜率等特征的解析表达式,并通过仿真实例验证了相关结论。
Aiming at the interference fringes in the airborne SAR coherent interference effect image, the formation rules of interference fringes are revealed, and the relationship between fringe width, interval and slope and the intra-pulse characteristics of interfering signals is derived. The principle of forward coherent interference of synthetic aperture radar (SAR) is systematically analyzed and a corresponding interference timing model is established. On the basis of analyzing the space-time relationship between SAR and jammer confrontation, the causes and rules of the interference fringes in the image are revealed: 1) the jammer relative to SAR is at a large strabismus position; 2) the pulse duration of the jamming signal is larger than the SAR imaging Of the depth of focus; 3) the interference fringes slope with azimuthal processing increased the number of visual increase. Finally, the analytical expressions of the fringe width, the interval and the slope are given, and the relevant conclusions are verified through simulation examples.