GF-7 dual-beam laser altimeter on-orbit geometric calibration and test verification

doi:10.11947/j.AGCS.2021.20200397

Abstract

Abstract: The GF-7 satellite is carrying the Chinese first dual-beam laser altimeter system for earth observation, aimed at assisting stereo optical cameras to realize 1∶10 000 mapping. Due to the influence of the vibration of the satellite during launch and the difference of environment between space and ground, the calibration values of the altimetry parameters on ground are deviated from the actual values in space. In order to improve the altimetry, a two-step on-orbit geometric calibration scheme from coarse to fine is proposed for the GF-7 dual-beam laser altimeter. Firstly, a single beam laser on-orbit geometric calibration model is constructed to estimate the location of the laser footprints based on the typical waveform analysis, so as to realize the single beam laser rough calibration. Secondly, based on the geometric calibration model of single beam laser, the geometric calibration model of dual-beam laser is constructed. Considering the factors such as atmospheric delay and tidal correction, the spot is captured by ground detector array as the ground control point, and realize the joint precision calibration of dual-beam laser. Finally, the relative and absolute elevation measurement accuracy after calibration was verified by using the laser altimeters data on the calm lake surface and the ground control data. The experimental results show that the relative accuracy of laser elevation measurement of GF-7 satellite is better than 0.06 m (1σ), and the absolute accuracy of laser elevation measurement in flat areas is up to 0.10 m (1σ).

Key words: GF-7 satellite, laser altimeter, accuracy of elevation measurement, on-orbit geometric calibration, accuracy verification

CLC Number:

P237

TANG Xinming, XIE Junfeng, MO Fan, DOU Xianhui, LI Xin, LI Shaoning, LI Song, HUANG Genghua, FU Xingke, LIU Ren, ZHU Guangbin, OUYANG Sida, TANG Hongzhao, CHEN Hui. GF-7 dual-beam laser altimeter on-orbit geometric calibration and test verification[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(3): 384-395.

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