KR101540305B1 - Apparatus and method for watching entrance - Google Patents

Abstract

The present invention relates to an access monitoring system and method, and more particularly, to an access monitoring system and method for determining the direction of movement of an identification signal transmitting apparatus by disposing three or more antennas for receiving an identification signal in a row, will be.
An access monitoring system according to an embodiment of the present invention includes an antenna unit configured by a plurality of antennas and an identification signal transmitting apparatus that transmits the identification signal by referring to the identification signal detected by the plurality of antennas, And a controller for referring to the detection pattern to determine a moving direction of the identification signal transmitting apparatus.

Description

[0001] Apparatus and method for watching entrance [0002]

The present invention relates to an access monitoring system and method, and more particularly, to an access monitoring system and method for identifying an erroneous antenna by arranging three or more antennas for receiving identification signals in a line to determine a moving direction of an identification signal transmitting apparatus, And methods.

An RFID system consists of a transponder that stores unique information, a transceiver (reader or reader) that reads and decodes, a server (host computer), a network, and application programs (ERP, SCM).

A transponder, often referred to as a tag, is composed of an IC chip and an antenna, and has various shapes and sizes. Transponders transplanted under the skin to track animals are as small as the diameter of the pencil and only one centimeter in length. The major functions of the IC chip are the memory size (25 bit ~ 512 kb), memory type (read only, readable type, write once and read many times), memory type (EEPROM, FRAM) The price is different according to.

The RFID system can be classified into an inductively coupled system and an electromagnetic wave system according to a wireless access system. The mutual induction method is used for short distance (within 1m), the electromagnetic wave method is used for long distance RFID, the mutual induction method uses coil antenna, and the electromagnetic wave method uses radio frequency antenna for wireless connection with each other.

In the mutual induction mode, the transponder operates almost manually. That is, all the energy required for the IC chip of the transponder to operate is supplied by the transceiver. Therefore, the antenna coil of the transceiver generates a strong magnetic field in the surrounding area. A portion of the emitted magnetic field generates an inductive voltage on the coil antenna of the transponder that is remote from the transceiver and is then rectified and supplied as energy for the IC. The transponder of the electromagnetic wave type does not receive enough power from the transceiver to drive the IC chip, so there is also an active type that includes an additional battery for long distance recognition.

Transceivers and transponders process baseband data using various digital coding schemes. Wireless signals are mainly converted into high-frequency signals by using three basic digital modulation schemes: Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), and Phase Shift Keying (PSK). However, in a specific frequency band (UHF band in the United States), it is required to use only a specific modulation scheme in order to reduce the human body influence of electromagnetic waves or interference with other communication systems. The most widely used is a spread spectrum (SS) scheme. Of the frequency spreading methods, direct sequence (DS) used in a Code Division Multiple Access (CDMA) mobile phone or a wireless LAN and frequency hopping (FS) used in Bluetooth are mainly used. However, applying such a modulation method to a tag increases the price because it requires a complicated circuit. Therefore, in reality, only the transceiver uses this modulation method, and the transponder makes a wideband to cover the entire frequency of the frequency spread, To transmit signals.

Such an RFID system can be used for entrance and exit management. For example, an RFID system may be installed at a doorway to confirm whether a user or an object attaching a specific tag is in or out.

On the other hand, there may be a situation where it is necessary to judge the entrance direction as well as the entrance / exit direction.

In addition, in the state where only one antenna is provided, if the corresponding antenna malfunctions, it is impossible to check whether the antenna is in or out.

Therefore, there is a need for the emergence of an invention that can not only determine the moving direction of the tag but also prepare for malfunction of the antenna.

