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Automatic identification system for objects or persons by remote interrogation
| Details |
Inventors: Jeuch, Pierre; Le Roy, Alain;
Assignee: Commissariat a l'Energie Atomique (Paris, FR)
Primary Examiner: Swarthout; Brent A.
Assistant Examiner: Mullen, Jr.; Thomas J.
Attorney, Agent or Firm: Pearne, Gordon, McCoy & Granger
Automatic identification system for objects or persons by remote interrogation. The invention relates to an interrogating E/R (emitter/receiver) or gate associated with an answering E/R or tag having a digitized code identifying the same. The gate supplies four information types in the form of signals to the tags which answer "yes" or, by an absence of any answer, "no" until the gate has found their codes. When its code has been found, the tag is inhibited, thus permitting the detection of other codes. The invention more particularly applies to the monitoring of persons carrying answering E/Rs or to the billing of goods on sale in a large surface area. |
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DETAILED DESCRIPTION The object of the invention is to make it possible to detect and recognize in a quasi-simultaneous manner all the objects or persons in a group by simultaneously interrogating them and thus making it possible to process a large number of objects.
The invention consists of the emission of RF signals by a gate, said RF signals being questions to which the tags reply by a consent signal or by the absence of a signal, thus enabling the gate to determine the elements of codes contained in said group of objects.
When a code has been found, the tag containing said code is inhibited in order to permit the detection of other codes.
Use will be made throughout the description and interchangeably of the terms tag, badge or answering E/R (emitter/receiver) means, as well as the terms gate or interrogating E/R (emitter/receiver) means.
In addition, throughout the description, the term "inhibit" will be understood to mean the passage into a silent or inactive mode, i.
e.
where a tag or answering means no longer reacts.
The invention more specifically relates to an automatic identification system for objects or persons by remote interrogation comprising: interrogating E/R (emitter/receiver) means incorporating a device for emitting RF (radio frequency) signals having a modulator generating different wave shapes and a RF (radio frequency) signal reception device and answering E/R means having a circuit for receiving coded information coming from the interrogating E/R means and the emission of an answer, a supply device and storage means in which is stored a digitized code linked with each object or person, characterized in that: said answering E/R means has at least one emitting/receiving antenna forming part of said reception and emission circuit, a checking and sequencing circuit controlling all the signals necessary for a complete code search sequence and inhibiting means connected to said checking and sequencing circuit and able to inhibit the answering E/R means, and said interrogating E/R means being able to continuously emit a high frequency signal, control by processing means the tasks necessary for the search of the digitized codes delivered by the answering E/R means and store in a memory said digitized codes
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Communications 
