Drones that work with RF communications can be tracked using RF sensors, while others that are pre-programmed with GPS for a reference point can be tracked using radar detection. Visual detection technology, such as swivel, tilt and zoom (PTZ) cameras, can be used to obtain images of the detected drone and confirm the threat of a drone. Another and the best way to detect a drone at night is by tracking its radio frequencies, since they always emit radio signals. The drone's live broadcast is usually on a distant radio frequency and some equipment, such as an anti-drone radio frequency detector, is needed to track it.
The easiest way to tell if a drone is flying nearby is to search for a small plane. Drones aren't always easy to see with the naked eye, but they can range in size from the size of a bird to much larger than a passenger plane.