| 一种同轨双基SAR的非线性CS成像算法 |
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| 引用本文： | 陈士超,邢孟道,保铮.一种同轨双基SAR的非线性CS成像算法[J].西安电子科技大学学报,2014,41(3):1-7. |
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| 作者姓名： | 陈士超 邢孟道 保铮 |
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| 作者单位： | (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) |
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| 基金项目： | 国家自然科学基金优秀青年基金资助项目(61222108)；稀疏微波成像信号处理方法研究资助项目(2010CB731903)；“十二五”预研项目(51307030102) |
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| 摘 要： | 针对大斜视情形下同轨双基合成孔径雷达(SAR)中目标的距离徙动和二次距离压缩(SRC)的空变性问题，基于严格解析的双基频谱，提出了一种适用于同轨双基SAR的非线性线频调变标成像算法．与适用于小斜视角条件的线频调变标成像算法不同，该算法不仅考虑了调频率随多普勒频率的变化，而且也考虑了其随距离的线性变化，更好地实现了同轨双基SAR中SRC的精确补偿，取得了满意的聚焦效果．仿真实验验证了所提算法的有效性．
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| 关 键 词： | 双基地合成孔径雷达 非线性线频调变标成像算法 雷达成像 |
| 收稿时间： | 2013-02-03 |
Focusing of highly-squinted bistatic SAR using the nonlinear CS algorithm for constant-offset configuration |
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| CHEN Shichao,XING Mengdao,BAO Zheng.Focusing of highly-squinted bistatic SAR using the nonlinear CS algorithm for constant-offset configuration[J].Journal of Xidian University,2014,41(3):1-7. |
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| Authors: | CHEN Shichao XING Mengdao BAO Zheng |
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| Affiliation: | (National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an 710071， China) |
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| Abstract: | Focusing on the range variance of the range cell migration (RCM) and the second range compression (SRC) for tandem bistatic SAR with high squinted angles, a nonlinear chirp scaling algorithm (NCSA) is proposed to handle the problems based on an exact analytical bistatic spectrum. Unlike the chirp scaling (CS) imaging algorithm which is suitable for the case with small squint angles, not only is the variation with the Doppler frequency considered for the Doppler chirp rate, but also its variation with range is taken into account. The proposed algorithm can compensate the SRC for tandem bistatic SAR well. Satisfactory results are obtained with simulated experiments. |
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| Keywords: | bistatic synthetic aperture radar nonlinear chirp-scaling algorithm radar imaging |
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