KR100923294B1 - Real-time position recognition method and system in a ubiquitous environment - Google Patents

Abstract

A real time location recognition method in a ubiquitous environment and a real time location recognition system using the same are provided. The ubiquitous real-time location recognition system according to the present invention comprises a location recognition terminal and a location recognition server, a system for recognizing the location of the location recognition terminal in real time using any one of GPS, WLAN and Zigbee. The location recognition terminal comprises: a GPS receiver for receiving a location information signal from a GPS satellite; Communication interface unit for transmitting and receiving wireless LAN, Zigbee and other RF signals; A control unit which collects the location information according to a preset priority among the GPS, the wireless LAN, the Zigbee method, and other RFs, and transmits the location information to the location recognition server through the communication interface unit; And a memory for storing the location information signal received from the GPS receiver or the communication interface unit.

Location recognition terminal, location recognition server, GPS, wireless LAN, Zigbee

Description

Real-time position recognition method and system in a ubiquitous environment

The present invention relates to real-time location recognition, and more particularly, real-time in the ubiquitous environment to provide an integrated and seamless location recognition service through various media such as GPS satellite, wireless LAN, Zigbee, various RF in the ubiquitous environment A location recognition method and system.

Traditional computing environments are static environments in which a user directly uses a device in front of a particular computing device. The ubiquitous environment is a dynamic and intelligent environment in which all computing devices in adjacent spaces cooperate with each other to help the user's convenience and work even if the user does not recognize the computing device.

Computing technology in the ubiquitous environment has evolved from the construction of machine-oriented environment, that is, convenient user environment and user interface environment, to the construction of human-centered environment, that is, interface environment with external environment information (location, temperature, direction, sound, etc.). have. In particular, the development of various services based on location information is being actively performed.

Basically, there are triangulation, fingerprinting, and cell ID.

Various wireless communication media are used to apply the above technology, and there may be a method using GPS satellites, WLAN, Zigbee, Bluetooth, RFID, UWB, UHF, VHF, LF, and the like.

Among the communication media, GPS satellites, WLANs, and Zigbees may be used as the most representative methods. Each of the communication media has the following characteristics.

In the position measurement using GPS satellites, at least four satellites must be recognized in the outdoor where the GPS satellites are recognized so that the position can be recognized by triangulation.

The location recognition using the wireless LAN is performed by using a triangulation method using signal strength information from each AP using an access point (AP) already installed in an existing office environment, or using a database that is previously surveyed and searched at various locations. Fingerprinting method can be used to determine the location of the terminal using a variety of environmental information, including signal strength information to increase the accuracy.

The method using Zigbee is similar to the method using wireless LAN, but in particular, using the method of Chirp Spread Spectrum (CSS), it is possible to measure the transmission time of the signal between the terminal and the Zigbee AP relatively accurately, and the distance measurement according to the signal strength The accuracy can be increased from the distance calculated by the information, and thus the distance recognition accuracy can be much improved when performing triangulation based on the information.

Methods for recognizing the location are separated by communication media, and there may be advantages and disadvantages for each method. Therefore, a communication medium and a location recognition method are determined according to a service and a place to be applied.

However, it is difficult to perform a desired location awareness service by only one method. For example, a large business with a factory and an office can be divided into an indoor office space, a space with factory facilities, and an area outside the building. There are ways to go about it. GPS satellites may be appropriate outside the building, but GPS satellites are not suitable in indoor office spaces.

The technical problem to be solved by the present invention is real-time location recognition in a ubiquitous environment that can recognize the location in real time using a GPS satellite, wireless LAN, Zigbee and various RF in various places, such as outside the building, office space, factory To provide a method and system.

System for providing a real-time location recognition service for ubiquitous according to the present invention, consisting of a location recognition terminal and a location recognition server, using a method of any one of the GPS, wireless LAN and ZigBee real-time location of the location recognition terminal A system for recognizing, the location recognition terminal, GPS receiver for receiving a location information signal from a GPS satellite; Communication interface unit for transmitting and receiving wireless LAN, Zigbee and other RF signals; A control unit which collects the location information according to a preset priority among the GPS, the wireless LAN, the Zigbee method, and other RFs, and transmits the location information to the location recognition server through the communication interface unit; And a memory for storing the location information signal received from the GPS receiver or the communication interface unit.