Korean Patent Laid-Open Publication No. 10-2009-0104492 (2009.10.06)

An object of the present invention is to dispose three or more antennas for receiving an identification signal in a row so as to determine a moving direction of an identification signal transmitting apparatus and to identify an antenna which malfunctions.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an access monitoring system according to an embodiment of the present invention includes an antenna unit including a plurality of antennas, and an identification signal transmitting apparatus that transmits the identification signal with reference to an identification signal detected by the plurality of antennas And a controller for determining a moving direction of the identification signal transmitting apparatus by referring to the detection pattern of the identification signal.

The method of controlling access according to an embodiment of the present invention includes the steps of identifying an identification signal transmitting apparatus that transmits the identification signal with reference to an identification signal detected by a plurality of antennas, And determining a moving direction of the identification signal transmitting apparatus by referring to the sensing pattern of the detected identification signal.

The details of other embodiments are included in the detailed description and drawings.

According to the entrance and exit monitoring system of the present invention as described above, three or more antennas for receiving identification signals are arranged in a line, thereby determining the moving direction of the identification signal transmitting apparatus and discriminating the malfunctioning antenna.

1 is a view illustrating an access monitoring system according to an embodiment of the present invention.
2 is a block diagram showing a detailed configuration of the data management apparatus shown in FIG.
3 is a diagram illustrating an identification signal transmitting apparatus being detected by three antennas according to an embodiment of the present invention.
4 is a diagram illustrating a sensing frame according to an embodiment of the present invention.
5 is a diagram illustrating a detection table according to an embodiment of the present invention.
6 to 7 are views showing a sensing pattern according to an embodiment of the present invention.
8 to 11 are views showing a sensing pattern according to another embodiment of the present invention.
12 is a diagram illustrating a data table according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

FIG. 1 is a block diagram illustrating an access monitoring system according to an embodiment of the present invention. The access monitoring system 10 includes a data management apparatus 100, a reader 200, and an antenna unit 300.

The antenna unit 300 includes a plurality of antennas 301, 302, and 303, and may include at least three or more antennas. Therefore, it should be noted that the antenna unit 300 including the three antennas 301, 302, and 303 arranged in a row is described below, but it is not limited thereto.

Each of the antennas 301, 302, and 303 included in the antenna unit 300 plays a role of receiving an identification signal from an identification signal transmitter (not shown).

Since the antenna unit 300 includes the three antennas 301, 302, and 303, the antenna unit 300 can operate according to the redundancy. That is, even if one of the three antennas 301, 302, and 303 does not operate normally, the other antenna that normally operates identifies the identification signal transmitting apparatus by receiving the identification signal from the identification signal transmitting apparatus (not shown) It is possible to determine the moving direction of the apparatus. A detailed description thereof will be given later with reference to FIG. 8 through FIG.

The identification signal transmitting apparatus is a device having a built-in tag composed of an IC chip and signal transmitting and receiving means and transmits an identification signal to antennas 301, 302 and 303 of the access monitoring system 10 through short-range wireless communication .

In the present invention, the identification signal transmitting apparatus may be an RFID (Radio Frequency Identification) tag itself or a device attaching an RFID tag. Therefore, the identification signal transmitted by the identification signal transmitting device may be an RFID signal, and the identification signal may include unique identification information given to the identification signal transmitting device.

The identification signal transmitting apparatus can perform communication with the reader 200 using a power source formed by radio waves received from the antennas 301, 302, 303 or using its own power source.

The reader 200 collects and transmits the identification signals received by the antennas 301, 302, and 303 to the data management apparatus 100.

As will be described later, the data management apparatus 100 uses a temporal change in the sensed data, which is information on whether or not the identification signals are received by the plurality of antennas 301, 302, and 303. For this, It is possible to generate data as to whether or not identification signals of the antennas 301, 302, and 303 identified at the same or similar time are received, and transmit the generated data to the data management apparatus 100.

For example, each of the antennas 301, 302, and 303 may transmit information about whether an identification signal is received to the reader 200 at a point in time when they are synchronized with each other. (301, 302, 303) as data and transmits the data to the data management apparatus (100).

