对于合成孔径雷达(SAR)图像,地面静止场景中同时存在运动目标;由于其运动参数未知,动目标在SAR图像上呈现方位向偏移和散焦;而在高分辨条件下,运动目标更可能会存在跨距离单元徙动现象,从而影响运动目标的聚焦成像。文中结合多通道合成孔径雷达-地面动目标显示技术,提出了基于杂波抑制干涉(CSI)和子视图相关法(MD)的动目标聚焦成像技术。该方法结合多通道SAR图像信息,在CSI抑制杂波后进行动目标检测,根据动目标散焦范围挑出包含动目标的区域;然后,用MD算法估计动目标所在距离单元的方位调频率,重新设计方位匹配滤波函数,对该区域内散焦的运动目标聚焦成像。仿真数据和实测数据的处理结果均证明了该方法能较好地实现动目标的聚焦成像。

For synthetic aperture radar (SAR) images, there are moving targets in the ground stationary scene. Since the motion parameters are unknown, the moving target shows azimuthal deviation and defocus in SAR image. Under the condition of the high resolution, the moving target is more likely to have cross-range cell migration phenomenon so as to affect the result. Imaging technology of moving targets, based on clutter suppression interferometry (CSI) and map drift(MD), is proposed in this paper by combining multichannel synthetic aperture radar-ground moving target indication technology. The algorithm, making use of multichannel SAR image information, detects the moving targets and selects the region which includes the targets after CSI. And then the azimuth frequency rate of moving rargets is estimated by MD algorithm. Consequentely, the defocused moving rargets are focused by redesigning the azimuthal matching filter. The results of simulation data and measured data show that this method can realize the focus imaging of moving target better.

TN957.51