用条带SAR数据对低空运动目标聚束成像新方法

将条带SAR的广域搜索能力和聚束SAR运算量小的优点结合起来,提出了基于条带SAR数据进行低空运动目标聚束成像的新方法。该方法首先以条带模式收集数据进行地(海)杂波抑制后,找到可能存在运动目标的重点区域,继而作距离向压缩,对运动目标进行包络对齐,然后选取可能有运动目标的重点区域,将条带数据转换为聚束数据,最后对得到的聚束数据进行成像场景中心的运动补偿,完成对运动目标的成像。通过计算机仿真,验证了该方法的有效性。

Method of imaging low-altitude moving target with spotlight mode based on stripmap SAR data

A new method of imaging low-altitude moving target with spotlight SAR based on stripmap SAR data is presented, which combines the wide area searching ability in stripmap SAR mode with advantage of less computation load in spotlight SAR. Firstly, after the ground (sea) clutter in strip map SAR data is suppressed, the moving target possible appearing area is found, and the range compression is finished, then the moving target is aligned in envelope. Secondly, to the moving target possible appearing area, the stripmap SAR data is transformed into the spotlight SAR data. Thirdly, to the spotlight data being transformed, the moving target imaging is completed after the motion compensation to the imaging scene center is done. Simulation has verified the validity of this method. ;