摘要: |
通过建立机载合成孔径雷达(Synthetic Aperture Radar,SAR)工作模型,介绍了SA
R成像的原理,详细分析了斜视条件下距离徙动产生的原因以及对成像的影响,针对调频变
标算
法(Chirp Scaling,CS)算法的实现过程及特点,指出其在斜视角情况下成像存在的缺陷
,提出使用改进的算法即在傅里叶变换之前进行距离徙动校正(Range Walk Correction,RW
C)的处理,重点推导了改进后的算法实现过程,并通过Matlab仿真实现了CS算法正侧视及
斜视时成像,证明改进后的算法在侧斜视情况下成像质量有较大的改善。 |
关键词: 机载合成孔径雷达 斜视角成像 调频变标算法 距离徙动校正 |
DOI: |
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基金项目: |
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Simulation of CS Algorithm for Squint Looking Airborne SAR Based on RWC |
LIU Ming-yuan,XU Song-tao,LIU Kai,HE Jian-jun |
(The Engineering Institute, Air Force Engineering University, Xi′an 710038,China;Unit 69018 of PLA, Kashi 844200, China) |
Abstract: |
Based on the squintlooking mode, the theory of airborne SAR(Synthetic
Aperture Radar) imaging is described.The reason and the effect of range migrati
on on imaging in squinted looking mode is analysed.According to the realization
process and characters of CS(Chirp Scaling) algorithm,its limitations when used
in this mode are pointed out.An improved algorithm is proposed that the range wa
lk correction(RWC) is performed before FFT(Fast Fourier Transform). The process
of the improved algorithm is emphasized. The imaging with CS algorithm in side
looking and squintlooking modes is realized through Matlab simulation.The resu
lt proves that the imaging quality is greatly improved with the algorithm in si
delooking and squintlooking modes. |
Key words: airborne SAR squint imaging chirp scaling(CS) algorithm range walk correction
(RWC) |