多级多分辨快速后向投影成像算法  

Multi-Stage Multi-Resolution Fast Back-Projection Imaging Algorithm

作　　者：李杨寰[1] 宋千[1] 王鹏宇[1] 金添[1] 周智敏[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073

出　　处：《电子学报》2011年第3期518-524,共7页Acta Electronica Sinica

基　　金：国家自然科学基金项目(No.60972121);高等学校全国优秀博士学位论文作者专项资金资助项目(No.2009091)

摘　　要：子孔径划分是提高BP算法效率的基本途径,如何对其孔径进行划分以及如何确定各子图像分辨率,将直接决定算法的效率.本文从频域带宽和距离误差两方面分析图像分辨率选取的限制条件,并得到了一个统一的关于孔径长度和分辨率的条件.然后基于这一条件阐述了超宽带信号条件下如何通过选取分辨率和对子孔径进行划分以达到最高的计算效率,并依此条件提出了多级多分辨快速后向投影成像算法(MSMRBP)以适应非均匀孔径的成像条件.最后给出了外场实验结果以证明本文结论的正确性.The basic method to improve efficiency of the BP（Back-Projection） algorithm is the sub-aperture＇s way.Choosing the length of sub-apertures and the resolution of sub-images becomes the most crucial step that decides the computation efficiency.The condition that limits the image resolution is analyzed taking the bandwidth and the range error into account.Then a same result presenting the relationship between the sub-aperture length and the resolution is received.A method for dividing the sub-aperture and choosing the image resolution in UWB signal＇s circumstance is presented based on the former result.Besides the Multi-Stage Multi-Resolution Back Projection（MSMRBP） algorithm is presented to suit the nonuniform aperture condition.At last the outside experiment＇s results are presented to support the former conclusion.

关 键 词：子孔径 极坐标成像 非均匀孔径 快速后向投影算法 运动补偿 

分 类 号：TN957[电子电信—信号与信息处理]