一种面向无参考点的顺轨干涉SAR海面复图像配准方法

发布时间：2019-04-01 07:16

【摘要】：顺轨干涉SAR海面复图像通常利用静止陆地参考点进行配准,获得精确有效的海洋流场干涉相位信息。复图像中无参考点时,仅能依据海浪纹理进行配准,受海面随机运动以及低信噪比的影响,配准像素偏移往往会出现像素级误差,并导致干涉相位图质量严重下降。根据大尺度海浪变化周期较长,在干涉成像间隔内可视作静止这一特征,该文提出保留大尺度海浪对应的方位谱分量以提高数据信噪比和相关性,进而提高配准精度的方法,并选用海面实际方位分辨率作为大尺度海浪方位谱选取范围的约束条件。通过机载顺轨干涉SAR实验数据证明,所提方法可有效提高无参考点海面复图像的配准精度。
[Abstract]:In order to obtain accurate and effective interferometric phase information of ocean current field, the sea surface complex image of along orbit interference (SAR) is usually used to register the sea surface by using the stationary land reference point. When there is no reference point in the complex image, it can only be registered according to the wave texture. Under the influence of the random motion of the sea surface and the low signal-to-noise ratio, pixel-level error will often occur in the registration pixel migration, and the quality of the interferogram will be seriously degraded. According to the long period of change of large-scale waves and the fact that they can be regarded as stationary in the interval of interferometric imaging, this paper presents a method of preserving azimuth spectral components corresponding to large-scale waves to improve the signal-to-noise ratio and correlation, and then to improve the registration accuracy. The actual azimuth resolution of the sea surface is selected as the constraint condition for the selection range of azimuth spectrum of large-scale waves. The experimental data of airborne orbital interference SAR show that the proposed method can effectively improve the registration accuracy of sea surface complex images without reference points.
【作者单位】：中国科学院电子学研究所;微波成像技术国家重点实验室;中国科学院大学;
【基金】：微波成像技术国家重点实验室基金(CXJJ_15S119)~~
【分类号】：TN957.52

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