JPH06232781A - Data carrier system - Google Patents

Abstract

PURPOSE:To attain individual read/write from/to plural responders in existence in a communication available area by providing the responder comprising a storage element storing identification data corresponding to a specific frequency to a control means. CONSTITUTION:A specific frequency depending on each responder is allocated in advance to an oscillator 13 and identification data corresponding to the specific frequency are stored in a storage element 10. On the other hand, the specific frequency and the identification data are set in advance to a controller 1 or the like of an interrogator. The interrogator modulates the identification data set in the controller 1 or the like at data read and sends the modulated signal as a transmission signal 100a. Each responder demodulates the signal from the interrogator and modulates transmission data in the element 10 only when own identification data are in existence in received data and sends the modulated data as a transmission signal 101a. The responder demodulates the transmission signal 100a similarly at data write and stores the data to the element only when own identification data are in existence.

Description

Detailed Description of the Invention

[0001]

This invention relates to FA (Factory Automa
Option: hereinafter referred to as FA), data carrier systems used in the fields of physical distribution, security, etc.
The present invention relates to a data carrier system capable of simultaneously detecting individual transponders (data carriers) existing within a communication area of one transponder.

[0002]

2. Description of the Related Art In the field of FA and the like, by mounting a transponder on the moving body and reading and writing information data and the like stored in the transponder by an interrogator provided on a fixed side. , Identification and management of moving objects such as goods. FIG. 2 is a block diagram showing an example of such a conventional data carrier system.

In FIG. 2, 1 is a controller, 2 and 9
Is a signal processor, 3 and 11 is a modulator, 4 and 8 is a demodulator, 5 is an oscillator, 6 and 7 are antennas, 10 is a storage element, and 100 and 101 are transmission signals. Here, 1 and 2 are control means 50, 3 to 6 are transmitting / receiving means 51, 7,
Reference numerals 8 and 11 constitute a transmitting / receiving means 52, and 9 and 10 constitute a control means 53, respectively. Further, the control means 50 and the transmission / reception means 51 are interrogators, and the control means 52 and the transmission / reception means 5
Reference numerals 3 respectively constitute transponders.

In the interrogator, the output of the controller 1 is connected to the signal processor 2, and the output of the signal processor 2 and the output of the oscillator 5 are connected to the modulator 3. The output of the modulator 3 is connected to the antenna 6 and the transmission signal 100 is transmitted from the antenna 6.
Sent as. In addition, the transmission signal 101 from the transponder
Is received by the antenna 6, and the received signal, which is the output from the antenna 6, is connected to the demodulator 4. Further, the output of the demodulator 4 is connected to the signal processor 2 and processed by the controller 1 and the like.

In the responder, the transmission signal 1 from the interrogator
00 is received by the antenna 7, and the output of the antenna 7, which is the received signal, is connected to the demodulator 8. The output of the demodulator 8 is connected to the signal processor 9. In addition, the signal processor 9
Is connected to the storage element 10, and the output of the signal processor 9 is connected to the modulator 11. Further, the output of the modulator 11 is connected to the antenna 7 and is transmitted as the transmission signal 101 from the antenna 7.

The operation of the conventional example shown in FIG. 2 will be described. When reading data, the interrogator transmits a non-modulated signal as a transmission signal 100 by the controller 1, the signal processor 2, the modulator 3 and the antenna 6. Therefore, the modulator 3 does not operate when reading data.

The transponder detects the transmission signal 100 from the interrogator by means of the antenna 7, and under the control of the signal processor 9, the data to be transmitted in the storage element 10 is transmitted by the modulator 11 to the BPS.
The signal is modulated by K (Binary Phase Shift Keying) or the like and transmitted as a transmission signal 101 from the antenna 7.

The interrogator transmits the transmission signal 101 from the responder to the antenna 6, demodulator 4, signal processor 2 and controller 1.
To demodulate and obtain data.

On the other hand, at the time of writing data, the interrogator sends the data to be written by the controller 1, the signal processor 2, the modulator 3 and the antenna 6 to the ASK (Amplitude Shift).
Keying) and the like are modulated and transmitted as a transmission signal 100.

The responder demodulates the transmission signal 100 from the interrogator by the antenna 7, demodulator 8 and signal processor 9,
The obtained data is stored in the storage element 10.

[0011]

However, in the conventional example shown in FIG. 2, when a plurality of transponders exist within the communication area of one transponder, data is transmitted simultaneously from the plurality of transponders when reading data. As a result, the interrogator cannot read the data due to interference. On the other hand, when writing data, the same data is written in a plurality of transponders, and the written data cannot be confirmed because the data cannot be read as described above.

As a result, there has been a problem in the prior art that only one transponder is provided within the communicable area of one transponder. Therefore, it is an object of the present invention to realize a data carrier system in which a plurality of transponders existing within the communication area of one transponder can be individually read and written.

[0013]

In order to achieve such an object, according to the first aspect of the present invention, an interrogator transmits and receives data to and from a transponder provided in the mobile body to read and write data from the mobile body. In the data carrier system for identifying the above, the transmitting / receiving means for transmitting / receiving to / from the interrogator, the control means for controlling the transmitting / receiving means, and the oscillator provided in the transmitting / receiving means and having the natural frequency for each responder The transponder is provided in the control means and includes a storage element in which identification data corresponding to the natural frequency is stored.

According to a second aspect of the present invention, in the data carrier system in which the interrogator identifies the mobile unit by reading and writing data in the transponder provided in the mobile unit by transmission and reception, transmission and reception with the transponder. And a control means for controlling the transmission / reception means, which stores identification data corresponding to a preset natural frequency in the responder, and a frequency provided in the control means for identifying the natural frequency. The interrogator comprises an analyzer and the interrogator.

