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包络对齐是逆合成孔径雷达(ISAR)运动补偿的关键技术之一。利用相邻目标回波包络之间的高度相似性,该文提出了基于凸泛函准则的包络对齐算法的设计思想。理论分析表明,目前常用的互相关以及最小熵等包络对齐算法都可用该准则进行归结。在此基础上,进一步提出了一些其他类型的包络对齐算法。基于外场实测数据的处理结果表明,基于凸泛函准则的包络对齐算法能够较好地实现包络对齐,成像结果与互相关、最小熵方法相当,从而验证了这些包络对齐算法和凸泛函准则设计思想的有效性。
Envelope alignment is one of the key techniques of inverse synthetic aperture radar (ISAR) motion compensation. In this paper, the design idea of envelope alignment algorithm based on convex functional criterion is proposed by using the high similarity between adjacent target echo envelopes. Theoretical analysis shows that the commonly used algorithms such as cross-correlation and minimum entropy envelope alignment can be summarized by this criterion. On this basis, some other types of envelope alignment algorithms are further proposed. The experimental results based on field measurements show that the envelope alignment algorithm based on convex functional criterion can achieve envelope alignment well, the correlation between imaging results and cross-correlation, and the minimum entropy method are equivalent, which verifies these envelope alignment algorithms and convex- The validity of the letter criterion design idea.