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

  • role： First author第一作者
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

    China Siwei Surveying and Mapping Technology Co. Ltd., Beijing 100094, China

  • Email：chenxinyang@chinasiwei.com
  • Introduction：陈新阳，研究方向为星载激光、光学数据处理与应用。E-mail： chenxinyang@chinasiwei.com
CHEN Xinyang12,  
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

QIAO Zhiyuan1,  
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

LONG Xiaoxiang1,  
  • role： Corresponding author通信作者
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

  • Email：liqingpeng@chinasiwei.com
  • Introduction：李庆鹏，研究方向为卫星高精度测绘的理论方法与应用。E-mail： liqingpeng@chinasiwei.com
LI Qingpeng1*,  
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

    China Siwei Surveying and Mapping Technology Co. Ltd., Beijing 100094, China

LIU Xiaotian12,  
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

ZHONG Huimin1,  
  • Affiliation：

    China Centre For Resources Satellite Data and Application, Beijing 100094, China

WANG Xiaoyan1,  
  • Affiliation：

    Aerospace Information Research Institute, Chinese Academy of Science, Beijing 100094, China

WANG Jianhua3

résumé

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.

mots-clés

GF-7 satellite;Laser altimeter;Rigorous geometric model;Geometric calibration;accuracy verification

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