KR20200112004A - Method and apparatus for estimating position of terminal - Google Patents

Abstract

The present invention is to provide a method of measuring a location of a terminal that can accurately estimate the location of the terminal in an indoor space, and an apparatus for the same. According to an embodiment of the present invention, provided is a method of measuring a location of a terminal by a location measurement device. The method may comprise the steps of: receiving identification information of an access point (AP) connected to a terminal from the terminal; detecting location information of the AP corresponding to the identification information, location information of at least one light generating device, and an identifier of the light generating device; acquiring first reception information on a radio signal of the AP from the terminal, wherein the first reception information includes information on a signal reception direction and a signal reception strength of the radio signal; acquiring second reception information for a visible light signal emitted from the light generating device from the terminal, wherein the second reception information includes information on the identifier of each light generating device and a signal reception strength for each identifier; and estimating a location of the terminal based on the first reception information and the second reception information.

Description

A method for measuring the location of a terminal and an apparatus therefor {METHOD AND APPARATUS FOR ESTIMATING POSITION OF TERMINAL}

The present invention relates to a method for measuring a location of a terminal and an apparatus therefor, and more particularly, to a method for measuring a location of a terminal and an apparatus therefor capable of accurately estimating the location of a terminal indoors.

The Internet is evolving from a human-centered connection network in which humans create and consume information, to an Internet of Things (IoT) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technological elements such as sensing technology, wired/wireless communication and network infrastructure, service interface technology, and security technology are required, and recently, a sensor network for connection between objects, machine to machine , M2M), and MTC (Machine Type Communication) technologies are being studied.

In the IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is the field of smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliance, advanced medical service, etc. through the convergence and combination of existing IT (information technology) technology and various industries. Can be applied to.

Meanwhile, various location-based services are being received using the location information of the terminal. Location estimation in an indoor environment includes recognition of the location of the terminal and route guidance in a large building or shopping mall, setting a zone that can be connected to a specific device, server, etc., and access security, location guidance to vehicles parked in a large parking lot, disasters such as fire or support When this occurs, it can be used in a variety of ways, such as rescue of isolated lives in large buildings. In general, a location estimation method using a satellite-based positioning system (GPS) is mainly used, but a GPS receiver has a problem that it cannot stably receive GPS satellite signals in an indoor environment.

Accordingly, recently, in an indoor environment, a location measurement technique using a wireless LAN (WLAN), which is already installed in a large number, has been attracting attention in order to reduce the mobile communication load. However, since most indoor wireless communication uses an omni-directional antenna, it is difficult to measure the orientation, and to solve this problem, the location of the terminal is estimated by measuring and merging the movement of a specific terminal and the change in distance between the terminals in the communication process. However, in this method, it is necessary to move one or more terminals, and there is a problem that it is difficult to calculate an accurate azimuth angle because the change in distance between the terminals before and after the movement is measured using received signal strength (RSS).

The present invention was conceived to solve the above problems, and the present invention is a method for measuring a location of a terminal capable of accurately estimating the location of a terminal in an indoor space based on a user's action, a visible light signal, and/or an acoustic signal, and It aims to provide a device.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the present invention, a method of measuring a location of a terminal by a location measuring apparatus is provided. The method comprises the steps of: receiving identification information of an access point (AP) connected to the terminal from a terminal; Detecting location information of the access point corresponding to the identification information, location information of at least one light generating device, and an identifier of the light generating device; Acquiring first reception information on the radio signal of the access point from the terminal, the first reception information including information on a signal reception direction and a signal reception strength of the radio signal; Acquiring second reception information on the visible light signal emitted from the light generating device from the terminal-The second reception information includes information on the identifier of each light generating device and signal reception strength for each identifier -; It may include the step of estimating the location of the terminal based on the first received information and the second received information.

Preferably, the identification information may be received by the terminal from the access point connected to the terminal and transmitted to the location measuring device.

Also preferably, the step of acquiring the first received information comprises: transmitting a predetermined action request to the terminal-The action request allows the user to point a predetermined reference point to the terminal It is a request to make-; Receiving information about the azimuth angle of the terminal when indicating the reference point from the terminal and the signal reception strength of the radio signal; And calculating the signal reception direction based on the azimuth angle of the terminal.

