Accuracy is an important factor in air traffic management which is why high requirements are necessary for each navigation system. The aim of this article is to describe the principles of the RelNav system and telemetry and their accuracy. We present the algorithms of the relative navigation system, which could be used for air traffic control in the case of the unavailability of satellite navigation system signals. This article sums up the different positioning methods, and deals with the accuracy of the relative navigation system (RelNav). Furthermore, the article considers the factors that influence the positioning accuracy. For this task, a computer simulation was created to evaluate the accuracy of the telemetric method. Next, we discuss the principles of telemetry and algorithms for calculating the position of the flying object (FO).

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The novel coronavirus SARS-CoV-2 caused a worldwide pandemic of COVID-19. To halt its spread, countries around the world have gradually reduced international traffic, closed down operations and imposed social distancing rules. Aviation is one of the sectors that has experienced these restrictions in great intensity. The article describes the specific problems encountered by air carriers as well as airports, aircraft manufacturers and other sectors directly linked to the existence of the aviation industry. The second part of the article focuses on the comparison with previous crises of different origin using aggregated data about world air transportation. Based on this we evaluate the prospects for the aviation industry. We conclude, that the recovery from the current crisis in aviation will depend on the economic recovery as well as restoring the confidence of the travelling public.

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