The method of GF-7 satellite laser altimeter on-orbit geometric calibration without field site

doi:10.11947/j.AGCS.2022.20200181

Abstract

Abstract: On-orbit geometric calibration without field site is a key problem for future multi-beam laser altimetry satellites. In view of the linear system full waveform laser altimeter loaded on the GF-7 satellite, a non-field step by step calibration method based on terrain and waveform matching is proposed. Based on the analysis of the characteristics of the GF-7 satellite laser altimeter, a rigorous geometric positioning model is constructed. The field-free on orbit geometric calibration test is carried out by using the open topographic reference data and the basic geographic information of DOM and LiDAR DSM in a certain area, which has greatly improved the accuracy of the laser altimetry data. With this method, during the first half of 2020, the calibration parameter configuration and data processing of GF-7 satellite laser altimeter was not affected, even the field calibration can't be implemented due to the negative impact of the COVID-19. The accuracy is compared with the field calibration results after the COVID-19, and the results show that the plane error of the non-field calibration is 11.597±3.693 m and the minimum value is 7.115 m. The elevation accuracy of flat area is better than 0.3 m, although it is slightly lower than the results of field calibration, it can basically meet the requirements of 1:10 000 elevation control points.

Key words: GF-7 satellite, laser altimeter, no-field geometric calibration, terrain matching, waveform matching

CLC Number:

P228.3

LI Guoyuan, TANG Xinming, ZHOU Xiaoqing, LU Gang, CHEN Jiyi, HUANG Genghua, GAO Xiaoming, LIU Zhao, OUYANG Sida. The method of GF-7 satellite laser altimeter on-orbit geometric calibration without field site[J]. Acta Geodaetica et Cartographica Sinica, 2022, 51(3): 401-412.

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