JP2004159249A - Communication method in transponder and transponder for performing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable an interrogator to receive data of a response wave returned from a responder at the same time with writing data of a writing wave to the responder regarding a communication method in a transponder. <P>SOLUTION: This transponder is provided with the interrogator Q which has a transmitting function for transmitting the writing wave S<SB>1</SB>and an interrogation wave S<SB>2</SB>and a receiving function for receiving the returned response wave S<SB>3</SB>, and with the responder R which receives the writing wave S<SB>1</SB>transmitted from the interrogator Q to write data, receives the interrogation wave S<SB>2</SB>to read response data and to apply diffusion modulation and returns the resultant response data as the response wave S<SB>3</SB>to the interrogator Q. In the transponder, the transmitting function of the interrogator Q simultaneously transmits the writing wave S<SB>1</SB>and the interrogation wave S<SB>2</SB>subjected to the same modulation to the responder R, and a means for negating modulation components of the transmitted interrogation wave S<SB>2</SB>about data of the response wave S<SB>3</SB>received by the interrogator Q is provided between the transmitting function side and the receiving function side of the interrogator Q. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a transponder that performs bidirectional communication using microwaves between an interrogator and a transponder, and more particularly, to write a write wave data to the transponder, and at the same time, return the transponder from the transponder. The present invention relates to a communication method in a transponder which enables an interrogator to receive response wave data, and a transponder for implementing the method.
[0002]
[Prior art]
2. Description of the Related Art In recent years, transponders that perform two-way communication using microwaves have been developed as devices that collect train information such as train position information and train numbers in order to ensure the safety of train operation. Transponder this type of conventional, as shown in FIG. 2, the interrogator Q as interrogator to receive the response wave S ₃ transmits the Shokomiha S ₁ and interrogating wave S _2, it is transmitted from the interrogator Q and a responder R as a response unit for replying to the interrogator Q as a response wave S ₃ spread modulated receive that write wave S ₁ reads the received response data to the interrogating wave S ₂ writes the data Made up of
[0003]
The interrogator Q includes a control unit 1, a modulation unit 2, a transmission antenna 3, a reception antenna 4, a demodulation unit 5, and a correlator 6, and an external device 7 is connected to the control unit 1. Have been. Further, the responder R includes a first reception antenna 8, a demodulation unit 9, a data processing unit 10, a spread modulation unit 11, a modulation unit 12, a second reception antenna 13, and a transmission antenna 14. The data processing unit 10 is connected to another external device 15. Then, data such as train information is written from the interrogator Q to the responder R, and the interrogator Q reads the data of the responder R.
[0004]
First, in writing data to the responder R, the interrogator Q receives the transmission data D ₁ from the external device 7, converts the transmission data D ₁ into data of TTL level by the control unit 1 to obtain write data, and modulated by the modulator 2, for example, 2.45GHz carrier, transmitted from the transmission antenna 3 as Shokomiha _{S 1.} The responder R receives the write wave S ₁ from the interrogator Q by the first receiving antenna 8, demodulates the write wave S ₁ by the demodulation unit 9, and writes the write data to the data processing unit 10. Thereafter, the data written in the data processing unit 10 is sent to another external device 15.
[0005]
Next, in reading the response data of the responder R, the interrogator Q receives the transmission data D ₁ from the external device 7, converts the transmission data D ₁ into TTL level data in the control unit 1, and does not perform modulation in the modulation unit 2. to send as a question wave _{S 2} from the transmission antenna 3, for example, 2.45GHz of the carrier signal. At this time, in the responder R, the internal data of the data processing unit 10 is read, spread-modulated by the spread modulation unit 11, and the spread-modulated data is interrogated by the modulation unit 12 and received by the second reception antenna 13. modulated with a carrier signal S _2, and returns as a response wave _{S 3} from the transmitting antenna 14.
[0006]
Response wave S ₃ returned from the transmitting antenna 14 is received by the receiving antenna 4 of the interrogator Q, spread modulation data detected by the demodulator 5 is outputted, is correlated in the correlator 6, controls the correlation values Output to unit 1. The control unit 1 determines "1" or "0" from the input correlation value and reproduces the data. Thereafter, the control unit 1 has been adapted to output to an external device 7 to the playback data as received data D _2.
