KR20130136207A - System for presenting location based service using location correction information, apparatus thereof, and method thereof - Google Patents

Abstract

The present invention relates to a system, an apparatus, and a method for providing a location-based service using location correction information. The system of the present invention includes: a service server that stores correction information classified by each time period for correcting location information; and a user terminal that generates contents for providing the location-based service, obtains location information related to the contents, and stores the location information and the time when the location information is obtained. The method of the present invention is characterized in that the user terminal receives, from the service server, correction information corresponding to the time when the location information is obtained among the correction information classified and stored by each time period, and then corrects the location information using the received correction information, or that the service server receives the location information and the time when the location information is obtained together with the contents, and then corrects the location information using correction information corresponding to the time when the location information is obtained among the correction information classified and stored by each time period.

Description

Location-based service providing system using location correction information, apparatus and method therefor {SYSTEM FOR PRESENTING LOCATION BASED SERVICE USING LOCATION CORRECTION INFORMATION, APPARATUS THEREOF, AND METHOD THEREOF}

The present invention relates to a location based service (LBS) technology, and more particularly, to a system for providing a location based service using correction information of a differential global positioning system (DGPS) method, an apparatus therefor and a method therefor. It is about.

Currently, global positioning system (GPS) using satellite is being utilized in various fields due to the development of satellite communication technology. Generally, the position information transmitted from the GPS satellite to the ground-based GPS receiver has a certain error due to various reasons. When two receivers are located at a close distance, the two receivers have a similar error. Differential Global Positioning System (DGPS) information is used to obtain more precise data by canceling the common error of these two receivers.

In view of the foregoing, an object of the present invention is to provide a location-based service, but in order to provide a more precise location-based service, a location-based service providing system capable of providing a more precise location-based service using correction information, and An apparatus and a method therefor are provided.

Another object of the present invention is to provide a system capable of providing a more precise location-based service through the correction information, an apparatus therefor, and a method therefor, even when there is no process for using the correction information in an individual device.

Furthermore, another object of the present invention is to provide a more precise location-based service by correcting the location information using the correction information even after a certain time delay, even if the correction information is not available at the time of using a specific service, An apparatus and a method therefor are provided.

The system for providing a location-based service according to a preferred embodiment of the present invention for achieving the above object is provided with a service server and location-based service for storing a plurality of correction information for correcting the location information by time It includes a user terminal for generating a content for, to obtain location information related to the content, and to store the time to obtain the location information and location information. The user terminal receives correction information corresponding to the time at which the position information is obtained from the plurality of correction information stored separately by the service server by time, and corrects the position information by using the received correction information, or the service server is located The information obtained by receiving the information and the location information is received together with the content, and the location information is corrected using the correction information corresponding to the obtained time of the location information among the plurality of correction information classified and stored for each time.

A user terminal for providing a location based service according to a preferred embodiment of the present invention includes a location information receiver, a communication unit, a broadcast signal receiver, and a controller. The location information receiver receives location information. The communication unit communicates via a wireless network. The receiver receives a broadcast signal through a broadcast network. The control unit generates a content for providing a location-based service, obtains location information related to the content through the location information receiving unit, stores the time for obtaining the location information and the location information, and corrects the location information. Receives correction information corresponding to a time at which position information is obtained from a plurality of correction information divided and stored by time through one of a communication unit or a broadcast signal receiving unit from a service server storing the information by time and storing the received correction information. After correcting the location information by using the content, the content having the corrected location information is provided.

In the user terminal for providing a location-based service according to a preferred embodiment of the present invention, the controller controls the location information by using the correction information corresponding to the time at which the service server obtains the location information from among the plurality of correction information stored and divided by time. To correct, the location information and the time at which the location information is acquired can be transmitted to the service server together with the content.

In the user terminal for providing a location-based service according to a preferred embodiment of the present invention, the correction information includes the position of the reference station or virtual reference station that generated the correction information, the number and correction of the reference station used when the correction information is generated. It may further include an accuracy determined according to the generation method of the information.

In the user terminal for providing a location-based service according to a preferred embodiment of the present invention, the control unit may use correction information according to the accuracy of correction information of at least one virtual reference station adjacent to a location from which location information related to content is obtained. The location information can be corrected by varying the number of reference stations and virtual reference stations.