The communication interface unit detects a signal from the WLAN AP when location recognition using the WLAN method, and collects the signal strength from the WLAN APs when the signal strength of the WLAN AP is greater than a reference value. Wireless LAN module for transmitting to the location server; And when position recognition using ZigBee and other RF methods, if the number of ZigBee and other RF AP is 3 or more, ZigBee to calculate the time to reach the ZigBee and other RF AP to transmit to the location recognition server and Includes other RF modules.

When using the GPS method for location recognition, the communication interface unit receives a location information signal from the GPS satellites if the number of GPS satellites for which signals are detected is four or more, and transmits the signal through a WLAN AP or a Zigbee or other RF AP. Preferably, the location information signal is transmitted to the location recognition server.

If the location is not recognized by any one of GPS, WLAN, Zigbee, and other RF methods, the controller controls the ID of the detected AP to be transmitted to the location recognition server through a communication interface. It is desirable to recognize the area where the location recognition terminal is located.

The location recognition terminal may further include an RFID / smart card unit for identifying location information at the time of gate access or payment, using an RFID tag for access control and a smart card for data security for payment.

The RFID / smart card unit receives a location information signal that encrypts location information data by using a hardware-based encryption / decryption engine or an encryption / decryption dedicated chip in the smart card of the location recognition server, so that the engine or encryption / decryption of the smart card is received. It is preferable to decode using a dedicated chip.

The location recognition terminal may include a user interface that indicates that the location recognition terminal is currently in a dangerous or restricted access area, or that a user may input by a simple key operation when an emergency occurs; And receiving the location information recognized by the location recognition server through the communication interface, and may further include an LCD to display the location information in text or graphics.

The location recognition terminal, the voice call module for transmitting and receiving voice information to the location recognition server or another location recognition terminal; And an image camera unit for acquiring image information capable of knowing various situations around the location recognition terminal.

The location recognition terminal further includes a biometric sensor for measuring various types of biometric information such as a user's pulse, body temperature, blood sugar, and the like, wherein the control unit causes the communication interface unit to transmit the biometric information measured by the biometric sensor. Can be sent by

The position recognition terminal further includes a displacement sensor for detecting displacement information of any one of speed, acceleration, and position of the terminal, and the control unit causes the communication interface unit to transmit the displacement information detected by the displacement sensor. Can be sent to the recognition server.

The position recognition terminal is attached to the water leisure mechanism, and each person occupied in the water leisure mechanism possesses the same function terminal as the position recognition terminal, so that the position recognition terminal outputs the output signal of the terminal possessed by the occupant. It collects and transmits the data to the location recognition server through the wireless AP, and the location recognition server uses the data to manage the location of each person or group in the water leisure organization, and if there is a person who has escaped from the boarding personnel. Using the biometric information in his terminal or the separation signal information with the water leisure terminal to generate an alarm signal to the neighboring wireless AP or another neighboring terminal, and the communication interface unit from the location recognition server Weather and weather through communication AP that can be accessed from WLAN AP or Zigbee and other RF APs Receives a dangerous situation signal due to a sudden change of the user interface, the user interface to notify the alarm or received a text signal of the dangerous situation to enable the user to recognize the dangerous situation and evacuate quickly, in case of distress, The communication interface unit transmits emergency information to the location recognition server through a communication AP that can be connected to the WLAN AP or Zigbee and other RF APs, and the location recognition server sends an emergency situation to the rescue personnel closest to the distress. When distress is unconscious due to shock during distress and unable to send a rescue signal, it is preferable to recognize that the distance between the position recognition terminal attached to the boat and the position recognition terminal possessed by the distress is farther away. .

In the ubiquitous environment according to the present invention, a real-time location recognition method includes a location recognition terminal and a location recognition server, and the location of the location recognition terminal in real time using any one of GPS, WLAN, and Zigbee. A method for recognizing a network, the method comprising: setting priority of location recognition for the GPS, WLAN, and ZigBee schemes; The location recognition terminal, transmitting the current location information of the location recognition terminal to the location recognition server using any one of the GPS, WLAN and ZigBee according to the priority; And the location recognition server calculates a current location of the location recognition terminal using location information received from the location recognition terminal.

In the step of transmitting the location information, in the case of location recognition using GPS, if the number of GPS satellites detected signal is four or more, receiving the location information signal from the GPS satellites, and through the WLAN AP or Zigbee AP Preferably, the location information signal is transmitted to the location recognition server.

In the step of transmitting the location information, when performing location recognition using a WLAN, if the signal strength of the WLAN AP is greater than a reference value by detecting the signal of the WLAN AP, the radio wave strength of the WLAN AP is determined by the location It is preferable to transmit to the recognition server.

