Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System

doi:10.3390/s18092998

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	Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System
	Yu, Jiawei 1,2,3; Wang, Qiang 1,2; Zhou, Guozhong 1,2; He, Dong 1,2; Xia, Yunxia 1,2; Liu, Xiang 1,2; Lv, Wenyi 1,2,3; Huang, Yongmei 1,2
刊名	SENSORS
	2018-09-01
卷号	18 期号:9 页码:2998
关键词	telescope control systems photoelectric angle encoders tracking precision subdivision errors amplitude error real-time compensation
ISSN号	1424-8220
DOI	10.3390/s18092998
文献子类	J
英文摘要	Photoelectric angle encoders, working as position sensors, have a great influence on the accuracy and stability of telescope control systems (TCS). In order to improve the tracking precision of TCS, a method based on subdivision error compensation for photoelectric angle encoders is proposed. First, a mathematical analysis of six types of subdivision errors (DC error, phase error, amplitude error, harmonic error, noise error, and quantization error) is presented, which is different from the previously used analysis based on the Lissajous figure method. In fact, we believe that a mathematical method is more efficient than the figure method for the expression of subdivision errors. Then, the distribution law and period length of each subdivision error are analyzed. Finally, an error compensation algorithm is presented. In a real TCS, the elevation jittering phenomenon occurs, which indicates that compensating for the amplitude error is necessary. A feed-forward loop is then introduced into the TCS, which is position loop- and velocity loop-closed, leading to a decrease of the tracking error by nearly 54.6%, from 2.31 to 1.05, with a leading speed of 0.25 degrees/s, and by 40.5%, from 3.01 to 1.79, with a leading speed of 1 degrees/s. This method can realize real-time compensation and improve the ability of TCS without any change of the hardware. In addition, independently of the environment and the kind of control strategy used, this method can also improve the tracking precision presumably because it compensates the measuring error inside the photoelectric angle encoder.
WOS关键词	OPTICAL ENCODERS ; COMPENSATION
语种	英语
WOS记录号	WOS:000446940600257
内容类型	期刊论文
源URL	[http://ir.ioe.ac.cn/handle/181551/9369]
专题	光电技术研究所_光电工程总体研究室（一室）
作者单位	1.Institute of Optics and Electronics, Chinese Academy of Sciences, No. 1 Guangdian Road, Chengdu; 610209, China; 2.Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu; 610209, China; 3.University of Chinese Academy of Sciences, Beijing; 100049, China
推荐引用方式 GB/T 7714	Yu, Jiawei,Wang, Qiang,Zhou, Guozhong,et al. Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System[J]. SENSORS,2018,18(9):2998.
APA	Yu, Jiawei.,Wang, Qiang.,Zhou, Guozhong.,He, Dong.,Xia, Yunxia.,...&Huang, Yongmei.(2018).Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System.SENSORS,18(9),2998.
MLA	Yu, Jiawei,et al."Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System".SENSORS 18.9(2018):2998.