In addition, preferably, further comprising the step of detecting the location information of the reference point corresponding to the identification information, the step of calculating the signal reception direction, based on the azimuth angle of the terminal and the location information of the reference point Can be done.

In addition, preferably, the reference point is the same as the location of the access point, and the action request may be a request for the user to shoot the access point to the terminal.

Also preferably, the step of estimating the location of the terminal may include: estimating a first location of the terminal based on the access point based on the first received information and location information of the access point; Estimating a second location of the terminal based on the access point based on the second reception information, location information of the access point, and location information of each of the light generating devices; And determining the location of the terminal by comparing the first location and the second location.

Also, preferably, in the step of determining the location of the terminal, if the direction of the second location based on the access point is within a predetermined range from the direction of the first location, the second location is set to the terminal. If it is determined as the location of and is out of the range, the first location may be determined as the location of the terminal.

Also preferably, the second reception information may further include information on the posture of the terminal.

Also preferably, obtaining third reception information for the first sound signal emitted from the at least one sound generating device from the terminal-The third reception information is information about the second sound signal received from the terminal Including -; In the step of estimating the location of the terminal, the environment surrounding the terminal by comparing the first acoustic signal and the second acoustic signal based on the third received information of the terminal Can be further estimated.

According to an embodiment of the present invention, a computer-readable recording medium in which a program for performing the method is recorded is provided.

According to the present invention, it is possible to accurately estimate the location of a terminal in an indoor space based on a user's action, a visible light signal, and an acoustic signal without the need for movement of another terminal in the indoor space.

Brief description of each drawing is provided in order to more fully understand the drawings cited in the detailed description of the present invention.
1 shows a system for measuring a location of a terminal according to an embodiment of the present invention.
2 shows a terminal in a system for measuring a location of a terminal according to an embodiment of the present invention.
3 illustrates a location measurement apparatus in a location measurement system of a terminal according to an embodiment of the present invention.
4 shows a method of measuring a location of a terminal according to an embodiment of the present invention.
5 shows an embodiment of step S430 of FIG. 4.
6 shows an embodiment of step S450 of FIG. 4.
7 and 8 are conceptual diagrams for explaining exemplary operations of a system for measuring a location of a terminal according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs an understanding of the embodiment of the present invention, a detailed description thereof will be omitted. In addition, embodiments of the present invention will be described below, but the technical idea of the present invention is not limited thereto or is not limited thereto, and may be modified and variously implemented by those skilled in the art.

Throughout the specification, when a part is said to be "connected" with another part, this includes not only "directly connected" but also "indirectly connected" with another element interposed therebetween. . Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term.

1 shows a system for measuring a location of a terminal according to an embodiment of the present invention.

Referring to FIG. 1, the position measurement system 1000 includes at least one access point (AP), at least one light generating device 20, at least one sound generating device 30, and at least one It may include a terminal 100 and a location measuring device 200. For reference, each of the blocks shown in FIG. 2 are exemplary components for describing the location measurement system 1000, and an additional component not shown in FIG. 1 may also be included in the location measurement system 1000.

The access point 10 may refer to a wireless communication device constituting an interconnection point between the wireless communication network and the terminal 100. The access point 10 may include a repeater, a base station, and the like, and preferably, may be a beacon, Wi-Fi, Bluetooth, or a ZigBee communication repeater. In addition, here, the wireless communication network may include 3G, 4G, Wi-Fi, BT (Blue Tooth), NFC (Near Field Communication), Zigbee (Xbee), and UWB (ultra-wide band). In the location measurement system 1000 according to the present invention, the access point 10 is composed of at least one, can be installed in at least one area constituting an indoor space such as a building, and is assigned to each access point 10. Identification information including a unique ID (identification) may be delivered to the terminal 100 located in a wireless communication coverage region. In addition, the access point 10 may include a directional antenna.

The light generating device 20 may emit visible light signals each having a different identifier. For example, the light-generating device 20 may be implemented using a digital light-emitting device such as an LED emitting visible light, and the digital light-emitting device is switched on/off or the intensity is modulated. By doing so, the visible light signal emitted from the light generating device 20 can contain information about an identifier for identifying them and output. At least one light generating device 20 may be implemented and may be spaced apart from each other at a predetermined interval within the coverage area of the access point 10.

The sound generating device 30 may continuously change and emit sound signals of a plurality of frequencies. These frequencies may belong to the inaudible frequency band between 18k and 20kHz, for example. In one embodiment, the sound generating device 30 may be implemented through a speaker device.

Meanwhile, according to an embodiment, the light generating device 20 and the sound generating device 30 may be installed at the same position as the access point 10, or may be physically implemented as one device.

The terminal 100 is a subject that accesses the access point 10 using wireless communication, and can perform, for example, a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a communication function. It may include a multimedia system and the like. In the present invention, when a user carries such a terminal 100, enters into the coverage area of a predetermined access point 10 and accesses the access point 10, identification information of the access point 10 is transmitted to the terminal 100. ), and may transmit such identification information to the location measurement device 200 through a user's authentication request. In addition, the terminal 100 receives a visible light signal from the surrounding light generating device 20, and transmits its identifier and information on the signal reception strength for each identifier to the position measuring device 200, or the sound generating device 30 An acoustic signal may be received from and information about this may be transmitted to the position measuring apparatus 200.

The location measurement device 200 may refer to a computing device such as a server operated by a business operator or an administrator providing a location measurement service. The location measurement device 200 receives identification information such as a unique ID from the terminal 100, and the access point 10 to which the terminal 100 is connected, its location information, and the access point 10 exist in the installation area. At least one light generating device 20 and its location information may be identified, and the location of the terminal 100 may be estimated. For example, the location measurement device 200 transmits an action request to the terminal 100 for pointing a user to a predetermined reference point, and in response thereto, the corresponding reference point from the terminal 100 When the terminal 100 instructs, the azimuth angle of the terminal 100 and the signal reception strength of the radio signal are received, and the first position of the terminal 100 within the coverage area of the access point 10 can be estimated based on this. have. In addition, for example, the position measuring apparatus 200 acquires reception information (identifier of a visible light signal and signal reception strength for each identifier) regarding at least one visible light signal from the terminal 100, and based on this, second position information Is estimated, and the location of the terminal 100 may be determined by comparing the first location and the second location with each other according to a predetermined criterion.

2 shows a terminal in a system for measuring a location of a terminal according to an embodiment of the present invention.

3, the terminal 100 includes a communication unit 110, a sensor unit 120, a photographing unit 130, a light receiving unit 140, an acoustic receiving unit 150, a storage unit 160, and a control unit 170. ) Can be included. For reference, it will be apparent that the units shown in FIG. 2 correspond to exemplary units of the terminal 100, and thus additional units may be further provided.

The communication unit 110 is configured to transmit and receive information with an external device (access point 10, location measuring device 200, etc.) using various wired/wireless communication methods, and includes a Wi-Fi chip, a Bluetooth chip, a wireless communication chip, and NFC. Includes at least one of the chips. In particular, in the present invention, the communication unit 210 is connected to the access point 10 through wireless communication, and may transmit the identification information received from the access point 10 to the location measurement device 200. In addition, the communication unit 210 may receive an action request from the location measuring apparatus 200 and transmit information about the azimuth angle and signal strength of the terminal 100 in response thereto. In addition, the communication unit 210 is a position measuring device 200, the identifier of the visible light signal received from the light generating device 20 and / or the signal reception strength of each identifier, information about the sound signal received from the sound generating device 30 Can be delivered to.

The sensor unit 120 is a component that detects at least one physical quantity existing within a preset range. For example, an acceleration sensor that detects acceleration according to the force applied to a moving object or the gravitational acceleration of a stationary object, a geomagnetic sensor that detects the direction by detecting the flow of a magnetic field, and a movement by detecting the rotational speed. A gyro sensor used to detect an object, an infrared ray sensor (IR) that detects infrared light emitted from an object (not shown in the drawing), acceleration according to the force applied to a moving object, or It may include at least one of an acceleration sensor that detects acceleration due to gravity and an atmospheric pressure sensor that detects the intensity of applied air pressure. In particular, in the present invention, the sensor unit 120 may measure an azimuth angle indicated by the terminal 100.

The photographing unit 130 is a component that performs a photographing operation according to a user manipulation, and may be configured to include a camera module or the like.

The light receiver 140 may receive a visible light signal emitted from at least one light generating device 140 and measure a signal reception strength. The light receiving unit 140 may be implemented through a photodiode, an illuminance sensor, or the like, and according to an embodiment, the photographing unit 130 may function as the light receiving unit 140.

The sound receiver 150 may receive sound signals emitted from at least one sound generating device 140. The sound receiving unit 150 may be implemented through, for example, a microphone module.

The storage unit 160 may store a program for performing an operation of the terminal, data according to the operation, and the like.

The control unit 170 includes a CPU, a ROM in which a control program for controlling the terminal is stored, and a RAM used as a storage area for storing signals or data input from the outside of the terminal or for operations performed in the terminal, Other components of the terminal can be controlled.

Meanwhile, although not shown in FIG. 2, the terminal 100 may further include an input unit. The input unit is for an interface between the device and the user, and may include a key, a touch panel, a pen recognition panel, and the like. When a key, a touch panel, a pen recognition panel, or the like is pressed, a corresponding control command is generated and transmitted to the control unit 170, and the control unit 170 may control the operation of the terminal according to the corresponding control command.

Meanwhile, although not shown in FIG. 2, the terminal 100 may further include a display unit. The display unit may be configured as a touch screen that displays information on various applications (eg, call, data transmission, broadcast, camera, etc.) that can be executed by the control unit 170 and provides a user interface adapted thereto. For example, the controller 270 may select a soft key displayed on the touch screen or execute an application or function corresponding to the soft key in response to a user gesture detected on the touch screen. The user gesture includes a touch by a finger or an apparatus, motion recognition by a human body, and the like.

3 illustrates a location measurement apparatus in a location measurement system of a terminal according to an embodiment of the present invention.

Referring to FIG. 3, the position measuring apparatus 200 may include a communication unit 210, a database unit 220, and a control unit 230. For reference, it will be apparent that the units shown in FIG. 3 correspond to exemplary units of the position measuring apparatus 200, and thus additional units may be further provided.

The communication unit 210 is directly connected to the outside (for example, at least one terminal 100 and/or access point 10, the light generating device 20, or the sound generating device 30) or connected through a network As provided for, it may be a wireless communication unit 210. Specifically, the communication unit 210 transmits data from the control unit 230 and the database unit 220 by wire or wirelessly, or receives data from the outside by wire or wirelessly and transmits the data to the control unit 230 or the database unit 220 ). The data includes identification information of the access point 10 and location information corresponding thereto, location information of the reference point, azimuth angle of the reference point of the terminal 100, information on the reception strength of the radio signal, and the light generating device 20 ) Information about each location information and/or an identifier of a visible light signal emitted therefrom, a signal reception strength of a visible light signal, and the like may be included. The communication unit 210 includes LTE (Long Term Evolution), WiBro (Wireless Broadband Internet), RF (Radio Frequency) communication, Wireless LAN, Wi-Fi (Wireless Fidelity), NFC (Near Field Communication), Bluetooth , Infrared, Zigbee (Xbee) communication can be communicated. However, this is exemplary, and various wireless communication technologies applicable in the art may be used according to an embodiment to which the present invention is applied.

The database unit 220 may store various data accompanying the operation of the position measuring apparatus 200. The data includes identification information of the access point 10 and location information corresponding thereto, location information of a reference point, azimuth angle of the reference point of the terminal 100, information on signal reception strength for a radio signal, and a light generating device ( 20) Information about each location information and/or an identifier of a visible light signal emitted therefrom, a signal reception strength of a visible light signal, etc. may be included, but is not limited thereto. The database unit 220, as known to a person skilled in the art, includes a hard disk drive (HDD), a read only memory (ROM), a random access memory (RAM), an electrically erasable and programmable read only memory (EEPROM), and a flash memory. flash memory), CF (Compact Flash) card, SD (Secure Digital) card, SM (Smart Media) card, MMC (Multimedia) card or memory stick, etc. It may be, and may be provided inside the device 200 or may be provided in a separate device.

The controller 230 may perform a data processing function of controlling the overall operation of the position measuring apparatus 200 and a signal flow between internal components thereof, and processing data.

