基于条带模式和聚束模式合成孔径雷达的内在联系,提出一种将条带回波信号划分成等效聚束子孔径数据,并利用波数域算法进行聚束成像的方法。该算法首先对回波数据进行两维的频域匹配滤波,然后在距离波数域中利用Stolt插值变换获得两维均匀分布的地物反射率函数的重建频谱,最终通过IFFT成像。在实现场景地物成像处理的基础上,进而利用改进的秩一自聚焦算法实现剩余相位误差的估计及补偿,从而获得目标的高分辨图像。仿真及实测数据的成像效果验证了文中提出方法的可行性及有效性。

Based on the inherent relationship between stripmap SAR and spotlight SAR,a method is proposed in this paper,which divides the squinted stripmap synthetic aperture into a set of subapertures and converts measured SAR signal in the subapertures into equivalent spotlight data,and then utilizes the wavenumber domain focusing algorithm to accomplish spotlight mode imaging.The algorithm firstly performs the two-dimensional frequency domain matched filtering of the SAR data,then takes advantage of the stolt inter...