【摘要】 距离对准是逆合成孔径雷达(ISAR)运动补偿的关键。本文提出了一种基于修正峰度的ISAR距离对准算法。首先对应用于离散信号序列的峰度定义进行了修正,然后以修正峰度衡量回波包络之间的对准程度,对距离偏移量进行搜索。当两回波和包络的修正峰度达到最大时,以此时的距离偏移量进行补偿,就可将回波对齐。分析表明该算法具有良好的抗闪烁性能和抗噪性能。实测ISAR数据验证了算法的有效性。结果表明,基于最大修正峰度的距离对准算法可以准确地估计出回波的距离偏移量,实现距离对准。更多还原

【Abstract】 Range alignment is crucial in motion compensation of the inverse synthetic aperture radar(ISAR).A new range alignment algorithm based on modified kurtosis is proposed.Firstly,the kurtosis definition applied to the discrete signal is modified.Then,the amount of the range shift between two echoes is searched by using the modified kurtosis as the alignment measure.When the modified kurtosis is maximized,the estimate of the range shift is obtained. The analysis shows that the algorithm has good anti-scintillation and anti-noise performances,and the real ISAR data processing demonstrates its effectiveness.Results show that the range alignment algorithm based on maximum modified kurtosis can estimate range shifts and fulfills range alignment.更多还原