Intelligent ultrasonic system and rear collision warning apparatus for vehicle

An intelligent ultrasonic system comprising:

• an ultrasonic sensor configured to capture an ultrasonic signal and determine, based on one of a plurality of parameters, whether the captured ultrasonic signal is a normal signal reflected from an object or a noise signal, each parameter causing the ultrasonic sensor to operate with a different sensitivity for filtering out the noise signal;
• a data collection unit configured to collect data related to a surrounding circumstance of a road on which a vehicle is located or moving;
• and
• a controller configured to perform:
• operating the ultrasonic sensor based on a first parameter corresponding to a first circumstance surrounding the vehicle, the first parameter being one of the plurality of parameters;
• determining, based on the collected data related to the surrounding circumstance of the road, that the vehicle is surrounded by a second circumstance different from the first circumstance;
• and
• in response to determining that the vehicle is surrounded by the second circumstance, operating the ultrasonic sensor based on a second parameter corresponding to the second circumstance, the second parameter being one of the plurality of parameters.