GPU加速下的三维快速分解后向投影SAS成像算法  

Three-dimensional fast factorized back projection SAS imaging algorithm accelerated by GPU

作　　者：陶鸿博 张东升[1] 黄勇[3] TAO Hongbo;ZHANG Dongsheng;HUANG Yong(Laboratory of Ocean Acoustic Technology,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Ningbo“Five in One”Campus Education Develo pment Center,Zhejiang University,Ningbo 315100,China)

机构地区：[1]中国科学院声学研究所海洋声学技术实验室,北京100190 [2]中国科学院大学电子电气与通信工程学院,北京100049 [3]浙江大学宁波“五位一体”校区教育发展中心,浙江宁波315100

出　　处：《系统工程与电子技术》2024年第10期3247-3256,共10页Systems Engineering and Electronics

基　　金：中国科学院重点部署项目(KGFZD-145-22-06-02)资助课题。

摘　　要：后向投影(back projection,BP)算法是一种精确的时域成像算法,但BP算法的计算复杂度高,难以实现实时性成像,特别是在考虑三维成像时,BP算法的计算复杂度会进一步增加。提出一种应用在合成孔径声纳(synthetic aperture sonar,SAS)上的三维快速分解BP(fast factorized BP,FFBP)成像算法,并利用图形处理器(graphics processing unit,GPU)加速三维FFBP算法。经过对点目标的测试,计算时间从原本的263 s降低到了2.3 s,解决了SAS中的三维成像实时性问题。同时,验证了所提算法在非理想航迹下的成像效果。结果表明,在添加幅度不超过0.1 m(一个波长以内)的正弦扰动时,所提算法对点目标仍有良好的聚焦效果。The back projection(BP)algorithm is an accurate time-domain imaging algorithm,but the high computational complexity of the BP algorithm makes it difficult to achieve real-time imaging.Especially when three-dimensional imaging is considered,the computational complexity of the BP algorithm will further increase.The paper proposes a three-dimensional fast factorized BP(FFBP)imaging algorithm applied to synthetic aperture sonar(SAS),and accelerates the three-dimensional FFBP algorithm using a graphics processing unit(GPU).After testing on point targets,the calculation time is reduced from the original 263 s to 2.3 s,solving the real-time imaging problem in SAS.At the same time,the imaging effect of the proposed algorithm under non-ideal trajectories is verified.The results show that when a sinusoidal disturbance with an amplitude not exceeding 0.1 m(within one wavelength)is added,there is still a good focusing effect on the point target.

关 键 词：快速分解后向投影 并行计算 图形处理器 合成孔径声纳 三维成像 

分 类 号：TN911.7[电子电信—通信与信息系统]