Alternatively, each of the antennas 301, 302, and 303 may periodically transmit information on whether an identification signal is received to the reader 200. In this case, the reader 200 may transmit information 301, 302, and 303 as data and transmits the data to the data management apparatus 100. [

Alternatively, only the antenna that has received the identification signal can transmit information on whether the identification signal is received to the reader 200. In this case, the reader 200 receives the identification signal from the antenna, And transmits the generated data to the data management apparatus 100. The data management apparatus 100 receives the identification signal,

The data management apparatus 100 refers to the data received from the reader 200 and confirms what device the identification signal transmitting device currently sensed by the antenna unit 300 is and confirms the moving direction of the identification signal transmitting device Role. A detailed description of the data management apparatus 100 will be given later with reference to FIG.

1 illustrates that the data management apparatus 100 and the reader 200 are implemented as separate devices, but it is needless to say that the data management apparatus 100 and the reader 200 can be integrally implemented. 2, the data management apparatus 100 is implemented in a form in which a plurality of modules are combined. Some of the modules may be included in the reader 200, The reader 200, and the antenna unit 300 may be implemented as a single device.

However, since the direction of movement of the identification signal transmission apparatus should be determined by using the reception of the identification signal for each antenna, it is preferable that the plurality of antennas 301, 302, and 303 are disposed at regular intervals.

In the present invention, it is assumed that the identification signal transmitting apparatus moves on a path parallel to a straight line extending from the first antenna 301 to the third antenna 303. That is, the identification signal transmitting apparatus must pass through all the antennas 301, 302, and 303 existing on the entry / exit path in order to establish access.

Therefore, the identification signal transmitting apparatus is preferentially detected by the first antenna 301 or the third antenna 303, and is not detected by the first antenna 301 or the third antenna 303, ).

Similarly, when the identification signal transmitting apparatus moves from the side of the first antenna 301 to the side of the third antenna 303 or moves from the side of the third antenna 303 to the side of the first antenna 301, You can not go without moving.

2 is a block diagram illustrating the detailed configuration of the data management apparatus 100. The data management apparatus 100 includes a communication unit 110, a storage unit 120, a control unit 130, a message management unit 140, and an output unit 150 .

The communication unit 110 plays a role of receiving data on whether the antennas 301, 302, and 303 receive the identification signals from the reader 200. The reader 200 receives the identification signal from the plurality of antennas 301, 302, and 303, generates and transmits the received information as data, and the communication unit 110 receives the data.

Hereinafter, data on whether an identification signal is received by the plurality of antennas 301, 302, and 303 is referred to as sensing data. For example, information that the identification signal has been received by the first antenna 301 and that the identification signal has not been received by the second antenna 302 and the third antenna 303 may be included in the sensed data . A detailed description of the sensing data will be given later with reference to FIG.

The storage unit 120 stores an identification number table (not shown) and a detection table 500 and a data table 1200, which will be described later.

The identification number table is a table showing a correspondence relationship between the identification number and the identification number transmitting apparatus. The controller 130 refers to the identification number table to determine which identification number transmitting apparatus has approached the antenna unit 300 do. That is, the control unit 130 refers to the identification signal detected by the three antennas 301, 302, and 303, and confirms the identification signal transmitting apparatus that has transmitted the identification signal.

Here, it can be understood that the identification signal is detected by one or two of the three antennas 301, 302, and 303. That is, the three antennas 301, 302, and 303, each having a certain signal-receivable area, are arranged in a line. The identification signal transmitter may be included in a signal receivable area by one antenna, It can be included in the signal receivable area.

3 is a diagram illustrating an identification signal transmitting apparatus being detected by three antennas according to an embodiment of the present invention.

As shown, each of the antennas 301, 302, and 303 has its own signal receivable area, and the signal receivable area by adjacent antennas includes an overlap area. Since the three antennas 301, 302, and 303 are arranged in a line and the area where signals can be received by the first antenna 301 and the third antenna 303 is not overlapped, the first antenna 301 And the second antenna 302 or the overlapping area of the second antenna 302 and the third antenna 303 can be formed.

