KR101017767B1 - RTLS Tag Device - Google Patents

Abstract

The present invention relates to a location recognition system, and more particularly, to a Real Time Locating System (RTLS) based on a wireless LAN such as Wi-Fi and applying a wireless positioning technology, which is a core technology for determining a location.

RTLS tag device of the present invention, a wireless communication unit for forming a wireless communication channel with a wireless Internet base station; And calculating reception sensitivity of each beacon signal transmitted from at least three different wireless Internet base stations, and for each of the beacon signals, information including the reception sensitivity and an identification symbol of the base station transmitting the information. It characterized in that it comprises a control unit for transmitting to the formed wireless Internet base station.

RTLS, location awareness, wifi, tag device, wi-fi

Description

RTLS Tag Device

The present invention relates to a RTLS tag device that can be used in a location recognition system, and in particular, based on a wireless LAN, such as Wi-Fi, and Real Time Locating System using a radio positioning technology that is a core technology for determining a location RTLS tag device that can be used).

In the RTLS tag device of the present invention, in determining a location using a wireless communication network, a location of a wireless communication access point (AP) constituting a wireless LAN infrastructure is selected and understood, and the received signal received by the terminal from the access point (AP). The distance information is obtained by using the sensitivity of the signals, and can be used in RTLS to apply a positioning algorithm using the information.

Location-based service (LBS) is a location-based service that combines personalization and mobility, which is a characteristic of the wireless Internet, and uses location information-based systems and services that collectively utilize mobile communication networks such as mobile phones and PDAs and IT technologies. Say.

The service is based on the customer's location information of the convenience of life (logistics, services of convenience, telephone number service, local information), commerce information (providing services such as notification of the desired product, location-based marketing / advertising, etc.), Traffic information (driving review information, public transit route search and setting) and location tracking information (location tracking, personal location information, lost terminal tracking) can be used to provide a variety of information throughout life.

In the location-based service, a method of recognizing a location of a movable target is performed. In order to recognize the position of the object that can be moved, a fixed object that is a reference for position determination is required. In the current location recognition method, a stationary satellite or a beacon signal transmitter for location recognition is used as a fixed object as a reference for location determination.

It is an object of the present invention to provide an RTLS tag device that can be used to construct an inexpensive location-aware system without the additional cost of having a fixed facility on which to determine location.

It is another object of the present invention to provide an RTLS tag device that can be used to construct a location recognition system that can secure sufficient precision while being less affected by terrain.

Another object of the present invention is to provide an inexpensive RTLS tag device which can be conveniently used in a vehicle.

RTLS tag device of the present invention for achieving the above object, the wireless communication unit for forming a wireless communication channel with a wireless Internet base station, measuring the acceleration of the RTLS (Real Time Locating System) tag device at a predetermined period to output the acceleration information Calculate the reception sensitivity of the beacon signal transmitted from the acceleration module and at least three different wireless Internet base stations, and receive information from the acceleration module and information including the reception sensitivity corresponding to each beacon signal and the identification symbol of the base station. And a control unit for transmitting the acceleration information to a wireless internet base station having a wireless communication channel.

When implementing the RTLS tag device of the present invention according to the above configuration, there is an advantage that can reduce the additional cost for having a separate fixed equipment that is the basis of the position determination.

1 illustrates an infrastructure component of a location based service system using GPS.

The Location-Based Service Platform (LBSP) is a platform that provides the most basic and core functions for LBS, and provides a common component that facilitates the development of various location-based services. In detail, external LBS application service client location request processing, interworking with the location-related system (base station or GPS location acquisition server) in the mobile communication network, primary processing (location transformation or Reverse-Geocoding, etc.) of the location information obtained from the location acquisition server, Location information management and spatio-temporal function support are provided.

The Mobile Positioning Center (MPC) is a server that serves as an element for retrieving, transmitting, storing, and controlling location data in a location information providing network infrastructure. GISP (Geographic Information Service Platform) is a GIS platform or content server that provides contents such as electronic maps, POIs, and traffic information for LBS services.

AS (Application Server) / SP (Service Provider) is an LBS application service providing server or an LBS client / service provider that provides LBS supplementary application services based on location information or GIS content provided by LBSP or GISP.

