| 摘要 |
<p>PURPOSE:To provide the same function as a multi-filter with one filter, by sequentially sweeping a mixer in a local oscillating frequency through the use of the mixer and filter. CONSTITUTION:A beat frequency signal BF obtained at a mixer 6 is swept with a mixer 11 according to an output frequency of a local oscillator 10 and a pass band of a filter 12 is determined at each channel. The frequency signal passing through the filter 12 is swept by a mixer 17 with a constant output frequency of a local oscillator 16 to determine the pass band of a filter 18. Thus, the pass frequency band of a filter is sequentially determined, allowing to separate a beat frequency detected with an FM-CW radar main body into a plurality of channels over the entire range.</p> |
