Localization Using Virtual Antenna Arrays In Modulated Backscatter RFID Systems
First Claim
1. A localization method for use in a tag communication system, comprising:
- associating a supertag having a plurality of tags with an item;
reading backscatter signals from the tags of the plurality of tags to provide a plurality of backscatter signals;
estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters; and
localizing the item in accordance with the plurality of derived signal parameters.
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Abstract
A localization method for use in a tag communication system includes associating a supertag having a plurality of tags with an item, reading backscatter signals from the tags of the plurality of tags to provide a plurality of backscatter signals, estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters, and localizing the item in accordance with the plurality of derived signal parameters. The backscatter signals are read by a tag reader having a single antenna and the item is localized in accordance with an antenna array technique performed upon the plurality of derived signal parameters. The backscatter signals are read with an antenna array to provide a further plurality of derived signal parameters for each tag of the plurality of tags, and the item is localized in accordance with the further pluralities of derived signal parameters.
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Citations
20 Claims
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1. A localization method for use in a tag communication system, comprising:
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associating a supertag having a plurality of tags with an item; reading backscatter signals from the tags of the plurality of tags to provide a plurality of backscatter signals; estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters; and localizing the item in accordance with the plurality of derived signal parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A localization method for use in a tag communication system, comprising:
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associating a tag with an item; reading a backscatter signal from the tag at a plurality of tag reader locations to provide a plurality of backscatter signals; estimating a signal parameter of the backscatter signals of the plurality of backscatter signals to provide a plurality of derived signal parameters; and localizing the item in accordance with the plurality of derived signal parameters. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification