A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy

Joint Authors

Lian, Peiyuan
Xu, Qian
Xue, Song
Ma, Kaitong
Wang, Congsi
Yan, Yuefei
Zheng, Yuanpeng
Wang, Na
Wang, Yan

Source

International Journal of Antennas and Propagation

Issue

Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-16, 16 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2020-11-23

Country of Publication

Egypt

No. of Pages

16

Main Subjects

Electronic engineering

Abstract EN

The purpose of this paper is to investigate a large radio telescope support point number effect on its pointing accuracy and provide a useful guideline for the large radio telescope 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.

American Psychological Association (APA)

Xue, Song& Ma, Kaitong& Lian, Peiyuan& Wang, Yan& Xu, Qian& Wang, Na…[et al.]. 2020. A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy. International Journal of Antennas and Propagation،Vol. 2020, no. 2020, pp.1-16.
https://search.emarefa.net/detail/BIM-1168761

Modern Language Association (MLA)

Wang, Na…[et al.]. A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy. International Journal of Antennas and Propagation No. 2020 (2020), pp.1-16.
https://search.emarefa.net/detail/BIM-1168761

American Medical Association (AMA)

Xue, Song& Ma, Kaitong& Lian, Peiyuan& Wang, Yan& Xu, Qian& Wang, Na…[et al.]. A Conceptual Investigation of a Large Radio Telescope Support Point Number Effect on Its Pointing Accuracy. International Journal of Antennas and Propagation. 2020. Vol. 2020, no. 2020, pp.1-16.
https://search.emarefa.net/detail/BIM-1168761

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1168761