Range reply search apparatus

摘要

Apparatus for searching for range indicating pulse signals received as part of distance measuring equipment which first form a list of distance indications in a first search time. The distance indications obtained in a second search time are then logically combined with those indications in the first list and any combination that results in a difference value of less than a prescribed amount is retained for list updating purposes until there is only a single distance indication left in the list. The apparatus can then change to a track mode by placing a search window around the single distance indication thereby reducing the amount of extraneous information to be manipulated by the receiving apparatus.