Therefore, when the identification signal transmitting apparatus is adjacent to the antenna unit 300, it can be included in a signal receivable area by each of the antennas 301, 302, and 303, or can be included in an overlap area of two adjacent antennas.

Fig. 3 shows that the identification signal transmitting apparatus included in the signal receivable area is indicated by a circle number.

The circle number 1 indicates the identification signal transmitting apparatus included in the area 310 where the signal can be received only by the first antenna 301. The circle number 2 indicates the first antenna 301 and the second antenna 302, Which is included in the area 320 where the signal can be received only by the second antenna 302, and the circle number 3 represents the identification signal transmission device included in the overlap area 315 in which the signal can be received by the second antenna 302, Circle number 4 denotes an identification signal transmitting apparatus included in the overlapping area 325 in which signals can be received by the second antenna 302 and the third antenna 303 and circle number 5 denotes a third antenna 303 in the area 330 capable of receiving signals only.

Hereinafter, the regions corresponding to circle numbers 1 to 5 are referred to as first to fifth regions 310, 320, 330, 340, and 350, respectively.

As described above, in the present invention, it is assumed that the identification signal transmitting apparatus moves on a path parallel to a straight line extending from the first antenna 301 to the third antenna 303. That is, the identification signal transmitting apparatus can move through the areas 310, 320, 330, 340, and 350 of FIG.

Therefore, the identification signal transmitting apparatus which is going to move from the first area 310 to the fifth area 350 can not move without passing through the third area 330.

Likewise, the identification signal transmitting apparatus can not preferentially enter the third area 330 without entering the first area 310 and the fifth area 350.

Referring again to FIG. 2, the control unit 130 can determine the moving direction of the identification signal transmitting apparatus by referring to the detection pattern of the identification signal. Here, it can be understood that the sensing pattern of the sensed identification signal means a temporal change with respect to sensed data composed of whether or not the identification signals for the three antennas 301, 302, 303 are received.

The detection data is a state in which no identification signal is received by any one of the three antennas 301, 302, 303, a state in which the identification signal is received by one of the three antennas 301, 302, 303, And may include data indicating a state in which the identification signal is received by the two antennas.

For example, when the identification signal is received by the first antenna 301 and the identification signal is not received by the second antenna 302 and the third antenna 303, that is, 310, the sensing data may have a value of "1 0 0 ". The antenna in which the identification signal is detected is indicated as "1 ", and the antenna in which the identification signal is not detected is indicated as" 0 "

Similarly, when the identification signal is not received by the first antenna 301 and the identification signal is received by the second antenna 302 and the third antenna 303, the sensed data is the value of "0 1 1" Lt; / RTI >

Accordingly, when the sensed data changes from "1 0 0" to "1 1 0" to "0 1 0" according to the passage of time, the control unit 130 determines that the identification signal transmitting apparatus is in the first area 310 ) - > second area 320 - > third area 330. [

Also, the controller 130 may determine an antenna that does not perform operation among the three antennas 301, 302, and 303 by referring to the detection pattern of the detected identification signal. In other words, the control unit 130 determines which of the three antennas 301, 302, and 303 does not perform the operation using the normally operating antenna according to the redundancy operation of the antenna unit 300.

For example, when the sensed data changes from "0 0 0" to "0 1 0" to "0 1 1" according to the passage of time, the control unit 130 determines that the first antenna 301 is normally It can be judged that it is not operating. When the detection data is "0 0 0", it means that the identification signal is not detected by any of the antennas. It is detected as "0 1 0" -> "0 1 1" immediately after "0 0 0" The fact that the data has changed means that it can be determined that the first antenna 301 is not operating.

