JPH05167471A - Mobile object identification device - Google Patents

Abstract

PURPOSE:To send ID information of a responder located only within a setting range from an interrogator by discriminating whether or not the responder is located within the setting range. CONSTITUTION:A quasi-microwave sent from an antenna 14 is modulated by a responder 15, radiates again and is received by the antenna 14 again. A decoding circuit 16 decodes ID information of the responder 15 from the received reception signal and a reception electric field strength measurement circuit 18 measures an electric field strength of the radiating wave again to be received. A distance discrimination circuit 17 converts the electric field strength information into distance information and compares and discriminates reference distance information inputted and set by a reference distance setting circuit 21 in advance. When the distance discrimination circuit 17 discriminates the distance to be within a prescribed distance from the result of discrimination, a signal control section 19 sends the ID information decoded by the decoding circuit 16 from an external device connection terminal 20 by a signal control section 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body identifying apparatus for identifying unique identifying information of moving bodies such as trains and automobiles (hereinafter referred to as ID information as necessary).

[0002]

2. Description of the Related Art Conventionally, in this type of moving body identifying apparatus, a transponder detects a quasi-microwave and re-radiates a radio wave modulated based on the received and stored ID information.

An interrogator for inquiring ID information to this transponder is equipped with a quasi-microwave band oscillation circuit and a power amplification circuit, receives the modulated wave from the transponder, and further decodes the ID signal. Information is being sent to an external device.

[0004]

However, in the conventional moving body identifying apparatus, when the re-radiated wave from the responder is received and processed, the distance to the responder cannot be determined. Therefore, the ID information due to the reception of re-radiation from the transponder located outside the desired range is also transmitted from the interrogator. As described above, there is a drawback that the ID information of the transponder located only within the desired range cannot be transmitted from the interrogator.

The present invention solves such a conventional problem, and it is possible to determine whether or not the transponder is located within a set distance, and the I of the transponder located only within the set range.
It is an object of the present invention to provide an excellent mobile body identification device that can send D information from an interrogator.

[0006]

In order to achieve this object, a moving body identifying apparatus of the present invention receives a quasi-microwave and regenerates a modulated wave based on the detected and stored individual identification information. The interrogator has a radiating responder and an interrogator for inquiring the individual identification information to the responder. The interrogator receives the modulated wave re-radiated from the responder and decodes the individual identification information from the received signal. Distance for calculating the distance between the identification information decoding means, the electric field strength measuring means for receiving the modulated wave re-radiated from the responder and measuring the received electric field strength from the received signal, and the responder from the received electric field strength The calculating means, the responder position determining means for determining whether or not the responder is located within a preset distance set from the calculated distance, and the responder position determining means are for placing the responder within the preset distance. Only when it is determined that the decrypted individual Those having a individual identification information sending means for sending the different information.

[0007]

Therefore, according to the moving body identifying apparatus of the present invention, the distance between the responder and the responder is calculated from the signal level received by the interrogator, and it is determined that the responder is located within the set distance. In this case, the decrypted individual identification information is sent to an external device, etc., so that it is possible to determine whether or not the transponder is located within the set distance, and ID information of the transponder located only within the set range. Can be sent from the interrogator.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the moving body identifying apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the embodiment. Figure 1
In, 1 is an interrogator, and in this interrogator 1,
Reference numeral 11 is an oscillation circuit, 12 is a power amplifier circuit, 13 is a circulator, and 14 is an antenna. Reference numeral 15 is a transponder, and 16 is a decoding circuit.

Reference numeral 17 is a distance discriminating circuit, 18 is a received electric field strength measuring circuit, 19 is a signal control unit, 20 is an external device connecting terminal, and 21 is a reference distance setting circuit.

