| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the expansion of the spectrum of a received wave and to improve the unwanted-wave suppressing characteristic of a radar equipment having an MTI and the like. SOLUTION: The transmitted wave generated by a transmitter 10 is inputted into a receiver 40 through a D/C 15, a CIR 20 and the like. The frequency displacement of the wave is detected with a frequency discriminator 42 through a frequency converting circuit 44. The displacement is outputted through an A/D circuit 4. In a frequency-displacement correcting circuit 100, an FFT circuit 110 converts the received wave of the receiver 40 into the frequency axis. A filter coefficient circuit 120 operates the filter coefficient value for correcting the frequency from the frequency displacement data of the transmitted wave and applies the value on the receiving period within the same-pulse repeating time. A multiplier 130 multiplies the received wave and the filter coefficient and performs the correction. An IFFT circuit 140 converters the received wave of the frequency axis to the time axis. Therefore, the expansion of the RX spectrum is suppressed, and the unwanted-wave suppressing characteristic at an MTI 50 is improved.</p> |
