电讯技术2016，Vol.56Issue(8)：879-886,8.DOI:10.3969/j.issn.1001-893x.2016.08.009
复杂轨迹合成孔径雷达后向投影算法图像流GPU成像
Image Streams GPU-based Back Projection for Complex Trajectory Synthetic Aperture Radar Imaging
摘要
Abstract
Compared with the frequency domain algorithms based on Fourier transform, back projection (BP) algorithm is more applicable for high-precision synthetic aperture radar(SAR) imaging with com-plex trajectory because of its time-domain coherent integration point by point. However,BP algorithm has a problem of huge calculation quantity,which restricts its application to fast SAR imaging with large scene and big data. Graphics processing unit( GPU) has a strong ability in floating-point calculation and parallel processing,and provides an effective approach for large-scene fast imaging with BP algorithm. According to GPU parallel processing, this paper proposes a new processing method of large-scene SAR fast imaging with BP algorithm,based on complex motion of image flow. Depending on the character that the image pix-els in BP algorithm are processed independently,this method uses the parallelization of image pixels and image-flow processing to design a scheduling scheme between apertures and image caches to improve the imaging efficiency of SAR with large scene and big data. Simulation and airborne experimental results dem-onstrate the effectiveness of the method,and fast imaging with the large scene of 8 192 ×8 192 has been re-alized in the condition of limited GPU memory,and the speed-up ratio can be improved 300 times com-pared with the traditional CPU single-thread processing.关键词
SAR/复杂轨迹/后向投影算法/GPU加速/大场景成像Key words
SAR/complex trajectory/BP algorithm/GPU acceleration/large scene imaging分类
信息技术与安全科学引用本文复制引用
韦顺军,蒲羚,张晓玲,师君..复杂轨迹合成孔径雷达后向投影算法图像流GPU成像[J].电讯技术,2016,56(8):879-886,8.基金项目
国家自然科学基金资助项目(61501098) （61501098）
中国博士后科学基金项目(2015M570778) （2015M570778）
航空科学基金与航空电子系统射频综合仿真航空科技重点实验室联合资助项目(20142080007) Foundation Item:The National Natural Science Foundation of China ( No.61501098) （20142080007）
The China Postdoctoral Science Foundation (2015M570778) （2015M570778）
The Aeronautical Science Foundation of China(No.20142080007) （No.20142080007）
