Method for operating an ultrasonic sensor by excitation with a frequency-coded signal, computer program product and ultrasound sensor

摘要

The invention relates to a method for operating an ultrasound sensor (5a) for a motor vehicle (1), wherein an ultrasound signal (8) in response to an electrical excitation signal of a control device (10) of the ultrasound sensor (5a) by means of a transmitting device (6) of the ultrasonic sensor (5a) ) in an environment (4) of the motor vehicle (1) is emitted and an echo signal (9) of the object (3) in the environment (4) reflected ultrasonic signal by a receiving device (7) of the ultrasonic sensor (5a) is received, and wherein an airborne sound attenuation of the environment (4) by evaluating at least one echo amplitude (E1, E2, E3) of the echo signal (9) is determined, wherein the electrical excitation signal as a frequency-coded electrical excitation signal with a changing frequency (f) is generated and a frequency-dependent first echo amplitude (E1) of the echo signal (9) with a frequency-dependent second echo amplitude (E2) of the same Echosi gnals (9) is compared for evaluation, and depending on the comparison, the airborne sound attenuation is determined. Furthermore, the invention relates to a computer program product (13) and an ultrasonic sensor (5a).