Specifically, when the identification information is received from the terminal 100, the control unit 230 provides the location information of the access point 10 and the reference point corresponding thereto, the location information of the light generating device 20, and the visible light emitted therefrom. The identifier, etc. of may be detected from the database unit 220. In addition, the control unit 230 transmits a predetermined action request to the terminal 100 through the communication unit 210, and in response, when the azimuth angle and the received signal strength of the reference point of the terminal 100 are received, based on this As a result, the direction of signal reception of the terminal 100 for the access point 10 may be calculated. In addition, the control unit 230 determines the control of the terminal 100 within the coverage area of the access point 10 based on the calculated signal reception direction of the radio signal, the location information of the access point 10, and the signal reception strength of the radio signal. 1 Can estimate the location In addition, the controller 230 estimates the second location of the terminal 100 based on the location information of the light generating device 20 and the signal reception strength of visible light signals for each identifier, and the first location or The second location may be finally determined as the location of the terminal 100.

Meanwhile, although not shown in FIG. 3, the location measuring apparatus 200 may further include an input unit. The input unit may input various data by a user (or an administrator) of the location measuring apparatus 200. The user input unit may use various input devices applicable in the art, such as keys, touch panels, and switches.

In addition, although not shown in FIG. 3, the position measuring apparatus 200 may further include a display unit. The display unit may display an image or data provided from the controller 230 on a screen, and may provide a user interface for a user's input required for the operation of the position measuring apparatus 200. The display may be formed of a liquid crystal display (LCD), organic light emitting diodes (OLED), active matrix organic light emitting diodes (AMOLED), or the like.

4 shows a method of measuring a location of a terminal according to an embodiment of the present invention, and FIG. 5 shows an embodiment of step S430 of FIG. 5.

In step S410, the location measuring apparatus 200 may receive identification information of a predetermined access point 10 from the terminal 100. Here, the identification information is an ID that corresponds to each access point 10 and is uniquely assigned. For example, it may be composed of letters, numbers, codes, a combination thereof, or in an encrypted form, and the terminal 100 and It may be transmitted to the terminal 100 from the access point 10 connected through wireless communication. That is, each access point 10 transmits its identification information to the terminal 100 connected through wireless communication within the coverage area, and the terminal 100 transmits this identification information together with an authentication request for its location. The identification information may be transmitted to the location measuring device 200.

In step S420, the location measurement device 200 includes location information of the access point 10 corresponding to the received identification information, and the location of at least one light generating device 20 existing in the installation area of the access point 10 Information and identifiers of each of the light generating devices 20 can be detected. For example, the location measurement apparatus 200 may search the database unit 220 to detect a unique access point 10 corresponding to the received identification information and location information thereof. In this case, the location information of the access point 10 may include identification information on the installation area of the access point 10, data obtained by coordinated the location of the access point 10 within the installation area.

In addition, for example, the position measurement device 200 searches the database unit 220, and at least one light generating device 20 and its object located in the installation area of the access point 10 corresponding to the identification information Position information and an identifier for identifying a visible light signal emitted from each of the light generating devices 20 may be detected. At this time, the location information of the light generating device 20 is data that coordinates the location of the light generating device 20 in the installation area of the access point 10 corresponding to the identification information, and the relative position data with the access point 10 (Distance, angle, etc.) may be included.

Meanwhile, in step S420, the location measuring apparatus 200 may further detect location information for a predetermined reference point corresponding to the identification information received from the terminal 100. This reference point is a reference point for calculating the signal reception direction of the access point 10 and the terminal 100, which will be described below, and the location information of the reference point is each access point 10 and their identification. In response to the information, it may be stored in the database unit 220 of the location measuring apparatus 200. Such location information may include data coordinated with the corresponding location within the installation area of the access point 10 and/or location data (distance, angle, etc.) relative to the access point 10.

In step S430, the location measuring apparatus 200 may obtain first reception information of the terminal 100 for a wireless signal at the access point 10. In this case, the first reception information may include information on a signal reception direction and a signal reception strength of the radio signal.

In one embodiment, step S430 may include steps S431 to S433, as shown in FIG. 5.

In step S431, the location measuring apparatus 200 may transmit a predetermined action request to the terminal 100. Here, the action request may be a request that causes the user to point the terminal 100 to a reference point. As described above, when the terminal 100 indicates the reference point, the position measuring apparatus 200 estimates the signal reception direction of the terminal 100 based on the azimuth angle of the terminal 100.

In one embodiment, this reference point may be the same as the location of the access point 10. In this case, the action request in step S434 may be a request that causes the user to photograph the access point 10 with the terminal 100. That is, the location measuring apparatus 200 may cause the terminal 100 to indicate the access point 10 as a reference point by requesting an action that causes the user to photograph the access point 10.

