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Astra Gesellschaft Für Asset Management Mbh&co. Kg

Holger Merk

Anatoli Stobbe

Andreas Werner

A method is described for locating a detection microchip that transmits a detection signal, which is received and evaluated by a reader. The current distance between the reader and the detection microchip is determined from a run-time dependent feature of the received detection signal and the propagation speed of electromagnetic waves.

Method for locating a detection microchip

A system is described for the spatial allocation of at least one transponder to cells of a detection area. The cells of the detection area differ by changeable or permanently different properties of an electromagnetic field. By means of the transponder, the properties of the electromagnetic fields of the cells which are capable of reception individually, selectively, or resultantly, are evaluated. Allocation to the cells is effected automatically according to the properties of the individual electromagnetic fields received, or according to the ratio of the proportions of the electromagnetic fields received selectively or resultantly, or according to the proportion predominating in the field strength of the electromagnetic fields received selectively or resultantly.

System for the spatial allocation of at least one transponder to the cells of a detection area, base station, and transponder

A process and configuration used therein for detecting a transponder in a detection region, structured into two adjacent overlapped cells, provide for detecting the transponder with reference to a particular one cell of the two cells. The detecting process includes the steps of: providing in each of the cells a field with a detectable field characteristic; acquiring the field characteristic of a first of the cells using a sensing unit of the transponder; cyclically transmitting a response signal from a transmitting unit of the transponder containing the acquired field characteristics; receiving the response signal by a receiver which contains response signal information regarding the acquired field characteristic, namely that of the field of the first cell, that of the field of the adjacent cell or an unknown field characteristic; evaluating the response signal with respect to the information of the acquired field characteristic contained in the receiver; comparing the acquired field characteristic with the field characteristics provided in the cells; determining the possible position(s) of the transponder on the basis of the results of the performed comparison; and verifying a position determination, wherein, after detection of a transponder in the first cell, the field characteristic of the adjacent cell is adjusted such that it differs from that of the first cell.

Process and configuration for detecting a transponder with reference to a particular cell of two adjacent overlapped cells

In a method for automatically identifying an unknown number of transponders, these transponders are put into a dead state by a collision signal transmitted by the reader. Then, each transponder generates its own random dead time and the transponder with the shortest dead time is the first to transmit its data to the reader, while the other transponders are put into an idle state. When the reader has completely received the data of the first transponder, the idle states of the other transponders end and they generate another dead time for themselves. The entire process is then repeated, i.e., the transponder with the shortest dead time transmits its data to the reader, etc. until all transponders have transmitted their data to the reader individually and successively.

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Barsinghausen, Germany

Holger Merk