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基于修正斜距模型的GEO SAR远地点的CS成像算法

Keywords: 地球同步轨道合成孔径雷达,速度空变性,Chirp,Scaling算法

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Abstract:

针对地球同步轨道SAR(GEOSAR)卫星的轨道曲率大,若使用传统直线斜距模型,将不能正确地描述卫星处于远地点时场景目标的“近远近”斜距历程,建立了一种曲率为负的修正斜距模型.该模型能够准确地描述远地点目标的斜距历程;基于该修正的斜距模型精确地推导了GEOSAR远地点回波信号的二维频谱表达式,并给出了一种适用于GEOSAR远地点成像的修正CS成像算法;在方位向成像处理时补偿随距离线性变化速度引起的空变相位,实现GEOSAR较宽的成像幅宽的聚焦处理.并通过场景尺寸为100km×100km点阵的GEOSAR成像处理,验证了该基于修正斜距模型的CS成像算法的有效性.

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