CP (Contents Provider) is a source provider of electronic maps, POIs, road network information, etc. mounted in GISP, and provides additional contents such as real-time traffic information, weather information, merchant information, and representative POIs.

Positioning Determining Entity (PDE) is an element that determines the precise location or geographic location of a wireless terminal when a mobile terminal user initiates or talks. All PDEs provide one or more positioning techniques.

The main advantage of the location-based service system shown is that wireless Internet users do not have to enter addresses or area separators while moving multiple locations, and GPS positioning technology enables this to facilitate access to wireless Internet services. Is one of the techniques. In addition, as the LBS system is gradually developed, it is being developed as a system that uses a combination of the GPS method and the Cell-ID method.

The Cell-ID method uses a mobile communication base station to locate a user within a 500 ~ 1500m error range around a base station connected to a subscriber. Therefore, while the location of the building and the underground can be found using a repeater, etc., the disadvantage is that the error range is wide and only the approximate location can be determined.

GPS method can find the exact position within 10 ~ 150m error because satellite finds GPS chip accurately, so it can track the location more precisely than Cell method. However, due to the nature of the satellite signal, it cannot be used indoors and is reflected in buildings. Due to its good refraction, it is vulnerable to high-rise buildings.

Therefore, when looking at the problem of the LBS system of Figure 1, it is difficult to use in a poor communication environment, such as the indoor state. In addition, the error of positioning can be reduced from 10m to 50m by using a mobile phone with GPS, but the reception is inferior to the base station method. In addition, since it takes two to three minutes to receive the initial information, commercialization has many difficulties.

And base station, various management server, home location register, exchange, etc. must be separately installed, and the transmission and management system through this is complicated. This increases the separate installation space and the associated costs.

In the present invention, based on the Wi-Fi WLAN, RTLS (Real Time Locating System) was implemented by applying a wireless positioning technology that is a core technology for determining the location.

In the present invention, in positioning and tracking using a wireless communication network, the location of the access point (AP) is selected and identified as a wireless communication transmitter, and the mobile terminal uses the received signal received from the access point (AP). RTLS can be obtained by obtaining the distance information and applying the information to a predetermined positioning algorithm. In this case, it is preferable to apply 802.11b among 802.11 established by IEEE as a standard WLAN protocol.

First, the Wi-Fi system that can be applied to the location-based service according to the present invention will be discussed.

The contents of the IEEE 802.11b standard fall into two broad categories. One is related to authentication of WLAN and defines SSID (Service Set IDentifiers). The SSID refers to the network name of the device in the WLAN subsystem to perform initial access control. An AP (Access Point), which connects a wired LAN and a wireless terminal, broadcasts its SSID in a beacon signal periodically sent by itself.

The other is that of security, it defines WEP. WEP is an encryption scheme defined to provide security of WLAN data streams in IEEE 802.11b, and is a symmetric structure using the same key and algorithm for encrypting and decrypting data. The purpose of the WEP is to provide access control and confidentiality, allowing only users with the correct WEP key to access the network and decrypting the data stream.

The operation mode of 802.11b can be classified into two types: infrastructure WLAN (client / server method) and ad-hoc peer-to-peer method (WLAN). The present invention is more preferably applied to infrastructure WLAN. Do.

Infrastructure WLAN is a structure including AP, a control terminal for managing registration and media access of terminals belonging to a communication network and supporting communication with other communication networks. It also supports medium access control (MAC).

Each mobile terminal used in the wireless LAN system includes a wireless LAN card, which provides a transparent connection to a network by performing an interface function between a network operating system (NOS) and an antenna in a wireless LAN environment.

The access points (APs) are LAN hubs in a wireless environment. For example, it is connected to a backbone of a wired network through a standard Ethernet cable to communicate with RTLS terminals (or tags) through an antenna. The radius of the AP ranges from 30 to 1000m, and one AP supports dozens or hundreds of RTLS terminals depending on the technology, configuration and usage. It also tracks the movement of RTLS terminals within its own area and may approve or reject communication of specific RTLS terminals. Recently, APs that combine router functions or support high-speed Internet connections such as ADSL and Cable Modem have also been released.

