Radar clutter video processing system

Claim 1

IN A RADAR SYSTEM, WHEREIN SERIES OF SUCCESSIVE BINARY SIGNALS ARE PROVIDED BY A DIGITIZED RECEIVER, A CLUTTER DETECTION SYSTEM FOR DETECTING THE PRESENCE OF CLUTTER SIGNALS IN ANY OF A PLURALITY OF RANGE INTERVALS COMPRISING: FIRST MEANS FOR SEQUENTIALLY STORING THE BINARY SIGNALS REPRESENTING HITS OR MISSES FROM SUCCESSIVE RANGE INTERVALS FROM AT LEAST A PORTION OF A SINGLE RADAR SWEEP; A MEMORY INCLUDING MEANS FOR STORING MULTIBIT MEMORY WORDS EACH WORD BEING ASSOCIATED WITH ANOTHER OF SAID RANGE INTERVALS AND MEANS FOR READING OUT AND WRITING IN BINARY SIGNALS IN THE BITS IN EACH WORDS; SECOND MEANS RESPONSIVE TO THE SIGNALS STORED IN SAID FIRST MEANS FOR DEVELOPING HIT PATTERN-REPRESENTING SIGNALS EACH SIGNAL BEING INDICATIVE OF A HIT PATTERN OF HITS IN RELATED RANGE INTERVALS; AND WRITE CONTROL LOGIC MEANS RESPONSIVE TO SAID HIT PATTERNREPRESENTING SIGNALS AND A SELECTED NUMBER OF BITS OF A MEMORY WORD FOR STORING IN SAID SELECTED NUMBER OF BITS BINARY SIGNALS INDICATIV OF THE HISTORY OF THE HIT PATTERNS RELATED TO THE RANGE INTERVAL ASSOCIATED WITH SAID WORD IN A SEQUENCE OF RADAR SWEEPS, SAID LATTER MEANS FURTHER INCLUDING MEANS FOR SETTING ONE BIT OF SAID SELECTED NUMBER OF BITS TO A FIRST BINARY STATE TO INDICATE THE PRESENCE OF CLUTTER IN SIAD RANGE INTERVAL WHEN THE OTHER OF SAID SELECTED BITS REACH A PREDETERMINED STATE.