[0007]
[Problems to be solved by the invention]
However, in such a conventional transponder, when sending the write data from the interrogator Q to the responder R sends Shokomiha S ₁ modulated by the interrogator Q inside the modulator 2, from the responder R to request the response data is transmitted to the interrogating wave S ₂ in a state where no modulation in the interrogator Q inside the modulator 2, by switching the two waves with Shokomiha S ₁ and the interrogator wave S ₂ transmitted Therefore, writing data from the interrogator Q to the responder R and reading response data from the responder R cannot be performed at the same time. Therefore, real-time two-way communication between the interrogator Q and the responder R may not be possible. For this reason, communication between the interrogator Q and the responder R takes a long time, and in some cases, for example, a train detection system or the like cannot detect the passage of a train in a predetermined short time.
[0008]
Accordingly, the present invention addresses such a problem, and enables the interrogator to receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder. An object of the present invention is to provide a communication method in a transponder and a transponder implementing the method.
[0009]
[Means for Solving the Problems]
To achieve the above object, a communication method in a transponder according to the present invention has an interrogator having a transmission function of transmitting a write wave and an interrogation wave and having a reception function of receiving a returned response wave, and the interrogator. A transponder comprising: a transponder that receives a write wave transmitted from and writes data, receives an interrogation wave, reads out response data, spread-modulates the response wave, and returns it as a response wave to the interrogator. A write wave and an interrogation wave having the same modulation applied to the transponder are simultaneously transmitted from the transponder to the transponder, and at the same time as writing the write wave data to the transponder, the response wave data returned from the transponder is interrogated. Is received by the device.
[0010]
With such a configuration, the interrogator simultaneously transmits the write wave and the interrogation wave to which the same modulation is applied to the transponder, and simultaneously writes the write wave data into the transponder and returns the same from the transponder. The interrogator receives response wave data. This makes it possible for the interrogator to receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder.
[0011]
The interrogator modulates the response wave data received by the interrogator to cancel the modulated component of the interrogation wave transmitted by the interrogator. Thereby, the data of the response wave is correctly reproduced.
[0012]
Also, the transponder according to the present invention has an interrogator having a transmitting function of transmitting a write wave and an interrogation wave and having a receiving function of receiving a returned response wave, and receiving a write wave transmitted from the interrogator. And a transponder that receives the interrogation wave, reads the response data, spreads out the response data, and returns the interrogator as a response wave to the interrogator, and the transmission function of the interrogator has the same modulation. The applied write wave and interrogation wave are transmitted to the transponder at the same time, and the interrogation transmitted between the transmission function side and the reception function side of the interrogator with respect to the response wave data received by the interrogator is transmitted. It is provided with means for canceling the wave modulation component.
[0013]
With such a configuration, the transmission function of the interrogator simultaneously transmits the write wave and the interrogation wave to which the same modulation is applied to the transponder, and prepares between the transmission function side and the reception function side of the interrogator. The modulated interrogator of the interrogator cancels the modulated component of the transmitted interrogation wave with respect to the response wave data received by the interrogator. This makes it possible for the interrogator to receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder.
[0014]
The modulation component canceling means includes a distribution circuit provided on the transmission function side for distributing the same modulated write wave and interrogation wave to the reception function side, and a distribution circuit provided on the reception function side. And a mixing circuit for taking in the write wave and the interrogation wave. Thereby, the write wave and the interrogation wave to which the same modulation is applied are distributed to the reception function side by the distribution circuit on the transmission function side, and the distributed write wave and the interrogation wave are distributed by the mixing circuit to the reception function side. To cancel the modulation component of the interrogation wave.
[0015]
Further, the mixing circuit mixes and detects the response wave returned from the transponder with the modulated interrogation wave. As a result, the interrogator modulates and cancels the modulated component of the interrogated wave transmitted, and the data of the response wave is correctly reproduced.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a block diagram showing an embodiment of a transponder according to the present invention. This transponder performs bidirectional communication using microwaves, and includes an interrogator Q and a responder R.
[0017]
The interrogator Q serves as a interrogator having a reception function for receiving a response wave S ₃ sent back and has a transmission function of transmitting Shokomiha S ₁ and interrogating wave S _2, the control unit 1, the modulation It has a unit 2, a transmission antenna 3, a reception antenna 4, a demodulation unit 5, and a correlator 6, and further includes a distribution circuit 16 and a mixing circuit 17. Note that an external device 7 is connected to the control unit 1.
