逆合成孔径雷达运动补偿中一种包络对齐新方法

A new envelope alignment method for ISAR motion compensation

逆合成孔径雷达(ISAR)成像中,包络对齐是初相校正和图像重构的基础。基于刚体模型的包络相关法对具有大动态范围的回波处理时对齐效果较差,针对这一问题,本文提出了一种基于自适应幂变换的相关包络对齐新方法,对齐质量明显提高,大量实测数据验证了该方法的有效性。

Envelope alignment is the base in ISAR imaging, conventional envelope correlation method is widely used, however, this method require that the target must be rigid, when the target has a sub_echo that changes quickly, the range profiles are not similar any more, this method can not work well. For this reason, a new envelope correlation method based on adaptive power transformation is proposed, power transformation is used to reduce the variational scope of the amplitude of range profiles, then the range profiles are become similar. Using this method the range bin can be aligned correctly, which is verified by real radar data.