Signal delay in the RadioAstron ground-space interferometer

• Published in: Astronomy reports Vol. 56; no. 12; pp. 984 - 987
• Main Authors: Vlasov, I. Yu, Zharov, V. E., Sazhin, M. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01-12-2012; Springer Nature B.V
• Subjects: Astronomy; Observations and Techniques; Physics; Physics and Astronomy; Scientific apparatus & instruments; Space telescopes; Astronomy Report; Geocentric Coordinate System; Geometric Delay; Space Interferometer; Distant Source
• ISSN: 1063-7729; 1562-6881
• DOI: 10.1134/S1063772912120086

The commissioning of the RadioAstron space radio telescope observing in a radio-interferometer mode with baselines exceeding the baselines of ground-based VLBI systems by more than an order of magnitude requires revision of the formula used to calculate the delay of the arrival of the signal from a distant source to the telescopes in ground-based observations. This formula is derived taking into account all corrections necessary to achieve the required accuracy; numerical estimates of the contributions of all terms are presented.