In the step of transmitting the location information, when performing location recognition using ZigBee, if the number of ZigBee APs is determined to be 3 or more, it is preferable to calculate the arrival time to the ZigBee AP and transmit the calculated time to the location recognition server.

In the step of transmitting the location information, if the location is not recognized by any one of the GPS, WLAN and ZigBee method, further comprising the step of recognizing the area of the location recognition terminal from the identifier of the detected AP can do.

In the step of transmitting the location information, the same procedure as that of Zigbee using various RF, for example, Bluetooth, Active RFID, UWB, UHF, VHF, LF, etc., instead of the location recognition method using Zigbee. You can also apply the method to perform the location recognition function.

By using the RFID tag for the access control and the smart card for the data security purpose for payment, the location information can be grasped at the gate access or payment, and can be used for the purpose of supplementing the location recognition method.

In the situation where most location-related services are being made in a wireless environment, the location information of an individual needs to be transmitted. However, the location information of an individual can be easily exposed and used for other purposes. In order to prevent this in the present invention, it is possible to selectively decrypt and send important data such as location information between the server and the location recognition terminal by using the encryption / decryption engine or the encryption / decryption dedicated chip of the smart card.

Encrypts sensitive data such as location information and sends it to the user's location recognition terminal by using hardware-based encryption / decryption engine or encryption / decryption chip in the smart card in the server, and dedicated engine or encryption / decryption of the smart card in the location recognition terminal. Decode using a chip.

According to the present invention, GPS satellites, wireless LANs, ZigBee, various RF and the like can be integrated in real time anywhere in the office space, inside the factory, outside the building, and can recognize the location seamlessly. In addition, by periodically sending the user's biometric information to the location recognition server to receive a variety of health-related services, in the event of an emergency situation by the user's request or the server's judgment to determine the appropriate action Can be taken.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For each figure, like reference numerals denote like elements.

1 is a block diagram illustrating a configuration of a location recognition system including a terminal for providing a ubiquitous real-time location recognition service according to the present invention.

The location recognition system consists of a location recognition terminal 100 and a location recognition server 200.

The location recognition terminal 100 communicates with the location recognition server 200 through the network 190 via a WLAN access point (170) AP or Zigbee and other RF AP 180.

The location recognition terminal 100 includes a GPS receiver 110, a communication interface unit 120, a controller 130, and a memory 140.

The GPS receiver 110 receives a location information signal from a GPS satellite (not shown). The location information signal received by the GPS receiver 110 is transmitted to the location recognition server 200 through the communication interface 120.

The location recognition server 200 detects the current location of the location recognition terminal 100 by using a triangulation method, a fingerprint printer, and a Cell ID method from the received location information signal.

The communication interface unit 120 transmits the location information signal of the location recognition terminal 100 to the location recognition server 200 and receives a message from the location recognition server 200. The communication interface unit 120 includes a WLAN module 122 and a Zigbee and other RF module 124.

The WLAN module 122 serves to communicate with the WLAN AP 170. The WLAN module 122 transmits a signal (for example, an identifier of the WLAN module) indicating its existence every predetermined period (for example, 1 second). When the user carries the location recognition terminal 100 and enters the building, the identifier signal of the WLAN module 122 is received by the WLAN AP 170. The WLAN AP 170 checks the identifier of the WLAN module 122 and uses the network 190 together with the identifier information of the WLAN module 122 together with the WLAN AP 170 identifier information. )

ZigBee and other RF modules 124 are responsible for communicating with ZigBee and other RF APs 180. ZigBee and other RF modules 124 transmit a signal (eg, an identifier of a ZigBee module) indicating their presence every predetermined period (eg, 1 second). When the user carries the location recognition terminal 100 and enters the factory, the identifier signal of the Zigbee module 124 is received by the Zigbee and the other RF AP 180. The Zigbee AP 180 checks the identifier of the Zigbee module 124 and transmits the identifier information of Zigbee Mobile to the location recognition server 200 using the network 190 together with the identifier information of Zigbee and other RF AP 180. do .

The controller 130 controls the overall operation of the location recognition terminal 100. In particular, the controller 130 collects the location information according to the priority of the GPS, WLAN, ZigBee method. The priority may be preset in order of, for example, GPS, WLAN, Zigbee, and other RF, or may be arbitrarily set by the user.

