METHOD AND APPARATUS FOR DISTANCE MEASUREMENT

  • US 3,830,567 A
  • Filed: 03/15/1972
  • Issued: 08/20/1974
  • Est. Priority Date: 04/28/1971
  • Status: Expired due to Term
First Claim
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1. A method of computing the range of an object which reflects a pulse of energy directed towards it, comprising the steps of measuring the time interval between the moment of pulse transmission towards the object and the instant that a threshold value is attained by the rising flank of a measuring pulse, corresponding the measuring pulse tO the reflected pulse whose amplitude has been deliberately expanded or diminished to a predetermined magnitude by increasing progressively the amplitude of transmitted pulses during the course of the measurement until the amplitude of the received pulse attains the predetermined magnitude, and computing from the measured time interval the range of the object.

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