In step S432, in response to transmission of the action request, the location measurement apparatus 300 may receive information on the azimuth angle and signal reception strength of the terminal 100 when indicating a reference point from the terminal 100. Here, the azimuth angle may refer to an angle formed by a direction in which the terminal 100 faces with respect to magnetic north (ie, a direction in which the top or the back of the terminal faces).

In step S433, the location measurement apparatus 200 may calculate a signal reception direction based on the location information of the reference point, the location information of the access point 10, and information about the azimuth angle of the terminal 100. That is, for example, when the reference point is the same as the position of the access point 10, 180° is added to or subtracted from the azimuth angle of the terminal 100 when indicating the access point 10 to the access point 10. It is possible to calculate the signal reception direction of the terminal 100 for.

The position measuring apparatus 200 may estimate the first position of the terminal 100 based on the signal reception direction and the reception strength of the radio signal.

In step S440, the location measuring apparatus 200 may obtain second reception information for a visible light signal emitted from the light generating device 20 from the terminal 100. Here, the second reception information may include information on an identifier of each light generating device 20 and a signal reception intensity (ie, a reception intensity or illuminance of a visible light signal) for each identifier. In addition, in an embodiment, the second received information may further include information about the posture of the terminal 100 (eg, tilt). By applying a triangulation or the like based on the signal reception strength for each identifier, the location measurement apparatus 200 may estimate the second location of the terminal 100.

In addition, in step S440, the position measuring apparatus 200 may further obtain third reception information for the first acoustic signal emitted from at least one sound generating device 30. Here, the third reception information may include information on the second sound signal received from the terminal 100. That is, the first sound signal emitted from the sound generating device 30 is attenuated or amplified due to the influence of the surrounding environment and received through the sound receiving unit 150 of the terminal 100, and the terminal 100 2 It is possible to transmit an acoustic signal to the position measuring device 200. Based on this second acoustic signal, the location measuring apparatus 200 may estimate the environment around the terminal 100.

In step S450, the location measuring apparatus 200 may estimate the location of the terminal based on the first received information and the second received information.

In one embodiment, step S450 may include steps S451 to S453, as shown in FIG. 6.

In step S451, the location measuring apparatus 200 may estimate the first location of the terminal 100 based on the access point 10 based on the first received information for the radio signal. That is, the position measuring apparatus 200 calculates the distance between the access point 10 and the terminal 100 based on the signal reception strength, and corresponds to the signal reception strength in the signal reception direction from the coordinates of the access point 10 It may be implemented to calculate a location spaced apart by a distance as the first location of the terminal 100 within the coverage area of the access point 10.

In step S452, the position measuring apparatus 200 may estimate the second position of the terminal 100 based on the access point 10 based on the second received information for the visible light signal. That is, the location measurement device 200 is based on the location information of the light generating device 20, the identifier of the visible light signal emitted from each of the light generating devices 20, and the signal reception strength calculated for each identifier. And converting the corresponding location based on the access point 10 to estimate the second location of the terminal 100. Meanwhile, in an embodiment, before estimating the second position, the position measurement apparatus 200 may be implemented to correct the signal reception strength for at least one identifier based on information about the posture of the terminal 100.

In step S453, the location measuring apparatus 200 may determine the location of the terminal 100 by comparing the first location and the second location.

In one embodiment, if the direction of the second position based on the access point 10 is within a predetermined range from the direction of the first position, the position measuring apparatus 200 determines the second position of the terminal 100. It is determined as a location, and if out of this range, the first location may be determined as the location of the terminal 100.

That is, in the case of the first position estimated through the wireless communication signal, the direction based on the access point 10 is calculated based on the azimuth angle of the terminal 100 regardless of the wireless communication signal. There is a possibility that the signal is modulated or distorted due to obstacles around the distance from 10). On the other hand, in the case of the second position estimated through the visible light signal, although it is common to accurately estimate the position of the terminal 100 because at least one visible light signal having straightness is used, the attitude of the terminal 100 (or It is difficult to completely exclude the case where the position of the terminal 100 is accurately estimated because all or part of the visible light signal of at least a part of the light generating device 20 is blocked due to tilt) or the like.

