基于三幅子图的干涉合成孔径雷达数据处理方法研究

现有干涉合成孔径雷达(InSAR)数据处理方法需要单视复图像对包含的所有四幅子图信息, 且生成的干涉相位图去相关噪声非常严重。提出了基于三幅子图的InSAR数据处理方法：等值线相关干涉法, 包括图像对配准和干涉相位图生成。首先介绍了条纹方向图和条纹等值线窗口求取的方法, 并对算法进行了改进, 然后采用相关的方法详细推导了在等值线窗口内InSAR图像的配准和干涉相位图生成的公式。模拟和实测数据表明, 等值线相关干涉法(CCI方法)仅需用InSAR复数图像对的4个实虚部子图中任意3个能得到基本无斑点噪声、无模糊效应的干涉相位图, 并且减少了数据的传输和处理量, 是一种InSAR数据处理的全新方法。

Study of Interferometric Synthetic Aperture Radar Data Processing Method Based on Three Part Images

The single look complex image of synthetic aperture radar interferometry (InSAR) data includes four parts, all the parts of which will be used with the current InSAR data processing methods, which, however, is loaded with high-level decorrelation noise. In this paper, the InSAR data processing method proposed by the authors based on three part images are introduced comprehensively. The new technology includes image pair registration and the creation of interferograms. which is named contoured correlation interferometry (CCI). Firstly, the algorithm for the calculating of fringe orientations is introduced and improved. Secondly, the formulations of the image pair registration and the creation of interferograms are deduced with the correlation method in this paper, Simulative and practical experiments indicate that CCI method which needs only arbitrary three image parts from the four image parts of InSAR complex image pair to get interferogram without noise and blurring effect is a totally novel method to InSAR data processing, which also can save the time to data transferring and processing.