How does the radar indicate a collision?

[DelCamila]

If you can still hear the beeping sound, it means no collision has occurred. Relevant explanations are as follows: 1. Distance indication: The parking sensor indicates the rear distance based on the interval of the beeps: when it first starts beeping, the interval between beeps is long, indicating there is at least 1 meter of distance remaining. The smaller the interval, the closer the vehicle is to the obstacle. 2. False alarms: If the parking sensor gives false alarms and keeps beeping, the first thing to consider is whether there is anything around the radar. If the car is exposed to the elements for a long time, the sensors' environment deteriorates, and without regular attention, they can become covered in dust and dirt.