一种海面舰船目标ISAR成像时间段选择方法

New ISAR imaging interval selection method for ship targets on the sea

针对海上舰船目标随海浪摇摆存在转动速度不稳定以及逆合成孔径雷达成像平面时变问题,文中详细分析了成像平面与舰船目标有效转速之间的关系,得出目标有效转速最大时成像平面最稳定、分辨率最高的结论,进而确定以转速最大的时段作为成像时间段的选择准则.相比已有的选择方法,文中所提方法的成像质量更好.仿真和实测数据的处理结果,验证了该方法的有效性.

Ship targets on the sea swing because of the sea wave, which leads to instability of the rotation speed and variation of the image project plane. As a result, imaging interval selection should be taken into consideration in order to obtain a high quality ISAR image. In this paper, firstly, the relationship between effective rotating speed and image project plane is analyzed in detail, by which the conclusion that the image project plane is stable and the resolution of the ISAR image is best when the valid speed of rotation of a ship target is highest is drawn. Then a new method to select favorable imaging interval based On the rotation speed of ship targets is proposed. In comparison with existing methods, the proposed one can select a better period for ISAR imaging, which leads to an imaging result with higher quality. The effectiveness of the proposed method is verified by simulation and real data processing result.