WO2006073274A1 - Terminal de communication mobile conçu pour communiquer avec une etiquette rf et systeme fournissant des informations d'emplacement utilisant les deux - Google Patents

Terminal de communication mobile conçu pour communiquer avec une etiquette rf et systeme fournissant des informations d'emplacement utilisant les deux Download PDF

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Publication number
WO2006073274A1
WO2006073274A1 PCT/KR2006/000048 KR2006000048W WO2006073274A1 WO 2006073274 A1 WO2006073274 A1 WO 2006073274A1 KR 2006000048 W KR2006000048 W KR 2006000048W WO 2006073274 A1 WO2006073274 A1 WO 2006073274A1
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WO
WIPO (PCT)
Prior art keywords
ion
tag
unit
terminal
information
Prior art date
Application number
PCT/KR2006/000048
Other languages
English (en)
Inventor
Dong-Wook Seo
Original Assignee
Dong-Wook Seo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020050030301A external-priority patent/KR100554006B1/ko
Application filed by Dong-Wook Seo filed Critical Dong-Wook Seo
Publication of WO2006073274A1 publication Critical patent/WO2006073274A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
    • G01S13/82—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted
    • G01S13/825—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems wherein continuous-type signals are transmitted with exchange of information between interrogator and responder

Definitions

  • the present invention relates to a technology for providing location informat ion using a tag and a mobi le communicat ion terminal .
  • a conventional technology for providing locat ion information includes a technology for providing the appropriate location of a terminal based on informat ion about the locat ion of an active base station to which the corresponding terminal is currently connected, using information about act ive base stat ions for respective terminals that is managed to support mobi le communication.
  • an object of the present invention is to provide a means that enables the location of a target , for example, an infant , a toddler , or an object , that is not carrying a terminal for the location.
  • a mobi le communicat ion terminal In order to accompl i sh the above objects, a mobi le communicat ion terminal according to an aspect of the present invent ion is characterized in that it searches for surrounding tags and transmits necessary data such that informat ion about the location of the found tag can be detected by a remote host computer .
  • the mobi le communicat ion terminal that moves whi le being carried by an individual is used as a base stat ion for communicat ing with tags, so that a tag module itsel f can be implemented to have a simple structure and, at the same t ime , a locat ion can be detected relat ively accurate.
  • a mobi le communicat ion terminal in accordance with addit ional aspect of the present invent ion is characterized in that it col lects data, which is measured by biologi cal sensors connected to a tag, and transmits the col lected data to the remote host computer .
  • biological data about individuals can be col lected, and a module for col lect ing the biological data can be compact ly and inexpensively manufactured.
  • locat ion informat ion is provided from informat ion about the locat ion of a mobi le communicat ion terminal that col lects informat ion about tags , not from the tags i tsel f , so that the construct ion of the tags can be simpl i fied.
  • the tags perform local area communicat ion, so that it is possible to provide relat ively accurate locat ion informat ion.
  • FIG. 1 shows the entire construction of a system for providing locat ion information according to an embodiment of the present invention
  • FIG. 2 is a module device 10 according to an embodiment of the present invent ion
  • FIG. 3 is a block diagram showing the schematic construct ion of a mobi le communication terminal 20 having a tag reader function according to an embodiment of the present invent ion! and
  • FIG. 4 is a block diagram schematical ly showing a system for providing locat ion informat ion according to a preferred embodiment of the present invention. [Best Mode]
  • FIG. 1 shows the entire construction of a system for providing location information according to an embodiment of the present invention.
  • the system for providing location information according to the embodiment includes a plural ity of module devices 10 respectively provided with tags therein, a mobi le communication terminal 20 for searching for the plural ity of module devices , establ ishing a connection to a found module, and then receiving and col lecting data, a matching device 40 for matching data communication between a wireless communication network and a wired communication network, a host computer 50 configured to be capable of communicating with at least one mobi le communication terminal 20 through the communication networks and to receive col lected tag data from the mobi le communication terminal 20, and a terminal 30 for request ing the host computer 50 to provide location information or inputting requests through the communicat ion network, for example, a Personal Computer (PC) .
