基于多普勒谱估计的多通道SAR盲重构方法
发布时间：2018-11-03 12:45
【摘要】：方位信号重构是多通道合成孔径雷达(sythetic aperture radar,SAR)成像过程中关键的一个步骤。文中在现有算法的基础上进行改进和扩展,提出了一种基于多普勒谱结构估计的多通道SAR盲重构方法,能够有效解决模糊分量个数和位置变化,导向矢量未知时信号重构的问题。该方法借助Capon谱估计的思想获得混叠多普勒谱的结构图,然后根据结构图构造导向矢量,实现方位信号无模糊重构。所提出的算法能够尽可能保持多普勒谱的完整性,并抑制多普勒谱边缘的噪声。仿真实验验证了所提算法的有效性。
[Abstract]:Azimuth signal reconstruction is a key step in multi-channel synthetic aperture radar (sythetic aperture radar,SAR) imaging. In this paper, we improve and extend the existing algorithms, and propose a multi-channel SAR blind reconstruction method based on Doppler spectral structure estimation, which can effectively solve the number and position changes of fuzzy components. The problem of signal reconstruction when the steering vector is unknown. Based on the idea of Capon spectrum estimation, the structure diagram of aliasing Doppler spectrum is obtained, and then the orientation vector is constructed according to the structure diagram to realize the azimuth signal without fuzzy reconstruction. The proposed algorithm can maintain the integrity of the Doppler spectrum as much as possible and suppress the noise in the edge of the Doppler spectrum. Simulation results show that the proposed algorithm is effective.
【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;西安电子科技大学信息感知技术协同创新中心;
【基金】：国家自然科学基金(61301292) 空间测控通信创新探索基金(201509A)资助课题
【分类号】：TN957.52
本文编号：2307832
[Abstract]:Azimuth signal reconstruction is a key step in multi-channel synthetic aperture radar (sythetic aperture radar,SAR) imaging. In this paper, we improve and extend the existing algorithms, and propose a multi-channel SAR blind reconstruction method based on Doppler spectral structure estimation, which can effectively solve the number and position changes of fuzzy components. The problem of signal reconstruction when the steering vector is unknown. Based on the idea of Capon spectrum estimation, the structure diagram of aliasing Doppler spectrum is obtained, and then the orientation vector is constructed according to the structure diagram to realize the azimuth signal without fuzzy reconstruction. The proposed algorithm can maintain the integrity of the Doppler spectrum as much as possible and suppress the noise in the edge of the Doppler spectrum. Simulation results show that the proposed algorithm is effective.
【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;西安电子科技大学信息感知技术协同创新中心;
【基金】：国家自然科学基金(61301292) 空间测控通信创新探索基金(201509A)资助课题
【分类号】：TN957.52
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