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Radio telescope pointing model based on the generalized extended interpolation correction method

KONG De-qing1,2;SHI Hu-li1,2;ZHANG Xi-zhen1;ZHANG Hong-bo1
  

  1. (1. National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, China;
    2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-02-20 Published:2008-01-20
  • Contact: KONG De-qing E-mail:kdq@bao.ac.cn

Abstract: A new pointing error correction model of the radio telescope based on generalized extended interpolation is presented. After the linear pointing correction, the surveying region is divided into spherical Delaunay triangulations, and the whole smooth pointing correction surface is produced by using the high-accuracy generalized extended interpolation approximation method. In every Delaunay triangle, the border points of segmentation can meet the interpolation condition, and by using the surrounding information of joint (including the inner joint) sufficiently, the piecewise best-fitting is obtained. Simulation results using experimental pointing data of the 50m radio telescope show that this model improves the pointing forecast precision by 30.3 percent compared with the linear pointing model.

Key words: radio telescope, pointing error, generalized extended interpolation

CLC Number: 

  • TN820.4