  • PC Personal Computer
  • Each of the module devices 10 may be instal led and carried in, for example, a watch, and carried as shown in FIG. 1, but the present invention is not l imited thereto.
  • Each of the module devices 10 may be a module that is mounted on various art icles of clothing, such as a hat or a leather belt , or be surgical ly implanted and instal led in a specific portion of the body.
  • each of the module devices 10 may be attached to animals as wel l as humans and be used for location tracking or diagnosis.
  • the tags which are respect ively provided in the module devices 10, may be Radio Frequency (RF) tags , ZigBee tags , Bluetooth tags or infrared tags according to the method of communication with the mobi le communication terminal 20, that is, an RF communicat ion method, a ZigBee communication method, a Bluetooth communicat ion method, or an infrared communication method.
  • RF Radio Frequency
  • di fferent communication technologies may function as RF tags by applying Near Field Communication (NFC) modules , such as ZigBee, Bluetooth, IrDA, Ultra Wide Band (UWB) , or Software Defined Radio (SDR) modules , to a mobi le communication terminal (a master) and a tag (a slave) .
  • NFC Near Field Communication
  • SDR Software Defined Radio
  • FIG. 2 may be configured such that an NFC slave type tag, funct ioning as an RF tag in a master and slave configuration, searches for an unused frequency band and transmits and receives information to and from the mobi le communicat ion terminal , that is, the master , using Cognitive Radio (CR) technology.
  • NFC slave type tag funct ioning as an RF tag in a master and slave configuration
  • CR technology is a communicat ion technology that enables desired communication whi le automat ical ly searching for an unused frequency depending on the locat ion and t ime and protect ing surrounding authorized wireless stat ions in the above-described situat ion, and is current ly under active deve1opment .
  • a general CR chip may be mounted in or on the mobi le communicat ion terminal 20, and may also be mounted on each of the module devices 10.
  • the matching device 40 is a well-known element for data communication in a mobi le communication system, and establ ishes and manages a connect ion to relay data packets between wireless and wired networks.
  • the host computer 50 may a general Internet server . Furthermore, the host computer 50 may separately prepare a wireless Internet page, having a special resolution, for users who connects through a wireless Internet .
  • the terminal 30, which requests a locat ion or biological data, is i l lustrated as a PC, it may be a wireless or wired terminal , such as a mobi le phone or a Personal Digital Assistant (PDA) .
  • the mobi le communication terminal 20 for example, may be implemented in various forms, such as a mobi le phone, a PDA, or a media player having a wireless communication funct ion.
  • FIG. 2 shows the module device 10 according to an embodiment .
  • the module device 10 includes a wireless communication unit 110 for communicating with a tag reader, and an intrinsic information providing unit 130 for providing intrinsic information, which is stored in memory 120, through the wireless communication unit 110 at the request of the tag reader .
  • each of the module devices 10 further includes a biological sensor 170 for detecting a biological signal , and a biological information providing unit 150 for providing the data value of the biological signal detected by the biological sensor 170 at the request of the tag reader .
  • each of the module devices 10 may include a Global Posit ioning System (GPS) chip module (not shown) that receives navigation data from satel l ites, processes the data, acquiring information about the locat ion of its tag, and transmits the information about the location of the tag to the mobi le communication terminal 20 through the wireless communicat ion unit 110.
  • GPS Global Posit ioning System
  • the module device 10 further includes the GPS chip module , the locat ion of the tag can be more accurately detected.
  • the wireless communicat ion unit 110 communicates with the terminal having the tag reader funct ion using various wireless frequency bands of 13.56 MHz , 908.2 MHz, and 914 MHz.
  • the biological sensor 170 may include one of various sensors for detect ing the health of the human body, such as a pressure sensor for sensing the heart rate or blood pressure, a sensor for sensing lung capacity, a temperature sensor for measuring body temperature, a sensor formed of electrodes for measuring a numerical glycosuria value and software, and an accelerat ion sensor for sensing the amount of exercise, or combinat ions thereof .