When the location is recognized by the WLAN or ZigBee and other RF methods, the controller 130 extracts the location information of the user by using the wireless signal transmitted from the WLAN AP 170 or the ZigBee and the other RF AP 180. do. The location information of the user includes the location on the plane, the location of the floor, the division of the building, etc .. If the interior is a single floor, it may be represented by two-dimensional plane coordinates, and in the case of a multilayer, it may be represented by three-dimensional spatial coordinates. In addition, information such as time may be added and provided. This location information is obtained from the information of the location-aware radio signal.

In the information of the radio signal used as the location information, there is a difference between the transmission time and the reception time or the strength of the reception radio wave. In order to obtain more accurate location information, first, distance information between the location recognition terminal 100 and the WLAN AP 170 should be obtained. Such distance information may be obtained by visual difference or strength of radio waves or a combination thereof. It is already known to use a radio wave to obtain a distance from a transmitting device to a specific point on a plane or a space, and the position from the WLAN AP 170 is based on a natural fact that a radio wave propagation speed is constant. The distance information according to the difference between the transmission time of the edible wireless signal and the reception time in the position recognition terminal 100 may be extracted. Alternatively, distance information may be obtained using the strength of received radio waves at each location.

The communication interface unit 120 may further include an RFID tag / smart card unit 126.

The RFID tag / smart card unit 126 is a part for performing data security purposes for access control and payment. When an event such as gate entry or payment occurs, the RFID tag / smart card reader 185 generates an event location and The recognized ID value is transmitted to the location recognition server 200 through a wire and used as a location recognition aid.

In the situation where most location-related services are being made in a wireless environment, the location information of an individual needs to be transmitted. However, the location information of an individual can be easily exposed and used for other purposes. In order to prevent this in the present invention, by using the encryption / decryption engine of the smart card or the dedicated encryption / decryption chip, important data such as location information between the location recognition server 200 and the location recognition terminal 100 may be selectively decrypted and sent. Make sure

The location recognition server 200 encrypts important data such as location information by using a hardware-based encryption / decryption engine or a dedicated encryption / decryption chip in a smart card, and sends it to the location recognition terminal 100 of the user. ) Is decrypted using the engine (or the encryption / decryption dedicated chip) of the smart card in the RFID tag / smart card unit 126.

The memory 140 stores the location information signal received from the GPS receiver 110 or the location information received through the communication interface 120.

The location recognition terminal 100 may further include a user interface unit 150 and an LCD unit 160.

The user interface 150 may include a plurality of LEDs (not shown) for displaying a communication state, a power state, and the like to the user. This LED may indicate that the location aware terminal 100 is currently in a dangerous or restricted area.

In addition, the user interface unit 150 may include a key (not shown) that a user can input by simple key manipulation in case of an emergency, and may be used as an input means for various location-based services.

Location-based services provide people-finding services, such as services that help you find out where you are, find your coworkers' location, or find your child's location in an amusement park, etc. There may be a Point of Interest (POI) service. For this service, the LCD unit 160 may be provided to display location information, data, and messages received from the location recognition server 200 for the various services in text or graphics.

In addition, the location recognition terminal 100 may further include a voice call module 152. The image information obtained by the image camera unit 154 is transmitted to the location recognition server 200 or another location recognition terminal (not shown).

When using the voice call module 152 or the video camera unit 154, for example, in the case of a task that requires organic cooperation between workers in a work site such as a large factory, the location of each user in the center and the surrounding images, Based on voice information, more accurate work orders can be given, and the worker can maximize collaboration by using other worker's location, surrounding images, and voice information. Alternatively, when the firefighters fight, the location of each firefighter and the current situation of the firefighters can be identified at the central control station by real-time voice and video, and help to make various decisions such as the arrangement and additional input of the firefighters accordingly. Can serve as an important source of information.

The location recognition terminal 100 may further include a biosensor 156.

The biometric sensor 156 may measure various biometric information, such as a user's pulse, body temperature, and blood sugar, at predetermined intervals. The biometric information measured by the biometric sensor 156 is sent to the controller 130. The controller 130 causes the communication interface 120 to transmit the biometric information to the location recognition server 200.

The biometric information obtained from the biometric sensor 156 may be used for healthcare.

The location recognition server 200 transmits a message to the location recognition terminal 100 when there is an abnormality in the user's body based on the received biometric information and thus requires rest or medication. In addition, the location recognition server 200 may provide a service for guiding the nearest hospital based on the identified location of the user when it is determined that medical care is necessary. If it is determined that urgent action is necessary, the location recognition server 200 may notify and dispatch the rescuer.

The location recognition terminal 100 operates the image camera unit 154 in an emergency state and transmits real-time image information around the user to the location recognition server 200.