A service server for providing a location based service according to a preferred embodiment of the present invention includes a communication module, a storage module, and a control module. The communication module performs at least one of communication using a wireless network or communication using a broadcast network. The storage module stores a plurality of pieces of correction information for correcting the position information for each time. When the control module receives the content for providing the location-based service and the time for obtaining the location information and the location information related to the content from the user terminal through the communication module, the time for acquiring the location information among the plurality of correction information stored separately by time Correcting the location information by using the correction information corresponding to the and provides a location-based service through the content having the corrected location information.

In the service server for providing a location-based service according to an embodiment of the present invention, the control module, when requested by the user terminal, corrects the location information of the user terminal and provides the location-based service through the content having the corrected location information. To provide, the communication module may transmit correction information corresponding to a time at which position information is obtained from among a plurality of correction information classified and stored for each time to a user terminal through a wireless network or a broadcast network.

In the method for providing a location-based service of a user terminal according to an embodiment of the present invention, in the content generating service for providing a location-based service, obtains the location information related to the generated content, the location information and location information Storing the obtained time, if the user terminal directly corrects itself, receiving correction information corresponding to a time at which the position information is obtained from among a plurality of correction information stored separately for each time the correction information is generated, and receiving from the service server, Correcting the location information by using the received correction information; and servicing the content having the corrected location information.

After the step of storing in the method for providing a location-based service of the user terminal according to an embodiment of the present invention, if the user terminal itself does not directly correct, the service server is the location information of the plurality of correction information stored by dividing by time The method may further include transmitting the content for providing the location-based service, the location information related to the content, and the time at which the location information is acquired, to the location server to correct the location information by using the correction information corresponding to the obtained time. .

In the method for providing a location-based service of a service server according to an embodiment of the present invention, storing a plurality of pieces of correction information for correcting location information according to time, and when the service server performs correction, the user terminal Receiving a content for providing a location-based service and the location information and the time for obtaining the location information from the content, using the correction information corresponding to the time to obtain the location information of the plurality of correction information divided by time stored Correcting the location information, and providing a location based service through the content having the corrected location information.

In the method for providing a location-based service of a service server according to an exemplary embodiment of the present invention, if the service server does not perform correction after the storing step, the user terminal corrects the location information when requested by the user terminal. In order to provide a location-based service through the content having the corrected location information, a wireless network or a broadcast network may use correction information corresponding to a time when the location information is obtained from a plurality of pieces of correction information classified and stored by time using a communication module. The method may further include transmitting to the user terminal through.

According to the present invention, while providing a location-based service, by correcting the location information related to the location-based service through the DGP type correction information, it is possible to provide a location-based service having more precise location information.

In addition, according to the present invention, even if a user terminal does not have a process for correcting the location information, the service server may correct the location information and provide a location based service based on the corrected location information. Therefore, it is possible to provide a consistent service regardless of the performance of the apparatus.

Furthermore, another object of the present invention is to correct the position information using the correction information even after a certain time delay even if the correction information is not available at the time of using a specific service. Therefore, even if a process does not exist or the location information cannot be corrected in real time due to a network environment or the like, it is possible to provide a precise location based service after another device or a time delay.

1 is a view for explaining a system for providing a location-based service according to an embodiment of the present invention.
2 is a block diagram illustrating a configuration of a service server according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of a user terminal according to an embodiment of the present invention.
4 is a view for explaining a method of generating new correction information using a plurality of reference stations or a virtual reference station according to an embodiment of the present invention.
5 is a flowchart illustrating a method of storing correction information of a service server according to an exemplary embodiment of the present invention.
6 is a flowchart illustrating a method of providing a location based service according to an embodiment of the present invention.
7 is a flowchart illustrating a location-based service providing method according to a first embodiment of the present invention.
8 is a flowchart illustrating a location-based service providing method according to a second embodiment of the present invention.
9 is a flowchart illustrating a method of providing a location based service of a user terminal according to an embodiment of the present invention.
10 is a flowchart illustrating a method of providing a location based service of a service server according to an embodiment of the present invention.

Prior to the detailed description of the present invention, the terms or words used in the present specification and claims should not be construed as limited to ordinary or preliminary meaning, and the inventor may designate his own invention in the best way It should be construed in accordance with the technical idea of the present invention based on the principle that it can be appropriately defined as a concept of a term to describe it. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the elements in the accompanying drawings are exaggerated, omitted, or schematically shown, and the size of each element does not entirely reflect the actual size.

