| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a clutter-restricting apparatus which can lessen a calculation load in relation to calculating a filter coefficient by dividing a clutter-restricting filter to a plurality of filters and longitudinally connecting the filters. SOLUTION: There are provided a clutter center frequency-estimating means 1 for estimating a clutter center frequency from a receiving signal, a first filter coefficient-calculating means 2a for calculating the filter coefficient so as to form a zero point of frequency characteristics of the whole filter to the estimated frequency value, a second filter coefficient-calculating means 2b for calculating the filter coefficient so that the zero point of the filter is allotted to a value with an offset frequency added to the estimated frequency value, an offset frequency-calculating means 4 for calculating the offset frequency, and filter means 3a and 3b for restricting the clutter in the receiving signal with the use of the filter coefficients inputted from the first and the second filter coefficient-calculating means by every different pulse intervals.</p> |