[0018]
The control unit 1 controls each component in the interrogator Q, transmits and receives data to and from the external device 7, and processes the data. The control unit 1 includes an arithmetic processing device such as a CPU. or the write data transmission data D ₁ of the 7 received and converted into TTL-level data, and outputs to an external device 7 the response data sent from the responder R described later as received data D ₂ .
[0019]
The modulation unit 2 receives the write data output from the control unit 1 and modulates it with a carrier wave of, for example, 2.45 GHz. The modulation wave 2 is a write wave S ₁ and an interrogation wave S ₂ to which the same modulation is applied. Is generated. Transmitting antenna 3 is configured to simultaneously send to the responder R a Shokomiha S ₁ and interrogating wave S ₂ identical modulation is multiplied generated by the modulator 2. Then, with the control unit 1, a modulator 2, in the transmitting antenna 3, constitutes a transmission function side that transmits Shokomiha S ₁ and interrogating wave S _2.
[0020]
The receiving antenna 4 is configured to receive a response wave S ₃ returned from the responder R described later. Demodulator 5 detects capture a response wave S ₃ received by the receiving antenna 4 and reproduces the response data sent from the responder R. The correlator 6 correlates the response data detected and reproduced by the demodulation unit 5 with, for example, the respective PN codes of "1" and "0" and calculates the correlation value. The data is output to the unit 1. Then, with the receiving antenna 4, a demodulator 5, a correlator 6, in the control unit 1, constitutes a receiving function side to receive a response wave S _3.
[0021]
On the other hand, the responder R, as a response wave S ₃ to spread modulation by reading the received response data to the interrogating wave S ₂ writes the data to receive a write wave S ₁ sent from the interrogator Q to the interrogator Q A first responding antenna 8, a demodulating unit 9, a data processing unit 10, a spread modulating unit 11, a modulating unit 12, a second receiving antenna 13, a transmitting antenna 14 And comprising: Note that another external device 15 is connected to the data processing unit 10.
[0022]
First receiving antenna 8 is for receiving a write wave S ₁ sent from the interrogator Q. Demodulator 9 is for detects captures Shokomiha S ₁ received by the first receiving antenna 8, reproduces the write data sent from the interrogator Q. The data processing unit 10 processes the write data detected and reproduced by the demodulation unit 9 and stores the data in an internal ROM or the like. Then, the write data is sent to another external device 15, and response data is input from the external device 15.
[0023]
The spread modulation unit 11 receives the internal data read from the data processing unit 10, converts the data into a PN code corresponding to, for example, "1" or "0", and performs spread modulation. Modulator 12 is for modulating inputs the response data is spread modulated by the spread modulation unit 11, a question wave S ₂ received this response data with the second receiving antenna 13. In this case, since the question wave S ₂ has already been modulated by the modulator 2 in the interrogator Q, the signal at the modulator 12 is modulated doubly response wave S ₃ is generated. Then, the transmitting antenna 14 is to send back a response wave S ₃ that are double-modulated by the modulator 12 to the interrogator Q.
[0024]
Here, in the present invention, the transmission function of the interrogator Q is such that the write wave S ₁ and the interrogation wave S ₂ to which the same modulation is applied are simultaneously transmitted to the responder R, and the transmission function of the interrogator Q is between the side of the receiving function side, the data of the response wave S ₃ received by the interrogator Q means for canceling the transmitted interrogating wave S ₂ modulation components are provided.
[0025]
That is, as described above, the modulation unit 2 in the interrogator Q receives the write data output from the control unit 1 and, for example, writes the same modulated wave with a carrier wave of 2.45 GHz. It is adapted to generate a S ₁ and interrogating wave S _2. Further, a distribution circuit 16 is provided at a stage subsequent to the modulation unit 2 in the interrogator Q, and a mixing circuit 17 is provided at a stage preceding the demodulation unit 5. The distribution circuit 16 and the mixing circuit 17 are connected by a signal line 18. ing. Then, with the distribution circuit 16, a mixing circuit 17, with the signal line 18 constitute a modulation component canceling means question wave S _2.
[0026]
The distribution circuit 16 is intended to distribute the Shokomiha S ₁ and interrogating wave S ₂ identical modulation is multiplied by the modulation section 2 to a receiving function side, the signal proceeds to the transmitting antenna 3 side, the mixer 17 The signal goes to the side. The mixing circuit 17 takes the distributed write wave S ₁ and interrogation wave S ₂ into the receiving function side, and modulates the response wave S ₃ returned from the responder R and received by the receiving antenna 4. which is so mixed detected by hung interrogation wave S _2. Thus, the for the response wave S ₃ doubly modulated by the modulator 12 in the responder R, can be canceled modulated component of the interrogation wave S ₂ transmitted from the transmission antenna 3 in the interrogator Q.
