弹载侧视SAR成像及几何校正研究

Study of imaging processing and geometric correction of missile-borne side-looking SAR

针对装载在导弹上的侧视合成孔径雷达(SAR)在导弹下降飞行过程中成像处理及图像的几何校正问题,根据导弹所要求的合成孔径雷达成像期间内的飞行特点,建立了SAR工作的空间几何模型。由于要求成像的过程中,弹体的高度在不断减小,SAR图像存在严重的几何失真。根据成像过程中的几何关系,提出了校正SAR图像几何失真的方法,通过成像处理仿真试验验证了所提出的几何失真校正方法的有效性。

The issue of imaging processing and image geometric correction ot missile-borne sine-looKing SAR during its descending flight is presented. According to the flight speciality of missile, the SAR operation geometric model is presented. Because of the decrease of altitude during SAR operation, the SAR image obtained by imaging processing is seriously distorted. The geometric distortion correction method of the SAR image is proposed. The effectiveness of the method is demonstrated by simulation.