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
- 2023年27卷第5期 页码：1228-1237
收稿：2021-04-29，
纸质出版：2023-05-07
DOI： 10.11834/jrs.20221251
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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。
Abstract
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 measurement error of the laser altimeter is better than 0.15 m in the flat area. GF-7
the first spaceborne laser altimeter for Earth observation in China
has good performance. It can realize high-precision positioning and data processing for full-waveform spaceborne laser altimetry.
The results also show that the method in this study has high processing accuracy and realizes the first domestic processing of full-waveform spaceborne laser altimetry data. The processed data can satisfy the requirements of scientific research and subsequent large-scale application. Moreover
the geo-location model for GF-7 and the calibration verification method established in this study can be used for domestic spaceborne laser altimetry in the future.
关键词
Keywords
references
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相关作者
王建华 中国科学院空天信息创新研究院
王小燕 中国资源卫星应用中心
钟慧敏 中国资源卫星应用中心
刘啸添 中国资源卫星应用中心;中国四维测绘技术有限公司
李庆鹏 中国资源卫星应用中心
龙小祥 中国资源卫星应用中心
陈新阳 中国资源卫星应用中心;中国四维测绘技术有限公司
乔志远 中国资源卫星应用中心
相关机构
中国四维测绘技术有限公司
中国资源卫星应用中心
中国南海研究协同创新中心
江苏省地理信息技术重点实验室
南京大学 地理与海洋科学学院
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