一类亚像素分辨的包络对齐方法

包络对齐是逆合成孔径雷达(ISAR)运动补偿的基础,现有的包络对齐方法普遍存在对齐精度低和运算时间长的缺点。本文在最大相关法包络粗对齐的基础上,采用最大相关系数,运用二次估值与遍历/搜索算法确定精细偏移量。这些方法具有更高的对齐精度。采用相关系数的快速算法,新方法运算速度相比传统最大相关法差别不大。外场实测数据的处理结果表明这些方法的有效性。

A Type of Envelop Correlation Algorithm with Sub-Pixel Resolution

Range alignment is the key of inverse synthetic aperture radar(ISAR)motion compensation.The accuracy of those conventional range alignment algorithms is limited by the ISAR range resolution and the operation speed is slow.On the base of envelop correlation method,the rule of Maximum correlation coefficient is proposed,secondary estimate value and all-over search are used to con- finn the refined offset.These methods have the more alignment accuracy.When the Maximum correlation celerity algorithm is used,these new methods are not slow than the traditional envelop correlation method.The real ISAR data is used to demonstrate their effectiveness.