| 摘要 |
<p>PURPOSE:To enable clear display of signals, by arranging an A/D conversion means, a plurality of memory means and an analog addition means to remove noise components while improving the S/N ratio of signal components with the extension of the amplitude thereof. CONSTITUTION:This apparatus is provided with an A/D converter 14 which quantizes a received signal obtained by each radiation of a wave pulse into a digital signal of 1 or 0 with the set level as basis, memory means 25A-25E which memorize received signals with the cycle differing from the radiation cycle of the wave pulse among those outputted therefrom separately and an analog addition means 26 which add up the received signal simultaneously read from the means 25A-25E to obtain a video signal larger in the level than noise signals. With such an arrangement, the signal components are analog added mutually to increase the amplitude thereof by integration. On the other hand, noises below the quantization level are removed among the noise components. Besides, since the noise components are not frequently fixed in the receiving point with respect to each radiation cycle of the radio wave, there is less chance for addition of the noise components when received signals with a plurality of cycles are added up. Thus, only the target object can be displayed clearly.</p> |
