JP2012244517A - Gate system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the false recognition of a user in a gate system using electric field communication.SOLUTION: A gate system includes: a main electrode 11 installed inside a gate, an auxiliary electrode 12 installed at an entrance side of the gate; a main transceiver 14 capable of electric field communication; an auxiliary transceiver 13 capable of electric field communication; a computer 15 which discriminates whether or not a user carrying a portable terminal is in an authentication area in the gate using a signal from the portable terminal received by the main transceiver 14 and the auxiliary transceiver 13. The computer 15 discriminates that the portable terminal is in the authentication area if only the main transceiver 14 has received a signal transmitted by the portable terminal.

Description

  The present invention relates to a gate system using electric field communication technology.

  Wearable computers are attracting attention due to the miniaturization and performance enhancement of portable terminals, and FIG. 14 shows an example in which such wearable computers are used while being worn by humans. As shown in the figure, the wearable computer 7 is mounted on a person's arm, shoulder, torso, etc. via a transceiver 9 to transmit / receive data to / from each other, and is further provided on the wall or floor so that it can be touched by the tip of a limb. Communication is performed with a computer 8 provided outside via the transceivers 9a and 9b and cables.

  Here, the transceiver 9 used for data communication between the wearable computer 7 and between the wearable computer 7 and the computer 8 induces an electric field based on information to be transmitted to a living body that is an electric field transmission medium. Information is transmitted and received using an induced electric field. The transceiver 9 is described in Patent Document 1 and Patent Document 2.

JP 2001-352298 A JP 2006-081111 A

  When the user carrying the portable terminal as described above contacts the electrode, the portable terminal and the computer communicate with each other via the transceiver connected to the electrode. From the electrode connected to the transceiver, an electric field is radiated perpendicularly to the electrode surface, and the radiated electric field has a spread. Therefore, the electric field radiated from the electrode spreads over a wide area, and unnecessary electric fields are radiated to other users in the vicinity other than the target user, and erroneous recognition and malfunction occur due to unintended electrostatic coupling (electric field coupling). There is a case.

  For example, in the case of the gate system shown in FIG. 15, the electrode installed in the gate and the user (human body or portable terminal) in front of the authentication area are capacitively coupled, and a transmission path is formed between the portable terminal and the electrode. Will be formed. As a result, even when the user is outside the authentication area of the gate, electric field communication is performed, and in the illustrated example, erroneous recognition and malfunction that the user is authenticated before entering the gate occur.

  In the case of the gate system shown in FIG. 16, the current user in the authentication area and the next user (human body or mobile terminal) in front of the gate are capacitively coupled, and the mobile terminal of the next user and the electrode are connected. A transmission path is formed between them. In this case, there is a problem that the current user who does not have the portable terminal passes through the gate illegally because the signal from the portable terminal of the next user is received by the electrode and the transceiver.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to prevent user misrecognition in a gate system using electric field communication.

  In order to achieve the above object, the present invention provides a gate system that performs electric field communication with a portable terminal carried by a user, the main electrode being installed inside one of a pair of gates, and the one gate. An auxiliary electrode installed on the inlet side of the main transceiver, a main transceiver connected to the main electrode and capable of electric field communication with the portable terminal, and an auxiliary transceiver connected to the auxiliary electrode and capable of electric field communication with the portable terminal. A computer for determining whether or not a user carrying the portable terminal exists in an authentication area in the gate using a signal from the portable terminal received by the main transceiver and the auxiliary transceiver; And the computer determines that the portable terminal exists in the authentication area when only the main transceiver receives a signal transmitted by the portable terminal. That.

  Further, the present invention is a gate system that performs electric field communication with a portable terminal carried by a user, the main electrode installed inside one gate of a pair of gates, and installed on the outlet side of the one gate An auxiliary electrode connected to the main electrode and capable of electric field communication with the portable terminal; an auxiliary transceiver connected to the auxiliary electrode and capable of electric field communication with the portable terminal; and the main transceiver; A computer for determining whether a user carrying the portable terminal exists in an authentication area in the gate using a signal received by the auxiliary transceiver from the portable terminal; When only the main transceiver receives a signal transmitted by the portable terminal, it is determined that the portable terminal exists in the authentication area.

  ADVANTAGE OF THE INVENTION According to this invention, the misrecognition of a user can be prevented in the gate system using electric field communication.

1 is an overall configuration diagram of a gate system according to an embodiment of the present invention. It is a block diagram which shows the structural example of a transceiver. It is explanatory drawing explaining the determination process in case a user is in front of a gate. It is explanatory drawing explaining the determination process in case a user is in the authentication area in a gate. It is explanatory drawing explaining the determination process in case the present user is in the authentication area in a gate and the next user is in front of a gate. This is an example in which auxiliary electrodes are provided on both gates. This is an example in which an auxiliary electrode is provided by forming a notch on the side surface of the gate. This is an example in which the main electrode is laid on the floor of the authentication area in the gate. This is an example in which the main electrode is installed on the upper surface of the gate. It is a figure explaining the structure of a main electrode and an auxiliary electrode. It is a figure which shows a peripheral electric field at the time of installing an electrode plate (flat plate) in parallel. It is a figure which shows the relationship between a user's position, and the signal level which an auxiliary electrode and a main electrode receive. It is a figure which shows the shielding board which covers an auxiliary electrode. It is a figure which shows the example in the case of mounting | wearing and using a wearable computer for a person via a transceiver. It is explanatory drawing in the case of misrecognizing the user before gate entrance. It is explanatory drawing when passing a gate illegally.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram for describing a gate system using electric field communication according to an embodiment of the present invention, and is a top view of the gate system as viewed from above. The illustrated gate system includes a main electrode 11, a main transceiver 14 connected to the main electrode 11 for electric field communication, an auxiliary electrode 12, an auxiliary transceiver 13 connected to the auxiliary electrode 12 for electric field communication, a main transceiver 14 and And a computer 15 connected to the auxiliary transceiver 13.

  The main electrode 11 and the auxiliary electrode 12 are installed on one gate 32 of the pair of gates 31 and 32. In the illustrated example, the main electrode 11 is installed on the side surface (side wall) on the passage side (inside) of the gate 32. That is, the main electrode 11 is installed at a position where capacitive coupling or contact with the current user in the authentication area is easy.

  The auxiliary electrode 12 is installed on the front surface (front wall) on the entrance side of one gate 32. That is, the auxiliary electrode 12 and the next user (or non-target person) in front of the gate are not blind spots, and the auxiliary electrode 12 is installed at a position where the auxiliary electrode 12 and the next user can be capacitively coupled. Further, the auxiliary electrode 12 and the current user in the authentication area in the gate are blind spots, and the auxiliary electrode 12 is installed at a position where capacitive coupling between the auxiliary electrode 12 and the current user is impossible. In the example shown in the figure, the authentication area and the auxiliary electrode 12 become blind spots by the gate 32, and the main electrode 11 and the auxiliary electrode 12 are installed with their directions shifted (90 ° in this case). That is, the auxiliary electrode is installed at a position where a communication area different from the authentication area by the main electrode is formed outside the gate.

  The auxiliary transceiver 13 and the main transceiver 14 use an electric field signal detection technique, induce an electric field based on information to be transmitted in an electric field transmission medium, and transmit / receive information using the induced electric field. The transceivers 13 and 14 have the configuration shown in FIG. 2, for example. When the transmission data from the computer 15 is received via the input / output (I / O) circuit 901, the transmission data is transmitted via the transmission unit 902. The electric field is supplied to the electrodes (main electrode 11 and auxiliary electrode 12), an electric field is induced in the electric field transmission medium via the electrodes, and the electric field is transmitted to other parts of the electric field transmission medium. The transceivers 13 and 14 detect the electric field induced and transmitted by the electric field transmission medium with the electrodes 11 and 12, and couple the electric field to the electric field detection unit 905 to convert it into an electric signal. This electric signal is subjected to signal processing such as amplification and noise removal by the signal processing circuit 906, further subjected to waveform shaping by the waveform shaping circuit 907, and output to the computer 15 via the input / output circuit 901. ing.

  The computer 15 determines whether or not the user is present in the authentication area in the gate by using a signal received by the main transceiver 14 and the auxiliary transceiver 13 from the portable terminal carried by the user. Specifically, when only the main transceiver 14 receives a signal transmitted by the mobile terminal, it is determined that the mobile terminal exists in the authentication area. Further, when the main transceiver 14 receives signals transmitted from a plurality of portable terminals, the computer 15 determines that the portable terminal that has transmitted signals received by both the main transceiver 14 and the auxiliary transceiver 13 exists outside the authentication area. Then, it is determined that the mobile terminal that has transmitted the signal received only by the main transceiver 14 exists in the authentication area.

  Next, a process for determining the position of the user in the gate system of this embodiment will be described.

  FIG. 3 is an explanatory diagram illustrating a determination process when the user carrying the mobile terminal 21 is in front of the gate (outside the authentication area). In the example shown in FIG. 3, before the user carrying the mobile terminal 21 enters the gates 31 and 32 provided in the passage for entering a ticket gate of a station or a predetermined area, for example, before the gate (authentication). Outside the area).

  The user's mobile terminal 21 includes a computer and a transceiver. The computer of the portable terminal 21 transmits the ID stored in the storage unit such as a memory using a transceiver. The transceiver of the portable terminal 21 is similar to the transceiver described in FIG. 2 and performs electric field communication.

  In the example shown in the figure, capacitive coupling occurs between the user (mobile terminal 21) and the main electrode 11, and a first communication path (path 1) is formed between the mobile terminal 21 and the main electrode 11. The Thereby, the mobile terminal 21 can communicate with the main transceiver 14. Further, capacitive coupling occurs between the user (mobile terminal 21) and the auxiliary electrode 12, and a second communication path (path 2) is formed between the mobile terminal 21 and the auxiliary electrode 12. Thereby, the portable terminal 21 can communicate with the auxiliary transceiver 13.

  Further, it is assumed that the main electrode 11 of this embodiment constantly transmits a request signal under the control of the computer 15 or the main transceiver 14. The electric field of the request signal radiated from the main electrode 11 to the atmosphere is capacitively coupled with a nearby user (mobile terminal 21) outside the authentication area, and the request signal is received by the mobile terminal 21 through the first communication path. The

  When receiving the request signal, the portable terminal 21 transmits a response signal including the ID stored in the storage unit. The electric field of the response signal radiated from the transceiver electrode of the mobile terminal 21 to the atmosphere is capacitively coupled to the main electrode 11, and the response signal is received by the main transceiver 14 through the first communication path. The electric field of the response signal is also capacitively coupled with the auxiliary electrode 12, and the response signal is received by the auxiliary transceiver 13 through the second communication path.

  The main transceiver 14 outputs the received response signal to the computer 15, and the auxiliary transceiver 13 outputs the received response signal to the computer 15. The computer 15 receives a response signal for the transmitted request signal from the main transceiver 14 and the auxiliary transceiver 13, and the two response signals have the same ID (that is, the response signals transmitted from the same mobile terminal 21). The user carrying the mobile terminal 21 determines that he is outside the appropriate authentication area. In the illustrated example, it is determined that the user is in front of the gate.

  In this case, the computer 15 determines that the user is a non-target person outside the authentication area, and performs user authentication processing by ID, billing processing, and gate door (not shown) opening / closing processing according to the authentication / billing result. The received two response signals are discarded without performing predetermined processing such as.

  FIG. 4 is an explanatory diagram illustrating a determination process when the user carrying the mobile terminal 21 is in the authentication area in the gate.

  In this case, the request signal transmitted from the main electrode 11 is received by the portable terminal 21 by capacitive coupling (or when the user contacts the main electrode 11). When receiving the request signal, the portable terminal 21 transmits a response signal including the ID stored in the storage unit. The electric field of the response signal transmitted from the portable terminal 21 is capacitively coupled with the main electrode 11, whereby the response signal is received by the main transceiver 14 and output to the computer 15.

  On the other hand, although the electric field of the response signal transmitted from the portable terminal 21 has a spread, as described above, the authentication area and the auxiliary electrode 12 are blind spots due to the gate 32. Therefore, the electric field of the response signal is not capacitively coupled with the auxiliary electrode 12, and the auxiliary transceiver 13 does not receive the response signal. Therefore, the auxiliary transceiver 13 does not output a response signal to the computer 15.

  When the computer 15 receives a response signal to the request signal from only the main transceiver 14 (first communication path), the computer 15 determines that the user carrying the mobile terminal 21 is in an appropriate authentication area. In this case, the computer 15 determines that the user is a target person in the authentication area, and performs predetermined processing such as user authentication processing and charging processing based on the ID of the response signal.

  FIG. 5 is an explanatory diagram illustrating a determination process when the current user carrying the mobile terminal 21A is in the authentication area in the gate and the next user carrying the mobile terminal 21B is outside the authentication area in front of the gate. is there.

  In the illustrated example, capacitive coupling occurs between the next user carrying the mobile terminal 21B and the current user carrying the mobile terminal 21A, and the current user carrying the mobile terminal 21A and the main electrode 11 And the first communication path (path 1) via the current user (mobile terminal 21A) is formed between the mobile terminal 21B and the main electrode 11. Thereby, the portable terminal 21B and the portable terminal 21A can communicate with the main transceiver 14.

  In addition, the second user carrying the portable terminal 21B and the auxiliary electrode 12 are capacitively coupled to form a second communication path (path 2) between the portable terminal 21B and the auxiliary electrode 12, and the portable terminal 21B. Can communicate with the auxiliary transceiver 13.

  In this case, the request signal transmitted from the main electrode 11 is received by the mobile terminal 21A of the current user via the first communication path. Thereby, 21 A of portable terminals transmit the response signal containing ID: A memorize | stored in the memory | storage part to the main electrode 11 and the main transceiver 14 via the 1st communication path. The main transceiver 14 outputs the received response signal (ID: A) to the computer 15.

  Further, the request signal transmitted from the main electrode 11 is also received by the mobile terminal 21B of the next user via the first communication path. Thereby, the portable terminal 21B transmits a response signal including ID: B stored in the storage unit. The response signal is transmitted to the main electrode 11 and the main transceiver 14 via the first communication path, and is transmitted to the auxiliary electrode 12 and the auxiliary transceiver 13 via the second communication path. The main transceiver 14 and the auxiliary transceiver 13 each output the received response signal (ID: B) to the computer 15.

The computer 15 receives a response signal (ID: A) and a response signal (ID: B) from the main transceiver 14 as a response signal to the request signal, and receives a response signal (ID: B) from the auxiliary transceiver 13. To do. In this case, since the computer 15 has received the response signal (ID: B) from both the main transceiver 14 (first communication path) and the auxiliary transceiver 13 (second communication path), the portable terminal It is determined that 21B is outside the authentication area (in the illustrated example, before the gate), and the two response signals (ID: B) are discarded without performing predetermined processing such as user authentication processing and billing processing. When the signal level is weak, the response signal (ID: B) may be received only from the auxiliary transceiver 13 (second communication path). In this case, the response signal (ID: B) is discarded. The
On the other hand, since the computer 15 receives the response signal (ID: A) only from the main transceiver 14 (first communication path), the computer 15 determines that the mobile terminal 21A is in the authentication area, and the response signal ( Predetermined processing such as user authentication processing by ID: A) and billing processing is performed. That is, it is determined that the user who carries the mobile terminal 21A is the current user to be processed.

  Next, a modified example of the arrangement of the auxiliary electrode 12 will be described.

  FIG. 6 shows an example in which auxiliary electrodes 12 and 12A are installed on the front walls of both gates 31 and 32. FIG. In FIG. 6, response signals transmitted from the three transceivers 13, 13 </ b> A, and 14 are input to the computer 15. By installing the auxiliary transceivers 13 and 13A on the left and right gates 31 and 32, the detection accuracy of the user can be improved. That is, depending on the standing position of the next user (non-target person) outside the authentication area and the mounting position of the mobile terminal 21, the response of the mobile terminal 21 that should be received from the auxiliary transceiver 13 (second communication path) originally. A signal may not be received, and a response signal from only the main transceiver 14 (first communication path) may be input to the computer 15. On the other hand, in FIG. 6, by providing two auxiliary electrodes, the electric field of the response signal is capacitively coupled with at least one of the auxiliary electrodes, and the response signal is transmitted with one of the auxiliary transceivers (second communication path). Since it is received and input to the computer 15, it is possible to prevent erroneous recognition.

  FIG. 7 shows an example in which a notch is formed in the side surface of the gate 32 and the auxiliary electrode 12B is installed in the direction toward the exit (the direction not facing the authentication area). The auxiliary electrode 12B is a target current user when a plurality of users carrying the mobile terminals 21A and 21B (the current user to be processed and the previous user who has already been processed) exist in the gate. It is for discriminating.

  Specifically, a response signal (ID: A) of the mobile terminal 21A of the current user and a response signal (ID: B) of the mobile terminal 21B of the previous user are sent to the main transceiver 14 via the main electrode 11. Is received. Further, the auxiliary transceiver 13 receives the response signal (ID: B) of the previous user's mobile terminal 21B via the auxiliary electrode 12B. Since the response signal (ID: B) is received from both the main transceiver 14 and the auxiliary transceiver 13, the computer 15 determines that it is a non-target previous user outside the authentication area, and determines two response signals ( Discard ID: B). On the other hand, since the response signal (ID: A) is received only from the main transceiver 14, it is determined that the current user is the target within the authentication area, and a predetermined process is performed.

