An RSFQ implementation of a 1-bit all-digital ultra-wide-band autocorrelator with double oversampling has been developed. It uses asynchronous architecture, employing dual-rail logic for global data propagation and ``traditional'' RSFQ logic for local computation. All major blocks of the autocorrelator have been built and successfully tested at low integration levels. Further development of the design will be focused on reducing the Josephson junction count per stage and achieving higher levels of integration.