The RTLS tag device according to the spirit of the present invention is used in conjunction with a wireless Internet infrastructure. The RTLS tag device transmits information on which the RTLS server, which can be connected through the wireless Internet, based on its location.

In order to minimize the manufacturing cost of the RTLS tag device, it is preferable to implement only the function of collecting and transmitting the location-based basis information (eg, reception sensitivity values of beacon signals broadcasted by the AP).

2 illustrates an embodiment of an RTLS tag device according to the spirit of the present invention.

The illustrated RTLS tag device includes: a main processor 10 for collecting and transmitting location-based evidence in accordance with the spirit of the present invention; And antennas (wi-fi communication antennas) 20 and 21 for detecting and / or transmitting a wireless signal to the wireless Internet base station.

As shown, the main processor 10 includes, as an internal component, a wireless communication module for establishing a wireless communication channel with a wireless Internet base station; A reception sensitivity calculation module for calculating a reception sensitivity of each beacon signal transmitted from at least three different wireless Internet base stations; And an operation control module for transmitting the information including the reception sensitivity and the identification symbol of the base station to which the beacon signal is transmitted to the wireless Internet base station in which the wireless communication channel is formed.

The illustrated RTLS tag device includes two wi-fi communication antennas 20 and 21 and connectors 25 and 26, but may be provided with one antenna or three or more antennas, depending on the implementation.

When only one wi-fi communication antenna is provided, the illustrated switching block 30 can be appropriately controlled to time-divisionally control the operation of the antenna into a reception operation and a transmission operation.

When two or more wi-fi communication antennas are provided, the antennas may be divided into a receiving antenna and a transmitting antenna, respectively, or may be applied in a diversity structure through the switch block 30 to cover a wider position, or different APs. It can be applied to receive a signal for.

The main processor 10 performs a function of forming the wi-fi communication channel, a function of measuring reception sensitivity of the beacon signal, and packaging information including the reception sensitivity and an identification symbol of the base station. It may be a single processor. That is, the main processor 10 performs an operation of packaging the information including the reception sensitivity and the identification symbol of the base station as a receiver using an RTLS server existing on the Internet as a receiver. Can be. For example, the main processor 10 may be a one-chip solution incorporating an 802.11b MAC terminal and a 2.45 GHz RF block.

In the case of using a one-chip type device, since the output power of the main processor 10 may be insufficient, the PA 46 may be provided for additional transmission output. In addition, it is preferable to include band pass filters (BPFs) 42 and 44 in the Rx path and / or the Tx path. For example, bandpass filters (BPFs) 42 and 44 for 2.45 GHz WLANs can be placed in both transmit and receive paths to remove out-of-band components.

For various applications executed using the RTLS terminal in the RTLS terminal, at the position of the block shown by the sensor unit 54, a temperature sensor, a movement sensor (Tilt / Vibration Sensor), a button (for example, a Push Button) or a magnetic It can be implemented to have a device having a coil (Magnetic Coil) function.

In addition, various user interfaces 56 may be provided to support the various applications, and additional memory 52 may be further provided to support applications requiring a large memory capacity.

3 illustrates another embodiment of an RTLS tag device according to the spirit of the present invention.

The RTLS tag device shown in FIG. 2 is similar to the tag device of FIG. 2, and includes a main processor 10, a switch block 30, a plurality of wi-fi antennas 20 and 21, an RF connector 25 and 26, and a BPF. 42, 44, and PA 46, and, upon request, may further include a user interface 56, a sensor block 54, and additional memory 52. Since the components are almost the same as those of FIG. 2, detailed descriptions thereof will be omitted.

Meanwhile, the illustrated RTLS tag device may further include a logic gate 48 that controls the switch block by adjusting a control signal output from the main processor 10. The logic gate 48, as a commercial processor, serves to mediate control signals when an output signal (control signal) of the main processor and a control signal input to the switch block do not coincide in terms of the number or signal format. Do this.

Meanwhile, the illustrated RTLS tag device is a power supply for supplying driving power for the main processor 10, the logic gate 48, and the PA 46, and adjusts the power input from the cigar jack 62 of the vehicle. Thus, there is a difference from the tag device of FIG. 2 in that the regulator 64 is provided to the main processor 10, the logic gate 48, and the PA 46.

