ECHO CORRELATION SYSTEM FOR SUBMARINE DETECTION USING ACTIVE SOUNDING DEVICES

摘要

A system for detecting submarine targets using active sounding equipment provides correlation between echoes received during N successive sweeps. The system includes N-1 delay devices, preferably in the form of shift registers, which are serially connected to an input terminal and which provide a delay equal to the duration of a sweep. Storage devices, which can also be shift registers, are individually connected to the outputs of respective delay devices and provide arithmetically increasing storage times. An N-input coincidence gate is connected to the outputs of the storage devices.