[0027]
Next, an operation of the transponder thus configured and a communication method in the transponder will be described. First, in the writing of data from the interrogator Q to the responder R is interrogator Q receives the transmission data D ₁ of the external device 7, the write data is converted to TTL level data in the control unit 1 . Then, the write data is modulated at modulation section 2, for example at 2.45GHz carrier, generating a Shokomiha S ₁ and interrogating wave S ₂ identical modulation is applied.
[0028]
Next, Shokomiha S ₁ and interrogating wave S ₂ generated by the modulator 2 is inputted to the distribution circuit 16, Shokomiha S ₁ and question the same modulation is multiplied by the distribution circuit 16 wave S _2, is distributed to the transmitting antenna 3 side in the interrogator Q mixing circuit 17 side. Then, the write wave S ₁ and the interrogation wave S _{2, which} have been subjected to the same modulation, are simultaneously transmitted from the transmission antenna 3 to the responder R using the signal distributed to the transmission antenna 3.
[0029]
The responder R receives the write wave S ₁ from the interrogator Q by the first receiving antenna 8, demodulates the write wave S ₁ by the demodulation unit 9, and writes the write data to the data processing unit 10. After that, the data written in the data processing unit 10 is sent to another external device 15.
[0030]
Next, to read the response data of the responder R, the responder R reads the internal data input from the external device 15 by the data processing unit 10 and sends the read internal data to the spread modulation unit 11 to perform spread modulation. Modulation unit 12 receives the response data spread-modulated by the spread modulation unit 11 modulates this response data by the interrogating wave S ₂ received by the second receiving antenna 13. At this time, since the question wave S ₂ has already been modulated by the modulator 2 in the interrogator Q, the response wave S ₃ is generated a signal in the modulation section 12 is double modulated. Then, the transmitting antenna 14, transmits a response wave S ₃ that are double-modulated by the modulator 12 to the interrogator Q.
[0031]
Response wave S ₃ returned from the transmitting antenna 14 is received by the receiving antenna 4 of the interrogator Q, and inputs to the mixing circuit 17. The write wave S ₁ and the interrogation wave S _{2, which} have been subjected to the same modulation by the modulation unit 2, are input to the mixing circuit 17 after being distributed by the distribution circuit 16. In the mixing circuit 17, the response wave S ₃ thus received, the modulation are mixed detected by interrogating wave S ₂ hung. Thus, the for the response wave S ₃ doubly modulated by the modulator 12 in the responder R, can be canceled modulated component of the interrogation wave S ₂ transmitted from the transmission antenna 3 in the interrogator Q.
[0032]
Data modulation component of the interrogation wave S ₂ is countered by the mixing circuit 17 is inputted to the demodulation unit 5. The demodulation unit 5 detects the data output from the mixing circuit 17, extracts the spread modulation data, and reproduces the response data sent from the responder R. The reproduced response data is input to the correlator 6, and is correlated with, for example, the PN code of "1" or "0" to obtain the correlation value. Then, the obtained correlation value is output to the control unit 1. The control unit 1 determines "1" or "0" from the input correlation value and reproduces the data. Then outputs to an external device 7 to the playback data as received data D _2.
[0033]
By this operation, it transmits a Shokomiha S ₁ and interrogating wave S ₂ in which the same modulation hung from the interrogator Q simultaneously to the responder R, at the same time as writing the data of the write wave S ₁ to the responder R the data of the response wave S ₃ sent back from the responder R can be received by the interrogator Q. Therefore, real-time two-way communication can be performed between the interrogator Q and the responder R.
[0034]
Although the data processing unit 10 is provided in the responder R in FIG. 1, the present invention is not limited to this, and the data processing unit 10 may be moved to the external device 15. Further, the first receiving antenna 8 and the second receiving antenna 13 in the responder R can be combined into one. In this case, although the use Shokomiha S ₁ and interrogating wave S ₂ is shared, it changed over by using a circulator or the like. By doing so, the configuration inside the responder R can be simplified.
