The effect of baseline on the uncertainties of range determination performed by two-site astrometric observations

IF 1.9 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
H.G. Gökay , S. Özdemi̇r , M.N. Bağıran , S. Aydın
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引用次数: 0

Abstract

The uncertainties in range determination depending on two-site locations for GEO satellites were calculated and shown that the uncertainty in the range depends not only on linear baseline distance between the locations but also both latitude and longitude of geographic coordinates of the sites. By taking the first observing site as fixed and changing the location of the second site, the triangulated range calculations were performed by using SGP4 orbital model and published Two-Line Elements (TLE). Additionally, as a sample of triangulated observation, the results of nearly synchronous two-site astrometric measurements of two GEO satellites, TURKSAT 3A and TURKSAT 4A, were presented. These astrometric observations were carried out in TÜBITAK National Observatory (TUG), Antalya and TURKSAT Company’s site, Ankara. Although the baseline between the observatory sites corresponds to a relatively short distance of about 400 km, measured range determinations well stays under the error level expected by Choi et al. (2010).

基线对双站点天体测量观测所进行的测距不确定性的影响:三角测量法的样本案例:土耳其卫星 3A 和土耳其卫星 4A
计算了地球同步轨道卫星根据两个观测点位置确定测距的不确定性,结果表明测距的不确定性不仅取决于两个观测点之间的线性基线距离,还取决于两个观测点地理坐标的经度和纬度。利用 SGP4 轨道模型和已公布的双线要素(TLE),将第一个观测站点作为固定点,改变第二个观测站点的位置,从而进行三角测量测距计算。此外,作为三角测量观测的一个样本,还介绍了对两颗地球同步轨道卫星 TURKSAT 3A 和 TURKSAT 4A 几乎同步进行的双站点天体测量结果。这些天体测量观测是在安塔利亚 TÜBITAK 国家天文台(TUG)和安卡拉 TURKSAT 公司站点进行的。虽然观测站点之间的基线距离相对较短,约为 400 公里,但测得的测距结果仍保持在 Choi 等人(2010 年)预计的误差水平之下。
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来源期刊
Astronomy and Computing
Astronomy and Computing ASTRONOMY & ASTROPHYSICSCOMPUTER SCIENCE,-COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
CiteScore
4.10
自引率
8.00%
发文量
67
期刊介绍: Astronomy and Computing is a peer-reviewed journal that focuses on the broad area between astronomy, computer science and information technology. The journal aims to publish the work of scientists and (software) engineers in all aspects of astronomical computing, including the collection, analysis, reduction, visualisation, preservation and dissemination of data, and the development of astronomical software and simulations. The journal covers applications for academic computer science techniques to astronomy, as well as novel applications of information technologies within astronomy.
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