Method and device for distance measurement

A device for distance measurement, comprising:

• a signal source generating a high-frequency signal, the high-frequency signal being a linear frequency-modulated signal;
• a transceiver transmitting the high-frequency signal to an object and receiving a return signal reflected from the object;
• a demodulator generating a demodulation signal as a function of the received return signal and the high-frequency signal, a frequency of the demodulation signal corresponding to a difference between a frequency of the high-frequency signal and a frequency of the return signal;
• and
• an analyzing unit located downstream from the demodulator determining a distance between the device and the object, the analyzing unit including:
• a signal model generating an estimation signal for the demodulation signal, the estimation signal having an assumed frequency and a phase, the phase being determined by at least one variable model parameter,
• a comparator generating an estimation error as a function of a comparison between the demodulation signal and the estimation signal,
• a first arrangement adaptively varying the at least one variable model parameter to reduce the estimation error,
• a second arrangement determining a change in the phase of the estimation signal resulting from the adaptive variable of the at least one variable model parameter,
• a third arrangement correcting the assumed frequency of the estimated signal to correspond to the change of the phase of the estimation signal over time, and
• a fourth arrangement determining the distance to the object as a function of the corrected assumed frequency.