Speed measuring system

• US 3,147,477 A
• Filed: 12/26/1957
• Issued: 09/01/1964
• Est. Priority Date: 12/26/1957
• Status: Expired due to Term

• Current Assignee: Frank R. Dickey Jr
• Original Assignee: Frank R. Dickey Jr
• Inventors: Dickey, Frank R. Jr.
• Application Number:
  US03/705,419
• Time in Patent Office: 2,441 Days
• US Class Current: 342/105
• CPC Class Codes: G01S 13/60 wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track G01S13/64 takes precedence
• CPC Class Codes: G01S 13/605 using a pattern, backscattered from the ground, to determine speed or drift by measuring the time required to cover a fixed distance
• CPC Class Codes: G01S 15/60 wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track

Claims

5. IN A SYSTEM FOR MEASURING THE SPEED OF MOTION OF A BODY IN A GIVEN HORIZONTAL DIRECTION, THE COMBINATION COMPRISING A SOURCE OF SINGLE-FREQUENCY CONSTANT-AMPLITUDE WAVE ENERGY ASSOCIATED WITH SAID BODY AND PROJECTING WAVE ENERGY DOWNWARDLY OVER A RELATIVELY BROAD BEAM, A PAIR OF RECEIVING ANTENNAS ASSOCIATED WITH SAID BODY AND DOWNWARDLY DIRECTED FOR RECEIVING CORRESPONDING ECHOES OF THE WAVE ENERGY PROJECTED BY SAID SOURCE, SAID RECEIVING ANTENNAS HAVING A KNOWN MUTUAL SEPARATION MEASURED IN SAID HORIZONTAL DIRECTION, A PAIR OF DETECTORS COUPLED TO SAID RESPECTIVE RECEIVING ANTENNAS FOR SENSING MODIFICATION OF SAID PROJECTED WAVE ENERGY IN THE ECHO PROCESS, TIME DELAY MEANS COUPLED TO AT LEAST ONE OF SAID DETECTORS FOR PROVIDING A KNOWN TIME DELAY TO ONE DETECTED ECHO RETURN RELATIVE TO THE OTHER, CORRESPONDENCE SENSING MEANS HAVING SUPPLIED THERETO SAID RELATIVELY DELAYED DETECTED ECHO RETURNS, MEANS FOR ADJUSTING THE AMOUNT OF SAID SEPARATION TO BRING ABOUT CORRESPONDENCE, AND MEANS DEPENDENT UPON THE QUOTIENT OF SAID SEPARATION AND SAID TIME DELAY FOR DETERMINING SAID SPEED.