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Department光电工程总体研究室(一室)
Analysis of the Subdivision Errors of Photoelectric Angle Encoders and Improvement of the Tracking Precision of a Telescope Control System
Yu, Jiawei1,2,3; Wang, Qiang1,2; Zhou, Guozhong1,2; He, Dong1,2; Xia, Yunxia1,2; Liu, Xiang1,2; Lv, Wenyi1,2,3; Huang, Yongmei1,2
Source PublicationSENSORS
Volume18Issue:9Pages:2998
2018-09-01
Language英语
ISSN1424-8220
DOI10.3390/s18092998
Indexed BySCI ; Ei
WOS IDWOS:000446940600257
EI Accession Number20183805818558
SubtypeJ
AbstractPhotoelectric 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.
Keywordtelescope control systems photoelectric angle encoders tracking precision subdivision errors amplitude error real-time compensation
WOS KeywordOPTICAL ENCODERS ; COMPENSATION
EI KeywordsControl systems ; Phase noise ; Photoelectricity ; Real time systems ; Signal encoding ; Telescopes ; Traction control
EI Classification Number701.1 Electricity: Basic Concepts and Phenomena ; 701.2 Magnetism: Basic Concepts and Phenomena ; 716.1 Information Theory and Signal Processing ; 722.4 Digital Computers and Systems ; 731.1 Control Systems ; 731.2 Control System Applications
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Document Type期刊论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/9369
Collection光电工程总体研究室(一室)
Affiliation1.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
Recommended Citation
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.
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