分析Burst工作模式星载SAR 系统中, 采用全孔径成像算法会产生周期性明暗条纹噪声的原因, 提出一种简单高效的一维频域滤除算法, 并给出包含该操作的改进距离多普勒成像算法流程。对于因雷达系统本身原因而产生的一些非周期不规则条纹噪声进行讨论, 针对此类噪声提出一种二维频域区域滤波的算法。通过对实际星载SAR 数据的处理, 验证算法的有效性。

We analize the reason of periodic bright and shadow stripe noise generated in burst mode SAR, when the full aperture imaging algorithm is used. A simple but efficient one-dimensional frequency domain filtering method is proposed along with the flow chart of improved Range Doppler imaging algorithm including this operation. We discuss the nonperiodic abnormal stripe noise due to the spaceborne SAR system itself, and present an area filtering method in two-dimensional frequency domain. The validities of the algorithms in the paper are proved by processing actual spaceborne SAR data.