The determination of whether or not the antenna is operated can be performed not only by a detection pattern of the identification signal but also through transmission and reception of a message. For this, the message management unit 140 periodically generates a request message according to a control command of the control unit 130, reads the response message received from the antenna unit 300, and transmits the response message to the control unit 130.

The request message is transmitted through the communication unit 110 and transmitted to each of the antennas 301, 302 and 303 via the reader 200. The antenna receiving the request message transmits a response message in response to the request message. The response message is received by the communication unit 110 through the transmission path of the request message.

Meanwhile, the antenna that can not normally perform the operation may not transmit the response message, and the controller 130 may determine whether the antenna is operating by referring to whether the response message is received.

In addition, the antenna receiving the request message can transmit its own operation state by including it in the response message, and the controller 130 can determine whether the antenna is operated by referring to the response message. For example, the antenna can transmit a response message indicating that the transmission / reception operation of the message can be performed, but that the transmission / reception operation of the wireless signal is impossible.

The output unit 150 outputs the determination result of the controller 130. [ That is, it outputs information on at least one of the identification signal transmitting apparatus approaching the antenna unit 300, the moving direction of the identification signal transmitting apparatus, and the antenna not performing the operation.

The output unit 150 may include at least one of a video output unit (not shown) and a voice output unit (not shown). The control unit 130 may output the video or audio information. have.

FIG. 4 illustrates a sensing frame according to an embodiment of the present invention. The sensing frame 400 refers to a frame transmitted by the antennas 301, 302, and 303 to the reader 200. The antennas 301, 302, and 303 may periodically transmit the sensing frame 400 or transmit the sensing frame 400 when the identification signal is received.

The detection frame 400 includes a frame start field 410, an antenna identification information field 420, a detection flag field 430, and a frame end field 440.

The frame start field 410 may include information indicating that the detection frame 400 is started. Through this, the reader 200 can recognize that the frame is the detection frame 400 and start reading the subsequent information.

The antenna identification information field 420 may include identification information of an antenna that transmits the detection frame 400. [ Accordingly, the reader 200 can recognize which one of the three antennas 301, 302, and 303 has transmitted the detection frame 400.

The detection flag field 430 may include information as to whether or not an identification signal has been received. For example, a flag of "1" may be included when an identification signal is received, and a flag of "0" may be included if an identification signal is not received.

When the sensing frame 400 is periodically transmitted, each of the antennas 301, 302, and 303 must include the identification signal in the sensing frame 400. On the other hand, when only the antenna receiving the identification signal transmits the detection frame, the detection flag field 430 may be omitted. It is possible to determine whether or not the identification signal is received only by transmitting the detection frame.

The frame last field 440 may include information indicating that the detection frame 400 is the last.

FIG. 5 illustrates a detection table according to an embodiment of the present invention. The detection table 500 includes detection data 510 and a sensing state 520.

The detection data 510 includes combinations of flags indicating whether or not the identification signals for the antennas 301, 302, and 303 are received. Since the description has been described above, detailed description thereof will be omitted here.

The sensing state 520 indicates the meaning of the sensing data 510. For example, when the detection data is "1 0 0 ", it means that the identification signal is detected only by the first antenna 301.

The control unit 130 can determine whether an identification signal is detected by an antenna using the detection table 500.

6 to 7 are views showing a detection pattern according to an embodiment of the present invention, in which all antennas included in the antenna unit 300 are normally operating.

The first half of FIGS. 6 and 7 show that the sensed data changes from "0 0 0" to "1 0 0" to "1 1 0" -> "0 1 0" The identification signal is detected by the first antenna 301 and then the identification signal is detected by the first antenna 301 and the second antenna 302, It means that the identification signal is detected by the antenna 302.

6 and 7, the control unit 130 can confirm that the identification signal transmitting apparatus has appeared on the first antenna 301 side and moved to the second antenna 302 side through the change of the sensing data .

