分析了SAR成像过程中方位压缩的机理,提出了基于方位子孔径处理的机载SAR实时成像算法。该算法将方位压缩过程划分为多个方位子孔径的压缩,然后通过子孔径压缩结果的合成以完成方位压缩,整个过程基于快速傅里叶变换通过串行流水的方式实现。实录数据的成像实验表明,该算法能有效地克服实时成像中长合成孔径带来的困难,获得比较满意的成像质量。

This paper analyzes in detail the azimuth compression mechanism for airborne SAR real-time imaging,and proposes a real-time imaging algorithm based on azimuth subaperture approach for airborne SAR.Instead of full aperture compression,this algorithm first carries out azimuth subaperture compression and then completes azimuth compression by synthesizing individual results of the subaperture.The subaperture processing is implemented in series using fast fourier transform.The raw data imaging result shows that the algorithm can effectively solve the problem of the long synthesized aperture processing for real-time imaging,and improve the SAR image quality.

TN958