摘要
针对合成孔径雷达高分辨率、大测绘带宽及远作用距离的应用需求,本文提出了一种基于LBP(局部后向投影)的高分辨率SAR(合成孔径雷达)实时成像算法。由于合成孔径时间长及平台特性,载机运动轨迹在全孔径内补偿成直线代价大,本文算法首先对子孔径数据进行运动补偿及成像处理,得到聚焦良好的子图像,然后利用BP成像原理,对大场景中的每一点,在子图像中找到对应的聚焦点目标,补偿相位后进行相干叠加,最终得到高分辨率的大场景图像。该算法不仅保证了远距离、高分辨率成像所需要的精度,同时提高了后向投影算法的运算效率,有效解决了实时成像系统处理精度、数据存储的难题。实测数据的成像结果验证了该算法的有效性。
For the application requirements of synthetic aperture radar with high-resolution, wide surveying scene and far range, the LBP based real-time imaging algorithm for high-resolution SAR is proposed. Because of long synthetic aperture time and platform features, it is hard for the platform trajectories in full aperture time correcting to straight line trajectory. The algorithm in this paper, first of all, sub-images with good focus can be obtained by motion compensation and imaging processing on the sub aperture data, then using the BP imaging principle, for each point in the big scene, finds the corresponding focal point target in the sub-image, finally we get the high-resolution images by coherent adding after phase compensation. The algorithm not only guarantees the accuracy of remote and high resolution imaging, but also improves the operational efficiency of the back projection algorithm, and effectively solves the problem of real-time imaging system processing ac- curacy and data storage. The effectiveness of the algorithm is verified through the imaging results of measured data.
作者
赵敬亮
庄龙
许道宝
郑昱
Zhao Jingliang Zhuang Long Xu DaoBao Zheng Yu(Nanjing Research Institute of Electronics Technology, Nanjing 210039, China)
出处
《信息化研究》
2017年第2期69-73,共5页
INFORMATIZATION RESEARCH
