镜筒热形变对星敏感器测量精度的影响

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Effect of Barrel’s Thermal Deformation on Measurement Error of a Star Sensor

LIU Haibo¹;HAO Yuncai²;TAN Jichun¹;TAN Wei¹;LIU Yiwu²

1.National University of Defense Technology;2.Beijing Institute of Control Engineering

Received:1900-01-01 Revised:1900-01-01 Online:2008-10-25 Published:2008-10-25

Abstract

Abstract: Measurement error of a star sensor is restricted by varying ambient temperature and solar irradiance.Effect of barrel’s thermal deformation on measurement error of a star sensor is analysed in this paper.The tilting and shifting of the lens caused by barrel’s thermal deformation are calculated for a typical optical system of star sensor.Displacement of star image point and its energy distribution are analyzed.When barrel’s temperatures change uniformly 20℃,measurement errors of the star sensor are about 0.6″ and 0.9″ for cylindrical and conical barrel respectively.When temperature differences of barrel are 30℃,measurement errors are about 2.2″ and 3.3″ for cylindrical and conical barrel respectively.Results show that cylindrical barrel’s thermal stabilization is better than conical barrel’s.

Key words: star sensor, measurement error, thermal-optical analysis, barrel

CLC Number:

V447

LIU Haibo¹;HAO Yuncai²;TAN Jichun¹;TAN Wei¹;LIU Yiwu². Effect of Barrel’s Thermal Deformation on Measurement Error of a Star Sensor[J]., 2008, 34(5): 22-25.

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Effect of Barrel’s Thermal Deformation on Measurement Error of a Star Sensor

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