In the embodiment of the present invention, the digital broadcasting or the digital multimedia broadcasting may be DMB (Digital Multimedia Broadcasting), DVB-H (Digital Video Broadcasting-Handheld), MediaFLO Digital Multimedia Broadcasting) will be described as an example. However, those skilled in the art will understand that the broadcast of the present invention can be applied to various types of digital broadcasting or digital multimedia broadcasting. Also, a broadcast channel refers to a channel for transmitting and receiving the digital broadcast.

1 is a view for explaining a system for providing a location-based service according to an embodiment of the present invention.

Referring to FIG. 1, a system according to an embodiment of the present invention includes a plurality of reference stations 100, a collection server 200, a correction server 300, a service server 400, a broadcast transmitter 500, and a user terminal. And 600. In addition, reference numeral 101 denotes a GPS satellite.

Location-based services according to an embodiment of the present invention, in addition to a service whose main purpose is to provide well-known location information in general, in a broader concept, in providing specific content, a service that additionally provides location information Include. The service whose main purpose is to provide location information may be, for example, finding a lost child, finding a friend, navigating while driving, and finding a nearby gas station. Services that additionally provide location information include services that include information about the place (location information) where the photo was taken in the content (photo), and services that include the location (location information) of the restaurant in the restaurant information. It can be illustrated. That is, the location-based service according to an embodiment of the present invention collectively refers to all services that provide "location information" mainly or incidentally. In providing such a location-based service, the present invention corrects the "location information" using the "correction information" of the DGPS method to provide more "precise location information".

In particular, according to an embodiment of the present invention, when correcting the location information, it is possible to provide the location information of the device for providing the location information in a device other than the device for providing the location information. In addition, when correcting the position information, regardless of whether the position information is corrected by a device that provides the position information or when the position information is corrected by a device other than the device that provides the position information, The correction may not be performed immediately after obtaining the correction information. In other words, the positional information may be corrected after an unpredictable time passes. To this end, the device providing the correction information periodically acquires or generates correction information of the DGPS method, and stores the information by dividing it by time. In addition, the apparatus for acquiring position information stores a Coarse / Acquisition code (C / A) code and a time at which the C / A code is acquired when acquiring the position information through a GPS satellite. Therefore, since the correction of the position information uses the C / A code and the correction information corresponding to the time at which the C / A code was acquired among the stored correction information, the position is obtained even after a long time has passed after the position information is acquired. The information can be corrected, and the positional information can be corrected in other devices.

The reference station 100 receives GPS location information transmitted from the GPS satellites 101 through a plurality of installed GPS antennas. Then, the reference station 100 generates correction information using GPS information. Here, the correction information of the reference station includes a position (correction value) for correcting the position of the reference station and the position information (GPS position information). The correction value typically includes a pseudo range correction (PRC). The reference station 100 calculates the difference between the geometric distance from each GPS satellite 101 and the pseudo distance recorded by the GPS C / A code, and this difference becomes the pseudorange correction value PRC. In addition, the correction information may include a range rate correction (RRC). RRC is the adjustment value of the pseudorange correction value based on the prediction rate of the PRC and changes over time. The RRC is a calculated value that should be reflected in the PRC at a certain time, thereby increasing the effectiveness of the PRC over time. Various other factors and parameters may be included in the correction information and basically include all factors and parameters according to the Radio Technical Commission for Maritime Services (RTCM) standard. The reference station 100 periodically generates the correction information and, when the correction information is generated, transmits the generated correction information to the collection server 200. [ This period is preferably as short as possible.

The collection server 200 is for collecting correction information from a plurality of reference stations 100. [ The collection server 200 temporarily collects the correction information of each of the plurality of reference stations 100 through a dedicated line connected to the plurality of reference stations 100 and collects correction information of each reference station 100 And provides the correction information to the correction server 300 via a dedicated line. This is also preferable in accordance with the correction information generation period of the reference station 100. Here, the dedicated line is generally referred to as an Internet line. Also, the collection server 200 is preferably an " Ntrip server ".

