Echo coding and - decoding of ultrasonic signals with the use of divalent chirp - signals by sign of the frequency change

摘要

The proposed method is used for the determination of a possible for distinguishing feature received ultrasonic signals in a motor vehicle. The ultrasonic signals emitted by the ultrasonic sensors have in their ultrasound pulse packets to a frequency modulation. Preference is given to the frequency change within a ultrasound pulse packet monotonously increasing monotonically rising or almost zero. This is for the coding of the origin of the ultrasound pulse packets used and the decoding. For this purpose, the first time derivative of the measured instantaneous frequency of a received echoes of such an ultrasound pulse packet used.