CAJ | 학술논문

提出了对非均匀场景同一区域成像的卫星姿态调整及基于直方图匹配的线阵CCD非线性相对辐射定标方法。当在轨卫星需要执行相对辐射定标任务时，首先计算初始偏流角并调整卫星偏航角进入在轨定标成像模式；然后在定标成像过程中控制卫星偏航角，使得线阵CCD阵列的所有像元能够依次对同一区域成像；最后基于直方图匹配方法建立高精度非线性相对辐射定标模型。仿真实验给出了不同姿态对应的定标成像情况下的偏航角调整大小与调整周期，并分析了引起偏流角误差的因素及其对偏流角的不确定性。该方法既不需要地面均匀定标场等，也不需要统计分析大量在轨图像数据；且每一轨都可以执行定标任务，避免了卫星不同轨数据之间的不稳定性所带来的定标源自身不可靠问题。
제출료대비균균장경동일구역성상적위성자태조정급기우직방도필배적선진CCD비선성상대복사정표방법。당재궤위성수요집행상대복사정표임무시，수선계산초시편류각병조정위성편항각진입재궤정표성상모식；연후재정표성상과정중공제위성편항각，사득선진CCD진렬적소유상원능구의차대동일구역성상；최후기우직방도필배방법건립고정도비선성상대복사정표모형。방진실험급출료불동자태대응적정표성상정황하적편항각조정대소여조정주기，병분석료인기편류각오차적인소급기대편류각적불학정성。해방법기불수요지면균균정표장등，야불수요통계분석대량재궤도상수거；차매일궤도가이집행정표임무，피면료위성불동궤수거지간적불은정성소대래적정표원자신불가고문제。
The satellite attitude calculation method for linear CCD imaging the same region of non-uniform scene was presented, and a nonlinear relative radiometric calibration method based on histogram matching was put forward. Firstly, when it was needed to perform relative radiometric calibration task, the initial drift angle was calculated, according to which the yaw angle could be adjusted to ensure on-orbit satellite performing the calibration imaging mode. Secondly, in calibration imaging process the yaw angle was controlled to ensure all CCD detectors imaging the same region. Finally, after obtaining the same region image with CCD camera, histogram matching method was used to establish high-precision nonlinear relative radiometric calibration model. The simulation results show the magnitude and time interval of yaw angle adjustment with various attitudes, such as nadir imaging, roll attitude, pitch attitude, roll and pitch attitude, etc, and also analyze the error factors and the uncertainty of drift angle. This method needs neither the ground uniform scaling field, nor lots of on-orbit images for statistical analysis. More importantly, each track satellite images can meet the calibration condition, which avoids the unreliable problem of calibration source itself caused by the unstable of images between different tracks.