A digital sliding correlator having means for producing a series of time-shifted stored copies of a digital character, means responsive to said shifted, stored copies of the character for multiplying said shifted, stored copies by the input signal or the sign-inverted counterpart of the input signal,...http://www.google.fr/patents/US5523758?utm_source=gb-gplus-shareBrevet US5523758 - Sliding correlator for nanosecond pulses
