What does the automatic following system of driverless cars mainly rely on?

[VonBennett]

It determines the distance from the vehicle ahead through wireless signals. Composition of the automatic following system: Vehicle and mobile target carrying device. Working principle: The following car system sends a search signal through the wireless communication module, while the ultrasonic receiver starts timing. If the mobile target receives the wireless search signal, it immediately sends an ultrasonic signal. The triangular ultrasonic receivers of the small car successively receive the ultrasonic signals, and the CPU calculates the distance from the mobile target to the three ultrasonic receiving points based on the time each ultrasonic module receives the signal. The position of the mobile target can be determined using the trilateration algorithm. If the calculated distance is greater than the set distance, the motor is controlled to move toward the target direction. If the calculated distance is less than the set distance, the motor is controlled to stop, thereby achieving the automatic following function of the car.