Method for correcting pointing errors of biaxial rotation system based on spherical cap function

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United States of America

PATENT NO 12265407
APP PUB NO 20220404844A1
SERIAL NO

17775472

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Abstract

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The invention discloses a method for correcting the pointing errors of a biaxial rotation system based on the spherical cap function, comprising: error collection: selecting stars or radio sources distributed evenly in a star catalogue for tracking and observation to obtain the theoretical position and measurement position of the stars, and subtracting the measurement positions and the theoretical positions to obtain the error distribution; error model fitting: selecting a suitable orthogonal spherical cap function for the obtained error distribution and performing fitting to calculate an error fitting coefficient, the orthogonal spherical cap function model comprising a hemispheric harmonic function HSH, a Zernike spherical cap function ZSF, and a longitudinal spherical cap function LSF; and error control and compensation: putting the error model and the related fitting coefficient into a pointing control system for compensation. In the present method for correcting the pointing errors of a biaxial rotation system based on a spherical cap function, the model has strong stability and is not easily affected by measurement noise; there is no need to determine the form of the model on the bases of the frame form of the telescope, and the correction accuracy is high.

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Patent Owner(s)

Patent OwnerAddress
NANJING INSTITUTE OF ASTRONOMICAL OPTICS & TECHNOLOGY NATIONAL ASTRONOMICAL OBSERVATORIES CASNO 188 BANCANG STREET XUANWU DISTRICT NANJING JIANGSU PROVINCE 210042 NANJING CITY JIANGSU PROVINCE 210042

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Li, ying Jiangsu, CN 869 31412
Liang, Bin Jiangsu, CN 102 156
Tang, Lifeng Jiangsu, CN 1 0
Wu, Zhaoxiang Jiangsu, CN 1 0
Zheng, Yi Jiangsu, CN 394 5149

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