In addition, the position recognition terminal 100 may further include a displacement sensor 158 that can measure the speed, acceleration or position. Velocity, acceleration, or position information measured by the displacement sensor 158 is transmitted to the position recognition server 200 through the communication interface unit 120 so that detailed movement information of the user can be grasped, so as to identify the amount of exercise or physical injury information. Make sure you understand. For example, the measured biometric information and the information of the displacement sensor 158 can be used to calculate the user's exercise amount information, so that it can be used in services for the user's health care. In addition, when the displacement sensor 158 detects a change in position due to a sudden fall of a user or other physical injury, the position recognition terminal 100 transmits the change information to the position recognition server 200 and the position recognition server. The 200 may use the change information to notify the 119, the medical institution, and the family to provide a rescue service suitable for a situation.

In addition, the location recognition terminal 100 may be used for water leisure.

If a distress occurs, the distress may press emergency signal (not shown) provided in the user interface unit 150 to inform the location recognition server 200 of the emergency situation information. In this case, the image information obtained by the image camera unit 154 may also be transmitted to the location recognition server 200.

The communication interface unit 120 notifies an emergency situation to the location recognition server 200 through the best communication AP that can be connected among the WLAN AP 170 or the Zigbee and the other RF AP 180. The location recognition server 200 notifies the rescue personnel of the nearest location to the distress so as to rescue the situation, and also informs the medical institutions, such as 119, prompt relief measures.

The location recognition terminal 100 may be attached to a predetermined position of the water leisure mechanism. In this case, the terminal attached to the water leisure mechanism can be equipped with a large capacity battery and a high-sensitivity output antenna so that communication with the position recognition server can be made. Communication with the terminal attached to the device can be made to reduce power consumption. The terminal attached to the water leisure mechanism collects the output signal of the terminal possessed by the occupants and transmits it to the position recognition server through the wireless AP, and the position recognition server uses this data to locate each person or the person boarding the water leisure mechanism. Manage locations in groups. If there is a person who has escaped, the alarm signal is generated to a neighboring wireless AP or another neighboring terminal indicating that there is a person who has been separated using the biometric information in the terminal possessed by him or the separation signal information with the water leisure terminal.

If communication with the terminal in the water leisure mechanism is not possible, try to communicate with the surrounding AP. The terminal attached to the water leisure organization periodically communicates with the terminal possessed by the user in the water leisure organization to determine the existence. If the location recognition terminal attached to the water leisure mechanism and the user terminal is not communicated, the user may be separated from the boat, such as falling from the water leisure mechanism, so the location recognition server 200 may recognize it as a distress. Even when the distress does not send a rescue signal due to the consciousness of the shock during the distress, the location recognition server 200 may recognize the distress situation and notify the rescue personnel, 119, medical institutions.

When the location recognition server 200 affects the water leisure activity due to a sudden change in weather and diary, an alarm signal is sent to the location recognition terminal 100, and the user can recognize and promptly evacuate, thereby preventing an accident in advance. It can also perform a function.

2 is a flowchart illustrating a real-time location recognition method in a ubiquitous environment according to the present invention. The real-time location recognition method shown in FIG. 2 will be described in conjunction with the components of the location recognition system shown in FIG. In the ZigBee and other RF modules shown in FIG.

1 and 2, the user sets the priority of location recognition for GPS, WLAN and ZigBee using the location recognition terminal 100 (S200).

It is determined whether any signal is received by the location recognition terminal 100 (step S210). If any one of the GPS, WLAN and ZigBee signals are not received, the LCD unit 160 displays no signal (S220).

It is determined whether the location can be recognized by any one of the GPS, WLAN, and Zigbee methods (S230). For example, in the case of GPS, the number of GPS satellites to be detected should be 4 or more, in the case of WLAN, the strength of the signal from the WLAN AP must be greater than or equal to a predetermined reference value, and in the case of Zigbee, the Zigbee AP is detected. Must be greater than or equal to 3.

If any one of these conditions is satisfied, i.e., if the location can be recognized by any one of GPS, WLAN, and ZigBee, the location recognition terminal 100 can be located using one of GPS, WLAN, and ZigBee. Recognize the position of step (S240). When the location recognition terminal 100 transmits the location information to the location recognition server 200 using any one of GPS, wireless LAN, and Zigbee, the location recognition server 200 uses the location recognition terminal ( Calculate the current position of 100). Recognizing the location using each method will be described in detail with reference to FIGS. 3 to 8.

