KR101172944B1 - A position identifier for providing underground facility information using RFID and magnetic substance - Google Patents

Abstract

The present invention relates to a location identifier installed on top of an underground buried material by combining an RFID antenna and a magnetic material. The present invention extends a recognition distance between an RFID tag and a reader period in a basement and a depth that the RFID reader cannot recognize is a magnetic field sent from the magnetic material. It can be detected through the magnetic sensor and provides accurate recognition information and location information of underground facilities and underground burials.

To this end, the present invention has a magnetic body in the center, and the surrounding surface is wound with a LF band (Low Frequency) antenna coil to combine magnetic fields to increase the magnetic field of the antenna, so that the antenna coil is not influenced by the RFID tag chip. Prepare the composition.

As a result, the recognition distance between the RFID tag and the reader of the electromagnetic induction method is widened, so that the usability is good and the depth is deep, so when the recognition is impossible, the magnetic sensor detects the position by using the magnetic field signal. It can be installed in underground underground works, and can provide safe work during road construction and maintenance according to various information.

Buried tags, RFID, magnetic identifiers, underground burial, underground burial

Description

A position identifier for providing underground facility information using RFID and magnetic substance}

The present invention relates to an identifier installed in an underground installation by combining an RFID antenna and a magnetic material. An underground tag identifier device having an RFID tag and a magnetic material communicating in a low frequency (LF) band to expand a recognition distance

In general, water supplies, sewerage, gas pipes, electric lines and various communication cables supplied to homes are buried underground to prevent breakage. However, roads with cables and pipes are often excavated due to various projects. In addition, when installing a new facility or constructing a building, the time and material cost of the construction may be increased because the location of the existing facility is not accurately understood, and in case of accidentally destroying the existing facility during construction, Not only loss, but also the safety of the operator is a great risk. Therefore, systems were designed to locate and manage the buried facilities to prevent damage to the cables and pipes buried during construction.

Among the systems for locating and managing the facilities installed in the underground, there is a system for locating the buried goods using RFID tags. This system places the passive or active RFID tag on the top of the underground facility, It accepts various information contained in RFID tag by using and displays and manages buried facilities using PDA, notebook, etc.

In the system to locate and manage the buried items using RFID tags, passive RFID tags have no power supply and are used permanently, while the recognition distance between RFID tags and reader period is short or the recognition rate is not good due to obstacles. Although the recognition distance is wide and the recognition rate of obstacles is good, the life of the power supply is too short (maximum of 5 years) compared to 30 years.

Accordingly, an object of the present invention is to provide a location identifier device incorporating an RFID tag that increases the recognition rate and widens the recognition distance by using an optimal LF band in consideration of underground embedding characteristics in a location detection system using an RFID tag. There is this.

In addition, if the depth of the buried depth of the reader is not recognized, the purpose is to provide a location identifier device incorporating a magnetic material to inform the location of the underground facilities by increasing the depth of the buried through the magnetic sensor and the accuracy of detection through the magnetic sensor .

According to the present invention, the above object is provided in the body, the RFID chip to communicate in the low frequency (LF) band, and the outer peripheral surface of the magnetic material is coupled to the RFID chip and the coil corresponding to the low frequency (LF) band It is achieved by having an antenna wound and formed by the length of.

Preferably it is bonded to one side of the magnetic material is embedded in the ground.

The RFID chip preferably stores data including the size, type, depth of embedding, location information, installation date, information of the person in charge, and the like.

The low frequency (LF) band is preferably in the range of 125 KHz to 150 KHz.

As described above, the present invention is installed on the top of the underground facility, the combination of the antenna and the magnetic material of the RFID tag to widen the recognition distance to check the detailed information immediately using a reader can be carried out accurately and efficiently during construction work .

In addition, since it is strong in underground environments with many variables due to obstacles such as water and stones, there is little risk of failure, and even in rain or snow environments, the operation is stopped or the risk of malfunction is low.

In addition, since the magnetic field formed by the magnetic material located inside the body may be detected by the magnetic sensor of the reader, the embedded underground facility may be sensed for the distance that the RFID tag does not recognize, thereby efficiently managing the facility.

