D’agostino, Francesco AU - Xue, Song AU - Ma, Kaitong AU - Wang, Congsi AU - Lian, Peiyuan AU - Wang, Yan AU - Yan, Yuefei AU - Xu, Qian AU - Zheng, Yuanpeng AU - Wang，Na PY - 2020 DA - 2020/11/23 TI -大型射电望远镜的概念调查支持点数量影响其指向精度SP - 2706309六世- 2020 AB -本文的目的是探讨一个大射电望远镜支持点数量影响其指向精度和大型射电望远镜提供有用的指导design engineer. In a large radio telescope system, the azimuth track is used to support the whole telescope structure and the mounting error as well as the telescope wheel-track contact in a long term can cause unevenness on the azimuth track, which can further deteriorate the telescope pointing accuracy. Even though various compensation methods have been proposed to compensate for this pointing error, it remains as one of the challenges for the telescope pointing error reduction. In this paper, a general telescope pointing error estimation formula has been proposed to investigate different telescope support-point number designs on its pointing accuracy. In this approach, the azimuth track unevenness has been modelled as the Fourier function using the least square method after the raw track profile has been measured. Next, the elevation position matrix, azimuth position matrix, and the azimuth profile matrix can be constructed for different telescope support point numbers, and the telescope pointing error can then be obtained based on the proposed general formula. The telescope pointing error root mean square (RMS) value is used to quantify the effect of the telescope support point number on the pointing accuracy. Two interesting results can be observed in the numerical example. The first one is that the telescope pointing error curves have different dominant peaks during one azimuth track rotation, which is corresponding to the support point number. Another interesting finding is that the RMS value experienced a complex trend with the support point number change, and they are not a simple monotonous increasing or decreasing relationship with the support number. All the results in this paper can provide a useful guideline for reducing the telescope pointing error in the initial design stage. SN - 1687-5869 UR - https://doi.org/10.1155/2020/2706309 DO - 10.1155/2020/2706309 JF - International Journal of Antennas and Propagation PB - Hindawi KW - ER -