If this condition is not satisfied, i.e., the location cannot be recognized by any one of GPS, WLAN and ZigBee, the location recognition terminal 100 using the cell ID technique described in steps S250 to S280. Recognizes the area where is located.

When detecting the WLAN AP in step S250, the location recognition terminal 100 transmits the identifier of the detected WLAN AP to the location recognition server 200 (step S260).

When detecting the Zigbee AP in step S270, the location recognition terminal 100 transmits the identifier of the detected Zigbee AP to the location recognition server 200 (step S280).

The method of recognizing the area where the location recognition terminal 100 is located by using the cell ID technique described in steps S250 to S280 has been described as detecting the area by detecting the WLAN AP or the Zigbee AP, but is not limited thereto. You can use any wireless network that can recognize your location.

3 is a flowchart illustrating a step of recognizing a location using a GPS method, and FIG. 4 is a view for explaining location recognition using a GPS method.

3 and 4, the location recognition terminal 100 detects a GPS satellite signal (S300). When the number of GPS satellite signals is 4 or more in step S310, the GPS location information signal is transmitted to the location recognition server through wireless LAN or ZigBee through steps S320 to S350.

If the WLAN AP is detected (step S320), that is, if the AP 410 located closest to the location recognition terminal 100 is the WLAN AP, the GPS location information is referred to the location recognition server 200 (see FIG. 1). In step S330).

If the Zigbee AP is detected (step S340), that is, if the AP 410 located closest to the location recognition terminal 100 is the Zigbee AP, the GPS location information is transmitted to the location recognition server 200 in Zigbee (step S350). ). The AP 410 is not limited to the WLAN AP or the Zigbee AP, and any AP may be used as long as it can communicate with the location recognition server 200 through the network. In this manner, the current location of the location recognition terminal 100 may be calculated using triangulation from the GPS location information signal transmitted to the location recognition server 200.

FIG. 5 is a flowchart illustrating a step of recognizing a location using a wireless LAN method, and FIG. 6 is a view for explaining location recognition using a wireless LAN method.

5 and 6, the location recognition terminal 100 detects signals from WLAN APs 170a, 170b and 170c (S500). It is determined whether the intensity of the detected signal is equal to or greater than the reference value (step S510). If the signal strength is less than the reference value, the location recognition step using the WLAN method is terminated.

If the detected signal strength is greater than or equal to the reference value, the location recognition terminal 100 collects the signal strength by the WLAN APs 170a, 170b, and 170c (S520). The location recognition terminal 100 transmits the collected signal strength to the location recognition server 200 (see FIG. 1) (S530). As described above, distance information between the location recognition terminal 100 and the WLAN APs 170a, 170b, 170c may be obtained from the signal strength information, and the current location may be calculated from the distance information by using triangulation. have.

7 is a flowchart illustrating a step of recognizing a location by a Zigbee method, and FIG. 8 is a view for explaining a location recognition by a Zigbee method.

7 and 8, the location recognition terminal 100 detects signals from ZigBee APs 180a, 180b, and 180c (S700). It is determined whether the detected number of detected Zigbee APs is 3 or more (S710). If the number of recognition of the Zigbee AP is less than 3, the location recognition step using the Zigbee method is terminated.

If the detected number of detected Zigbee AP is 3 or more, the location recognition terminal 100 collects the signal arrival time to the payment AP (180a, 180b, 180c) (step S720). The location recognition terminal 100 transmits the collected signal arrival time to the location recognition server 200 (see FIG. 1) (S730). As described above, distance information between the position recognition terminal 100 and the Zigbee APs 180a, 180b, and 180c may be obtained from the signal arrival time information, and the current position may be calculated using the triangulation method from the distance information. have.

When using the Zigbee method, the location of the location recognition terminal 100 can be recognized even where GPS cannot be applied, such as in a building or underground. ZigBee wireless communication offers a low data rate of up to 250kbps, low cost and low power, and is easy to install and manage. In addition, ZigBee wireless communication provides multihomed routing at the network layer, so each node relays and relays information over a long distance.

In addition to the method of recognizing the location using the GPS, the wireless LAN, and the Zigbee method illustrated in FIGS. 3 to 8, the location may be recognized by various methods. For example, the method may be extended to a method using an ultrasonic signal, a method using an ultra wide band (UWB), a method using an RF signal, and the like. Briefly described as follows.

The method of using the ultrasonic signal is to install an ultrasonic receiver on the ceiling, attach the ultrasonic generator to the robot, calculate the distance by measuring the time from the generator to the receiver, and use the signal delay received from the various receivers based on this distance. It is a technique to determine the position of the robot. This method can detect the propagation delay relatively accurately because the sound wave propagation speed is relatively slow, but has a disadvantage of being affected by furniture and surrounding objects.