The correction server 300 generates correction information of a plurality of virtual reference stations through the correction information of each reference station 100 received from the collection server 200. [ The correction information of the virtual reference station can be obtained according to the position area, the state space area and the measurement area method. The position area method calculates position information based on a single reference station using a plurality of reference station correction information, and calculates an average value of the calculated position information. This method is simple, but it can be less accurate than other methods. In the state space area method, the error is modeled for each error factor using the raw data of the reference station, and the correction information of the virtual reference station is generated using the error. The factors of the GPS position information are structurally the satellite time error, the satellite position error, the ionospheric and convective refraction, the receiver noise, the multipath, and the geometric error, , And other errors due to selective availability (SA). The state space domain approach considers all of these factors. This method has high accuracy but high computational complexity. The measurement area method is a method of calculating correction information of a virtual reference station using correction information of a plurality of reference stations. Representative examples include an inverse distance weighting method and a multiple linear regression method. In addition, when calculating the correction information of the virtual reference station, the correction server 300 may use at least one reference station 100, and when using a large number of reference stations 100, the accuracy is increased. As described above, the correction server 300 generates the correction information of the virtual reference station, and then transmits the correction information of the reference station and the virtual reference station to the service server 400. [ The correction information of the reference station includes a value (correction value) for correcting the position of the reference station and the position information (GPS position information). The correction information of the virtual reference station includes information about the position of the virtual reference station, a value (correction value) for correcting the position information (GPS position information), the number of reference stations used for generating the correction information of the virtual reference station, . Here, the information on the number and the method of the reference station includes the accuracy of the correction information normalized according to the number and the method of the reference station used for generating the correction information. The correction server 300 may be a Regional Area Augmentation System (RAAS) server.

In order to provide a location-based service according to an exemplary embodiment of the present invention, the service server 400 basically includes location information, correction information, and a virtual reference station corresponding to each reference station 100 transmitted by the correction server 300. Receive periodically the position information and the correction information corresponding to, and stores all of this correction information. That is, the service server 400 periodically updates the correction information of the reference station and the virtual reference station so that the position information can be corrected irrespective of the time and subject of the correction of the position information according to the embodiment of the present invention. And store them separately.

In order to provide a location based service according to an exemplary embodiment of the present invention, the user terminal 600 basically receives a GPS signal from the GPS satellite 101 to obtain location information. Here, the location information includes a C / A code (Coarse / Acquisition code or Standard code). In addition, the user terminal 600 together with the position information obtained at the time of obtaining the position information, so that the position information can be corrected regardless of the subject and the time to correct the position information according to an embodiment of the present invention. Save it.

According to the first embodiment of the present invention, in order to provide a location-based service having more precise location information, the user terminal 600 may correct location information. In this case, the user terminal 600 transmits a correction information request message to the service server 400 to request correction information corresponding to the acquired position information (C / A code) and the time at which the position information is obtained. Accordingly, the service server 400 extracts the position information (C / A code) obtained by the user terminal 600 and the correction information corresponding to the time at which the position information is obtained from the stored correction information. That is, the service server 400 may include at least one reference station 100 among a plurality of reference stations 100 and a plurality of virtual reference stations at a location close to the location information (C / A code) obtained by the user terminal 600. Alternatively, the correction information of the virtual reference station is extracted, and correction information generated at a time closest to the obtained time is extracted from at least one reference station or correction information of the virtual reference station. In this case, the correction information may be provided by extracting correction information of the plurality of reference stations 100 or the virtual reference stations. The number of the reference station 100 or the virtual reference station provided as the correction information may be determined by a request of the user terminal 400 or may be determined by a predetermined number at the service server 400. In this case, the extracted correction information of the reference station 100 or the virtual reference station is in the order that the distance between the position information (C / A code) acquired by the user terminal 600 and the reference station 100 or the virtual reference station is close. Selected sequentially. As described above, the service server 400 extracting the correction information is provided to the user terminal to correct the position information.

When providing the correction information to the user terminal 600, the service server 400 may be provided through a broadcast network or may be provided through a wireless network. When the service server 400 provides the correction information through the wireless network, the service server 400 may transmit correction information to the user terminal 600 through a base station or an access point (AP). In addition, when the service server 400 transmits the correction information through a broadcast channel, the service server 400 can provide the transport information in a TPEG (Transport Protocol Expert Group) format. At this time, the service server 400 transmits correction information to the DGI (Differential GPS-information) message according to an embodiment of the present invention. The DGI message is a type of TPEG message. The service server 400 may include the DGI message including the correction information in the data broadcast signal and provide the DGI message to the user terminal 600 through the broadcast transmitter 500. [

According to the second embodiment of the present invention, in order to provide a location-based service having more precise location information, the location information may be corrected at the service server 400. In this case, the user terminal 600 transmits the location information (C / A code) and the time at which the location information is acquired along with the content for providing the location-based service. Then, the service server 400 corrects the position information by using the position information (C / A code) obtained by the user terminal among the stored correction information and the correction information corresponding to the time at which the position information is obtained, and corrected position information. Through the services of location-based services.

