一种利用沿航迹干涉合成孔径雷达复图像域数据的双边滤波算法  

An Interferometric Bilateral Filter Based on Complex Along-track Interferometric Synthetic Aperture Images

作　　者：田敏 段崇棣[1] 李财品[1] 王伟伟[1] 李渝[1] TIAN Min;DUAN Chongdi;LI Caipin;WANG Weiwie;LI Yu(China Academy of Space Technology(Xi’an),Xi’an 710000,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000

出　　处：《空间电子技术》2020年第5期45-51,共7页Space Electronic Technology

基　　金：国家自然科学基金(编号:61701395)。

摘　　要：沿航迹干涉合成孔径雷达能够提供成像物体的雷达后向散射信息与运动信息,被应用于海面洋流流速测量与地海运动目标识别。在实际雷达系统中,由于系统误差、噪声以及回波信号的去相关导致干涉信息测量精度下降。针对上述问题,从信号处理角度提出一种利用沿航迹干涉合成孔径雷达复图像域数据的双边滤波处理算法。该方法利用像素点的干涉幅度、干涉相位以及空间物理分布信息的相似程度自适应地调整滤波器权系数,以平滑复图像域噪声和缓解传统多视滤波处理算法对图像分辨率的损失问题,从而提升干涉信息测量精度。根据沿航迹干涉合成孔径雷达海面舰船目标实测数据实验结果可得:相比于现有典型的滤波方法,所提算法能够提升干涉测量的精度,进而提升舰船目标与海杂波背景的干涉信息分布差异,为后续运动舰船目标的检测提供准确的干涉域特征。Along-track interferometric synthetic aperture radar(ATI SAR)provides the radar cross section and the motion information of the imaged objects,which has been widely used in sea current measurements,and ground and ocean moving target identification.There is a poor measurement of interferometric information due to system errors,noise and de-correlated radar echoes in real systems.To address the problem,an interferometric bilateral filter based on the complex ATI-SAR image information is proposed in the perspective of signal processing.The filter utilizes the interferometric magnitude,interferometric phase and physical spatial distance similarities of pixels in the image to adjust the filter coefficients adaptively to smooth the random noise and maintain the objects'spatial structure,which facilitates the accurate measurement of the interferometric information.The experimental results on AIR-SAR airborne real dataset of sea-clutter background with a moving ship indicate that the proposed method can improve the measurements accuracy of interferometric information,and thus to increase the differences between the ship and the background based on the complex interferogram,which facilitates the following moving ship detection by using the interferometric features.

关 键 词：合成孔径雷达 沿航迹干涉 多视滤波处理 

分 类 号：TN958[电子电信—信号与信息处理]