Line-of-Sight Signal

In the context of aviation, a Line-of-Sight Signal refers to the direct propagation of radio waves between the transmitter and receiver antennas. This type of signal transmission is crucial in aviation communication systems, particularly in aircraft control and navigation. The antennas must be visible to each other without any physical obstructions such as buildings or mountains, hence the term 'line-of-sight'. The signal strength and quality are directly influenced by the distance and altitude between the two antennas. In aviation, line-of-sight signals are used in various systems including VHF Omnidirectional Range (VOR), Instrument Landing System (ILS), and Air Traffic Control (ATC) communication. These systems rely on line-of-sight signals to provide accurate and real-time information for safe and efficient flight operations. However, the limitation of line-of-sight signal is that its range is restricted to the horizon due to the Earth's curvature, which can be overcome by increasing the altitude of the aircraft or using satellite communication.
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