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Method and apparatus for measuring distance using low clock rate signal

  • US 20060214840A1
  • Filed: 03/08/2006
  • Published: 09/28/2006
  • Est. Priority Date: 03/25/2005
  • Status: Active Grant
First Claim
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1. A method of measuring a distance, comprising:

  • transmitting predetermined radio waves;

    generating a first clock signal having a clock frequency b and counting N3 a number of clocks of the first clock signal;

    generating a second clock signal having a clock frequency a and delaying the second clock signal until the transmitted radio waves are received to generate a delayed second clock signal;

    counting N1 a number of clocks of the delayed second clock signal having the clock frequency a; and

    measuring the distance using the count values N1, N3 of the clock signals having the clock frequencies a and b.

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