相对辐射校正是实现多角度偏振探测仪全视场高精度辐射定标的关键技术之一。提出了一种高精度自动化的相对辐射校正方法, 采用15×15个分视场扫描测量的方式,通过高精度大型二维转台和大口径积分球参考光源实现全视场的辐射响应测量; 模拟在轨工作模式,规范了数据采集流程,编写数据采集软件实现了辐射响应图像数据获取;设计数据图像拼接算法和相关 的数据处理方法,完成了相对辐射校正的数据处理和精度分析。数据比对分析和精度分析结果表明相对辐射校正精度在0.5%～0.8%之内。

Relative radiation correction is one of the key technologies to realize high precision and full field radiometric calibration for the directional polarized camera. A high-precision and automatic method of relative radiation correction is proposed. 15×15 points vision field scanning measurements are used. The panoramic imaging measurements of radiation response are fulfilled through the integration of the high-precision and large two-dimension rotating platforms and large-diameter integrating sphere reference light source. On-orbit working mode is simulated, data collecting process is regulated, data acquisition software is written, and the acquisition of radiation response image data is fulfilled. Astitching algorithm for data image and a processing method for relative data are designed. The data processing and precision analyzing of relative radiation correction are completed. Results of data comparison analysis and accuracy analysis show that the precision of relative radiation calibration is within 0.5%～0.8%.