Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Correction Method of Tracking Error for Astronomical Telescope Using Recursive Least Square Method

재귀 최소자승법을 이용한 천체 망원경의 추적 오차 보정법

  • 곽동훈 (인하대학교 로봇공학과) ;
  • 김태한 (인하대학교 로봇공학과) ;
  • 이영삼 (인하대학교 로봇공학과)
  • Received : 2011.11.09
  • Accepted : 2012.01.17
  • Published : 2012.03.01
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Abstract

In this paper, we propose a correction method for astronomical telescope using recursive least square method. There are two ways to move a telescope : equatorial operation and altazimuth operation. We must align polar axis of a equatorial telescope with the north celestial pole and adjust the horizontal axis of a altazimuth telescope exactly to match the celestial coordinate system with the telescope coordinate system. This process needs time and expertise. We can skip existing process and correct a tracking error easily by deriving the relationship of the celestial coordinate system and the telescope coordinate system using the proposed correction method. We obtain the coordinate of a celestial body in the celestial coordinate system and the telescope coordinate system and derive a transformation matrix through the obtained coordinate. We use recursive least square method to estimate the unknown parameters of a transformation matrix. Finally, we implement a telescope control system using a microprocessor and verify the performance of the correction method. Through an experiment, we show the validity of the proposed correction method.

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