The regulator 64 may convert a power input at 12V into a 3V power supply, supply the power to the main processor and the PA, and include a zener diode for surge absorption.

4 illustrates another embodiment of an RTLS tag device according to the spirit of the present invention.

The RTLS tag device shown in FIG. 3 is the main processor 10, the switch block 30, the plurality of wi-fi antennas 20 and 21, the RF connectors 25 and 26, and the BPF, similarly to the tag device of FIG. 3. 42, 44, PA 46, and regulator 64, and, upon request, may further include a user interface 56, a sensor block 54, and additional memory 52. Since the components are almost the same as those of FIG. 2 or 3, detailed descriptions thereof will be omitted.

In addition, the illustrated RTLS tag device further includes a GPS module 92 that receives a GPS signal transmitted from a GPS satellite, extracts GPS information from the GPS signal, and transmits the GPS information to the main processor 10. It is different from the tag device of 3.

The GPS information may be location information of an RTLS tag or a signal from which the GPS signal is received. In the former case, the GPS module 92 performs calculation of position information from the GPS signal, and in the latter case, the main processor (in this case, the main processor further includes a calculation module for calculating position information from the GPS signal. Or the RTLS server that receives it.

In addition, the main processor 10 is configured to package the information including the GPS signal, the reception sensitivity, and the identification symbol of the base station as a receiver by using the RTLS server existing on the Internet as a receiver. You can perform the operation.

5 illustrates another embodiment of an RTLS tag device according to the spirit of the present invention.

The RTLS tag device shown in FIG. 3 is the main processor 10, the switch block 30, the plurality of wi-fi antennas 20 and 21, the RF connectors 25 and 26, and the BPF, similarly to the tag device of FIG. 3. 42, 44, PA 46, and regulator 64, and, upon request, may further include a user interface 56, a sensor block 54, and additional memory 52. Since the components are almost the same as those of FIG. 2 or 3, detailed descriptions thereof will be omitted.

Meanwhile, the illustrated RTLS tag device is different from the tag device of FIG. 3 in that it further includes an acceleration module 96 which measures the acceleration of the mobile terminal and transmits it to the main processor.

In general, the speed can be obtained by integrating the acceleration, the moving distance can be calculated by integrating the speed, and the position can be determined from the accumulated and recorded moving distance given the reference position. Preferably, the acceleration module 96 may measure two axes (or two axes forming plane coordinates parallel to the ground) or three axes of the mobile terminal at regular intervals.

The operation of determining the position of the RTLS tag based on the acceleration may be performed by the main processor 10 or may be performed by the RTLS server receiving the final transmission.

In the latter case, the main processor 10 conforms to the wi-fi communication protocol by using the information including the acceleration signal, the reception sensitivity, and the identification symbol of the base station as a receiver on an RTLS server existing on the Internet. Packaging may be performed.

6 to 9 illustrate various embodiments of different configurations of a power supply unit constituting an RTLS tag device according to the inventive concept.

The RTLS tag device of FIG. 6 is a power supply for supplying driving power for the main processor 10, the logic gate 48, and the PA 46, and is connected to the USB master device (connected via the USB connector 72). And a regulator 74 for receiving power from the RTLS tag device as a driving power source.

The regulator 74 converts a power input at 5V into a 3V power supply and supplies the power to the main processor 10, the logic gate 48, and the PA 46, and may include a circuit for surge absorption.

The RTLS tag device of FIG. 7 is a power supply for supplying driving power for the main processor 10, the logic gate 48, and the PA 46, and includes the main processor 10, the logic gate 48, and the PA ( A secondary battery for supplying driving power to the vehicle; And regulators / charge circuits 63 and 64 for charging the secondary battery by adjusting power input from the cigar jack 62 of the vehicle.

The regulator / charging circuits 63 and 64 convert the power input at 12V into a power source having a voltage suitable for charging the secondary battery and supply it to the secondary battery. Although the illustrated regulator / charge circuits 63 and 64 have built-in zener diodes for surge absorption, they may be omitted since the secondary battery performs some of the functions of surge absorption.