In consideration of this point, in the present invention, if the direction of the second position falls within a predetermined range from the direction of the first position calculated based on the azimuth angle of the terminal 100, the position estimation through a visible light signal is properly made. The reporting second location may be finally determined as the location of the terminal 100, and if not, it may be implemented to determine that the first location as the location of the terminal 100, assuming that part or all of the visible light signal is blocked.

Meanwhile, although not shown in FIG. 6, in an embodiment, step S450 may further include estimating the surrounding environment of the terminal 100 based on the third received information. That is, the position measurement device 200 compares the first sound signal emitted from the sound generating device 30 and the second sound signal received from the terminal 100 to determine whether the signal is altered, such as attenuation or amplification of the signal. By determining, it is possible to estimate whether or not there is an obstacle around the terminal 100.

6 and 7 are conceptual diagrams for explaining an exemplary operation of a system for measuring a location of a terminal according to an embodiment of the present invention.

6 to 7, the operation of the position measurement system 1000 is summarized as follows.

First, while the access point 10 installed in a predetermined area inside a building, etc., is broadcasting identification information including its ID, the user carrying the terminal 100 When the terminal 100 and the access point 10 are connected to each other by entering the coverage area of the wireless communication of 10), the identification information of the access point 10 is transmitted to the terminal 100.

Subsequently, the user may request location authentication by transmitting the identification information of the access point 10 to the location measurement device 200 through the terminal 100, and the location measurement device 200 may use the identification information according to the authentication request. The location information of the corresponding access point 10, the location information and the identifier of at least one light generating device 20 existing in the installation area of the access point 10 may be detected.

Subsequently, the location measuring apparatus 200 may transmit a predetermined action request to the terminal 100. In this case, the action request may be, for example, a request that causes the user to photograph the access point 10 with the terminal 100. Accordingly, the terminal 100 instructs the access point 10 as a reference point for calculating the signal reception direction.

Subsequently, the terminal 100 determines the azimuth angle and the signal reception strength with the access point 10 when such an action is performed (ie, when the access point 10 is indicated by the terminal 100). In response to this, the location measurement device 200 may calculate a signal reception direction of the terminal 100 for the access point 10.

For example, when the location of the access point 10 is the reference point, if the azimuth angle of the first terminal 100-1 located in the coverage area is 145° (magnetic north is 0°, clockwise angle), the position is measured. The device 200 may calculate a signal reception direction of the terminal 100 as 325° (180° + 145°) based on the access point 10. In addition, for example, when the location of the access point 10 is a reference point, if the azimuth angle of the second terminal 100-2 located in the coverage area is 300°, the position measuring apparatus 200 is the terminal 100 The signal reception direction of can be calculated as 120˚ (-180˚+300˚) based on the access point 10.

Subsequently, the terminal 100 receives the visible light signal emitted from the nearby light generating device 20 through a camera module, etc., and determines the identifier of the received visible light signal and the information on the signal reception strength for each identifier. It may be transmitted to 200, and according to an embodiment, in addition to this, information (tilt, etc.) about the posture of the terminal 100 may be further transmitted to the position measuring apparatus 200.

Subsequently, the location measuring apparatus 200 may estimate the first location of the terminal 100 based on the location information of the access point 10, a signal reception direction, and a signal reception strength. That is, the position measuring apparatus 200 calculates the distance between the access point 10 and the terminal 100 based on the signal reception strength, and corresponds to the signal strength in the signal reception direction from the coordinates of the access point 10 The location separated by the distance is estimated as the first location of the terminal 100.

Subsequently, the location measuring device 200 estimates the second location of the terminal based on the access point 10 based on the location information of the light generating device 20 corresponding to the received identifier, signal reception strength for each identifier, etc. , By comparing the direction of the first location and the direction of the second location, the first location or the second location may be finally determined as the location of the terminal.

In the above, the above has been described on the premise that the signal reception direction of the terminal 100 is calculated using the access point 10 as a reference point, but the reference point is an arbitrary position in the area where the access point 10 is installed (for example, It can be changed in various ways, such as the entrance of the room. In this case, the signal reception direction is the location of the reference point and/or the distance to the access point 10, the distance between the access point 10 and the terminal 100 calculated in response to the signal strength, and the terminal when indicating the reference point. It can be calculated by applying a trigonometric function to the azimuth angle of (100).

