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Pulse echo recognition systems

  • US 3,312,970 A
  • Filed: 06/27/1941
  • Issued: 04/04/1967
  • Est. Priority Date: 06/27/1941
  • Status: Expired due to Term
First Claim
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1. A PULSE ECHO RECOGNITION SYSTEM FOR AIR OR SURFACE CRAFT INCLUDING A STATION CONSISTING OF A PULSE TRANSMITTER, AND A PULSE ECHO RECEIVER, AN INDICATOR CONNECTED TO SAID RECEIVER FOR INDICATING THE DISTANCES OF PULSE REFLECTING CRAFT, MEANS LOCATED ON SAID CRAFT FOR RADIATING FROM SAID CRAFT PULSE RECOGNITION SIGNALS IN RESPONSE TO CHALLENGING SIGNALS FROM SAID STATION, MEANS LOCATED NEAR SAID STATION FOR RECEIVING SAID PULSE RECOGNITION SIGNALS, AND MEANS FOR APPLYING SAID RECOGNITION SIGNALS TO SAID INDICATOR SO THAT EACH OF SAID DISTANCE INDICATING SIGNALS MAY BE COMPARED TO EACH OF SAID INDICATED RECOGNITION SIGNALS.

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