| 摘要 |
A device for distance measurement by radar comprises a frequency modulated radar-transmitter and -receiver (10) by which a radar beam is directed onto an object to be measured and in which by mixing the transmitted and the received frequency a beat signal (30) is obtained. By use of frequency modulation (16) the frequency of the transmitted radar signal of the radar-transmitter and -receiver is variable periodically according to a saw tooth function. The frequency of the beat signal, due to the travel time of the radar signal reflected by the object, represents a measured value for the distance of the object. A signal processing circuit generates from the beat signal obtained a measured value of the distance. For this purpose the beat signal is fed into a phase control circuit or phase locked loop circuit (66) the output frequency of which makes the measured value of distance.
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