一种空间域支撑区融合的改进Omega-K算法

摘要

It is hard for the conventional Omega-K algorithm to implement the coherent addition of the sub-aperture image to realize the full-aperture resolution.A distance domain data support region (DSR) fusion approach based on the modified Omega-K algorithm is proposed in this paper.By the implementation of the modified sub-aperture wavenumber domain algorithm,the range-azimuth coupling is solved.At the same time, the burden of the zeros padding processing introduced by the short distance DSR of the sub-aperture data is greatly mitigated.Then the coherence processing and distance domain data support region fusion are performed.By adding the sub-aperture data coherently,the full-aperture resolution in azimuth is realized.%针对传统Omega-K算法难以通过子孔径图像的相干叠加实现高分辨成像,提出一种基于改进Omega-K子孔径成像算法的空间域融合方法.利用改进的子孔径数据方位波数域聚焦方法,实现方位向处理独立于解耦合操作,同时避免了子孔径成像在较短空间域支撑区所引起的大量补零操作.再对各子孔径数据进行相干性处理及方位向空间域支撑区融合,通过各子孔径数据相干叠加实现全孔径数据的高分辨成像.