Identification System
First Claim
Patent Images
1. :
- A method relating to identification systems in which a transponder reflects an inquiry signal from a communicator, said method comprising the steps of;
modulating a reflected signal from the transponder with data that can be read by the communicator, including in said modulated data-carrying signal reflected by the transponder a check sum calculated on the basis of data stored in a memory of the transponder, and permanently storing the check sum in the transponder memory.
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Abstract
A method and apparatus pertaining to identification systems in which a transponder reflects an inquiry signal from a communicator. The reflected signal is modulated with data that can be read by the communicator, and the data-carrying modulation includes a check sum calculated on the basis of data stored in the transponder memory. The transponder check sum is stored permanently in the transponder memory. A calculated check sum is calculated in the communicator based upon the transponder data included in the reflected inquiry signal, and the calculated check sum is compared with the check sum stored in the transponder to determine whether the transponder identifies an authorized person or object that is to be identified.
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Citations
7 Claims
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1. :
- A method relating to identification systems in which a transponder reflects an inquiry signal from a communicator, said method comprising the steps of;
modulating a reflected signal from the transponder with data that can be read by the communicator, including in said modulated data-carrying signal reflected by the transponder a check sum calculated on the basis of data stored in a memory of the transponder, and permanently storing the check sum in the transponder memory. - View Dependent Claims (2, 3, 4, 5)
- A method relating to identification systems in which a transponder reflects an inquiry signal from a communicator, said method comprising the steps of;
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6. :
- A transponder comprising;
at least one antenna, at least one memory, and at least one means for reflecting and modulating an inquiry signal received from a communicator, wherein said reflected signal includes a data-carrying modulation, wherein the reflected signal is read by the communicator, and wherein said data-carrying modulation includes a check sum calculated on the basis of data stored in the transponder memory, wherein the transponder includes a check sum stored permanently in the transponder memory. - View Dependent Claims (7)
- A transponder comprising;
Specification