基于距离走动校正的星载SAR成像算法
doi: 10.3724/SP.J.1146.2006.01085
An Imaging Algorithm for Space-borne SAR Based on Range Walk Correction
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摘要: 该文提出一种适合大距离徙动星载SAR的成像算法，该算法首先要对回波信号的距离走动进行校正，因而距离向和方位向的耦合度大大减小，成像质量得到提高。文中详细地推导出了该算法。然后对距离多普勒域的调频斜率的近似误差进行了分析，并与普通的斜视算法进行了比较。最后通过点目标成像仿真和实际数据成像仿真，验证了该算法的有效性。Abstract: In this paper, an algorithm is proposed to resolve the precise imaging problem of space-borne SAR with large cell migration. This algorithm is derived in detail based on the squinted equivalent range model. A distinct difference from other algorithms is that this algorithm begins with range walk correction in the time domain, which obviously reduces the coupling between range and azimuth signal. This algorithm is compared with a common squint mode chirp scaling algorithm through the computer simulation, and the result shows that the imaging method presented in this paper is effective.
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