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针对宽观测带SAR图像,在对入射角效应量化研究的基础上,提出了一种入射角效应按类校正方法。利用分水岭分割和区域标记技术实现地物取样,基于结合线性回归估计的余弦朗伯定律,实现对地物后向散射值的按类辐射校正。针对Envisat ASAR C波段HH极化数据的实验结果表明,入射角效应对雷达后向散射有明显的影响,含水量越高的地物类型,入射角效应越明显。利用本文方法进行入射角效应校正的效果优于绝对定标和一阶余弦校正的效果。
Aiming at the wide observation SAR image, based on the quantitative analysis of the incident angle effect, a correction method based on the class of incident angle is proposed. By using watershed segmentation and regional labeling technology, the ground object sampling is realized. Based on the cosine Lambert law combined with the linear regression estimation, the class-based radiation correction of the backscattering data is achieved. Experimental results on HH polarization data of the Envisat ASAR C band show that the incident angle effect has a significant effect on the radar backscattering. The higher the water content is, the more obvious the incident angle effect is. The effect of incident angle correction using this method is better than that of absolute calibration and first-order cosine correction.