| 摘要 |
<p>The pulse-Doppler-radar appts. uses the analogue echo signals received, plus the receiver noise, and digitalises them in an analogue-digital converter (ADW) feeding them to a doppler filter (DF). The signals emanating from the moving target are the only ones at the output side of the filter (DF) and these are fed into a video rectifier (VG). These rectified signals are then integrated in an integrating circuit (NI), matched to the antenna function, in order to raise the signal-to-noise ratio. A threshold circuit (WS), discriminates them as to whether the output signals from the integrator (NI) should be suppressed as a noise signal, or fed to a visual display unit as signals received from a target. This circuitry suppresses any permanent echo and improves the signal-to-noise ratio, by its method of signal processing.</p> |
