一种顾及相干性的星载干涉SAR成像算法

An Algorithm for Spaceborne Interferometric SAR Signal Processing with Coherence Optimization

在分析相干性与多普勒中心频率差之间关系的基础上,提出了一种顾及相干性的星载干涉SAR成像算法。在成像处理中,针对待干涉成像的SAR回波信号选择一致化的成像参数,充分保证干涉SAR复数影像对之间的相干性,进而得到高质量的干涉图。实验结果表明,所提出的成像算法更适用于雷达干涉测量(InSAR)的研究及应用。

Based on intensive analysis of the relationship between interferometric coherence and Doppler frequency difference, we propose an algorithm for spaceborne interferometric SAR signal processing with coherence optimization. Different from those traditional SAR processing algorithms, the basic idea of this algorithm is the Doppler parameters in SAR signal processing should be equalized for interferometry. Although signal-noise-ratio （SNR） may be lowered, the coherence between the two SAR images can be improved. Therefore, interferograms with better quality can be acquired by employing the proposed method. The level 0 and level 1 products of ERS-1/2 Tandem datasets in Zhangbei has been tested. The results show that the quality of interferogram from level 0 data processed with the proposed method is better than that from standard level 1 data provided by ESA. The experimental results indicate the proposed method is highly desirable for research and application for InSAR technology.