The RTLS tag device of FIG. 8 is a power supply for supplying driving power for the main processor 10, the logic gate 48, and the PA 46, and includes the main processor 10, the logic gate 48, and the PA ( A secondary battery for supplying driving power to the vehicle; And regulators / charge circuits 63 'and 64 for charging the secondary battery by adjusting power input from a cigar jack of a vehicle having various voltages. The illustrated regulator / charge circuits 63 'and 64 differ from the circuit of FIG. 6 by further including a cigar jack adapter circuit 62'. The adapter circuit 62 'adjusts the ratio of the voltage output to the charging circuit 63' to the voltage input from the cigar jack of the vehicle manually or automatically.

The RTLS tag device of FIG. 9 is a power supply for supplying driving power for the main processor 10, the logic gate 48, and the PA 46, and includes the main processor 10, the logic gate 48, and the PA ( 46, a battery 83 for supplying driving power.

Each of the RTLS tag devices shown in FIGS. 10A to 10B is a change of components of the tag devices of FIGS. 3 to 9 from each other. Therefore, the description of the components constituting the respective RTLS tag devices shown in FIGS. 10A to 10B are sufficiently inferred from the descriptions of FIGS. 3 to 9 and thus omitted.

Meanwhile, the Wi-Fi RTLS tag device is a requirement for a mobile terminal that performs the Internet, and it is desirable to minimize power consumption. If the location recognition method according to the spirit of the present invention is performed too frequently, the power consumption is increased, which leads to a decrease in battery life.

In order to prevent the above problem, a location recognition method of a method of adjusting the time point for performing location recognition according to the spirit of the present invention can be implemented. FIG. 11A illustrates operations centering on an RTLS tag device for Wi-Fi performing this location recognition method.

The illustrated method is a method of adjusting a cycle for waking up and sleeping the RTLS tag device according to an executed application.

The illustrated method includes initializing the RTLS tag device (S10); Scanning SSIDs broadcast from a plurality of APs (S20); Transmitting the scanned SSIDs and their reception sensitivity to an external RTLS server in a UDP manner (S30); Sleeping the RTLS tag device (S40); And determining a wake-up condition for the RTLS tag device (S50), and if the condition is satisfied, waking up the RTLS tag device (S60).

In addition, when the RTLS tag device has its own location value, and notifies the user of this, or performs a car navigation, the step of receiving the calculated location value from the RTLS server after the step S30 and before the step S40 It may further include.

As shown in FIG. 11A, the main basic operation of the RTLS tag device initialized by the user's power-on operation or the like (S10) performs an operation of scanning the SSID to detect the SSID sent from APs around the tag device. (S20), and transmits the scan result of the SSID to the RTLS server in the UDP (user datagram protocol) format (S30). Here, UDP is a method in which only a data is transmitted from a transmitting side when information is exchanged with each other on a network, that is, a method of transmitting data unilaterally from a transmitting side without going through a connection procedure with a receiving side.

In the step S50 illustrated in FIG. 5, a method of providing a condition for waking up the RTLS tag device may include a method of periodically waking up using a timer and a motion of the RTLS tag device detected using a motion sensor. There is a method of waking when, and a method of waking when receiving a predetermined signal (RF signal from the RF reader of the RFID system) from the outside.

11B illustrates a location recognition method in the case of the RTLS tag device further including a GPS module. Except for the GPS signal, detailed description is omitted since it is similar to the case of FIG. 8A.

FIG. 12 illustrates a structure of an embodiment of a location recognition system in which the RTLS tag device of FIGS. 2 to 10D may be used.

The illustrated location recognition system includes access points 200, 201, and 202 which are fixed facilities for wireless LAN communication; An RTLS tag device (100) for calculating a reception sensitivity of a signal transmitted from the access point; And a location calculation server that receives the reception sensitivity from the RTLS tag device 100 through the wireless LAN communication and calculates a location of the RTLS tag device 100.

If the Wi-Fi technology is applied to the location recognition system, as shown, the access point is the Wi-Fi AP 200, and as the RTLS terminal, the RTLS tag device 100 according to the spirit of the present invention can be applied. The location calculation server may implement the location recognition system with RTLS, which is an RTLS server 340. The RTLS may include a Wi-Fi supporting server 360 as a LAN server for supporting wireless LAN communication. .

