| 摘要 |
The invention relates to a method for ascertaining a distance of an object (23) from a motor vehicle (1) using a PMD sensor (2), comprising the following steps: in a measurement cycle (9) measuring a phase shift of a measurement signal reflected on the object (23) for at least one modulation frequency, wherein the modulation frequency is selected in such a way that in a range (4) beginning at the motor vehicle (1) a distance can be unambiguously determined from the phase shift, and carrying out a propagation time measurement for an individual signal reflected on the object (23) during a time interval (16) beginning with the transmission of the individual signal and ending at a time corresponding to a double run through the range (4), if a reflected individual signal has been measured during the time interval (16), determining a distance from the phase shift, if no reflected individual signal was measured during the time interval (16), discarding the phase shift without determining a distance. |
