| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a Doppler radar receiver circuit enabled to cancel consecutively the effect of the travel speed of a mobile body by using a VCO having a narrow specific frequency band. <P>SOLUTION: The Doppler radar receiver circuit has a mixer, an oscillator for outputting signals oscillating on a single frequency, and a VCO (voltage controlled oscillator). In the receiver circuit, the VCO generates signals of a frequency related to the Doppler frequency of the travel speed of the mobile body, the beat signal and the signal from the oscillator is mixed, and the signal from the VCO is utilized to cancel the effect of the travel speed of the mobile body contained in the beat signal. <P>COPYRIGHT: (C)2003,JPO |
