A new calibration model for pointing a radio telescope that considers nonlinear errors in the azimuth axis

查看全文 作　　者：De-Qing [1]Kong;Song-Gen [1,2]Wang;Jin-Qing [3]Wang;Min [4]Wang;Hong-Bo [1]Zhang

机构地区：[1]National Astronomical Observatories,Chinese Academy of Sciences;[2]College of Mechanical Engineering, Hangzhou Dianzi University;[3]Shanghai Astronomical Observatory, Chinese Academy of Sciences;[4]Yunnan Observatories, Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》索引2014年第14卷第6期,共8页

基　　金：Supported by the National Natural Science Foundation of China 摘　　要：A new calibration model of a radio telescope that includes pointing error is presented, which considers nonlinear errors in the azimuth axis. For a large radio telescope, in particular for a telescope with a turntable, it is difficult to correct pointing errors using a traditional linear calibration model, because errors produced by the wheel-on-rail or center bearing structures are generally nonlinear. Fourier expansion is made for the oblique error and parameters describing the inclination direction along the azimuth axis based on the linear calibration model, and a new calibration model for pointing is derived. The new pointing model is applied to the 40 m radio telescope administered by Yunnan Observatories, which is a telescope that uses a turntable. The results show that this model can significantly reduce the residual systematic errors due to nonlinearity in the azimuth axis compared with the linear model. 关键词：大型射电望远镜非线性误差方位轴校准校正模型傅立叶展开云南天文台模型误差

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A new calibration model for pointing a radio telescope that considers nonlinear errors in the azimuth axis

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