METHOD AND MEASURING SYSTEM FOR MEASURING DISTANCE BASED ON THE TRANSIT TIME OF COMPENSATED PULSES

摘要

The invention relates to a method for measuring the transit time of a transmission signal (6) through at least a first transmission path of a feedback compensation-based measuring system (100) between at least one first transmitter (7) and at least one receiver (12). In a step, the transmission signal (6) is transmitted to the receiver (12) from the first transmitter (7) into a first transmission path (41) with at least one first transit time, and the compensation signal (19) is transmitted from a second transmitter (20) into a second transmission path (42), the transmission characteristics of the second transmission path (42) being known. In a further step, the overlapping transmission signals (6) and compensation signals (19) are received by means of a receiver (12). Further, a receiver output signal (11) is formed from the overlapping signals (6, 19). As a result of this, a pulse signal (4) is generated with pulses having a pulse interval, said pulse interval being at least double the maximum transit time to be detected of the transmission signal (6), and the pulse duration of the pulse being not more than a quarter of the pulse interval. In addition, the at least one transmission signal (6) is generated by the generated pulses of the pulse signal (4), the compensation signal (19) being controllably delayed or the phase position thereof being varied in relation to the transmission signal (6) of the first transmitter (7). The compensation signal (19) is shaped in such a way and its amplitude corrected such that during summation with the transmission signal (6) of the first transmitter (7) a constant signal (11) is produced on the at least one receiver (12), and at least one transit time or change in transit time is detected on the receiver (12) as a result of the transmission signal (6) from the first transmitter (7) to the receiver (12), which transmission signal is pulsed by the pulses.