The present invention is implemented by winding as many antennas as needed in the magnetic material and the LF band around the RFID chip of the LF band and the magnetic material to increase the recognition distance in the detection of underground facilities.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram illustrating a buried land identifier device including an RFID tag communicating in an LF band on a surface around a magnetic material according to the present invention.

The buried material identifier device includes a body 310, a magnetic body 320, an RFID chip 330, and an antenna 340.

Body 310 is to be made strong and waterproof and flameproof, use, company name, product number, etc. are displayed, and the magnetic material 320 is placed inside the ground to be stably positioned.

The RFID tag is composed of an RFID chip 330 and an antenna 340, the RFID chip 330 is attached to any one of the upper end of the body or inside the body. In addition, the RFID chip 330 has a unique number. The unique number is not changed or deleted. The RFID chip 330 includes a memory 720 in which information of the buried material is stored. This memory includes the size, type, depth of burial, location information, installation date, and the person in charge of the deposit.

The memory of the RFID chip 330 must take security measures so that the detailed information of the buried material can be encrypted so that no one can read it and no one can modify it. This is to prevent the information from being erased or distorted.

In addition, the RFID chip 330 is an active type that requires its own power source and a passive type that does not require its own power source.In the case of underground buried materials, the life of the battery requires more than 30 years, so the battery life is short and external. In the underground buried land identifier identifier is difficult to supply power to the ground, it is better to be passive because it provides the information of the buried material through the reader only when necessary.

The RFID tag transmits information of a memory embedded in the RFID chip 330 to a reader, and a communication frequency with the reader uses an LF band (125KHz to 150KHz). In order for the RFID tag to communicate with the reader through the LF frequency band, an antenna having a length corresponding to the LF frequency band is required.

The required antenna length is 2, 1, 1/2, and 1/4 wavelengths for general antennas. The LF band RFID tag uses only magnetic waves of electromagnetic waves, so it is efficient to obtain power with loop antenna. Since the antenna is manufactured with a loop antenna, the antenna 340 is determined in relation to the length of the wavelength. For example, when the length of the wavelength is 125KHz, λ = f / c, the antenna length should be 2400m, but since there is a capacitor value inside the tag, the antenna efficiency must be set to 125KHz for the antenna efficiency to obtain the maximum gain. As a result, the resonance frequency is determined by multiplying the internal parallel capacitor value and the loop coil value, thereby calculating the antenna length. That is, the larger the value of the internal capacitor, the smaller the length of the loop coil. This can be achieved by adding parallel capacitors to reduce the length of the antenna coil.

The antenna 340 is formed by winding along the outer circumferential surface of the magnetic body 320. The length of the antenna is determined by the communication frequency of the RFID tag and the reader, and the antenna 340 is formed by winding a coil having a length determined according to the communication frequency on the magnetic material.

Commonly used bands such as HF and UHF of RFID are almost impossible to use in the ground. Antennas of HF and UHF bands have short antennas and are greatly affected by permittivity. In an environment where there are various obstacles such as water and stone, the underground identifier device is easily damaged and is likely to fail. In addition, even when it is rained or snowed due to the influence of the weather, it is difficult to transmit or receive a signal stably due to the stop operation or malfunction.

Therefore, by using the LF band that is less influenced by various obstacles such as the ground and also strong in the external environment, the buried property identifier device has stability.

Since the antenna 340 is wrapped along the outer circumferential surface of the magnetic body 320, it is possible to secure as much length as necessary in the LF band. And the magnetic body 320 is preferably a magnetic material having a frequency characteristic of the LF band. The magnetic body is composed of a circular antenna type wound coil.

The magnetic body 320 is preferably an anisotropic ferrite magnet (anisotropic ferrite magnet), since the earth always has an earth magnetic field, the magnitude of the magnetic field enough to be recognized as a singularity by changing the flow of the earth magnetic field (0.3 to 0.6 Gauss) ( 1,600 ~ 2,000 Gauss).

The magnetic body 320 is coupled to the antenna coil to form an electromagnetic field. The electric field generated from the antenna coil is around the electrostatic charge, and the magnetic field from the magnetic body is generated around the magnetic pole. Where the electric field fluctuates in time, electric charges move and a magnetic field is generated. On the contrary, when the electric field fluctuates, the electric field is accompanied.