That is, as one embodiment according to the spirit of the present invention, RTLS based on a WiFi WLAN may be implemented. The Wi-Fi WLAN-based RTLS may be used, for example, to track the location of a parked or moving vehicle.

APs that support the use of Wi-Fi-based wireless Internet in a specific area are generally installed to capture beacon signals of three or more APs at one point, so triangulation can be applied without the need for additional devices. . On the other hand, in the case of a mobile terminal base station installed so that two or less base station signals are caught at one point, it is difficult to use a triangulation method.

Referring to the operation of the RTLS illustrated in FIG. 12, the APs 200, 201, and 202 periodically transmit a beacon including the identification information (eg, SSID) on the AP's own Wi-Fi network to the RTLS tag device 100 periodically. Broadcast a signal (packet). Accordingly, the beacon signal may be analyzed to identify which AP is being broadcast.

Next, the RTLS tag device 100 receives the SSID of each of the APs 200, 201, and 202 from a plurality of APs (at least three APs when using the triangulation method), and receives the RSSI of each SSID. Calculate the strength indication.

The RTLS tag device 100 transmits the SSID and RSSI values of the APs 200, 201, and 202 to the AP connected to the AP (assuming AP 200) again as a LAN bridge. The AP support server 320 receiving the data from the LAN bridge AP 200 transmits the received data to the RTLS server 340. The RTLS server 340 determines the location of the RTLS terminal 100 that transmits the received data. For example, triangulation may be applied to SSID and RSSI values of at least three APs 200, 201, and 202 to determine the location of the RTLS tag device 100. Thereafter, the RTLS server 340 may transmit the determined position value to the RTLS tag device 100 via the AP support server 320 and the LAN bridge AP 200.

The RTLS server 340 calculates the position of the RTLS tag device 100 from reception sensitivity values of beacon signals received from the RTLS tag device 100 according to the spirit of the present invention.

The position calculation may include a process of estimating distance based on a received sensitivity value and calculating a position by triangulation.

Triangulation is a geometric method that is most commonly used in RTLS to estimate the real-time position of a moving object on a two-dimensional plane. At least three reference points are required to estimate the real-time position of a moving object on a two-dimensional plane.

Therefore, when the triangulation method is used in the position recognition method according to the spirit of the present invention, at least three APs must be transmitted beacon signals broadcast.

13 is a distance for measuring the position from the three reference points expressed as d1, d2, d3. The distance from each reference point to the target point for position measurement may be calculated by Pythagorean theorem of Equation 1 below.

d ₁ ² = (xx ₁ ) ² + (yy ₁ ) ²

d ₂ ² = (xx ₂ ) ² + (yy ₂ ) ²

d ₃ ² = (xx ₃ ) ² + (yy ₃ ) ²

In the case of using triangulation and radio signal strength information (RSSI), the distance d between the moving object (RTLS terminal) and the reference point AP may be obtained through the Friis formula of Equation 2 below.

λ is the wavelength of radio waves, c is the speed of radio waves, f is the frequency, and L is the transmission loss (ie, received signal strength) of the signal transmitted by the mobile entity. The transmission loss of the transmitted signal is obtained by the difference between the signal transmission strength of the mobile object and the strength of the received signal at the reference point.

In order to calculate the location of the RTLS tag device, in addition to the triangulation method mentioned in the above equations, Time of Arrival (TOA), Time of Flight (TOF), Time Difference of Arrival (TDOA), and Angle of Arrival (AOA), etc. Radio location techniques may also be applied.

The reception sensitivity value decreases as the distance increases, and the reception sensitivity value may be weakly measured even when the distance is not far due to an obstacle such as a wall or a building. This phenomenon may cause an error in the position calculation of the RTLS server according to the spirit of the present invention.

There are two ways to prevent the error.

In the first method, the RTLS server retains data on a region where an error with respect to a reception sensitivity value occurs in a database, and searches the database every time the position calculation is performed based on the reception sensitivity value. Check and correct. For correction, the database may have a data structure that stores identification symbols of the AP and its reception sensitivity values detected in an area where an error occurs, and corresponds to the location information measured in each case.

