复杂场景机械交错拼接遥感相机在轨相对定标

为了实现机械交错拼接型(TDICCD)遥感相机高频次、高精度相对辐射定标,本文提出一种面向复杂场景的在轨非均匀性校正方法。该方法在相机绕偏航轴旋转前后进行正交二次成像,利用所获取的偏航成像数据、常规成像数据分别对阵列内、阵列间探元进行相对定标;结合复杂场景宽辐射动态范围的特点,利用多点曲线拟合的方法实现相对定标参数解算,最终达到非均匀性校正的目的。利用仿真成像数据对均匀场景以及复杂场景进行相对辐射定标试验,结果表明,在非均匀场景中经复杂场景正交二次成像定标(OSICCS)后图像非均匀性NU系数相较于常用方法定标后图像非均匀性NU系数降低了0.499 1%以上,条纹条带噪声以及残余条带噪声得到有效去除。

On-orbit relative calibration of mechanical interlaced stitching cameras in complex scenes

Proposes an on-orbit non-uniformity correction method for complex scenes, in order to achieve high-frequency and highprecision relative radiation calibration for mechanically interleaved stitching time delay integration charge coupled device ( TDICCD) cameras on orbit. This method performs orthogonal secondary imaging before and after the camera rotates around the yaw axis, and uses the side slither imaging data and conventional imaging data to respectively calibrate the probe elements within and between arrays. Combining the characteristics of the wide radiation dynamic range of complex scenes, the method of multi-point curve fitting is used to calculate relative calibration parameters and finally achieve the purpose of non-uniformity correction. By using simulation imaging data to perform relative radiometric calibration experiments on uniform scenes and complex scenes, these results show that the image non-uniformity NU coefficient which is processed by the orthogonal secondary imaging calibration of the complex scene(OSICCS) in the non-uniform scene is 0. 499 1% lower than that after the common calibration method, meanwhile, the noticeable striping artifact and residual noise are removed effectively.