| 摘要 |
<p>The device includes a filter which operates by means of real time attenuation on a high quantity of data, in function of the Doppler spectrum, of the spacial density and of the temporal stationariety. The device consists of a Doppler filter bank, realised by an FFE (Fast Fourier Transformer) algorithm, followed by an area processor on each filter loading a memory, based on a phenomenon. The content of the memory is used by the scanning antenna which is subsequent to the measuring antenna for an attenuation controlled by the available signal. In this way it is possible to produce an attenuation in the areas of interest and on the only signal interfering with the Doppler frequency of the signal. A suitable hypoteresis of the logic loading the memory excludes the possibility to intervene in the useful paths, although a sufficient adaptivity is maintained to trace phenomena slowly evolving in time.</p> |
