高空高速平台合成孔径雷达(SAR)成像具有大俯冲大前斜的复杂几何构型,给成像参数特别是信号带宽与合成孔径时间的设计带来较大难度。文中在建立通用的SAR 成像几何模型的基础上,分析了斜平面与地平面分辨椭圆的映射关系,从而将参数设计问题转化为一个单变量最优化问题,得出了从地平面分辨率指标出发,设计斜平面信号带宽与回波采集时间的数学表示,理论分析和仿真实验证实了所提方法的有效性。

System geometry of high altitude high speed airborne synthetic aperture radar (SAR) is often in diving condition and highly squinted, which complicates the SAR parameter design especially for the signal bandwidth and synthetic aperture time. In this paper,diving squinted SAR geometric model is constructed, mapping relation of imaging plane and ground plane is analyzed, a single variate optimal model is established from the parameter design problem, and signal bandwidth and echo acquisition time are deduced from ground plane resolution specification. Theory analysis and simulation result verify the effectiveness of the proposed method.

TN957. 51