基于NUFFT的FMCW CSAR圆柱面场景成像波数域算法  

NUFFT Based ω-k Algorithm of FMCW CSAR for Cylindrical Reconstruction Areas

作　　者：宋德鹏 曲毅[1] 姜頔 付凯城 SONG De-penga QU Yia JIANG Dih FU Kai-chenga(Engineering College of CAPF, a. Information Engineering Departmen b. Electronic Technology Engineering Department, Xi＇an 710086, Chin)

机构地区：[1]武警工程大学信息工程系,西安710086 [2]武警工程大学电子技术系,西安710086

出　　处：《电光与控制》2017年第1期24-26,95,共4页Electronics Optics & Control

基　　金：国家自然科学基金青年科学基金(61101238)

摘　　要：针对调频连续波圆周合成孔径雷达(FMCW CSAR)传统波数域算法对圆柱面场景成像时插值的精度直接影响成像质量且计算量较大的问题,提出了一种基于非均匀傅里叶变换的FMCW CSAR圆柱面场景成像的波数域算法,基于雷达到目标点的斜距按照四阶泰勒级数展开推导出了FMCW CSAR波数域回波信号,并在此基础上利用二维非均匀傅里叶变换代替插值功能较好地实现了聚焦成像。The accuracy of the traditional ω-k algorithm of Frequency Modulated Continuous Wave （FMCW） Circular Synthetic Aperture Radar （CSAR） for image interpolation when reconstructing the cylinder areas has direct influence on the quality of imaging, and the process needs a large amount of calculation. To solve the problem, an ω-k algorithm based on Nonuniform Fast Fourier Transfornation （NUFFT） is proposed, by which the echo signal of wave-number domain is deduced according to the fourth order Taylor expansion based on the slant range from radar to target. On the basis of which, the two-dimensional NUFFT is used instead of the interpolation function, and implements focused imaging.

关 键 词：圆周合成孔径雷达 调频连续波 圆柱面场景 非均匀傅里叶变换 波数域算法 

分 类 号：TN955[电子电信—信号与信息处理]