[0035]
【The invention's effect】
Since the present invention is configured as described above, according to the communication method in the transponder according to claim 1, a write wave and an interrogation wave to which the same modulation is applied are simultaneously transmitted from the interrogator to the transponder. The interrogator can receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder. This allows the interrogator to receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder. Therefore, real-time two-way communication can be performed between the interrogator and the responder. From this, communication between the interrogator and the transponder can be performed in a short time, and for example, a train detection system or the like can detect the passage of a train in a predetermined short time.
[0036]
According to the second aspect of the present invention, the data of the response wave received by the interrogator is modulated by the interrogator to cancel the modulation component of the transmitted interrogation wave, so that the data of the response wave is changed. Plays correctly.
[0037]
According to the transponder of the third aspect, the transmission function of the interrogator simultaneously transmits the write wave and the interrogation wave to which the same modulation is applied to the transponder, and the transmission function side and the reception function of the interrogator. The modulation component of the interrogation wave provided between the interrogator and the side can cancel the modulation component of the transmitted interrogation wave with respect to the response wave data received by the interrogator. This allows the interrogator to receive the response wave data returned from the transponder at the same time as writing the write wave data to the transponder. Therefore, real-time two-way communication can be performed between the interrogator and the responder. From this, communication between the interrogator and the transponder can be performed in a short time, and for example, a train detection system or the like can detect the passage of a train in a predetermined short time.
[0038]
According to the invention of claim 4, the modulation component canceling means includes a distribution circuit provided on the transmission function side for distributing the same modulated write wave and interrogation wave to the reception function side. And a mixing circuit provided on the receiving function side to take in the distributed writing wave and interrogation wave, so that the distribution circuit on the transmitting function receives the same modulated write wave and interrogation wave. It is distributed to the function side, and the distributed write wave and interrogation wave are taken into the reception function side by the mixing circuit, so that the modulation component of the interrogation wave can be canceled. Therefore, the data of the response wave is correctly reproduced.
[0039]
According to the fifth aspect of the present invention, the mixing circuit mixes and detects the response wave returned from the transponder with the modulated interrogation wave. The modulation component of the interrogated interrogated wave is canceled, and the data of the response wave is correctly reproduced.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a transponder according to the present invention.
FIG. 2 is a block diagram showing a conventional transponder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Control part 2, 12 ... Modulation part 3, 14 ... Transmission antenna 4 ... Reception antenna 5, 9 ... Demodulation part 6 ... Correlator 8 ... First reception antenna 10 ... Data processing part 11 ... Spread modulation part 13 ... 2 receiving antennas 16 distribution circuit 17 mixing circuit 18 signal line Q interrogator R responder

Claims (5)

An interrogator having a transmitting function of transmitting a writing wave and an interrogation wave and having a receiving function of receiving a response wave returned from the interrogator, receiving a writing wave transmitted from the interrogator, writing data, and interrogating the interrogation wave And a transponder that receives the response data, reads the response data, spreads the response data, and returns the response data to the interrogator as a response wave.
The interrogator transmits simultaneously the write wave and the interrogation wave to which the same modulation is applied to the transponder, and writes the write wave data to the transponder, and at the same time, the response wave data returned from the transponder. A communication method in a transponder, characterized in that the communication method receives the message by an interrogator. 2. The communication method according to claim 1, wherein the interrogator modulates the response wave data received by the interrogator to cancel the modulated component of the transmitted interrogation wave. An interrogator having a transmission function of transmitting a write wave and an interrogation wave and having a reception function of receiving a returned response wave,
A transponder that receives a write wave transmitted from the interrogator, writes data, receives an interrogation wave, reads response data, spreads and modulates the response wave, and returns the interrogator as a response wave;
In a transponder comprising
The transmission function of the interrogator shall simultaneously transmit the write wave and the interrogation wave to which the same modulation has been applied to the transponder,
A transponder, comprising means for canceling the modulated component of the transmitted interrogation wave with respect to the response wave data received by the interrogator, between the transmission function side and the reception function side of the interrogator. The modulation component canceling means includes a distribution circuit provided on the transmission function side for distributing the same modulated write wave and interrogation wave to the reception function side, and a distribution circuit provided on the reception function side. 4. The transponder according to claim 3, further comprising a mixing circuit for taking in the interrogation wave and the interrogation wave. 5. The transponder according to claim 4, wherein the mixing circuit mixes and detects the response wave returned from the transponder with the modulated interrogation wave.

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