2种多通道SAR/GMTI相位误差估计方法

针对多通道合成孔径雷达(SAR)和地面运动目标检测(GMTI)系统,提出了2种通道相位误差估计方法:a)利用杂波的信号特征向量与其导向矢量的线性关系直接进行通道误差估计;b)通过对回波数据进行方位重采样,然后利用杂波信号特征向量张成的空间(即信号子空间)与真实导向矢量张成的空间相同的原理进行误差估计。实验证明,2种方法均能有效地进行通道相位误差估计,并且方法 b)具有更高的估计精确度。

Two phase error estimation methods for multi-channel SAR/GMTI systems

Two methods are proposed to estimate channel phase errors for multi-channel Synthetic Aperture Radar(SAR)/Ground Moving Target Indication(GMTI) systems. The first method is based on the linear relationship between the clutter eigenvectors and their steering vectors. For the second method, the received echoes are resampled in azimuth, and the channel errors are estimated based on the fact that the space spanned by the signal eigenvectors (namely the signal subspace) is the same as that spanned by the practical steering vectors. The simulated and ground-based real data demonstrate the validity of the two methods, and show that the performance of the second method is better.