FIG. 2 shows the interrogator 1 and the responder 15 of this configuration.
The actual arrangement state of is shown. In FIG. 2, reference numeral 22 denotes an interrogator (corresponding to the interrogator 1 in FIG. 1). Two
3 is a moving body, 24 is a transponder attached to the moving body 23 (corresponding to the transponder 15 shown in FIG. 1), 25 is a moving body,
Reference numeral 26 denotes a transponder attached to the moving body 25 (corresponding to the transponder 15 shown in FIG. 1), and 27 denotes a communication traffic lane. Lane width information of the communication traffic lane 27 is preset in the interrogator 22.

Next, the operation of this configuration will be described. In FIG. 1, the quasi-microwave is transmitted from the antenna 14 through the circulator 13. The quasi-microwave transmitted from the antenna 14 is re-radiated after being modulated by the transponder 15. This re-radiated wave is again received by the antenna 14. The received signal received is supplied to the decoding circuit 16 and the received electric field strength measuring circuit 18 through the circulator 13. The decoding circuit 16 decodes the ID information of the responder 15. The reception electric field intensity measuring circuit 18 measures the electric field intensity of the received re-radiated wave and obtains the electric field intensity information from the distance discriminating circuit 1.
Send to 7. The distance discriminating circuit 17 converts the electric field intensity information supplied from the received electric field intensity measuring circuit 18 into distance information, and compares and discriminates it with the reference distance information previously input and set from the reference distance setting circuit 21. Signal controller 1
In No. 9, the responder 15 is determined from the determination result of the distance determination circuit 17.
When it is determined that is located within the set distance, the ID information decoded by the decoding circuit 16 is sent from the external device connection terminal 20.

In FIG. 2, the mobile unit 23 having the responder 24 attached thereto passes through the communication traffic lane 26 in front of the interrogator 22. In this case, the signal controller 19 determines that the responder 24 is located within the preset distance set in the reference distance setting circuit 21 in the interrogator 22. As a result, the external device connection terminal 2 is connected to the external device (not shown) from the signal control unit 19.
ID information is transmitted through 0.

In addition, when the moving body 25 to which the responder 26 is attached passes through the outside of the communication traffic lane 27, it is separated from the reference distance setting circuit 21 in the interrogator 22 by a distance larger than the preset distance. The signal control unit 19 determines that there is. As a result, the interrogator 22 does not send the ID information of the responder 26 from the external device connection terminal 20.

In this way, the distance between the responders 24 and 26 is calculated from the signal level received by the interrogator 22,
Only when it is determined that the transponder 24 is located within the preset distance, the decoded individual identification information is sent to the external device or the like. Therefore, the ID information of the transponder located only within the preset range is queried. Can be sent from the container. In this case, a plurality of transponders can be arranged according to the purpose and application to enable versatile mobile body identification.

[0016]

As is apparent from the above description, the moving body identifying apparatus of the present invention calculates the distance from the responder to the signal level received by the interrogator, and the responder is within the set distance. Since the decoded individual identification information is sent to the external device only when it is determined that the transponder is located, it can be determined whether or not the transponder is located within the set distance, and only within the set range. This has the effect that the ID information of the transponder located can be transmitted from the interrogator.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a moving body identifying apparatus of the present invention.

FIG. 2 is a configuration diagram showing an actual arrangement state of an interrogator and a responder in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Interrogator 11 Oscillation circuit 14 Antenna 15 Responder 16 Decoding circuit 17 Distance discrimination circuit 18 Received electric field strength measurement circuit 19 Signal control unit 21 Reference distance setting circuit

Claims (1)

[Claims] 1. A transponder that receives a quasi-microwave and re-radiates a modulated wave based on the detected and stored individual identification information, and an interrogator that queries the individual response information for the individual identification information. However, the interrogator receives the modulated wave re-radiated from the responder, the individual identification information decoding means for decoding the individual identification information from the received signal, and the modulated wave re-radiated from the responder Electric field strength measuring means for receiving and measuring the received electric field strength from the received signal, distance calculating means for calculating the distance between the received electric field strength and the responder, and within a preset distance set from the calculated distance Only when the transponder position determining means determines whether or not the transponder is located, and the transponder position determining means determines that the transponder is located within a set distance. Individual knowledge to send information A moving body identification device comprising: separate information sending means.