  • the intrinsic information providing unit 130 provides intrinsic IDent i ficat ion (ID) informat ion about a tag, which has been stored in memory 120, to the terminal through the wireless communicat ion uni t 110.
  • ID intrinsic IDent i ficat ion
  • the biological informat ion providing unit 150 stores data, which is measured by the biological sensor 170, in the memory 120, and provides the biological information to the terminal through the wireless communicat ion unit 110.
  • the biological informat ion providing unit 150 may act ively transmit data in the case where a connect ion with a surrounding terminal is establ ished.
  • a power supply unit 190 is important for actual ly implement ing, in part icular , an RF tag, among various kinds of tags.
  • the RF tag draws a power component from a signal wirelessly transmitted from the terminal , and is thereby suppl ied with power .
  • the module device 10 according to the present invent ion has a very simple construct ion, so that it is possible to guarantee sufficient power using electricity generated using a solar battery cel l , body heat from a human body, or the vibrat ion of the terminal itsel f . Except for housing, no addit ional construct ion, other than the construct ion shown in FIG. 2, is necessary.
  • the module device 10 may be composed of a very smal l-sized Integrated Circuit (IC) , an antenna, simpl i fied circuitry for supplying power , and sensors.
  • IC Integrated Circuit
  • FIG. 3 is a block diagram schemat ical ly showing the construction of the mobi le communication terminal 20 having a tag reader function according to an embodiment of the present invention.
  • the mobi le communication terminal 20 includes a tag communication unit 250 for searching for surrounding tags, establ ishing a connect ion with a found tag, and receiving information from the tag, a remote communicat ion unit 270 for performing data communicat ion with the host computer , and a location informat ion not ification unit 211 for transmitt ing informat ion about the terminal and the intrinsic information of the tag, which is detected by the tag communication unit , to the host computer through the remote communicat ion unit .
  • the tag communication unit 250 performs wireless bidirectional communication with the tag.
  • a communicat ion method corresponding to the type of tag used in the module device 10 is adopted. That is , a Bluetooth communication method is adopted when the RF tag is used in the module device 10, and an infrared communication method is adopted when an infrared communication tag is used.
  • the tag communication unit 250 may include a CR chip module (not shown) , so that a CR chip funct ion can be implemented.
  • the mobi le communicat ion terminal 20 detects the surrounding environment , and determines wireless transmission parameters , such as the frequency, modulat ion mode, and output , so that it enables desired communication whi le automatical ly searching for unused frequencies depending on locat ion and time and protect ing surrounding, permitted wireless station.
  • the tag communication unit 250 In order to establ ish a connection with a tag in a single frequency band, the tag communication unit 250 first authenticates whether the tag is a tag according to the present invention and whether the tag is a forged tag using tag authentication informat ion contained in a signal received from the tag. Thereafter , the tag communication unit 250 assigns communication ID informat i on , whi ch i s necessary in order to establ i sh a connect ion with the tag, to the tag using the intrinsic information. The tag can perform one- to-one communicate with the terminal by transmitting and receiving data using the assigned communication ID informat ion.
  • the mobi le communication terminal can individual ly establish connections with a plural ity of tags that are present in the surrounding area and perform communication with them. Since various protocols associated with such communication technology are already wel l known, a detai led description thereof is omitted.
  • the remote communication unit 270 may employ a mobi le communication protocol , such as Code Division Multiple Access (CDMA) or Global System for Mobi le communication (GSM) , but the present invention is not l imited thereto.
  • the remote communication unit 270 may include various mobi le wireless communicat ion technologies , such as a wireless Local Area Network (LAN) and Bluetooth, that al low connection to the host computer.
  • LAN Local Area Network
  • Bluetooth Bluetooth
  • the location informat ion notification unit 211 transmits the intrinsic informat ion of the tags of respective module devices, which is col lected by the tag communication unit 250, and its locat ion information, thus al lowing the host computer to detect the locations of the module devices.
  • the distances between the terminals and the tags must be short , so that the locations of the module devices can be detected only when informat ion about the locations of the terminals is detected.
