High accuracy eliminating image rotation control system for optical telescope

IF 5.4 2区计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS

Control Engineering Practice Pub Date : 2025-04-05 DOI:10.1016/j.conengprac.2025.106342

Wenlin Zhou , BinCheng Li , ChangHui Rao , Jinlong Huang , Junzhang Qian , Ping Jiang , Xin Li

{"title":"High accuracy eliminating image rotation control system for optical telescope","authors":"Wenlin Zhou , BinCheng Li , ChangHui Rao , Jinlong Huang , Junzhang Qian , Ping Jiang , Xin Li","doi":"10.1016/j.conengprac.2025.106342","DOIUrl":null,"url":null,"abstract":"<div><div>When an optical telescope tracks dim celestial bodies, the camera requires a long-time exposure to obtain clear target images. Due to the self-rotation of the Earth, for an alt-azimuth telescope, this will result in a rotation of the field of view. To counteract the rotation, an eliminating image rotation mechanism (EIRM) is required. This paper introduces a new EIRM, which is low cost and easy to install. Due to the unavoidable backlash and nonlinearity of stepper motor, the accurate model of EIRM is difficult to obtain. In order to improve the control accuracy of EIRM, a novel control algorithm based on sigmoid function and speed feed-forward is proposed. Control experiments based on proportional integral (PI) control, Fuzzy-PI and proposed controller were conducted, and the results showed that the proposed algorithm has the smallest tracking error. Lastly, the mechanism is installed on a 1.2-meter aperture optical telescope, and the observation results further demonstrate the effectiveness of this method.</div></div>","PeriodicalId":50615,"journal":{"name":"Control Engineering Practice","volume":"161 ","pages":"Article 106342"},"PeriodicalIF":5.4000,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Control Engineering Practice","FirstCategoryId":"94","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0967066125001054","RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AUTOMATION & CONTROL SYSTEMS","Score":null,"Total":0}

引用次数: 0

Abstract

When an optical telescope tracks dim celestial bodies, the camera requires a long-time exposure to obtain clear target images. Due to the self-rotation of the Earth, for an alt-azimuth telescope, this will result in a rotation of the field of view. To counteract the rotation, an eliminating image rotation mechanism (EIRM) is required. This paper introduces a new EIRM, which is low cost and easy to install. Due to the unavoidable backlash and nonlinearity of stepper motor, the accurate model of EIRM is difficult to obtain. In order to improve the control accuracy of EIRM, a novel control algorithm based on sigmoid function and speed feed-forward is proposed. Control experiments based on proportional integral (PI) control, Fuzzy-PI and proposed controller were conducted, and the results showed that the proposed algorithm has the smallest tracking error. Lastly, the mechanism is installed on a 1.2-meter aperture optical telescope, and the observation results further demonstrate the effectiveness of this method.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Control Engineering Practice 工程技术-工程：电子与电气

CiteScore

9.20

自引率

12.20%

发文量

183

审稿时长

44 days

期刊介绍： Control Engineering Practice strives to meet the needs of industrial practitioners and industrially related academics and researchers. It publishes papers which illustrate the direct application of control theory and its supporting tools in all possible areas of automation. As a result, the journal only contains papers which can be considered to have made significant contributions to the application of advanced control techniques. It is normally expected that practical results should be included, but where simulation only studies are available, it is necessary to demonstrate that the simulation model is representative of a genuine application. Strictly theoretical papers will find a more appropriate home in Control Engineering Practice''s sister publication, Automatica. It is also expected that papers are innovative with respect to the state of the art and are sufficiently detailed for a reader to be able to duplicate the main results of the paper (supplementary material, including datasets, tables, code and any relevant interactive material can be made available and downloaded from the website). The benefits of the presented methods must be made very clear and the new techniques must be compared and contrasted with results obtained using existing methods. Moreover, a thorough analysis of failures that may happen in the design process and implementation can also be part of the paper. The scope of Control Engineering Practice matches the activities of IFAC. Papers demonstrating the contribution of automation and control in improving the performance, quality, productivity, sustainability, resource and energy efficiency, and the manageability of systems and processes for the benefit of mankind and are relevant to industrial practitioners are most welcome.