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A Non-linear Scaling Algorithm Based on chirp-z Transform for Squint Mode FMCW-SAR
2012
Journal of Radars
Preserved Fulltext
摘 要:该文针对调频连续波合成孔径雷达(Frequency Modulated Continuous Wave Synthetic Aperture Radar, FMCW-SAR)在斜视模式下聚焦精度降低的问题,提出一种非线性尺度变换 chirp-z 成像算法。该算法利用回波信 号在多普勒域中距离向的非线性特性,通过引入一个非线性调频信号对回波信号进行基于 chirp-z 的非线性尺度变 换,降低距离压缩和距离徙动校正的误差,提高雷达图像分辨率。采用该成像算法对点目标模拟回波的成像结果与 原始 chirp-z 算法相比,距离向分辨率和图像对比度得到提高,方位向分辨率保持不变。 关键词:调频连续波合成孔径雷达(Frequency Modulated Continuous Wave Synthetic Aperture Radar, FMCW-SAR);斜视;非线性尺度变换;chirp-z 变换 中图分类号: TN958 文献标识码: A 文章编号: 2095-283X(2012)01-0069-07
doi:10.3724/sp.j.1300.2012.20005
fatcat:scfriw62urhilgxclhecvyowni