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CONSTRUCTION ALGORITHM FOR RADIO VISIBILITY ZONE OF GROUND RECEIVING STATIONS FOR HIGHLY RELIABLE SPACE RADIO LINKS

A. A. Kascheev, Ph.D. (Tech.), associate professor, Department of Radio Control And Communication, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.
S. I. Gusev, Dr. Sc. (Tech.), Vice-Rector for Science and Innovation, RSREU, Ryazan; This email address is being protected from spambots. You need JavaScript enabled to view it.

The article deals with the problem of constructing a zone of radio visibility for ground receiving stations (GRS), taking into account the reliability of radio link. The aim of the work is to estimate the geographical coordinates of radio visibility zone boundaries taking into account the reliability of radio link. The algorithm to calculate the geographical coordinates of boundaries has been developed. It is based on the comparison of current estimations of signal-to-noise ratio (SNR) at the input of GRS with SNR threshold at various information transmission bit error probabilities. Mathematical expressions are obtained for the conditions of spacecraft entry and exit, and also to estimate minimum angle of excess over the horizon for GRS, taking into account the fact of crossing zone boundary at different reliability of radio link. The influence of information
transmission error probability and the main parameters of radio signal (type and speed of noisecorrecting coding as well as phase manipulation index) on the size of radio visibility zone is studied. Recommendations for calculating the zone for radio links with varying degrees of reliability are given.

Key words: spacecrafts; ground receiving stations; on-board equipment; ground equipment; on-board storage device.

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