| 摘要 |
<p>Apparatus is provided for the suppression of terrain generated clutter in a pulsed weather radar system. Weather induced returns typically having scintillation frequencies greater than 50 Hz may be isolated from terrain backscattered signals utilising a digital filter technique having a sampling rate equal to the pulsed radar PRF. The apparatus comprises signal input means (10c) for providing signal samples representative of received radar signals, the signal samples corresponding to transmitted radar pulses in the pulsed radar, digital processing means (40, 16, 20, 24, 27, 21) coupled to the signal input means (10c) for selectively adding and subtracting successive signal samples and further for multiplying the successive signal samples in accordance with preselected multiplicative constants to provide signals representative of the scintillation frequencies of the received radar signals and means (50) coupled to said digital processor means for comparing the scintillation frequency representative signals with predetermined frequency threshold signals and for providing a compared signal indicative thereof, thereof indicating the presence or absence of terrain generated clutter. </p> |