2 is a block diagram illustrating a configuration of a service server according to an embodiment of the present invention.

Referring to FIG. 2, the service server 400 includes a communication module 410, a storage module 420, and a control module 430.

The communication module 410 is means for transmitting and receiving data of each kind according to the embodiment of the present invention. The communication module 410 receives the correction information of the DGPS method according to the embodiment of the present invention from the correction server 300 and transmits it to the control module 430. The communication module 410 periodically receives the correction information of the reference station 100 and the virtual reference station from the correction server 300. [ The correction information of the reference station includes a value (correction value) for correcting the position of the reference station and the position information (GPS position information). The correction information of the virtual reference station includes information on the number and the method of the reference station used when generating the correction information of the virtual reference station, a value (correction value) for correcting the position of the virtual reference station, the position information Information (accuracy of the normalized correction information). The communication module 410 may also receive a correction information request message requesting at least one specific correction information from the user terminal 600. In response, the communication module 410 may receive a correction information response message including corresponding correction information from the control module 430 and transmit the received correction information response message to the user terminal 600.

When providing the correction information to the user terminal 600, the communication module 410 may be provided through digital broadcasting or through a wireless network. When transmitting the correction information through a broadcast channel, the communication module 410 may provide a transport protocol expert group (TPEG) format, and may include the correction information in a high precision positioning information (DGI) message to transmit the correction information. have. At this time, the communication module 410 may include the DGI message including the correction information in the data broadcasting signal and provide the DGI message to the user terminal 600 through the broadcast transmitter 500. When providing the correction information through the wireless network, the communication module 410 may provide the user terminal 600 with a correction information response message including the correction information to the user terminal 600 through the base station or the AP.

The storage module 420 basically stores correction information. The correction information includes correction information of the reference station and correction information of the virtual reference station. The correction information of the reference station includes a value (correction value) for correcting the position of the reference station and the position information (GPS position information). The calibration information of the virtual reference station includes the position of the virtual reference station, a value for correcting the position information (GPS position information) (correction value), and the number and method of the reference station used when generating the calibration information of the virtual reference station. Contains information. The information on the number and manner of reference stations includes the accuracy of the normalized correction information determined according to the number and manner of reference stations used when generating the correction information of the virtual reference station. For example, the accuracy of the normalized correction information may have a value from 0 to 1, and the higher the value, the higher the accuracy. Further, assuming that correction information of the virtual reference station can be generated based on 1 to 18 reference stations, when the correction information of the virtual reference station is generated based on one or two reference stations, the accuracy is 0.1. When the correction information of the virtual reference station is generated based on 17, 18 or 18 reference stations, the accuracy may be 0.9 and the accuracy of the reference station 100 may be 1. As described above, the correction information of the virtual reference station can be obtained according to the position domain, the state-space domain, and the measurement domain. In this case, The accuracy obtained according to the area method is the lowest, and the accuracy obtained according to the state space area method may be the highest. Also, the accuracy obtained according to the measurement area method is intermediate between the accuracy of the position area method and the state space area method. In the measurement area method, correction information of a virtual reference station can be obtained by an inverse distance weighting method, a polynomial linear regression method, and the accuracy according to the polynomial linear regression method is set to be higher than the accuracy according to the inverse distance weighting method. In this way, the accuracy of the correction information of the virtual reference station can be determined by at least one of the number of reference stations used when generating the correction information for the virtual reference station and the correction information generation method (or method) thereof.

The control module 430 receives correction information of the reference station and the virtual reference station so that the position information may be corrected regardless of a subject and a time for correcting the position information through the communication module 410, and the storage module 420 may receive the correction information. Controls to save all by time.

