基于CSI-ISAR的非合作目标成像技术

Non-cooperative target imaging technology based on CSI-ISAR method

合成孔径雷达(SAR)针对静止目标成像,依靠雷达平台的运动形成较长的合成孔径,达到方位高分辨。而在地面静止场景中,必然会存在运动目标,其运动参数的未知使得目标在SAR图像上难以聚焦成像。另一方面,逆合成孔径雷达(ISAR)技术在雷达平台静止条件下,依靠目标运动形成长合成孔径后聚焦成像。本文将结合多通道合成孔径雷达-地面动目标指标(SAR-GMTI)技术,提出了基于杂波抑制干涉(CSI)和ISAR相结合的非合作动目标聚焦成像。成像过程中,利用多通道图像信息,动目标在CSI处理后被检测到,针对动目标的能量范围进行ISAR处理,实现该区域内动目标的聚焦成像。最后仿真结果验证了该方法的有效性。

Synthetic aperture radar(SAR)utilizes relative motion between the radar platforms and targets to form long aperture,which is designed for static targets and finally obtain high resolution images.There are moving targets in the ground stationary scene.Since the motion parameters are unknown,the moving targets are hardly focused in SAR image.On the other hand,inverse synthetic aperture radar(ISAR)technology has been known that moving targets can be focused depending on the motion of targets and static radar platform.The work of this paper combines the multichannel SAR-GMTI technology and come up with the image of non-cooperative moving target based on clutter suppression interference(CSI)and ISAR.And meanwhile moving targets are detected after CSI processing before ISAR processing which picks the main energy area of the targets.At the end of the paper,simulation results prove the effectiveness of the chain and success of moving targets defocus.