Abstract. In this work, considering that traditional data processing methods in air traffic control systems in areas with complex terrain—mountainous and foothill regions—often lack sufficient accuracy, which can lead to a decrease in the level of air transport safety and efficiency, it is proposed to develop methods for increasing data processing accuracy under complex noise conditions in mountainous and foothill areas.Taking into account the specific features of the terrain and technical limitations, the main factors affecting the reduction in data processing accuracy operating in mountainous and foothill conditions were identified, including meteorological, radio-technical, topographical, and anthropogenic interference. At the same time, criteria for assessing data processing accuracy under interference loads, as well as system reliability parameters depending on the degree of distortion of information flows, have been introduced and new results have been obtained, which will ensure increased safety and efficiency of air traffic in complex conditions.

Keywords: mountainous regions, interference, navigation, system, terrain, noise.