Method and device for distance determination between vehicle and obstacle

摘要

The method involves applying time differentiation to a reception signal (11) for generating a derivative signal (14). A predetermined comparison signal (15) is generated which absolute value monotonely decreases with time. The derivative signal is compared with the comparison signal and a timer pulse (17) is output when both signals have the same value. The distance of the obstruction (3) is determined from the time between the transmittion of sample pulses using distance detectors and the output of the imer pulses.