  • the information about the terminals which is made known by the locat ion information not i fication unit 211, may, for example, intr insic numbers, such as the phone numbers of mobi le communicat ion terminals.
  • the host computer consults the home locat ion registry of the mobi le communication terminal , which manages the location of each phone number based on a received phone number , thus being capable of acquiring informat ion about the location of a corresponding terminal .
  • the module device 10 transmits exact tag locat ion information to the tag communicat ion uni t 250 , and the locat ion informat ion not i f icat ion uni t 211 transmits the tag location informat ion, not the information about the locat ion of the terminal , which is received from the module device 10, along with the intrinsic informat ion of the tag to the host computer through the remote communication unit 270.
  • the mobi le communicat ion terminal further includes a location detection unit 230 for detect ing the terminal location, and the information about the terminal , which is made known by the locat ion informat ion notificat ion unit 211, may be locat ion information detected by the locat ion detection unit 230.
  • the location detect ion unit 230 may be a module that receives navigat ion data from satel l ites in order to calculate a location and that processes the data, such as a GPS module.
  • the locat ion informat ion includes basic data for calculat ing location coordinates , for example, navigation data, as wel l as coordinate data.
  • the locat ion informat ion noti fication unit 211 periodical ly detects surrounding tags through the tag communication unit 250.
  • the location information notificat ion unit 211 periodical ly wakes up to enter a powered on state and searches for the surrounding tags, thus col lect ing informat ion.
  • the location informat ion noti fication unit 211 detects a tag and transmits its intrinsic informat ion and location informat ion to the host computer 50.
  • the host computer 50 issues an instruct ion for al l mobi le communicat ion terminals 20 to search for the tag having a corresponding intrinsic information.
  • an instruct ion may be universal ly broadcast through the control channel of the mobi le communicat ion terminal .
  • al l the mobi le communicat ion terminals 20 enter a power act ive state and search for the tag having the corresponding intrinsic informat ion.
  • the present invent ion is disclosed in the claims so as to include this embodiment .
  • the mobi le communicat ion terminal further includes a biological informat ion not ificat ion uni t 213 for transmitt ing biological informat ion, which is received through the tag communication unit 250, along with the intrinsic informat ion of the tag to the host computer through the remote communicat ion unit 270.
  • a biological informat ion not ificat ion uni t 213 for transmitt ing biological informat ion, which is received through the tag communication unit 250, along with the intrinsic informat ion of the tag to the host computer through the remote communicat ion unit 270.
  • various pieces of data related to the health of humans or animals can be col lected. These data are combined with the intrinsic information of the tag and transmitted to the host computer , so that the host computer can col lect the data related to the health of the corresponding humans or animals for each transmission t ime point .
  • the mobi le communicat ion terminal may further include a manipulat ion unit 290 for receiving a user' s manipulat ion signal , and a tag registrat ion unit 215 for transmitt ing the intrinsic informat ion of the tag, which is received through the tag communication unit 250, and personal information, which is received through the manipulation unit 290, through the remote communicat ion unit 270 , and registering the user of a corresponding tag.
  • the manipulat ion unit 290 for example, may be a keypad or a touch screen.
  • a tag provider distributes a tag in which only intrinsic informat ion is contained, and a user purchasing or acquiring the tag can convenient ly perform registration using his or her mobi le communicat ion terminal , without having to visit a factory or special shop.
  • the tag user visi ts a speci fic wireless Internet page, performs authent icat ion according to a menu provided on the page, and inputs his or her personal informat ion through the manipulat ion unit 290. Accordingly, the tag, having the corresponding intrinsic informat ion, is matched to a user, and databased.
  • the locat ion information noti fication unit 211, the biological informat ion notificat ion unit 213, are the tag registrat ion unit 215 constitute a control unit 210 that is implemented as a microprocessor and program code executed thereby.
  • FIG. 4 is a block diagram schematical ly showing the system for providing locat ion informat ion according to a preferred embodiment of the present invention.
  • the system for providing locat ion information may be implemented in the host computer 50 using computer programs.
