Which phenomenon may indicate issues with signal clarity, such as fading and distortion?

Multipath propagation is a phenomenon where signals reflect off various surfaces before reaching the receiver, which can lead to multiple versions of the same signal arriving at slightly different times. This can cause constructive and destructive interference, resulting in fading and distortion. Such signal clarity issues can significantly affect the performance and reliability of Unmanned Aircraft Systems (UAS), causing control problems or leading to loss of communication.

Understanding multipath propagation is crucial for UAS operators because it can reveal potential vulnerabilities in signal transmission, particularly in environments with many obstacles or reflective surfaces, like urban areas. Recognizing this phenomenon allows operators to take necessary precautions, such as choosing appropriate flying locations or utilizing equipment designed to mitigate these effects.