UWB (Ultra Wide Band) method is similar to ultrasonic system, but UWB is very suitable for location recognition system because it has very good distance resolution and can accurately estimate the travel time of the signal. Because of its excellent permeability by operating in the non-LOS (Line-of-Sight) environment, the location recognition accuracy is excellent even in indoor or shadowed environment. And, unlike infrared or ultrasonic waves, which must be configured separately in at least closed spaces, UWB signals can penetrate walls, reducing the number of transmitters installed.

The technology for determining the location by measuring the strength of the RF signal is to measure the strength of the signal transmitted from the base station or broadcasting station transmitting the wireless data, the WLAN AP at each measurement point to statistically analyze the result, and use the analysis result It is a technology to determine the position of the robot by measuring how much strength signal is input from the current position. In this method, the signal strength changes from time to time depending on various environments such as temperature and humidity, and the precision is about 1 to 3m, which is not suitable for accurate positioning of the robot indoors.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1 is a block diagram showing the configuration of a location recognition system including a terminal for providing a real-time location service for ubiquitous in accordance with the present invention.

2 is a flowchart illustrating a real-time location recognition method in a ubiquitous environment according to the present invention.

3 is a flowchart illustrating a step of recognizing a location by a GPS method.

4 is a view for explaining position recognition by the GPS method.

5 is a flowchart illustrating a step of recognizing a location by a WLAN method.

6 is a view for explaining position recognition by a wireless LAN method.

7 is a flowchart showing a step of recognizing a position by a Zigbee method.

8 is a view for explaining position recognition by the Zigbee method.

Claims (13)