The second half of FIG. 6 shows that the sensing data is changed from "0 1 0" to "0 1 1" -> "0 0 1" -> "0 0 0" 302, then an identification signal is sensed by the second antenna 302 and the third antenna 303, then an identification signal is sensed by the third antenna 303, and then any antenna It means that the identification signal is not detected.

That is, the control unit 130 can confirm that the identification signal transmitting apparatus has moved from the second antenna 302 side to the third antenna 303 side through the change of the sensing data shown in the latter half of FIG.

6, the control unit 130 confirms that the identification signal transmitting apparatus has appeared on the first antenna 301 side and has moved to the third antenna 303 side through the second antenna 302. That is, .

The second half of FIG. 7 shows that the sensing data is changed from "0 1 0" to "1 1 0" -> "1 0 0" -> "0 0 0" The identification signal is sensed by the first antenna 301 and then the identification signal is sensed by the first antenna 301 and the second antenna 302 and then the identification signal is sensed by the first antenna 301, It means that the identification signal is not detected.

That is, the control unit 130 can confirm that the identification signal transmitting apparatus has moved from the second antenna 302 side to the first antenna 301 side through the change of the sensing data shown in the latter half of FIG.

7, the control unit 130 moves from the first antenna 301 side to the second antenna 302 and then returns to the first antenna 301, As shown in FIG.

FIGS. 8 to 11 are diagrams illustrating a detection pattern according to another embodiment of the present invention, in which one of the antennas 301, 302, and 303 included in the antenna unit 300 does not operate.

The first half of FIG. 8 shows that the sensed data changes from "0 0 0" to "0 1 0", which can not be understood as a normal sensing pattern. As described above, the identification signal transmitting apparatus should preferentially enter the first area 310 or the fifth area 350, and the sensing pattern shown in the first half of FIG. 8 may include the first area 310 or the fifth area 350, It is interpreted that it firstly enters the third region 330 without entering the third region 350.

Therefore, in this case, it can be understood that the first antenna 301 or the third antenna 303 does not operate normally.

On the other hand, the third to fifth sensing data in FIG. 8 indicate that "0 1 1" -> "0 0 1" -> "0 0 0", indicating that the third antenna 303 operates normally . As a result, the controller 130 determines that the first antenna 301 is not operating normally, and confirms that the identification signal transmitting apparatus has appeared on the first antenna 301 side and moved to the second antenna 302 side .

9 shows that the sensed data changes from "0 0 0" to "X 0 0" to "X 1 0" where "X" is not "0" or "1" Means a number. That is, a number other than "0" or "1" is received from the first antenna 301.

9 shows that the first sensing data indicates "0 0 0" and thereafter the sensing data "X 0 0" is generated because the first antenna 301 receives the identification signal Quot; X "is transmitted when a value of" 0 "is transmitted and an identification signal is received.

Therefore, when the value of "X" other than "1" is received, the control unit 130 can consider that the identification signal is received and determine the moving direction of the identification signal transmitting apparatus.

9, the control unit 130 confirms that the identification signal transmitting apparatus has appeared on the first antenna 301 side and has moved to the third antenna 303 side through the second antenna 302 And it is possible to confirm that the detection frame generating means (not shown) of the first antenna 301 does not operate normally.

10 shows that the sensed data is changed from "0 0 0" to "1 0 0" -> "0 0 1" -> "0 0 0", which can not be understood as a normal sensing pattern . As described above, the identification signal transmitting apparatus, which is intended to move from the first region 310 to the fifth region 350, can not move without passing through the third region 330, 3 region 330 without passing through the first region 310 and the fifth region 350, respectively.

Therefore, in this case, it can be understood that the second antenna 302 does not operate normally. As a result, the controller 130 determines that the second antenna 302 is not operating normally, and confirms that the identification signal transmitting apparatus has appeared on the first antenna 301 side and moved to the third antenna 303 side .

11 shows that the sensed data changes from "0 0 0" to "1 0 0" -> "1 X 0" -> "0 X 0", where "X" Quot; or "1 ". That is, a number other than "0" or "1" is received from the second antenna 302.

