| 星载激光光斑影像激光指向变化探测法 |
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| 引用本文： | 杨雄丹,李国元,王佩贤,陈继溢,莫凡,么嘉棋,金泽林.星载激光光斑影像激光指向变化探测法[J].测绘学报,1957,49(12):1591-1599. |
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| 作者姓名： | 杨雄丹 李国元 王佩贤 陈继溢 莫凡 么嘉棋 金泽林 |
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| 作者单位： | 1. 贵州省测绘资料档案馆, 贵州 贵阳 550004;2. 自然资源部国土卫星遥感应用中心, 北京 100048;3. 辽宁工程技术大学测绘与地理科学学院, 辽宁 阜新 123000;4. 北京空间飞行器总体设计部, 北京 100094;5. 山东科技大学测绘科学与工程学院, 山东 青岛 266590 |
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| 基金项目： | 高分辨率对地观测系统重大专项应用共性关键技术项目（11-Y20A13-9001-17/18） |
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| 摘 要： | 地面光斑足印的定位精度高度依赖于激光指向角的测量精度，星载激光光斑质心提取及其变化规律对激光指向角的分析具有重要的意义。本文基于ICESat/GLAS的激光剖面阵列（laser profile array，LPA）影像数据，首先利用灰度一阶矩阵法提取LPA的质心，精度优于0.3个像素，LPA相对定位精度优于0.11个像素。其次利用傅里叶变换和傅里叶级数拟合对LPA质心坐标的变化进行周期探测和建模分析，结果表明，激光光斑影像的质心坐标存在1.83×10-4 Hz、3.36×10-4 Hz、5.19×10-4 Hz和6.71×10-4 Hz 4个明显的周期变化，拟合结果的相关性R2达到了0.86，拟合精度可达0.4″，优于0.13个像素，得到了较好的结果。可为我国的高分七号和后续的卫星激光测高数据处理提供参考。
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| 关 键 词： | 卫星激光测高 ICESat/GLAS LPA质心提取 傅里叶变换 傅里叶级数建模 |
| 收稿时间： | 2019-10-18 |
| 修稿时间： | 2020-05-04 |
Laser pointing changes detection method for space-borne laser spot image |
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| YANG Xiongdan,LI Guoyuan,WANG Peixian,CHEN Jiyi,MO Fan,ME Jiaqi,JIN Zelin.Laser pointing changes detection method for space-borne laser spot image[J].Acta Geodaetica et Cartographica Sinica,1957,49(12):1591-1599. |
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| Authors: | YANG Xiongdan LI Guoyuan WANG Peixian CHEN Jiyi MO Fan ME Jiaqi JIN Zelin |
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| Institution: | 1. Surveying and Mapping Data Archives of Guizhou Province, Guizhou, Guiyang 550004, China;2. Land Satellite Remote Sensing Application Center, Ministry of Natural Resources, Beijing 100048, China;3. School of Geomatics, Liaoning Technical University, Fuxin 123000, China;4. Beijing Institute of Spacecraft System Engineering, Beijing 100094, China;5. College of Geomatics, Shandong University of Science and Technology, Qingdao 266590, China |
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| Abstract: | The positioning accuracy of the ground spot footprints is highly dependent on the positioning accuracy of the laser pointing angle. The centroid extraction and its variation law of space-borne laser spot are of important significance to the analysis of laser pointing angle. Firstly, based on the laser profile array(LPA) image data of ICESat/GLAS, this paper uses the gray-scale first-order matrix method to extract the centroid of LPA, with an accuracy better than 0.3 pixels, and the relative positioning accuracy of LPA is better than 0.11 pixels . next, Fourier transform and Fourier series fitting are used for periodic detection and modeling analysis of LPA centroid coordinates changes. The results show that the centroid coordinates of the laser spot image have four obvious periodic changes: 1.83×10-4 Hz,3.36×10-4 Hz,5.19×10-4 Hz and 6.71×10-4 Hz. The correlation R2 of fitting results reached 0.86, and the fitting accuracy was up to 0.4″, which was better than 0.13 pixels, and a better result was obtained. It can provide reference for the data processing of GF-7 and the subsequent satellite laser altimeter. |
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