  • the system for providing location informat ion includes a communication unit 510 for connecting with terminals 10 and 30, including a mobi le communication terminal , through networks and performing communication, a location information col lecting unit 531 for receiving the intrinsic informat ion of a tag, which is col lected by the mobi le communication terminal , and terminal information from the mobi le communicat ion terminal , and detecting and storing the location of a corresponding terminal and informat ion about tags surrounding the terminal based on the received informat ion, a location informat ion reading unit 553 for searching data stored by the location informat ion col lecting unit 531, and providing found informat ion to the terminal , in response to a request for provision of informat ion about the locat ion of a specific tag user from the terminal connected to the communication unit 510.
  • the communication unit 510 may be a general wired network interface card for processing Transmission Control Protocol (TCP)/Internet Protocol (IP) communicat ion.
  • the location informat ion col lecting unit 531 col lects data from al l of the mobi le communication terminals.
  • a constant volume of data is stored in the internal memory of each mobi le communication terminal for each time, and the data may be uploaded to the host computer for a longer period.
  • the host computer may cal l al l of the mobi le communication terminals and detect information about the location of a tag having specific intrinsic informat ion in response to a user' s request .
  • the detected data is stored in the locat ion information database 571.
  • the locat ion information database the user' s personal information is managed according to intrinsic number, and the user' s location information is managed according to time.
  • the location information reading unit 531 refers to the locat ion informat ion database 571, extracts informat ion about the locat ion of a tag having corresponding intrinsic informat ion or related to corresponding personal information, and provides the extracted informat ion for reading, in response to a request from the PC 30 that is connected through the communication unit 510.
  • the system for providing locat ion informat ion may further include a extra-regional movement notificat ion unit 535 for setting regions related to the locations of a speci fic tag user at the request of a guardian, monitoring locat ion information stored by the location information col lecting unit , and providing noti fication of movement to the corresponding guardian' s terminal when the user moves out of the set regions.
  • a extra-regional movement notificat ion unit 535 for setting regions related to the locations of a speci fic tag user at the request of a guardian, monitoring locat ion information stored by the location information col lecting unit , and providing noti fication of movement to the corresponding guardian' s terminal when the user moves out of the set regions.
  • the guardian connects to the host computer 50 using his or her PC 30, and may make use of a service for the safety of his or her child.
  • the chi ld possesses a belonging in which a tag is provided.
  • a map for a region set is provided from the host computer 50 to the PC 30, and the guardian inputs his or her chi ld' s normal movement regions on the map using a mouse or the like.
  • the input region data is stored in the location informat ion database 571 according to ward.
  • the location of the tag having speci fic information registered by periodical ly col lected locat ion data, is monitored by the host computer 50.
  • the chi ld moves out of the set region, the corresponding fact is made known to, for example, a mobi le communication terminal that is previously registered by the guardian, using a text message or an automated voice message.
  • the system of providing locat ion informat ion may further include a biological informat ion col lecting unit 551 for receiving biological information corresponding to a tag, which is col lected by a mobi le communication terminal , from the mobi le communication terminal that is connected through the communication unit 510, and the terminal informat ion, and detecting and storing a corresponding terminal user' s biological information based on the received informat ion, and a biological information reading unit 553 for searching data stored by the biological information col lecting unit 551, and providing found information to a terminal , in response to a request for provision of a speci fic tag user' s biological information from the terminal that is connected to the communication unit 510.
  • a biological informat ion col lecting unit 551 for receiving biological information corresponding to a tag, which is col lected by a mobi le communication terminal , from the mobi le communication terminal that is connected through the communication unit 510, and the terminal informat ion
  • the biological information is managed for one or more specific purposes .
  • the quantity of mot ion is calculated based on accelerat ion data col lected for diet management
  • body fat is calculated based on body feature data, such as weight and height
  • bioelectric impedance data are managed for each tag module user .
  • the management of heart disease patients may comprise measuring the intensity of breathing, heart rate, and blood pressure.
  • the col lected biological informat ion may be provided to be read by a corresponding patient or attending physician.
  • the system for providing location informat ion may further include an alarm not ification unit 555 for providing notificat ion of a corresponding fact to a designated terminal through the communication unit when the data stored by the biological informat ion col lecting unit 551 is analyzed and abnormal ity is detected in the human body.