The second method is to predict the occurrence of an error according to an algorithm applying a predetermined path loss model. Path loss models include simple path loss model, wall attenuation model, and layer attenuation coefficient model. The most known outdoor path loss model is the Okumura-Hata model, which is an empirical formula that measures the actual urban environment.

FIG. 14 illustrates a location recognition method performed in the RTLS of FIG. 12.

According to the illustrated location recognition method, first, the RTLS tag apparatus 100 includes: receiving beacon signals from a plurality of access points (S110); Calculating reception sensitivity of the received beacon signals (S120); And transmitting the beacon signals and their received sensitivity values to a location calculation server (S130).

The RTLS server 346, which has received the beacon signals and the received sensitivity values of step S130, calculates the position of the RTLS tag device 100 using the received data (S140), and calculates the calculated RTLS tag device. The position value of 100 is transmitted to the RTLS tag device 100.

The illustrated RTLS tag device 100 receives SSIDs of at least three APs 200, 201, and 202, but performs data transmission / reception with the RTLS server 340 through one AP 200. That is, the RTLS tag device 100 selects one AP 200 having the most communication efficiency and performs wireless LAN communication. The RTLS tag device 100 may be connected to the RTLS server 346 through a wireless LAN communication and an internet network.

To this end, the RTLS tag device 100, after the step S110, may further comprise the step of connecting with one of the plurality of APs for wireless LAN communication.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

1 is a structural diagram showing the components of a location-based service system using GPS.

Figure 2 is a block diagram showing an embodiment of an RTLS tag device according to the spirit of the present invention.

3 is a block diagram showing another embodiment of an RTLS tag device according to the spirit of the present invention;

4 is a block diagram showing another embodiment of an RTLS tag device according to the spirit of the present invention;

5 is a block diagram showing another embodiment of an RTLS tag device according to the spirit of the present invention;

6 to 9 are block diagrams illustrating various embodiments of different configurations of a power supply unit constituting an RTLS tag device according to the inventive concept.

10A to 10D are block diagrams illustrating various modifications of the RTLS tag apparatus according to the spirit of the present invention.

11A and 11B are flowcharts illustrating a driving method performed in the RTLS tag apparatus according to the spirit of the present invention.

12 is a structural diagram illustrating a structure of a location recognition system to which an RTLS tag device according to the spirit of the present invention can be applied;

13 is a conceptual diagram for explaining the principle of triangulation.

FIG. 14 is a flowchart illustrating a location recognition method performed in the location recognition system of FIG. 12.

Claims (8)

A wireless communication unit for establishing a wireless communication channel with a wireless Internet base station; An acceleration module for measuring acceleration of a Real Time Locating System (RTLS) tag device at a preset period and outputting acceleration information; And Compute the reception sensitivity of the beacon signal transmitted from at least three different wireless Internet base stations, information including the reception sensitivity corresponding to each beacon signal and the identification symbol of the base station and the acceleration information received from the acceleration module RTLS (Real Time Locating System) tag device characterized in that it comprises a control unit for transmitting to a wireless Internet base station in which a wireless communication channel is formed. The method of claim 1, The control unit includes an RSSI detection unit for detecting the RSSI of the beacon signal transmitted by the wireless Internet base station. The method of claim 1, The wireless communication unit, the RTLS tag device, characterized in that for forming the wireless communication channel in accordance with the Wi-Fi wireless Internet standards. The method of claim 1, And a GPS module for receiving a synchronization signal through a GPS antenna and applying the received synchronization signal to the controller. The method of claim 1, And a power supply for adjusting the power input from the cigar jack of the vehicle and applying the driving power to the RTLS tag device. The method of claim 1, The control unit, A function of measuring reception sensitivity of the beacon signal, and And a single processor configured to package the acceleration information and the information including the reception sensitivity and the identification symbol of the base station. The method of claim 1, The control unit, RTLS tag device characterized in that for sequentially measuring the reception sensitivity of the three or more beacon signals. The method of claim 1, And the control unit is configured to package the information including the reception sensitivity and the identification symbol of the base station and the acceleration information using an RTLS server existing on the Internet as a receiver.

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