METHODS OF PREVENTING UNAUTHORIZED ELECTRONIC ATTACKS  ON THE NAVIGATION SYSTEM
OF THE AIRCRAFT OF CIVIL AVIATION 

Zatuchnyy Dmitriy Aleksandrovich,  candidate of technical sciences, professor, sub-department of calculable machines, complexes, systems and networks, Moscow State Technical University of Civil Aviation (125993, 20 Kronshtadtskiy avenue, Moscow, Russia), zatuch@mail.ru

621.396.98.004.1

10.21685/2307-4205-2018-1-3

In this article, methods of combating various organized radio-technical impacts on the navigation systems of a civil aviation aircraft are considered. The noticeably increasing activity of various terrorist groups highlights the problems of ensuring the security of both the country as a whole and its separate branches of economic activity. Naturally, this refers to the provision of safety in transport, and in particular in civil aviation. At the present time, it is possible to assume a possible and, most likely, objectively natural, new direction in terrorist activities related to the infliction of radio-technical strikes on the navigation systems for ensuring the flight of aircraft. Classification of interference to the functioning of the civil aviation aircraft navigation systems was carried out. The organized interference to the operation of the civil aviation aircraft navigation systems is divided into interference, with the aim of completely destroying the navigation message and imitating the navigation signal. The possibility of terrorists posing blocking interference is justified, since the signal strength of the satellite radio navigation system is rather small and therefore they are completely vulnerable to suppression even by transmitters operating with low power. The method of counteraction to obstructive interference affecting navigation systems of civil aviation aircraft is given, in the case of terrorist radio-technical attacks based on the use of the property for
narrowband systems, connected with the presence of gaps in their directional pattern. A method for determining and rejecting navigation interference by analyzing signal space is presented. This method differs from the method of phase array antennas, where the procedure for suppressing the interference signal is based on creating a certain dip in the radiation pattern by subtracting the weighted sum of antenna signals, determined as peripheral signals from the main antenna signal. The results of the experiment on suppression of interference noise are presented. The method of rejecting such a noise based on the integrated use of the reception indicator of the satellite radio navigation system and the inertial navigation system is considered. The method of rejecting such a noise based on the integrated use of the reception indicator of the satellite radio navigation system and the inertial navigation system is considered. The method is based on the solution of the inverse navigation problem, which consists of two stages. Initially, the coordinates of the aircraft
are calculated using the inertial navigation system and translating them into equivalent pseudo-ranges. At the second stage, these pseudoranges are compared with pseudoranges computed from the satellite radio navigation system. If this difference exceeds a certain tolerance value, then this signal is excluded from the processing.

organized navigation noise, imitation of the navigation signal, detection and rejection of navigational interference, obstructive interference, pseudo-range