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METHOD FOR DETERMINING THE DISTANCE TRAVELLED OVER BY A VEHICLE WITH RESPECT TO A REFERENCE SURFACE AND DEVICE FOR PRACTISING SAID METHOD

  • US 3,745,520 A
  • Filed: 06/15/1971
  • Issued: 07/10/1973
  • Est. Priority Date: 06/24/1970
  • Status: Expired due to Term
First Claim
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1. A device for determining the distance travelled over by a vehicle moving with respect to a reference surface comprising means for producing signals at given frequencies, means for transmitting said signals along at least one axis inclined with respect to the surface, means for receiving echos of the transmitted signals, means for demodulation of the received signals and means for counting the transmitted signals and the received signals, means for detecting the frequency of the received signals and means for memorizing the value of said frequency of the received signals and further comprising synchronization means for controlling switching means connecting said signal producing means to the transmission means successively during a first time interval and during a second time interval of a duration permanently equal to the propagation time and starting substantially at the beginning of the reception of the echos of the signals transmitted during the first time interval, switching means connecting said detection means to said reception means during a third time interval shorter than and proportional to said propagation time, and switching means connecting the memorization means to said demodulaTing means from the end of the third time interval to the end of each cycle.

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