Meanwhile, the various embodiments described in the present specification may be implemented by hardware, middleware, microcode, software, and/or a combination thereof. For example, various embodiments include one or more application specific semiconductors (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs). ), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions presented herein, or a combination thereof.

Further, for example, various embodiments may be embodied or encoded on a computer-readable medium containing instructions. Instructions embodied or encoded on a computer-readable medium may cause a programmable processor or other processor to perform a method, for example, when the instructions are executed. Computer-readable media includes computer storage media. The storage medium may be any available medium that can be accessed by a computer. For example, such computer-readable media may be RAM, ROM, EEPROM, CD-ROM or other optical disk storage medium, magnetic disk storage medium or other magnetic storage device, or instructions accessible by the computer for the desired program code or It may include any other medium that can be used to store in the form of data structures.

Such hardware, software, firmware, and the like may be implemented within the same device or within separate devices to support the various operations and functions described herein. Additionally, components, units, modules, components, and the like described as "units" in the present invention may be implemented together or separately as interoperable logic devices. The description of different features for modules, units, etc. is intended to highlight different functional embodiments, and does not necessarily imply that they must be realized by separate hardware or software components. Rather, functionality associated with one or more modules or units may be performed by separate hardware or software components or may be integrated within common or separate hardware or software components.

Although the operations are shown in the figures in a specific order, it should not be understood that these operations are performed in the specific order shown, or in a sequential order, or that all illustrated operations need to be performed to achieve the desired result. . In any environment, multitasking and parallel processing can be advantageous. Moreover, the division of various components in the above-described embodiments should not be understood as requiring such division in all embodiments, and the described components are generally integrated together into a single software product or packaged into multiple software products. It should be understood that you can.

As described above, an optimal embodiment has been disclosed in the drawings and specifications. Although specific terms have been used herein, these are used only for the purpose of describing the present invention, and are not used to limit the meaning or the scope of the present invention described in the claims. Therefore, those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (10)

In the method for measuring the location of the terminal by the location measuring device,
Receiving identification information of an access point (AP) connected to the terminal from a terminal;
Detecting location information of the access point corresponding to the identification information, location information of at least one light generating device, and an identifier of the light generating device;
Acquiring first reception information on the radio signal of the access point from the terminal, the first reception information including information on a signal reception direction and a signal reception strength of the radio signal;
Acquiring second reception information on the visible light signal emitted from the light generating device from the terminal-The second reception information includes information on the identifier of each light generating device and signal reception strength for each identifier -;
And estimating a location of the terminal based on the first received information and the second received information. The method of claim 1,
The identification information is received by the terminal from the access point connected to the terminal and transmitted to the location measuring device. The method of claim 1,
Acquiring the first received information,
Transmitting a predetermined action request to the terminal-the action request is a request that causes the user to point a predetermined reference point to the terminal -;
Receiving information about the azimuth angle of the terminal when indicating the reference point from the terminal and the signal reception strength of the radio signal; And
Comprising the step of calculating the signal reception direction based on the azimuth angle of the terminal. The method of claim 3,
Further comprising the step of detecting location information of the reference point corresponding to the identification information,
The calculating of the signal reception direction is performed based on an azimuth angle of the terminal and location information of the reference point. The method of claim 3,
The reference point is the same as the location of the access point,
The action request is a request that causes the user to photograph the access point with the terminal. The method of claim 1,
The step of estimating the location of the terminal,
Estimating a first location of the terminal based on the access point based on the first received information and location information of the access point;
Estimating a second location of the terminal based on the access point based on the second reception information, location information of the access point, and location information of each of the light generating devices; And
Determining a location of the terminal by comparing the first location and the second location. The method of claim 6,
In the step of determining the location of the terminal,
If the direction of the second position based on the access point is within a predetermined range from the direction of the first position, the second position is determined as the position of the terminal, and if out of the range, the first Determining the location as the location of the terminal. The method of claim 1,
The second reception information further includes information about the posture of the terminal. The method of claim 1,
Acquiring third reception information about a first sound signal emitted from at least one sound generating device from the terminal, the third reception information including information about a second sound signal received from the terminal; Including more,
In the step of estimating the location of the terminal, further estimating the surrounding environment of the terminal by comparing the first acoustic signal and the second acoustic signal based on the third received information of the terminal. A computer-readable recording medium on which a program for performing the method according to any one of claims 1 to 9 is recorded.

Images