1. SCAR AAA
2. Publications
3. Publications list
4. Publications for 2018
5. Accuracy Analysis of the Po...

Publication
Accuracy Analysis of the Pointing and Focusing Calibration of the 5 m Terahertz Telescope for Dome A in Antarctica

Kang, H. R. et al., 2018, Acta Astronomica Sinica, 59, 17 | View on ADS (2018AcASn..59...17K)

Abstract

Pointing calibration and sub-reflector focusing are important task of antenna measurements, which significantly contribute to the observational performance of radio telescopes. According to the pointing accuracy and defocusing gain loss requirements of the 5 m Dome A Terahertz Explorer (DATE5), this paper has derived the requirements of signal-to-noise ratio for pointing and sub-reflector focusing calibration observations, and selected several astronomical radio sources suitable in terahertz band for pointing and focusing calibrations in Antarctica, which include planets and ultracompact HII regions. The effects of the atmospheric absorption and the source angular diameter on the calibration-measurement errors are analyzed. Simulations show that, when the telescope operates in Antarctica, these sources could provide sufficient flux density for verifying the pre-established pointing model and the focusing model.