| 低重频采样SAR系统中地面运动目标参数估计 |
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| 引用本文： | 刘燕,武其松,孙光才,邢孟道,刘保昌,保铮. 低重频采样SAR系统中地面运动目标参数估计[J]. 中国科学:信息科学, 2011, 0(12) |
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| 作者姓名： | 刘燕 武其松 孙光才 邢孟道 刘保昌 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(批准号:60890072)资助项目 |
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| 摘 要： | 低脉冲重复频率(pulse repetition frequency,PRF)采样合成孔径雷达(synthetic aperture radar,SAR)系统中运动目标回波信号存在Doppler谱模糊和Doppler中心频率模糊,这给运动目标参数估计带来了很大困难.由于杂波相消后的运动目标可以看作空间稀疏信号,基于压缩感知理论,本文提出一种低PRF采样SAR系统中的运动目标参数估计的新方法.首先采用基于Keystone变换的稀疏走动校正方法来实现包络走动校正和估计出引起整数倍PRF Doppler频率偏移的垂直航向速度分量,利用压缩感知(compressed sensing,CS)理论进行稀疏信号重建,将Doppler谱模糊的运动目标参数估计问题转化为求解优化方程稀疏解,最后利用优化方法获得运动目标的速度以及方位位置.仿真实验和实测数据都验证了本文方法的有效性.
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| 关 键 词： | 合成孔径雷达 运动目标 运动参数估计 Keystone变换 走动校正 压缩感知 |
Parameter estimation of moving targets in the SAR system with a low PRF sampling rate |
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| LIU Yan,WU QiSong,SUN GuangCai,XING MengDao,LIU BaoChang , BAO Zheng Key Laboratory for Radar Signal Processing,Xidian University,Xi'an ,China. Parameter estimation of moving targets in the SAR system with a low PRF sampling rate[J]. Scientia Sinica Informationis, 2011, 0(12) |
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| Authors: | LIU Yan WU QiSong SUN GuangCai XING MengDao LIU BaoChang & BAO Zheng Key Laboratory for Radar Signal Processing Xidian University Xi'an China |
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| Affiliation: | LIU Yan,WU QiSong,SUN GuangCai,XING MengDao,LIU BaoChang & BAO Zheng Key Laboratory for Radar Signal Processing,Xidian University,Xi'an 710071,China |
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| Abstract: | In the synthetic aperture radar(SAR) system with low pulse repetition frequency(PRF) sampling,it is difficult for the motion parameters estimation of the moving targets,because of the Doppler spectrum ambiguity and Doppler centroid frequency ambiguity of the echo signals.Considering that moving targets are sparsely distributed in the observed scene,their positions and velocities can be reconstructed by using the compressed sensing(CS) technique.In this paper,the range-walk correction are implemented by the ... |
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| Keywords: | synthetic aperture radar(SAR) moving target motion parameter estimation Keystone transform range-walk correction compressed sensing(CS) |
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