距离-多普勒(R-D)算法是SAR成像中较为普遍的一种成像方法,被广泛应用在各个方面的SAR成像工作中。由于成像处理中常采用分段处理、分段校正的方法,雷达斜视时会在距离徙动的校正中造成各段交界处的跳跃现象,对成像带来不便。文中结合机载SAR斜视的实测数据,讨论了在原有的R-D算法基础上的一种改进方案,即在时域校正线性距离走动并频域校正距离弯曲,有效地避免了这种跳跃现象,使成像效果得到明显改善。

The Range-doppler(R-D) algorithm,used extensively in SAR imaging processing in many situations,is a conventional one for SAR imaging.Due to employing the sub-aperture method for processing and correcting,there is a jumping phenomenon on the borders of the segments while compensating the range migration when the radar is squinting,which is a trouble for imaging.By combining with the measured data of the airborne squinted SAR,an improved algorithm based on the original R-D algorithm is proposed in this paper,which corrects the linear range walk in time domain and the range curvature in frequency domain.It avoids the jumping phenomenon and improves the imaging result significantly.

TN957.52 TN958

国家“十五”预研基金资助项目