基于分块技术的相位展开算法(英文)

Phase Unwrapping Based on Region Block

对干涉相位图的相位展开是干涉合成孔径雷达处理过程中的重要步骤,也是干涉合成孔径雷达理论与应用研究的难点所在.在充分利用干涉相位图中的干涉条纹信息的基础上,提出了一种基于分块技术的相位展开算法.首先对干涉相位图做了分块处理,块是由干涉条纹线和图像边界线组成的一个封闭的区域,在一个块内不存在相位跳跃,即在块内的相位展开已经完成.在下一步对全图做相位展开时,再逐块进行.最后通过后处理技术进行错误校正.通过对真实数据的实验和与传统方法的比较,证实了算法的有效性和稳定性.

Phase unwrapping for interferogram is the key and the most difficult step in the processing of Interferometric Synthetic Aperture Radar. By using the fringe lines of the interferometric phase image, we present one phase unwrapping algorithm based on region block. The image is first divided into distinct blocks. Blocks are delimitated by fringe lines and the border of the image such that there is no phase jump inside each of the blocks. Then phase unwrapping is performed block by block over the whole image. Finally, post-processing is applied to remove local error due to incorrect unwrapping. Results are shown on the real and simulated data. Comparison with one of the traditional methods demonstrates the efficiency and robustness of the approach.