高分七号星载激光定位模型构建与验证  

Construction of ageo-location model and verification of GF-7 spaceborne laser altimetry

作　　者：陈新阳 乔志远[1] 龙小祥 李庆鹏[1] 刘啸添 钟慧敏[1] 王小燕[1] 王建华 CHEN Xinyang;QIAO Zhiyuan;LONG Xiaoxiang;LI Qingpeng;LIU Xiaotian;ZHONG Huimin;WANG Xiaoyan;WANG Jianhua(China Centre For Resources Satellite Data and Application,Beijing 100094,China;China Siwei Surveying and Mapping Technology Co.Ltd.,Beijing 100094,China;Aerospace Information Research Institute,Chinese Academy of Science,Beijing 100094,China)

机构地区：[1]中国资源卫星应用中心,北京100094 [2]中国四维测绘技术有限公司,北京100094 [3]中国科学院空天信息创新研究院,北京100094

出　　处：《遥感学报》2023年第5期1228-1237,共10页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点研发计划(编号:2018YFA0605500,2016YFB0501400)~。

摘　　要：高分七号卫星是中国第一颗搭载全波形激光测高仪的对地观测卫星,可满足立体测绘的需求。本文为了实现国内第一颗星载大光斑全波形激光测高仪数据高精度自主处理的要求,提出了高分七号星载激光定位和检校验证方法。首先,构建了高分七号卫星激光测高仪的严密几何定位模型,其次,使用了移动重心和波形分解的峰值提取法,然后实现了基于地形匹配与红外探测器结合的激光测高仪指向角标定,最后,建立了SRTM高程验证、湖面高程验证和野外定标场验证结合的激光测高仪综合高程验证方法。经验证激光测高数据在平地的测高精度优于0.15 m,激光器1指向角误差约为0.15″,激光器2指向角误差约为0.38″。结果表明本文提出的高分七号星载激光定位方法定位精度高,可以满足后续高分七号数据科学研究和大规模业务化应用的要求。Spaceborne laser altimeter plays an important role in stereo mapping services and in the measurement of ice caps,vegetation height,sea surface,and so on.Spaceborne laser altimetry,an Earth observation technology,has been widely used in America for about 20 years.However,China has used only experimental spaceborne laser altimetry for Earth observation.GF-7 is the first Earth observation laser altimeter of China,and it is equipped with full-waveform lidar.The data of spaceborne laser altimeters can be regarded as control points to realize the requirement of 1∶10000 stereoscopic mapping under the condition of few control points.In this study,a spaceborne laser altimetry geo-location model and an on-orbit geometric calibration and verification method are proposed to meet the high processing precision requirement of the first full-waveform spaceborne laser altimeter of China and realize the localization of geometric positioning and data processing for full-waveform spaceborne laser altimetry.First,a rigorous geometric model for the GF-7 spaceborne laser altimeter is built.Second,the peak value extraction method of moving the center of gravity and waveform decomposition are used.Third,the calibration method of the GF-7 spaceborne laser beam is established based on terrain matching and infrared detection.Lastly,comprehensive validation methods,including SRTM(Shuttle Radar Topography Mission)elevation verification,lake elevation verification,and calibration site elevation verification,are put forward to verify the positioning accuracy of the spaceborne laser altimeter comprehensively.The suitable data of the GF-7 spaceborne laser altimeter in Neimenggu Province and Qinghai Lake are selected,and IR detectors are placed in a field in Neimenggu Province.A series of on-orbit geometric calibration and verification experiments are conducted.The experiments show that the corresponding pointing angle error of Laser 1 is about 0.15",and that of Laser 2 is about 0.38".After correcting the pointing angle error,the height measurem

关 键 词：高分七号 激光测高仪 严密几何模型 几何检校 精度验证 

分 类 号：P2[天文地球—测绘科学与技术]