用于大斜视FMCW-SAR成像的频率变标算法  

Frequency scaling algorithm for high squint FMCW-SAR imaging

作　　者：李东[1] 廖桂生[1] 杨志伟[1] 徐青[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2013年第4期21-28,共8页Journal of Xidian University

基　　金：国家973计划资助项目(2011CB707001);国家自然科学基金资助项目(61101242);长江学者和创新团队发展计划资助项目(IRT0954)

摘　　要：针对现有频率变标算法在斜视角较大情况下失效的问题,提出了一种适合大斜视调频连续波合成孔径雷达成像的频率变标算法.该算法是在引入一个新的剩余视频相位项的基础上,同时考虑了变标时斜视角变化对距离向带宽的影响,有效地克服了在大斜视模式下变标时带来的距离向频谱混叠问题,从而使得频率变标算法能在大斜视模式下得到聚焦良好的成像结果.For the invalidation of the present frequency scaling algorithm in the case of the high squint angle, a modified frequency scaling algorithm for high squint Frequency Modulated Continuous Wave Synthesis Aperture Radar imaging is presented. Based on the new Residual Video Phase （RVP）, this algorithm can solve the problem of range frequency aliasing on the high squint mode effectively by considering the effect of the variation of the squint angle on the range bandwidth. Hence, high quality imaging can be obtained in the case of the high squint mode with the frequency scaling algorithm. Finally, performance analyses and simulation results demonstrate the effectiveness of the proposed algorithm.

关 键 词：合成孔径雷达 调频连续波 频率变标 大斜视成像 剩余视频相位 

分 类 号：TN957.52[电子电信—信号与信息处理]