临近空间编队飞行合成孔径雷达数据仿真

Data simulation for near-space formation flying SAR

真实合成孔径雷达(SAR)数据的稀缺严重限制了临近空间编队飞行SAR的研究进展,为此,对SAR数据的仿真进行了研究。针对临近空间编队飞行SAR大天线视角的情况,分析了其空地几何关系,提出了能够完全描述其空间几何关系的九坐标系框架,以及每个坐标系的具体定义。根据临近空间编队飞行SAR的信号数学模型,针对空地全链路各环节的误差,提出了能够全面反映临近空间编队飞行SAR工作物理过程的回波数据仿真方法。数字仿真结果验证了该方法的有效性,可以为临近空间编队飞行SAR的研究提供可靠的数据源。

The lack of real synthetic aperture radar（SAR）data greatly limits the research of near space formation flying SAR. This paper therefore investigates the SAR data simulation. The air-ground geometry for near space formation flying SAR under large antenna look angle is presented. In order to depict this geometry completely, framework of nine coordinates is proposed with their definition respectively. Errors of echo in the air-ground link are analyzed according to mathematical model of near space format SAR signal. A simulation method which can reflect the physical process of near space formation flying SAR operation completely is proposed. The simulation experiments validates the effectiveness of this approach.