基于自然均匀目标的合成孔径雷达在轨快速定标方法

一种基于自然均匀目标的合成孔径雷达在轨快速定标方法，该方法包括：对需定标合成孔径雷达的未校正图像进行单元格划分；对未校正图像剔除不均匀区域单元格；之后对未校正图像的所有方位条带数据进行平均，再对距离条带拟合，求得天线增益G并对未校正图像进行相对校正得到相对校正图像；使用已校正图像作为基准图像，基于基准图像和未校正图像特征点，对两幅图像进行配准；根据处理后的基准图像和相对校正图像计算绝对定标参数解，求得绝对定标系数与偏移系数。本发明基于已定标合成孔径雷达基准图像和相对校正图像中分布式均匀目标，对在轨合成孔径雷达进行快速定标，省略了摆放人工参考设备的流程，减少了耗费的人力物力，加快定标实验进程。 The invention relates to an on-orbit rapid calibration method for a synthetic aperture radar based on a natural uniform target. The method comprises the steps of carrying out cell division on an uncorrected image of a synthetic aperture radar needing to be calibrated; removing non-uniform area cells from the uncorrected image; averaging all azimuth strip data of the uncorrected image, fitting a distance strip, solving an antenna gain G, and performing relative correction on the uncorrected image to obtain a relative corrected image; taking the corrected image as a reference image, and registering the two images based on the feature points of the reference image and the uncorrected image; and calculating an absolute