发明申请
- 专利标题: Item finding using RF signalling
- 专利标题(中): 使用RF信号的项目查找
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申请号: US10881020申请日: 2004-06-29
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公开(公告)号: US20050285742A1公开(公告)日: 2005-12-29
- 发明人: Hal Charych , Raj Bridgelall , Sumita Malik , Michael O'Haire
- 申请人: Hal Charych , Raj Bridgelall , Sumita Malik , Michael O'Haire
- 主分类号: G01S3/20
- IPC分类号: G01S3/20 ; G01S13/75 ; G06K17/00 ; G08B13/14
摘要:
Methods and apparatus are provided for locating one among many items equipped with RFID tags. The apparatus comprises a portable system interrogating the RFID tags and receiving responses therefrom that depend at least on their bearing angle. A comparator selects responses from the one item and ignores others. An annunciator indicates the presence of the one item in the interrogator field of view and, desirably but not essentially, its relative proximity. A directional antenna whose beam pattern is limited in azimuth and/or elevation provides bearing angle information. Its field of view becomes progressively smaller as the antenna approaches the one item so that a user can substantially pinpoint its location without needing any of the usual RFID infrastructure. Tag response hit rate and/or signal strength provides range related information to the interrogator. Optionally, the presence of each new tag is announced until all new tags have been identified.
公开/授权文献
- US07142120B2 Item finding using RF signalling 公开/授权日:2006-11-28
信息查询
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