Dispositif permettant d'améliorer le rapport signal/bruit, notamment dans les radars

摘要

801,236. Pulse radar. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. May 2, 1956 [May 2, 1955], No. 13613/56. Class 40(7). Relates to the method of improving the signal/noise ratio of a pulse radar in which signals received during a first recurrence period are delayed by the recurrence period T and multiplied by the signals received during the next recurrence period. According to the present invention the delay is effected by applying the video signals to the back plate 13 of a singlebeam back-plate modulation storage cathoderay tube 22 scanned synchronously with the pulse transmission which produces an output at the collector electrode 111 equal to the difference between the signals being applied and the signals applied during the preceding recurrence period, said difference signal being then subtracted from the signal being received to give the required delayed signal. Fig. 4 (not shown) illustrates a suitable form of bridge rectifier multiplying circuit.