干涉合成孔径雷达的垂直基线对图像相干性的影响

The Effect of the Perpendicular Baseline on Coherence for SAR Images in InSAR

本文指出了InSAR中垂直基线是影响图像相干性的重要因素,论证了现有的直接计算相关系数的公式是基于理想信号得出的,然后结合实际雷达信号的频率特性推导出了一个直接计算相关系数的公式,并给出了在各种斜坡地形情况下相关系数与垂直基线的变化关系.这种计算方法及其数值结果可用于对干涉合成孔径雷达的基线设计和性能评估.

We propose that perpendicular baseline in InS AR is an important factor affecting the coherence of image pairs, and demonstrate that the existing formula for coherence calculation is based on ideal signal. Then a formula for calculating the correlation coefficient is deduced in combination with the frequency characteristics of radar signals. Furthermore, the changing relationship between correlation coefficient and perpendicular baseline in case of any slope terrain is illustrated. This approach and its numerical results can be referenced in InSAR baseline designing and performance evaluation.