Evaluation concept for distance measuring processes

摘要

A process for determining the distance (D) between a distance sensor and an object. A transmitter sends wave pulses with a predetermined first frequency fb 1 and the wave pulses reflected by the object are received by a receiver and are directed in the form of an analog electrical incoming signal to an A-D converter. The latter scans the incoming signal with a second frequency f2 with f2>f1 and converts it into a digital signal Z(t) which is evaluated for determining a distance value (D) in the following manner:a) Evaluation of the digital signal Z(t) for determining a first wave pulse propagation time (T1);b) k-fold repetition of the step a) for determining the total k wave pulse propagation times (T1, T2, . . . , Tk);c) Calculation of a mean wave pulse propagation time (T=(T1+T2+ . . . +Tk)/k); andd) Calculation of the distance value (D) in accordance with D-v=T/2.