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Multiple frequency through-the-wall motion detection and ranging using a difference-based estimation technique

  • US 20070024487A1
  • Filed: 11/02/2004
  • Published: 02/01/2007
  • Est. Priority Date: 01/20/2004
  • Status: Active Grant
First Claim
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1. A method for detecting range to a moving object, comprising the steps of:

  • projecting continuous wave energy at two different frequencies towards the moving object from an antenna; and

    , estimating range from the antenna to the moving object based on the phase difference between outgoing and reflected waves of the two frequencies at the antenna.

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