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Method and apparatus for measuring distances, and method for determining positions

  • US 9,201,140 B2
  • Filed: 04/25/2012
  • Issued: 12/01/2015
  • Est. Priority Date: 04/29/2011
  • Status: Active Grant
First Claim
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1. A ranging method by using a first signal transmitted by a first device and a second signal generated and transmitted by a target device in response to the first signal, the method characterized in calculating a distance between the target device and a second device being in communication with the first device and the target device, by using:

  • a first time interval measured from a time point of the first device'"'"'s completing transmission of the first signal to a time point of the first device'"'"'s completing reception of a first part of the second signal, and a third time interval measured from a time point of the first device'"'"'s completing reception of the first part of the second signal to a time point of the first device'"'"'s completing reception of a second part of the second signal;

    a second time interval measured from a time point of the second device'"'"'s completing reception of the first signal to a time point of the second device'"'"'s completing reception of the first part of the second signal, and a fourth time interval measured from a time point of the second device'"'"'s completing reception of the first part of the second signal to a time point of the second device'"'"'s completing reception of the second part of the second signal;

    a given delay time interval from a time point of the target device'"'"'s completing reception of the first signal to a start time of the second signal and a given duration of each of the first and the second parts of the second signal; and

    a given distance between the first device and the second device.

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