High-precision compensation and calibration method for four-quadrant analog sun sensor

doi:10.3785/j.issn.1008-973X.2021.10.022

Journal of ZheJiang University (Engineering Science)

2021, Vol. 55

Issue (10): 1993-2001 DOI: 10.3785/j.issn.1008-973X.2021.10.022

High-precision compensation and calibration method for four-quadrant analog sun sensor

Hua-jian DENG1,2(

),Hao WANG1,2,*(

),Ben-dong WANG1,2,Zhong-he JIN1,2

1. Micro-Satellite Research Center, Zhejiang University, Hangzhou 310027, China
2. Key Laboratory of Micro-Nano Satellite Research, Zhejiang Province, Zhejiang University, Hangzhou 310027, China

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Abstract

A high-precision error compensation method was proposed for the four-quadrant analog sun sensor in order to improve the accuracy of the micro-nano satellite attitude determination system. A completely automated calibration process was designed. The process of measuring the photogenerated current of the four-quadrant silicon photocell was analyzed, and the projection relationship of the incident sunlight was modeled to extract the main error sources. All aspects of the process were considered, and the current measurement errors in each channel were separately corrected. The errors caused by machining and installation errors and the errors caused by neglecting the thickness of the optical mask were compensated, which formed a complete compensation method. The experimental results showed that machining and installation errors were the main error sources, and the influence of the error caused by neglecting the thickness of the optical mask was slightly greater than that of the current measurement error. The average accuracy before compensation was 3.072° (1σ) within ±40° of incident angle, and the average accuracy was 0.177° (1σ) after compensation. The accuracy after calibration of the existing method was 0.5°(1σ). The calibration accuracy of the proposed method was improved by about three times compared with the existing method. A set of automated calibration test method for the whole process was designed aiming at the production process of calibration test, which obviously improved the calibration efficiency and was suitable for mass application.

Key words： four-quadrant sun sensor error analysis compensation calibration

Received: 05 December 2020 Published: 27 October 2021

CLC:

V 241

Fund: 国家杰出青年基金资助项目（61525403）

Corresponding Authors: Hao WANG E-mail: denghuajian@zju.edu.cn;roger@zju.edu.cn

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Cite this article:

Hua-jian DENG,Hao WANG,Ben-dong WANG,Zhong-he JIN. High-precision compensation and calibration method for four-quadrant analog sun sensor. Journal of ZheJiang University (Engineering Science), 2021, 55(10): 1993-2001.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2021.10.022 OR https://www.zjujournals.com/eng/Y2021/V55/I10/1993

四象限模拟太阳敏感器的高精度补偿标定方法

为了提高微纳卫星的定姿精度，针对四象限模拟太阳敏感器提出高精度误差补偿方法，设计完整的自动标定流程. 分析四象限硅光电池片光生电流的测量过程，将太阳光入射后的投影关系进行建模，提取主要误差源. 综合考虑各环节，对各路电流测量误差进行单独矫正，对机械加工与安装误差和忽略遮光罩厚度导致误差进行补偿，形成了完备的补偿方法. 实验结果表明，机械加工与安装误差为主要误差源，忽略遮光罩厚度导致误差的影响略大于电流测量误差的影响. 应用该方法在±40°视场范围内补偿前平均精度为3.072°（1σ），补偿后平均精度为0.177°（1σ），现有其他方法标定后精度为0.5°（1σ），提出方法的精度提升了约3倍. 针对标定测试工序，设计全流程自动化标定测试方法，效率明显提高，适合大批量应用.

关键词： 四象限, 太阳敏感器, 误差分析, 补偿, 标定

Fig.1 Schematic diagram of measurement process of four-quadrant analog sun sensor

Fig.2 Measurement process of analog sun sensor photocurrent

Fig.3 Influence of response coefficient of silicon photodiode 1 on precision of analog sun sensor

Fig.4 Schematic diagram of sunlight incidence from third quadrant (α = 25°, β = 25°)

Fig.5 Influence of optical mask thickness on precision of analog sun sensor

Fig.6 Calibration and parameter injection process of analog sun sensor

Fig.7 Calibration system of sun sensor

Fig.8 Block diagram of sun sensor calibration system

Fig.9 Data distribution of calibration points and evaluation points

Fig.10 Deviation angle distribution of analog sun sensor

Tab.1 Accuracy evaluation of analog sun sensor after calibration

Fig.11 Accuracy evaluation of analog sun sensor after calibration


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