Radio control system

• US 3,182,328 A
• Filed: 02/02/1961
• Issued: 05/04/1965
• Est. Priority Date: 02/02/1961
• Status: Expired due to Term

• Current Assignee: Donald L. Hings
• Original Assignee: Donald L. Hings
• Inventors: Hings, Donald L.
• Application Number:
  US04/086,815
• Time in Patent Office: 1,552 Days
• US Class Current: 342/33
• CPC Class Codes: G01S 13/52 Discriminating between fixed and moving objects or between objects moving at different speeds

Claims

4. AN AIRCRAFT DETECTION SYSTEM COMPRISING, IN COMBINATION, A TRANSMITTING ANTENNA AT A FIRST LOCATION, SAID TRANSMITTING ANTENNA EMITTING WAVES IN THE VHF REGION, A RECEIVING LOCATION ON THE EARTH'"'"''"'"'S SURFACE REMOTE FROM THE TRANSMITTING ANTENNA A DISTANCE SUFFICIENT SO THAT THE TRANSMITTING ANTENNA FIELD IS CONSIDERABLY ATTENUATED, A RECEIVER AT SAID RECEIVING LOCATION, FIRST AND SECOND RECEIVING ANTENNAS AT SAID RECEIVING LOCATION EACH BEING DIRECTIONAL AND BEAMED UPWARDLY TO ESTABLISH A ZONE OF DETECTION DETERMINED BY COINCIDENCE OF SID TRANSMITTING ANTENNA FIELD AND SAID TWO RECEIVING ANTENNA FIELDS, WHEREBY AIRCRAFT FLYING WITHIN SAID ZONE OF DETECTION REFLECT WAVES FROM SAID TRANSMITTING ANTENNA TO SAID FIRST AND SECOND RECEIVING ANTENNAS, AND MEANS AT SAID RECEIVER TO COMPARE THE CHANGING PHASE OF THE SIGNAL RECEIVED AT SAID FIRST AND SECOND RECEIVING ANTENNAT TO INDICATE THE PASSAGE OF ANY SAID AIRCRAFT.