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SIGNALS PROPAGATION DELAYS IN SATELLITE COMMUNICATION NETWORKS
Victor S. Aleshin, Moscow Technical University of Communications and Informatics,
Moscow, Russia, abc082012@yandex.ru
Stanislav G. Dogaev, Moscow Technical University of Communications and Informatics, Moscow, Russia, sdogaev@mail.ru
Abstract
A theoretical comparison of satellite communication networks built on the basis of different orbital groupings is carried out by the criterion of the total delay time of signals propagation in the space and ground segments of networks. For correct comparison, it is proposed to use the weighted average time of propagation, taking into account the number of earth stations located at different distances from the satellite. The corresponding dependences of the average time of signal propagation in the satellite communication radiolines for different heights of orbital groupings on the given minimum angle of the satellite visibility are given. The comparison was made with respect to various options for the construction of a non-geostationary satellite communication network in the interests of the Russian Federation, including: in a high-elliptical orbit («Molniya») with an apogee of about 40 thousand km, as well as in medium and low circular orbits with a height of 8000, 1400, 780 and 600 km. At the same time, all the earth stations were planned to be located only on the territory of Russia. It is shown that the decrease in the height of the orbital grouping of satellites by more than 50 times (with a corresponding increase in the number of satellites) leads to a decrease in the average time of propagation of signals in the satellite communication network only 4…5 times. Thus, the widespread view that delays in the transmission of messages are significant only for geostationary, high-elliptical, to a lesser extent for medium, but not for low orbits is refuted. Specific examples show that this is true only for links of satellite, but not for communication networks that include both multi-satellite orbital and terrestrial segments.
Keywords: satellite communication networks, spacecraft, ground station, orbital grouping, satellite radio communication, message delay, propagation delay, inclined range, seat angle.
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Information about authors:
Victor S. Aleshin, Ph.D, senior scientific researcher, leading scientific employee of MTUCI, Moscow, Russia
Stanislav G. Dogaev, Ph.D, head of research department of MTUCI, Moscow, Russia