Sequential matched filter

• US 3,167,738 A
• Filed: 05/22/1962
• Issued: 01/26/1965
• Est. Priority Date: 05/22/1962
• Status: Expired due to Term

• Current Assignee: Everett C. Westerfield
• Original Assignee: Everett C. Westerfield
• Inventors: Westerfield, Everett C.
• Application Number:
  US04/197,564
• Time in Patent Office: 980 Days
• US Class Current: 367/90
• CPC Class Codes: G01S 13/30 using more than one pulse per radar period
• CPC Class Codes: G01S 13/325 using transmission of coded signals, e.g. P.S.K. signals
• CPC Class Codes: G01S 7/292 Extracting wanted echo-signals
• CPC Class Codes: Y10S 367/901 Noise or unwanted signal reduction in nonseismic receiving system

Claims

1. A SEQUENTIAL MATCHED FILTER COMPRISING IN COMBINATION, A MASTER PULSE GENERATOR, A PULSE FREQUENCY DIVIDER COUPLED TO THE OUTPUT OF SAID MASTER PULSE GENERATOR, A BINARY FLIP-FLOP ADAPTED FOR RECEIVING AND CONVERTING A VARYING AMPLITUDE ENCODED INTELLIGENCE SIGNAL INTO A TWOLEVEL BINARY SIGNAL, A SAMPLER AND GATE CONNECTED TO THE OUTPUTS OF SAID BINARY FLIP-FLOP AND SAID PULSE FREQUENCY DIVIDER, A SHIFT REGISTER HAVING A PLURALITY OF STAGES WITH A PREDETERMINED BINARY PROGRAM STORED THEREON, SAID SHIFT REGISTER BEING CONNECTED TO SAID PULSE FREQUENCY DIVIDER FOR BEING SHIFTED BY THE OUTPUT PULSES THEREFROM AND TO THE OUTPUT OF SAID SAMPLER AND GATE FOR RECEIVING THE SMAPLE OF THE ENCODED INTELLIGENCE SIGNAL TO BE SHIFTED THERETHROUGH, AND MEANS CONNECTED TO THE OUTPUTS OF SAID MASTER PULSE GENERATOR AND SAID PULSE FREQUECNY DIVIDER AND TO SAID SHIFT REGISTER FOR SEQUENTIALLY SCANNING THE OUTPUTS THEREOF AND CONVERTING SAME INTO A SINGLE ANALOG SIGNAL.

5. AN ECHO-RANGING SYSTEM COMPRISING IN COMBINATION, MEANS FOR BROADCASTING A PROGRAMMED TARGER SEARCH SIGNAL, MEANS ASSOCIATED WITH SAID BROADCASTING MEANS FOR RECEIVING AND ECHO OF SAID SEARCH SIGNAL AFTER IT HAS BEEN REFLECTED BY A TARGET, MEANS CONNECTED TO SAID RECEIVING MEANS FOR STATISTICALLY SAMPLING SAID RECEIVED ECHO SIGNAL, SYNCHRONIZING MEANS CONNECTED TO SAID SAMPLING MEANS AND THE AFORESAID BROADCASTING MEANS FOR SYNCHRONOUSLY ACTUATING EACH, A SEQUENTIAL MATCHED FILTER CONNECTED TO AN OUTPUT OF SAID SAMPLING MEANS AND SAID SYNCHRONIZING MEANS FOR PRODUCING AN ANALOG SIGNAL PROPORTIONAL TO DEGREE OF MATCH BETWEEN SAID ECHO SIGNAL SAMPLES AND THE PROGRAM OF SAID PROGRAMMED TARGET SEARCH SIGNAL AT ANY GIVEN INSTANT.