基于斜视模式合成孔径雷达(SAR)平台运动特点和波束照射规律,建立了机载SAR斜视模式的空间几何模型,考虑了斜视模式下天线半功率波束角与斜视角交叠所引起合成孔径长度的非对称性,详细推导了斜视模式下合成孔径长度的精确计算式。分析了各因素对斜视下合成孔径长度的影响机理,比较了相同探测距离、自然距离下正侧视和斜视模式合成孔径长度的关系,以及近似计算的条件,最后给出了计算机仿真结果。

Based on the motion of the platform and the scanning rules of squint SAR,this paper constructed a geometry model of air-borne SAR in squint mode.Exact expression of the length of synthetic aperture in squint mode is derived by considering the asymmetry of synthetic aperture caused by the overlap between squint angle and beam width.The mechanism of the effect of length of synthetic aperture in squint mode was analyzed,and the difference of the length of synthetic aperture between right side-looking mode and squint mode,for the same detection range and natural distance,is compared.The approximation condition was summarized and the simulation result are presented.

TN958