Laser pointing changes detection method for space-borne laser spot image

doi:10.11947/j.AGCS.2020.20190423

Abstract

Abstract: The positioning accuracy of the ground spot footprints is highly dependent on the positioning accuracy of the laser pointing angle. The centroid extraction and its variation law of space-borne laser spot are of important significance to the analysis of laser pointing angle. Firstly, based on the laser profile array(LPA) image data of ICESat/GLAS, this paper uses the gray-scale first-order matrix method to extract the centroid of LPA, with an accuracy better than 0.3 pixels, and the relative positioning accuracy of LPA is better than 0.11 pixels . next, Fourier transform and Fourier series fitting are used for periodic detection and modeling analysis of LPA centroid coordinates changes. The results show that the centroid coordinates of the laser spot image have four obvious periodic changes: 1.83×10^-4 Hz,3.36×10^-4 Hz,5.19×10^-4 Hz and 6.71×10^-4 Hz. The correlation R² of fitting results reached 0.86, and the fitting accuracy was up to 0.4″, which was better than 0.13 pixels, and a better result was obtained. It can provide reference for the data processing of GF-7 and the subsequent satellite laser altimeter.

Key words: satellite laser altimetry, ICESat/GLAS, LPA centroid extraction, Fourier transform, Fourier series modeling

CLC Number:

P227

YANG Xiongdan, LI Guoyuan, WANG Peixian, CHEN Jiyi, MO Fan, ME Jiaqi, JIN Zelin. Laser pointing changes detection method for space-borne laser spot image[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(12): 1591-1599.

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