subdivision error analysis and compensation for photoelectric angle encoder in a telescope control system

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ID: 221515
2015
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Abstract
As the position sensor, photoelectric angle encoder affects the accuracy and stability of telescope control system (TCS). A TCS-based subdivision error compensation method for encoder is proposed. Six types of subdivision error sources are extracted through mathematical expressions of subdivision signals first. Then the period length relationships between subdivision signals and subdivision errors are deduced. And the error compensation algorithm only utilizing the shaft position of TCS is put forward, along with two control models; Model I is that the algorithm applies only to the speed loop of TCS and Model II is applied to both speed loop and position loop. Combined with actual project, elevation jittering phenomenon of the telescope is discussed to decide the necessity of DC-type subdivision error compensation. Low-speed elevation performance before and after error compensation is compared to help decide that Model II is preferred. In contrast to original performance, the maximum position error of the elevation with DC subdivision error compensation is reduced by approximately 47.9% from 1.42″ to 0.74″. The elevation gets a huge decrease in jitters. This method can compensate the encoder subdivision errors effectively and improve the stability of TCS.
Reference Key
su2015mathematicalsubdivision Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Yanrui Su;Qiang Wang;Fabao Yan;Xiang Liu;Yongmei Huang
Journal journal of power sources
Year 2015
DOI
10.1155/2015/967034
URL
http://dx.doi.org/10.1155/2015/967034
Keywords
civil engineering (general)mathematics engineering (general)

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