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电子学报  2013 

基于稀疏约束最优化的ISAR相位自聚焦成像算法

DOI: 10.3969/j.issn.0372-2112.2013.09.016, PP. 1772-1777

Keywords: 逆合成孔径雷达,稀疏孔径,自聚焦,稀疏约束

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Abstract:

本文提出了一种基于稀疏约束的ISAR方位自聚焦算法,能够应用于稀疏孔径ISAR成像中.该算法利用ISAR图像的稀疏特征建立最小1范数成像模型,并将相位误差作为模型误差.然后通过数值迭代的方式进行自适应相位误差估计,最终获得聚焦良好的ISAR图像.同时,成像代价函数的建立基于矩阵模型,有利于采用方位FFT和矩阵的Hardmard乘积操作进行快速求解.由于利用稀疏约束,该方法在低信噪比的条件下仍然能够取得良好的聚焦结果.基于仿真数据和实测数据的结果验证了本文算法的有效性.

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