Device and method for reducing noise of external measurement sensor of mobility

A method for reducing noise of an external measurement sensor of mobility including an ultrasonic sensor, said method comprising:

• storing, in a storage unit, measurement values of the external measurement sensor measuring distance values between the mobility and an object outside the mobility;
• generating, by an operation unit, a plurality of functions capable of being derived from the measurement values stored in the storage unit;
• deriving, by the operation unit, a final function having the most measurement values within a first range among the plurality of functions;
• deriving, by the operation unit, an estimated value that is an expected value of the measurement value through the final function;
• and
• selecting, by the operation unit and as a final value, a candidate final value that is closest to the estimated value within a second range, among actual measurement values at a time point corresponding to the estimated value.