In addition, the relationship between the electric field from the antenna coil and the magnetic field from the magnetic body is connected by Maxwell's equation, so that a change in one field leads to a change in the other field.

4 is a view illustrating a body that allows the magnetic material 320 and the RFID tag 330 to be disposed.

The upper end 410 and the lower end 430 of the body are for protecting the magnetic body 320 and the RFID tag 330 from external shock, pressure, and moisture, and the interior 420 of the body has a magnetic body 320 and an RFID tag. The position of the 330 and the antenna 340 is provided to mitigate the impact, and is made of a plastic resin product having little property change with temperature and excellent durability and waterproofness.

The upper end portion 410 of the body has a curved structure to display the N polarity of the magnetic field, and the upper surface to indicate the direction, type, specification, etc. of the buried material.

The interior 420 of the body is provided so that the magnetic body is located in the center with the peripheral protrusions so as not to inconvenience the coil of the antenna 340 is wound along the outer circumferential surface.

The lower end portion 430 of the body is different in shape depending on the type of buried material to make the adhesion easily by using a horizontal adhesive and the molding is possible.

8 is a conceptual diagram in which an electric field 510 of an RFID antenna coil and a magnetic field 520 of a magnetic body are combined to form an electromagnetic field 530. The electromagnetic field 530 is composed of the electric field 510 and the magnetic field 520 by Faraday's law, and the widened electromagnetic field 530 widens the area of electromagnetic induction to widen the recognition distance of the RFID tag.

9 is a view showing information of the buried material displayed on the upper surface of the upper end portion 410 of the underground buried object identifier device according to the present invention. The format displayed on the upper part is indicated as unidirectional buried cover 610, right branch buried cover 620, left branch buried cover 630, etc. It should be limited to the direction, type, size, standard, information of responsible person, etc.

10 is a block diagram of an RFID tag composed of an RFID chip and an antenna.

The RFID tag is composed of a transceiver 710 and a tag 720.

The transceiver 710 is divided into a radio frequency (RF) 711 and an antenna 712, and is converted into a radio frequency 711 and transmitted and received through the antenna 712.

The tag 720 is divided into a front-end analog part 721, a digital part 722, and a memory part 723, and the data from the transceiver 710 is stored. The analog amplification unit 721 extracts and converts the data into the memory unit 723 through the digital unit 722, and extracts the data to be transmitted and received to the reader.

The analog amplification unit 721 is composed of unit blocks such as a demodulator, a modulator, and a power generator, and generates power, extracts transmitted data, and transmits data to be transmitted.

The digital unit 722 is composed of unit blocks such as a power on reset, a clock generator, and a controller. The digital unit 722 synchronizes clock generation, extracted data with a clock, and controls the memory unit 723 by a command received from a reader.

The memory unit 723 is composed of an EEPROM (Electrically Erasable and Programmable ROM) and a boost circuit, and stores, reads, and erases data. This pyrom again stores the unique number of RFID tag and buried information. The unique number is easy to distinguish from other buried identifier devices and is not changed or deleted by any system. In addition, the buried information includes buried type, size, location information, date, and information of a buried institution.

11 is an overall configuration diagram showing the overall structure of the underground buried material display system.

The buried material 830 is buried in the ground, and the buried material identifier device 820 for notifying that the buried material 830 is buried is provided.

The underground buried material identifier device 820 containing the information about the buried material 830 transmits and receives a radio signal or a magnetic signal with the reader 810 through a magnetic sensor.

The reader 810 is an antenna of the buried land identifier device 820, a transceiver for communicating with an RFID tag consisting of an RFID chip, a controller unit for controlling the RFID tag, a magnetic signal of a magnetic material of the buried land identifier device 820 LCD player showing the magnetic sensor to be detected, RFID tag information data, magnetic field component data captured by magnetic sensor, central processing unit to process information received from GPS satellite 860, GPS receiver, map data and other information And a mobile communication interface for communicating with a server 850 such as a host computer.

