【摘要】 针对方位多通道滑动聚束合成孔径雷达(SAR)系统方位波束渐进扫描的特点，结合数字波束形成(DBF)技术，提出一种基于重构多普勒谱分析的通道相位偏差估计方法。该方法在方位多通道数据重构之前，对每个通道进行一个方位“去斜”操作，解决由DBF技术和方位波束渐进扫描所造成的多普勒谱混叠。其次，针对多通道SAR系统中相位偏差造成重构多普勒谱中来自各通道的频谱分量不均匀的特性，以最小化频谱分量间的跳变值为优化准则，可以有效地估计通道间的相位偏差。仿真实验验证了该方法的有效性和稳健性，校正后的SAR图像质量得到明显提高。更多还原

【Abstract】 Based on the characteristics of azimuth beam progressive scanning of multi-channel sliding spotlight synthetic aperture radar(SAR)system and combined with digital beamforming(DBF)technology, a novel channel phase bias estimation method based on reconstructed Doppler spectrum analysis is proposed.Before the reconstruction of azimuth multi-channel data, performs an azimuth“deramp”operation for each channel to resolve Doppler spectral ambiguity problems caused by both the DBF technique and azimuth beam progressive scanning.Secondly, considering that the phase bias in multi-channel SAR system results that the non-uniform spectrum components from each channel in the reconstructed Doppler spectrum, the channel phase bias can be effectively estimated by minimizing the jump between spectrum components into an optimization criterion. Simulation experiments validated the effectiveness and robustness of proposed method, and the corrected SAR image quality is obviously improved.更多还原