In the system consisting of a location recognition terminal and a location recognition server, and recognizes the location of the location recognition terminal in real time using any one method of GPS, WLAN, Zigbee and RF, The location recognition terminal, A GPS receiver for receiving a location signal from a GPS satellite; Communication interface unit for transmitting and receiving wireless LAN, Zigbee and RF signal; A control unit which collects the location information according to a preset priority among the GPS, the wireless LAN, the Zigbee method, and the RF, and transmits the location information to the location recognition server through the communication interface unit; And It includes a memory for storing the location information signal received from the GPS receiver or the communication interface, The communication interface unit, In case of location recognition using a WLAN method, if a signal from the WLAN AP is detected and the signal strength of the WLAN AP is greater than a reference value, the signal strength from the WLAN APs is collected to the location recognition server. A wireless LAN module for transmitting; And In the case of location recognition using ZigBee and RF, if the number of ZigBee and RF AP is 3 or more, the ZigBee and RF module includes a ZigBee and an RF module for calculating the time to reach the ZigBee and the RF AP and transmitting it to the location recognition server. and, The location recognition terminal, Using a RFID tag for access control and a smart card for data security for payment, it is possible to grasp the location information when entering or exiting a gate, or a hardware-based encryption / decryption engine or encryption / decryption in the smart card of the location recognition server. Ubiquitous real-time location recognition system comprising an RFID and a smart card unit for receiving the location information signal encrypted with the location information data using a dedicated chip, and decrypting it using the engine or the encryption / decryption dedicated chip of the smart card. . The method of claim 1, wherein the communication interface unit, In the case of location recognition using a GPS method, if the number of GPS satellites for which signals are detected is four or more, a location information signal is received from the GPS satellites, and the location information signal is transmitted through a WLAN AP or a Zigbee and an RF AP. Ubiquitous real-time location recognition system, characterized in that the transmission to the location recognition server. The method of claim 1 or 2, wherein the control unit, If the location is not recognized by any one of GPS, WLAN, ZigBee, and RF, the ID of the detected AP is controlled to be transmitted to the location recognition server through a communication interface, whereby the location recognition terminal is located. Ubiquitous real-time position recognition system, characterized in that to recognize the area. delete According to claim 1, The location recognition terminal, A user interface unit indicating that the location recognition terminal is present in a dangerous or restricted area, or a user can input by simple key operation in case of emergency; And When receiving the position information recognized by the position recognition server through the communication interface, real-time position recognition system for ubiquitous, characterized in that it further comprises an LCD unit for displaying the position information in text or graphics. The method of claim 5, wherein the location recognition terminal, A voice call module for transmitting and receiving voice information to the location recognition server or another location recognition terminal; And Ubiquitous real-time position recognition system further comprises an image camera unit for obtaining image information that can know the various situations around the position recognition terminal. The method of claim 5, wherein the location recognition terminal, A biometric sensor for measuring biometric information of any one or more of a user's pulse, body temperature, and blood sugar; And Further comprising a displacement sensor for detecting displacement information of any one or more of the speed, acceleration, position of the position recognition terminal, The control unit periodically transmits the biometric information measured by the biometric sensor or the displacement information detected by the displacement sensor to the communication interface unit to the location recognition server, and the location recognition server based on the received biometric information. If there is a problem with the body and need to rest or medication, a message is sent to the location-aware terminal, and if it is determined that medical care is needed, the service is provided to guide the nearest hospital based on the identified location of the user, and urgent action. 119, notify the medical institution to dispatch rescue workers, and analyze the signal from the displacement sensor to grasp the detailed movement information of the user so as to grasp the exercise amount or physical injury information, User health care using measured exercise volume If the displacement information is suddenly changed, the user may fall down or have a physical injury. Therefore, it is possible to analyze the biosignal and video signal sent by the location recognition terminal and turn it into an accident. Real-time location recognition system for ubiquitous, characterized in that through the wired and wireless means to inform 119, medical institutions, and families to provide rescue services in accordance with the situation. The method of claim 5, The position recognition terminal is attached to the water leisure mechanism, and each person occupied in the water leisure mechanism possesses the same function terminal as the position recognition terminal, so that the position recognition terminal outputs the output signal of the terminal possessed by the occupant. It collects and transmits the data to the location recognition server through the wireless AP, and the location recognition server uses the data to manage the location of each person or group in the water leisure organization, and if there is a person who has escaped from the boarding personnel. Using the biometric information in his terminal or the separation signal information with the water leisure terminal, an alarm signal is generated to the neighboring wireless AP or another neighboring terminal, The communication interface unit receives a dangerous situation signal due to a sudden change in weather and weather through the communication AP accessible from the WLAN AP or Zigbee and RF AP from the location recognition server, and the user interface unit receives the received dangerous situation signal Alerts or texts to alert users to dangerous situations and evacuate quickly. When a distress occurs, the communication interface unit transmits emergency information to the location recognition server through a communication AP that can be connected to either the WLAN AP or the Zigbee and RF AP, and the location recognition server sends the rescuer to the rescuer nearest to the distress. Notify the emergency situation, even if the distress is unconscious due to the shock during the distress, and the distress signal is recognized, the distance between the position recognition terminal attached to the water leisure mechanism and the position recognition terminal possessed by the distress is distressed. Ubiquitous real-time position recognition system, characterized in that judging. In a location recognition system consisting of a location recognition terminal and a location recognition server, in a method for recognizing the location of the location recognition terminal in real time using any one of GPS, WLAN, Zigbee and RF, Setting priority of location recognition for the GPS, WLAN, Zigbee, and RF schemes; The location recognition terminal, transmitting the current location information of the location recognition terminal to the location recognition server using any one of the GPS, wireless LAN, Zigbee, and RF according to the priority; And The location recognition server is a real-time location recognition method in a ubiquitous environment comprising the step of calculating the current location of the location recognition terminal using the location information received from the location recognition terminal. The method of claim 9, wherein in the step of transmitting the location information, In the case of location recognition using a GPS method, if the number of GPS satellites for which signals are detected is four or more, a location information signal is received from the GPS satellites, and the location information signal is transmitted through a WLAN AP or a Zigbee and an RF AP. Real-time location recognition method in a ubiquitous environment, characterized in that the transmission to the location recognition server. The method of claim 9, wherein in the step of transmitting the location information, In case of location recognition using a WLAN method, if the signal strength of the WLAN AP is detected by detecting the signal from the WLAN AP, the signal recognition server is collected by collecting the signal strength from the WLAN AP. Real-time location recognition method in a ubiquitous environment, characterized in that for transmitting. The method of claim 9, wherein in the step of transmitting the location information, In the case of location recognition using ZigBee and RF, if the number of ZigBee and RF AP is 3 or more, the ZigBee and RF module includes a ZigBee and an RF module for calculating the time to reach the ZigBee and the RF AP and transmitting it to the location recognition server. Real-time location recognition method in a ubiquitous environment, characterized in that. The method of claim 9, In the step of transmitting the location information, if the location is not recognized by any one of GPS, WLAN, ZigBee and RF, the step of recognizing the area where the location recognition terminal is located from the identifier of the detected AP Real-time location recognition method in a ubiquitous environment, characterized in that it further comprises.

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