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19 August 2019 High-efficiency calibration of star sensor based on two-dimensional Dammann grating
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Aiming to address the low efficiency of the traditional calibration method for star sensors, we propose a calibration method using two-dimensional (2-D) Dammann grating, which can generate a dot array with uniform intensity and a certain interval. This method is based on theoretical analysis of the diffraction angles of 2-D Dammann grating relative to the tilt angles of incident light. We calculate the angles using a fitting method and further calculate the geometric parameters, such as principal point and principal distance of the star sensor. Finally, we establish a calibration system using 2-D Dammann grating and a nanostar sensor with a 25-mm focal length and 15-deg full field of view has been calibrated. The results show that the calibration accuracy for single-star measurement is better than 6 arc sec, which satisfies the requirement for high-efficiency star sensor calibration and validates the proposed method.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Kun Zhang, Xing Zhong, Wei Wang, Yao Meng, and Chi Ma "High-efficiency calibration of star sensor based on two-dimensional Dammann grating," Optical Engineering 58(8), 085104 (19 August 2019).
Received: 15 March 2019; Accepted: 31 July 2019; Published: 19 August 2019


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