The underground embedding identifier device 820 containing the information on the buried material 830 primarily transmits and receives with the reader 810 through a radio frequency. Secondly, when the depth of the buried material is not deep enough to recognize the RFID tag, it receives the magnetic signal of the magnetic body 320 through the magnetic sensor installed in the reader 810 and converts the magnetic signal into digital magnetic field data and attaches it to the top of the reader 810. The LCD player can display various data such as various values and graphs, and can receive the current location of the buried property identifier device 820 in conjunction with the GPS satellite 860. Received location information is recorded and stored through the central processing unit.

Information of the buried material 830 transmitted and received through the reader 810 is decoded by the server 850 through the mobile communication network 840 and provided to the user.

The server 850 may identify a plurality of buried property identifier devices 820 based on information retrieved from the reader 810, or may search for a buried property identifier device 820 stored in a database of the server 850.

In addition, when the reader 810 is a PDA, a notebook, and a PC including an RFID function, the reader 810 may take the role of the server 850.

The server 850 further includes a database in which information of all underground buried identifier devices 820 buried in the ground is stored, and a unique number in which the unique number of each underground buried identifier device 820 is stored in the database. A management module, a buried goods information management module in which buried goods information of each underground buried identifier device 820 is stored, a reader for transmitting and receiving to a location coordinate management module and a buried goods identifier device 820 in which position coordinates of each buried buried goods identifier device 820 are stored. A reader management module for managing the information of 810 is included.

 The overall structure of the underground buried material management system is received from the underground buried identifier device 820 attached to the top of the buried material 830 through the reader 810 to receive the information of the RFID tag or receive a magnetic signal to the position coordinates from the GPS satellite 860 Based on the received information, the mobile communication network 840 is connected with the server 850 to acquire the information on the buried material 830 to facilitate the construction or maintenance.

1 is a view showing the exterior of a conventional underground identifier device embedded with a RFID tag,

2 is a view showing the inside of a buried land identifier device embedded with a conventional RFID tag,

3 is a perspective view showing a buried land identifier device embedded with an RFID tag to communicate in the LF band according to the present invention,

Figure 4 is a cross-sectional view showing the body (frame) of the buried ground identifier device according to the present invention,

Figure 5 is a plan view showing a buried land identifier device according to the present invention,

6 is a side view showing a buried land identifier device according to the present invention,

7 is a cross-sectional view showing a buried land identifier device according to the present invention,

8 is a conceptual diagram of forming an electromagnetic field by combining a magnetic field of a magnetic material and an electric field of an RFID antenna coil;

9 is a view showing the information of the buried material displayed on the upper surface of the upper portion of the buried ground identifier device according to the present invention,

10 is a block diagram of an RFID tag consisting of an RFID chip and an antenna;

11 is an overall configuration diagram showing the overall structure of the underground buried material management system.

* Description of the symbols for the main parts of the drawings *

310: body 320: magnetic material

330: RFID chip 340: antenna

410: upper portion of the body 420: the inside of the body

430: lower part of the body

510: electric field of the antenna coil

520: magnetic field of the magnetic material

530: electromagnetic field

610: one-way buried goods display 620: right branch buried goods display

630: left buried display

710: RF transmission and reception 711: radio frequency

712 antenna

720: tag 721: analog amplification unit

721: digital part 723: memory part

810: reader 820: underground buried material identifier device according to the present invention

830: buried material 840: mobile network repeater

850: Server 860: GPS satellites

Claims (6)

 The landfill identifier device comprising a coating material made of a resin material surface-treated for waterproofing and moisture proofing over the entire surface,  The upper portion of the underground buried identifier device has a curved structure to indicate the polarity of the magnetic field.  The direction, type, standard, etc. of the buried material are displayed on the upper surface of the upper portion of the underground buried identifier device,  The upper end portion of the buried ground identifier device is characterized in that for displaying the N pole,  Fixing the RFID tag on the upper end of the underground buried identifier device,  The inside of the underground buried identifier device is provided to place a magnetic material in the center,  The tag antenna coil is wound around the inner periphery of the underground deposit identifier device,  The lower end portion of the underground buried identifier device is adhesively provided to be attached to another structure,  A landfill identifier device provided with a flat structure at a lower end of the landfill identifier device to maintain an equilibrium. delete delete delete delete delete

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