空间调制干涉成像光谱仪在轨相对定标新方法
发布时间：2018-08-31 10:00
【摘要】：干涉型成像光谱仪干涉数据会因探测器探元响应不一致产生畸变,而干涉图的极小偏差会导致复原光谱图有明显变化,所以对干涉图进行相对定标,消除探元响应不一致显得尤为重要。提出了一种基于辐射定标场的干涉型成像光谱仪在轨相对定标新方法,在没有实验室相对定标系数的前提下,只需要获取地面上垂轨方向覆盖数行CCD探元的均匀地物光谱,每一行地物光谱对应一帧干涉图,就可以通过这一均匀地物的光谱仿真出干涉图,与实际所测干涉图进行相位匹配后计算出相对定标系数。验证结果表明使用该方法对干涉图进行相对校正可以取得良好的效果,校正后的干涉图走势平稳,在远离零光程差处沿干涉方向呈现明显的干涉条纹,消除了复原光谱图中的条带。
[Abstract]:The interference data of the interferometric imaging spectrometer will be distorted because the detector response is inconsistent, and the minimum deviation of the interferogram will lead to the obvious change of the recovered spectrogram, so the interferogram is relatively calibrated. It is very important to eliminate the inconsistency of probe response. A new method of in-orbit relative calibration of interferometric imaging spectrometer based on radiometric calibration field is proposed. Without the relative calibration coefficient in the laboratory, it is only necessary to obtain the uniform surface spectrum of the vertical orbit covering several rows of CCD elements on the ground. Each line of ground object spectrum corresponds to a frame of interferogram, and the interferogram can be simulated by the spectrum of this uniform ground object, and the relative calibration coefficient can be calculated by matching the phase with the actual interferogram. The results show that the method can achieve good results in the relative correction of interferogram. The corrected interferogram has a smooth trend and presents obvious interference fringes along the interference direction far from zero optical path difference. The band in the restored spectral map is eliminated.
【作者单位】： 中国科学院安徽光学精密机械研究所;中国科学院大学;
【分类号】：TH744.1;O433
[Abstract]:The interference data of the interferometric imaging spectrometer will be distorted because the detector response is inconsistent, and the minimum deviation of the interferogram will lead to the obvious change of the recovered spectrogram, so the interferogram is relatively calibrated. It is very important to eliminate the inconsistency of probe response. A new method of in-orbit relative calibration of interferometric imaging spectrometer based on radiometric calibration field is proposed. Without the relative calibration coefficient in the laboratory, it is only necessary to obtain the uniform surface spectrum of the vertical orbit covering several rows of CCD elements on the ground. Each line of ground object spectrum corresponds to a frame of interferogram, and the interferogram can be simulated by the spectrum of this uniform ground object, and the relative calibration coefficient can be calculated by matching the phase with the actual interferogram. The results show that the method can achieve good results in the relative correction of interferogram. The corrected interferogram has a smooth trend and presents obvious interference fringes along the interference direction far from zero optical path difference. The band in the restored spectral map is eliminated.
【作者单位】： 中国科学院安徽光学精密机械研究所;中国科学院大学;
【分类号】：TH744.1;O433
【参考文献】
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