  As a result, it is possible to discriminate between the current user to be processed and the previous user who has already been processed, and erroneously recognizing the previous user as the current user. In addition to the auxiliary electrode 12B, the auxiliary electrode 12 described in FIG. 1 and the like may be further provided on the front walls of the gate 32 and the gate 31.

  Next, a modified example of the arrangement of the main electrode 11 will be described.

  FIG. 8 shows an example in which the main electrode 11 is laid on the floor of the authentication area 22 in the gate. In this case, when the user carrying the mobile terminal 21 contacts the main electrode 11 on the floor, a communication path using the user's human body as an electric field transmission medium is formed, and the mobile terminal 21 and the main transceiver 14 are connected. Communication is possible.

  FIG. 9 is an example in which the main electrode 11 is installed on the upper surface of the gate 32 so that a user in the authentication area 22 can touch (touch) it by hand. In this case, when the user carrying the mobile terminal 21 touches the main electrode 11 by hand, a communication path using the user's human body as the electric field transmission medium is formed, and the mobile terminal 21 and the main transceiver 14 are connected. Communication is possible.

  Next, the structure of the main electrode 11 and the auxiliary electrode 12 will be described.

  10A is a plan view of the main electrode 11 and the auxiliary electrode 12, and FIG. 10B is a cross-sectional view. As shown in FIG. 10B, the main electrode 11 and the auxiliary electrode 12 have a structure in which an insulator 43 is sandwiched between conductors 41 and 42 from both sides. For example, an air layer is used for the insulator 43, and a copper plate or the like is used for the conductors 41 and 42, for example.

  The distance between the conductors 41 and 42 (that is, the thickness of the insulator 43) is, for example, about several mm to 1 cm. The size of the main electrode 11 is, for example, about 30 cm × 30 cm (see FIG. 1) when installed on the wall of the gate, and about 50 cm × 60 cm (see FIG. 8) to prevent stepping when installed on the floor. When installed on the upper surface of the gate, it is conceivable that the palm size is about 10 cm × 10 cm (see FIG. 9). For example, the size of the auxiliary electrode 12 may be about 10 cm × 50 cm.

  Next, the direction dependency of the electrode plate will be described.

  FIG. 11 is a diagram showing a peripheral electric field when electrode plates (flat plates) are installed in parallel. The electric field is inversely proportional to the cube of the distance and has a distance dependency that becomes weaker as the distance from the electrode plate increases, and a direction dependency that becomes maximum in the horizontal direction of the electrode plate and minimum in the vertical direction. In this embodiment, this principle is utilized, and the user is positioned in the horizontal direction of the auxiliary electrode 12 (electrode plate) before the gate, so that the capacitive coupling between the user and the auxiliary electrode 12 is strong. On the other hand, since the user is positioned in the vertical direction of the auxiliary electrode 12 (electrode plate) in the gate, the capacitive coupling between the user and the auxiliary electrode 12 is weak.

  FIG. 12 shows the relationship between the position of the user carrying the mobile terminal 21 and the signal level received by the auxiliary electrode 12 and the main electrode 11. In the example shown in the drawing, the signal level at the position t before the authentication area is set as a threshold T that is regarded as a signal. Communication between the mobile terminal 21 and the auxiliary electrode 12 is established in the sections 1 and 2 exceeding the threshold T, and the auxiliary electrode 12 (auxiliary transceiver 13) receives a response signal transmitted by the mobile terminal 21 in this section. Communication between the mobile terminal 21 and the main electrode 11 is established in the sections 2 and 3 exceeding the threshold T, and the main electrode 11 (the main transceiver 14) receives a response signal transmitted from the mobile terminal 21 in this section. Thus, in the section 3 in which only the main electrode 11 (main transceiver 14) receives the response signal, the computer 15 determines that the user is in an appropriate authentication area.

  In the present embodiment described above, whether or not the user having the mobile terminal 21 exists in the authentication area in the gate using the response signal from the mobile terminal 21 output from the main transceiver 14 and the auxiliary transceiver 13 ( The user's position). That is, when only the main transceiver 14 receives the response signal, it is determined that the user carrying the portable terminal 21 exists in the authentication area, and both the main transceiver 14 and the auxiliary transceiver 13 receive the response signal with the same ID. In this case, it is determined that the user carrying the mobile terminal 21 is a non-target user who does not exist in the authentication area.