[0015]

The interrogator and the plurality of transponders share the information of the natural frequency pre-assigned to the oscillator for each of the plurality of transponders and the information of the identification data corresponding to the natural frequency. Can be identified.

[0016]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a configuration block diagram showing an embodiment of a data carrier system according to the present invention. Where 1 to 11 and 5
Reference numerals 1 and 53 are the same as those in FIG. In FIG. 1, 12 is a frequency analyzer, 13 is an oscillator having a unique frequency, and 100a and 101a are transmission signals. Also,
1, 2, and 12 constitute a control means 50a, and 7, 8, 11, and 13 constitute a transmission / reception means 52a. Further, the control means 50a and the transmission / reception means 51 are interrogators,
The control means 52a and the transmission / reception means 53 respectively constitute transponders.

The connection relationship is almost the same as the conventional example shown in FIG. 2, except that the frequency analyzer 12 is connected to the signal processor 2 and the demodulator 4, and the oscillator 13 is connected to the modulator 11.
Is the point connected to.

The operation of the embodiment shown in FIG. 1 will be described. In FIG. 1, the oscillator 13 is assigned a natural frequency in advance for each transponder, and the storage element 10 stores identification data corresponding to the natural frequency. On the other hand, in the interrogator, the natural frequency and the identification data are the controller 1
Is set in advance.

At the time of identifying the transponder, the interrogator transmits a non-modulated signal as the transmission signal 100a by the controller 1, the signal processor 2, the modulator 3 and the antenna 6 as in the conventional case. At this time, each transponder transmits the transmission signal 1 from the interrogator.
00a is detected by the antenna 7, and the signal processor 9 and the modulator 1
1 and the oscillator 13 modulate using the natural frequency output of the oscillator 13. This modulated signal is transmitted from the antenna 7 as a transmission signal 101a.

The interrogator demodulates the transmission signal 101a from the responder by the antenna 6, demodulator 4, signal processor 2 and controller 1. At this time, the frequency analyzer 12 analyzes the frequency component of the demodulated signal and outputs the result to the signal processor 2
Output to. Further, the signal processor 2 or the controller 1 identifies each transponder existing within the communicable area of the transponder based on the frequency component analysis result.

At the time of data reading, the interrogator modulates the identification data preset in the controller 1 and the like by the controller 1, the signal processor 2, the modulator 3 and the antenna 6, and transmits it as the transmission signal 100a. Each transponder demodulates the transmission signal 100a from the interrogator by the antenna 7, the demodulator 8 and the signal processor 9, and the transponder is stored in the storage element 10 only when the received data has its own identification data. Data to be transmitted is signal processor 9, modulator 1
1 and the oscillator 13 modulate and transmit from the antenna 7 as the transmission signal 101a.

At the time of writing data, the interrogator modulates the identification data and the writing data preset in the controller 1 and the like by the controller 1, the signal processor 2, the modulator 3 and the antenna 6, and transmits them as the transmission signal 100a. . Each responder is a transmission signal 100a from the interrogator.
Is demodulated by the antenna 7, the demodulator 8 and the signal processor 9, and the responder stores the obtained data in the storage element 10 only when the received data has its own identification data.

As a result, the interrogator and the transponder share the information of the natural frequency pre-assigned to the oscillator 13 of each transponder and the identification data corresponding to this natural frequency. It becomes possible to selectively perform read and write processing with respect to.

Instead of assigning the natural frequency and the identification data to each responder, it is possible to divide a plurality of responders into groups and assign the unique frequency and the identification data to this group. . Further, the natural frequency may be assigned to include a plurality of frequencies instead of a single frequency. Further, regarding the frequency analyzer 12, the FFT
In addition to using the one that can detect the frequency having a plurality of peak components by the analysis method, it is also possible to configure with a plurality of bandpass filters.

As is apparent from the above description,
The present invention has the following effects. Since the interrogator and the transponder share the information of the natural frequency pre-assigned to the oscillator of each transponder and the identification data corresponding to the natural frequency, a plurality of transponders existing in the communicable area of one transponder are shared. It is possible to realize a data carrier system capable of individually reading and writing to the transponder.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of a data carrier system according to the present invention.

FIG. 2 is a configuration block diagram showing an example of a conventional data carrier system.

[Explanation of symbols]

 1 controller 2,9 signal processor 3,11 modulator 4,8 demodulator 5 oscillator 6,7 antenna 10 storage element 12 frequency analyzer 13 oscillator 50, 50a, 53, 53a control means 51, 51a, 52, 52a transmission / reception Means 100, 100a, 101, 101a Transmission signal

Claims (2)

[Claims] 1. A data carrier system in which an interrogator identifies the mobile object by reading and writing data in a responder provided in the mobile object by transmitting and receiving, and a transmitting and receiving means for transmitting and receiving to and from the interrogator. A control means for controlling the transmitting / receiving means, an oscillator provided in the transmitting / receiving means and having a natural frequency for each responder, and a memory provided in the control means and storing identification data corresponding to the natural frequency A data carrier system comprising the transponder composed of an element. 2. A data carrier system in which an interrogator identifies a moving body by reading and writing data in a responder provided in the moving body by transmitting and receiving, and a transmitting and receiving means for transmitting and receiving with the responder. A control means for controlling the transmission / reception means and storing identification data corresponding to a preset natural frequency in the responder; and a frequency analyzer provided in the control means for identifying the natural frequency. A data carrier system comprising the interrogator described above.