| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a radar device capable of determining positive/negative of a Doppler frequency or a target angle even when only real signals are obtained as reception signals. <P>SOLUTION: This device comprises: an oscillator 1 generating waves of a plurality of transmission frequencies; an transmission antenna 3; a reception antenna 4; a receiver 5 detecting the received reception waves to generate real reception signals; a Fourier-transformation part 7 Fourier-transforming the real reception signals along a time direction; a spectrum peak detector 8 extracting the peak complex signal value of the Doppler frequency point of which amplitude shows the maximum with inputting the Fourier-transformation results; a distance computing part 9 computing distance to a reflective object from accumulated peak complex signal values to output as a range value after accumulating the peak complex signal values obtained using the plurality of transmission frequencies; and a distance sign determining part 10 outputting the range value computed by the distance computing part according to the determination results and the Doppler frequencies detected by the spectrum peak detector. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
