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Localizing tagged assets using modulated backscatter

  • US 9,262,912 B2
  • Filed: 02/25/2008
  • Issued: 02/16/2016
  • Est. Priority Date: 02/25/2008
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • scanning, from a reader having one or more antennas, an electromagnetic signal across a zone, the zone formed between a plurality of marker tags located in an area proximate to the reader;

    affixing an asset tag to an asset; and

    determining a location estimate of the asset tag based on parameters of backscatter signals, the backscatter signals received by the reader from the asset tag and the plurality of marker tags;

    wherein the location estimate includes a determination of whether the asset tag is positioned within the zone formed by the plurality of marker tags;

    and wherein the parameters of the backscatter signals include an angle of arrival, a range from the reader to at least one of the plurality of marker tags, and a range from the reader to the asset tag;

    wherein the angle of arrival of the backscatter signals is determined based on a peak received signal strength of the backscatter signals as a function of a scan angle of the scanned electromagnetic signal; and

    wherein the range from the reader to the at least one of the plurality of marker tags and the range from the reader to the asset tag are determined based on comparing shapes of vectors of received powers with vectors of expected powers.

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