HY-1C卫星影像中太阳耀斑区域的预测技术研究

Research on Prediction Technology of Sun Glint Region in HY-1C Satellite Image

对卫星影像太阳耀斑区域的预测是保障基于船舶的现场同步观测(以下简称船-星同步观测)有效实施的基础性工作。本文在对海洋一号C卫星(HY-1C)卫星影像各像元观测几何分析的基础上,简化构建卫星影像各像元的网格化模型,介绍了利用卫星轨道报估算的卫星-太阳-像元位置的观测几何,进而估算卫星影像中太阳耀斑区域的技术方法。经与HY-1C实际卫星影像的应用比对,表明本文预测的像元位置、太阳位置,以及卫星观测天底角/方位角均与实际影像数据有很好的重合度,预测的太阳耀斑区域与实际影像耀斑掩码区重合度良好,验证了该方法能够预测影像中太阳耀斑区域,保障船-星同步观测的能力。

The prediction of sun glint area in satellite image is foundational work to ensure the effective implementation of ship-satellite synchronous observation.In this paper,based on the geometric analysis of each pixel in the HY-1C image,we simplify the grid model of each pixel,and introduce the technical method to estimate the sun glint area in the satellite image.This method is based on the observation geometry of the satellite-sun-pixel position estimated by the satellite orbit report.Comparing the practical applications of satellite images with HY-1C,we find that the position of the pixel,the position of the sun and the nadir angle/azimuth angle of the satellite observation in this paper have a good coincidence with the actual image data,and the predicted sun glint area coincides well with the actual image glint mask area.This method is validated in the prediction of solar sun glint area,guarantee ship-star synchronous observation ability.