Influence of the Type of the Underlying Surface Forest Cover on the Level of SNS Radio Signals Reflected from the Surface at Low-Altitude Aircraft Flight

The purpose of the study was to analyze the influence of the type of the underlying surface forest cover on the level of SNS radio signals reflected from the surface and, accordingly, on the aircraft user equipment efficiency at low-altitude flying. By mathematical simulation, we analyzed the dependences of the signal-to-noise ratio on the elevation angle of navigation spacecraft of the working constellation and the aircraft flight altitude for different types of forest cover. Findings of research show that the rugged barren terrain is characterized by the highest noise level, while the lowest noise level is typical for the thin forest. This can be explained by the fact that most electromagnetic waves penetrate deep into the forest, where they are absorbed due to multiple reflections. Moreover, the thicker the forest cover, the lower the degree of absorption and the higher the noise level

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