Identification and recognition system

• US 3,296,615 A
• Filed: 01/19/1942
• Issued: 01/03/1967
• Est. Priority Date: 01/19/1942
• Status: Expired due to Term

• Current Assignee: Philpott La Verne R, Robert M. Page
• Original Assignee: Philpott La Verne R, Robert M. Page
• Inventors: Page, Robert M., PHILPOTT LA VERNE R
• Application Number:
  US02/427,240
• Time in Patent Office: 9,115 Days
• US Class Current: 342/45
• CPC Class Codes: G01S 13/78 discriminating between different kinds of targets, e.g. IFF-radar, i.e. identification of friend or foe G01S13/75, G01S13/79 take precedence

Claims

1. A SYSTEM FOR DETERMINING WHETHER REMOTE CRAFT ARE OPERATED BY FRIENDLY OR UNFRIENDLY FORCES COMPRISING:

A FIRST RADIO TRANSMITTER LOCATED AT A REFERENCE STATION;

KEYER MEANS FOR CONTROLLING THE RATE OF PULSE TRANSMISSION BY SAID FIRST RADIO TRANSMITTER;

A FIRST RECEIVER POSITIONED ON FRIENDLY CRAFT FOR RECEIVING THE PULSES TRANSMITTED BY SAID FIRST RADIO TRANSMITTER;

A SECOND RADIO TRANSMITTER POSITIONED ON FRIENDLY CRAFT;

A KEYER POSITIONED ON FRIENDLY CRAFT FOR CONTROLLING THE RATE OF TRANSMISSION OF PULSES BY SAID SECOND RADIO TRANSMITTER IN RESPONSE TO THE OUTPUT OF SAID FIRST RECEIVER;

CODER MEANS POSITIONED ON FRIENDLY CRAFT FOR IMPRESSING A PREDETERMINED CODE ON THE PULSES EMITTED FROM SAID SECOND RADIO TRANSMITTER AND MEANS LOCATED AT SAID REFERENCE STATION AND INCLUDING A SECOND RECEIVER FOR DERIVING FROM THE RECEPTION OF THE PULSES EMITTED FROM SAID SECOND TRANSMITTER AN INDICATION OF THE RANGE OF SAID CRAFT FROM SAID STATION, SAID INDICATION FURTHER DISPLAYING SAID CODE.