  • the system for providing location information is provided with a special ized system for analyzing the col lected biological data. For example, when the blood pressure and heartbeat data of a specific patient are monitored, notificat ion can be immediately provided to the patient or his or her guardian through a text message or an automated voice message when an abnormal symptom is detected.
  • the system for providing locat ion information may further include a tag registration unit 590 for receiving personal informat ion, which is related to the intrinsic informat ion of the tag, and the user of the tag having intrinsic information from the mobi le communication terminal that is connected through the communication unit 510, registering the user as a new tag user in a database.
  • a tag registration unit 590 for receiving personal informat ion, which is related to the intrinsic informat ion of the tag, and the user of the tag having intrinsic information from the mobi le communication terminal that is connected through the communication unit 510, registering the user as a new tag user in a database.
  • the location information col lecting unit 531, the location information reading unit 533, and the extra-regional movement not i fication unit 535 constitute a locat ion information service unit 530.
  • the locat ion information service unit 530 col lects location informat ion from respect ive RF tags and provides the col lected information for reading. Furthermore, the location information service unit 530 provides supplementary service related to location.
  • the biological informat ion col lecting unit 551, the biological information reading unit 553, and the alarm notificat ion unit 555 constitute a biological informat ion service unit 550.
  • the biological informat ion service unit 550 col lects the biological data of respective tag users from the mobi le communicat ion terminal , and provides supplementary service by processing and outputting it .

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Telephonic Communication Services (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne une technologie conçue pour fournir des informations d'emplacement faisant appel à une étiquette et à un terminal de communication mobile. Ce dernier, selon un aspect de l'invention, se caractérise en ce qu'il recherche des étiquettes environnantes et transmet les données nécessaires de façon que les informations concernant l'emplacement de l'étiquette trouvée puissent être détectées par un ordinateur hôte distant. Selon un autre aspect, le terminal de communication mobile, qui se déplace en fonction de la personne qui le transporte, est utilisé comme station de base pour communiquer avec les étiquettes, ainsi, un module étiquette peut être lui-même mis en oeuvre pour avoir une structure simple et, parallèlement, un emplacement peut être détecté de façon relativement précise. Selon un autre aspect encore, un terminal de communication mobile peut recueillir des données, mesurées par des capteurs biologiques reliés à une étiquette, et transmettre ces données à l'ordinateur hôte distant.
PCT/KR2006/000048 2005-01-06 2006-01-05 Terminal de communication mobile conçu pour communiquer avec une etiquette rf et systeme fournissant des informations d'emplacement utilisant les deux WO2006073274A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2005-0001045 2005-01-06
KR20050001045 2005-01-06
KR10-2005-0030301 2005-04-12
KR1020050030301A KR100554006B1 (ko) 2005-01-06 2005-04-12 태그와 통신하는 이동통신 단말기 및 이들을 이용한위치정보 제공 시스템

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WO2006073274A1 true WO2006073274A1 (fr) 2006-07-13

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PCT/KR2006/000048 WO2006073274A1 (fr) 2005-01-06 2006-01-05 Terminal de communication mobile conçu pour communiquer avec une etiquette rf et systeme fournissant des informations d'emplacement utilisant les deux

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0755927A (ja) * 1993-08-20 1995-03-03 Kokusai Electric Co Ltd 移動体の位置検出システム及びその位置検出方法
KR20030004215A (ko) * 2002-11-26 2003-01-14 전경호 착용자의 위치추적 시스템
KR20040069375A (ko) * 2003-01-29 2004-08-06 윤두희 택을이용한 위치 확인 시스템

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0755927A (ja) * 1993-08-20 1995-03-03 Kokusai Electric Co Ltd 移動体の位置検出システム及びその位置検出方法
KR20030004215A (ko) * 2002-11-26 2003-01-14 전경호 착용자의 위치추적 시스템
KR20040069375A (ko) * 2003-01-29 2004-08-06 윤두희 택을이용한 위치 확인 시스템

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