In aviation, what type of signals does a VOR emit?

A VOR, or VHF Omnidirectional Range, emits radio signals that are essential for aircraft navigation. It operates by transmitting two radio signals: one that is constant in phase and another that varies depending on the direction the aircraft is from the VOR station. By comparing these two signals, pilots can determine their bearing relative to the VOR. This allows them to navigate accurately within the coverage area of the VOR.

The radio signals used by VORs are specifically designed for navigational purposes, making them a key tool for pilots to maintain a situational awareness of their position and route. The technology behind VOR allows for reliable guidance, especially in situations where visual references may be lacking, such as over oceans or in poor weather conditions.

In contrast, other options like visual and auditory signals are not associated with VOR operations; VORs do not use infrared signals or satellite signals, which are characteristics of other systems, such as GPS or radar technologies. Thus, the correct answer highlights the specific function of VOR as a navigation aid using radio signals.