On the other hand, the first and second detection data in FIG. 11 indicate that "0 0 0" and "1 0 0" respectively, and thereafter the detection data "1 X 0" is generated. Quot; X "when the antenna 302 transmits a value of" 0 " when it does not receive the identification signal and receives the identification signal.

Therefore, when the value of "X" other than "1" is received, the control unit 130 can consider that the identification signal is received and determine the moving direction of the identification signal transmitting apparatus.

11, the control unit 130 confirms that the identification signal transmitting apparatus has appeared on the first antenna 301 side and has moved to the third antenna 303 side via the second antenna 302 And it is possible to confirm that the detection frame generating means (not shown) of the second antenna 302 does not operate normally.

FIG. 12 shows a data table according to an embodiment of the present invention. The data table 1200 includes a detected data change item 1210, a faulty antenna item 1220, and a route item 1230.

In the detection data change item 1210, a change process of the sensed data, that is, a detection pattern is specified, and an antenna judged to be not normally operating normally is specified in the faulty antenna item 1220. In the movement path item 1230, The movement path of the device is specified.

The data table 1200 can be used to determine the direction of movement of antennas and identification signal transmitting apparatuses that do not operate normally if one of the three antennas 301, 302, and 303 is not operating normally.

The control unit 130 refers to the data table 1200 to check the movement path of the antennas and the identification signal transmitting apparatus that are not operating normally. When the change of data is included, it is possible to determine which antenna has failed and the movement path of the identification signal transmitting apparatus.

For example, when the detection data changes from "0 0 0" to "0 1 0" to "0 1 1", the controller 130 does not normally operate the first antenna 301, It can be determined that the transmitting apparatus has moved from the first area 310 to the second area 320 to the third area 330 to the fourth area 340.

When the detection data changes from "0 0 0" to "0 1 0" to "1 10 0", the controller 130 does not normally operate the third antenna 303, The fourth region 340, the third region 330, and the second region 320 in the fifth region 350, the fourth region 340, the third region 330, and the second region 320, respectively.

Accordingly, after it is determined that any antenna does not operate normally, the control unit 130 can determine the movement path of the identification signal transmitting apparatus considering the sensing data by the remaining antennas without considering the sensing data by the corresponding antenna , And when the fault antenna is normally operated, the movement path of the ID signal transmitting apparatus can be determined in consideration of the sensing data of the entire antenna.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: Access control system 100: Data management device
200: reader 300: antenna part
110: communication unit 120: storage unit
130: control unit 140: message management unit
150:

Claims (6)

An antenna comprising: a plurality of antennas; And
And a control unit for identifying the identification signal transmitting apparatus that has transmitted the identification signal with reference to the identification signal detected by the plurality of antennas and determining the moving direction of the identification signal transmitting apparatus by referring to the detection pattern of the identification signal However,
Wherein the control unit determines an antenna that does not perform an operation among the plurality of antennas by referring to a detection pattern of the detected identification signal. The method according to claim 1,
Wherein the sensing pattern of the sensed identification signal includes a temporal change of sensed data constituted by whether or not the identification signal for each of the plurality of antennas is received. delete 3. The method of claim 2,
Wherein the detection data includes a state in which the identification signal is not received by any one of the plurality of antennas, a state in which the identification signal is received by one of the plurality of antennas, And a data indicating the received state. The method according to claim 1,
Wherein the identification signal includes an RFID (Radio Frequency Identification) signal. Identifying an identification signal transmitting apparatus that has transmitted the identification signal by referring to the identification signal detected by the plurality of antennas;
Confirming the identification signal transmitting apparatus by referring to the detected identification signal;
Determining a moving direction of the identification signal transmitting apparatus by referring to the detection pattern of the detected identification signal; And
And determining an antenna that does not operate among the plurality of antennas by referring to the detected pattern of the detected identification signal.

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