| 弹载SAR下降段成像算法研究 |
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| 引用本文： | 周松,周鹏,李亚超,邢孟道,保铮. 弹载SAR下降段成像算法研究[J]. 西安电子科技大学学报(自然科学版), 2011, 38(3): 90-98. DOI: 10.3969/j.issn.1001-2400.2011.03.015 |
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| 作者姓名： | 周松 周鹏 李亚超 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; |
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| 基金项目： | 国家自然科学基金重大项目资助项目(60890072); 博士学科点专项科研基金资助项目(200807010002) |
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| 摘 要： | 弹载SAR下降段成像中,弹体较大的下降速度和加速度将导致SAR回波信号的多普勒调频率沿方位向变化,影响方位聚焦.针对该问题,提出了一种利用方位非线性变标(NLCS)的弹载SAR下降段成像算法.该算法在距离徙动校正和距离压缩处理之后,通过引入方位非线性变标操作,补偿变化的多普勒调频率,并校正图像方位畸变,从而改善了方位聚焦深度和聚焦质量.数据仿真结果验证了算法的有效性.
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| 关 键 词： | 弹载SAR 非线性变标 聚焦深度 |
| 收稿时间： | 2010-05-18 |
Research on the imaging algorithm for missile-borne SAR with downward movement |
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| ZHOU Song,ZHOU Peng,LI Yachao,XING Mengdao,BAO Zheng. Research on the imaging algorithm for missile-borne SAR with downward movement[J]. Journal of Xidian University, 2011, 38(3): 90-98. DOI: 10.3969/j.issn.1001-2400.2011.03.015 |
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| Authors: | ZHOU Song ZHOU Peng LI Yachao 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: | During the downward movement for Missile-Borne SAR imaging,variation of Doppler FM rates for echo signal severely affects the focusing effect,which is introduced by high vertical velocity and acceleration.For this reason,by using azimuth nonlinear chirp scaling(NLCS),an imaging algorithm for Missile-Borne SAR is proposed in this paper.After range cell migration correction and range compression,variation of Doppler FM rates for the echo signal can be compensated and image distortion can be corrected by the o... |
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| Keywords: | missile-borne SAR nonlinear chirp scaling(NLCS) focus depth |
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