  Thereby, in this embodiment, it is possible to prevent misidentification of a user who is in an inappropriate position such as before entering the gate (before the gate), and appropriate entry / exit processing is performed only for users in the authentication area. Can be realized. In addition, it is possible to prevent unauthorized passage of a user who does not have a portable terminal (such as sharing).

  In the present embodiment, when the main transceiver 14 receives signals transmitted from the plurality of portable terminals 21, the portable terminal that has transmitted signals received by both the main transceiver 14 and the auxiliary transceiver 13 exists outside the authentication area. Then, it is determined that the portable terminal that has transmitted the signal received only by the main transceiver is present in the authentication area. This can prevent misidentification between the next user before the gate and the current user in the authentication area.

  In the present embodiment, the auxiliary electrode 12 is disposed on the gate so as to be displaced from the main electrode 11, and is disposed at a position that is a blind spot from the authentication area by the gate. Thereby, since the user (mobile terminal 21) in the authentication area in the gate and the auxiliary electrode 12 are not electrostatically coupled, the response signal of the mobile terminal 21 is transmitted only from the main electrode 11 (first communication path). Received.

  In the present embodiment, the auxiliary electrode 12 is installed on the exit side of the gate. Thereby, in this embodiment, even if there are a plurality of users (current user and previous user) in the gate, the current user can be appropriately determined.

  In addition, this invention is not limited to the said embodiment, Many deformation | transformation are possible within the range of the summary.

  For example, as shown in FIG. 13, the auxiliary electrode 12 of the above embodiment may be covered with a shielding plate 18, and the shielding plate 18 may be connected to the ground and grounded. Thereby, the directivity of capacitive coupling between the auxiliary electrode 12 and the user (mobile terminal 21) can be further increased. Specifically, only in the area 201 on the side not covered with the shielding plate 18, the auxiliary electrode 12 and the user (mobile terminal 21) are capacitively coupled, and the area 202 on the side covered with the shielding plate 18, In 203, the auxiliary electrode 12 and the user (mobile terminal 21) are not capacitively coupled. Similarly, the authentication area may be controlled more limitedly by covering the main electrode 11 with a shielding plate connected to the ground.

  In the above embodiment, the main electrode 11 and the auxiliary electrode 12 are described as being installed at the gate of the gate system. However, the present invention is not limited to the gate system, and is a system for various applications. Can be applied.

11 Main electrode 12 Auxiliary electrode 13 Auxiliary transceiver 14 Main transceiver 15 Computer 21 Portable terminal 31, 32 Gate

Claims (5)

A gate system for electric field communication with a portable terminal carried by a user,
A main electrode installed inside one gate of the pair of gates;
An auxiliary electrode installed on the entrance side of the one gate;
A main transceiver connected to the main electrode and capable of electric field communication with the mobile terminal;
An auxiliary transceiver connected to the auxiliary electrode and capable of electric field communication with the mobile terminal;
A computer for determining whether a user carrying the portable terminal is present in the authentication area in the gate using signals from the portable terminal received by the main transceiver and the auxiliary transceiver. And
The gate system, wherein only when the main transceiver receives a signal transmitted by the portable terminal, the computer determines that the portable terminal exists in the authentication area. The gate system according to claim 1,
When the main transceiver receives a signal transmitted from a plurality of portable terminals, the computer determines that the portable terminal that has transmitted a signal received by both the main transceiver and the auxiliary transceiver exists outside the authentication area. A gate system that determines that a mobile terminal that has transmitted a signal received only by the main transceiver exists in the authentication area. A gate system according to claim 1 or claim 2, wherein
The gate system is characterized in that the auxiliary electrode is disposed on the one gate with a direction shifted from the main electrode, and is disposed at a position that forms a different communication area outside the authentication area. The gate system according to claim 1,
The gate system further comprising a shielding plate that shields the auxiliary electrode and is connected to the ground. A gate system for electric field communication with a portable terminal carried by a user,
A main electrode installed inside one gate of the pair of gates;
An auxiliary electrode installed on the exit side of the one gate;
A main transceiver connected to the main electrode and capable of electric field communication with the mobile terminal;
An auxiliary transceiver connected to the auxiliary electrode and capable of electric field communication with the mobile terminal;
A computer for determining whether a user carrying the portable terminal is present in the authentication area in the gate using signals from the portable terminal received by the main transceiver and the auxiliary transceiver. And
The gate system, wherein only when the main transceiver receives a signal transmitted by the portable terminal, the computer determines that the portable terminal exists in the authentication area.

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