When the control module 430 receives the correction information request message including the time for obtaining the location information (CA code) and the location information from the user terminal 600 through the communication module 410 according to the first embodiment, Generates a correction information response message including position information (CA code) acquired by the user terminal among the correction information stored in the storage module 420 and correction information corresponding to the time at which the position information is obtained, and generates the generated correction information response message It provides to the user terminal through the communication module 410. Meanwhile, when the control module 430 provides the correction information to the user terminal 600, the control module 430 may provide the correction information through digital broadcasting. In this case, the control module 430 may include correction information in a differential GPS-information (DGI) message of a Transport Protocol Expert Group (TPEG) format and transmit the correction information through the communication module 410. At this time, the communication module 410 may include the DGI message including the correction information in the data broadcasting signal and provide the DGI message to the user terminal 600 through the broadcast transmitter 500.

The control module 430, according to the second embodiment, communicates the time for obtaining the location information (C / A code) and the location information together with the content for providing the location-based service from the user terminal 600. When received through the), the position information is corrected by using the position information (C / A code) obtained by the user terminal among the correction information stored in the storage module 420 and the correction information corresponding to the time at which the position information was obtained. The content of the location-based service may be serviced through the corrected location information.

3 is a block diagram illustrating a configuration of a user terminal according to an embodiment of the present invention.

Referring to FIG. 3, the user terminal 600 may be a standalone device operating by itself. This can be exemplified by a mobile communication terminal, a smart phone, a camera, a video camera, and the like.

The user terminal 600 includes a location information receiving unit 610, a broadcast signal receiving unit 620, a communication unit 630, an input unit 640, an output unit 650, a storage unit 660, and a control unit 670.

The position information receiving unit 610 is for receiving position information from a plurality of GPS satellites. This position information includes a C / A code. The location information receiving unit 610 receives the location information and transmits the received location information to the controller 670.

The broadcast signal receiving unit 620 receives the data broadcast signal. The data broadcast signal includes a DGI message including correction information. The broadcast signal receiver 620 can extract the DGI message from the broadcast signal and extract the correction information by decoding the extracted DGI message. Then, the extracted correction information is transmitted to the control unit 670.

The communication unit 630 is for communicating through a wireless network. The communication unit 630 may transmit the correction information request message from the control unit 670 to the service server 400. In addition, the communication unit 630 may receive a correction information response message from the service server 400. Then, the communication unit 630 transmits the received correction information response message to the control unit 670.

The input unit 640 may include a plurality of input keys and function keys for receiving numeric or character information and setting various functions, as means for receiving at least one of a command, selection, data, and information of a user. The input unit 640 senses a key input of the user and transmits an input signal corresponding to the sensed key input to the control unit 670. The input unit 640 may be an input device such as a keyboard, a keypad, a mouse, a joystick, and the like.

The output unit 650 is a means for outputting information generated according to the use of the user terminal 600 so that the user can recognize the information through visual, auditory, or tactile sense. In particular, the output unit 650 may output the content for the location-based service according to an embodiment of the present invention. The output unit 650 may include a display device for outputting visual information, an audio device for outputting auditory information, a haptic device for outputting tactile information, and the like. The display device may be a touch screen. When the display device is formed in the form of a touch screen, the display device may perform some or all of the functions of the output device 640. An audio device may represent a speaker typically. The haptic device may be a motor or the like that outputs vibration.

The storage unit 660 is an apparatus for storing data, and includes a main storage device and an auxiliary storage device. The storage unit 660 may store an operating system (OS), a firmware, an application, or the like. In addition, the storage unit 660 may store various kinds of data generated according to the use of the user terminal 600 of the user. In particular, the storage unit 660 may store content, location information, time, etc. for providing a location-based service according to an embodiment of the present invention. Each kind of data stored in the storage unit 660 can be deleted, changed, or added according to a user's operation.

The controller 670 basically generates content for providing a location based service. In this case, the content providing the location-based service includes location information. In order to provide such location information, the controller 670 obtains location information through the location information receiver 610 and stores the acquired location information and the time at which the location information is acquired in the storage unit 660. In addition, the controller 670 may receive the correction information through the broadcast signal receiving unit 620 or the communication unit 630 to correct the position information. In particular, the control unit 670 transmits a correction information request message for requesting correction information corresponding to the acquired position information and the time at which the position information is obtained to the service server 400 through the communication unit 630, and the corresponding correction. Information can be received. In particular, when the controller 670 requests correction information, the controller 670 may request correction information of the plurality of reference stations 100 or the virtual reference stations. The correction information of the reference station includes a value (correction value) for correcting the position and position information (GPS position information) of the reference station, and the correction information of the virtual reference station is the position and position information (GPS position information of the virtual reference station). ) And information (correction of the normalized correction information) about the number and method of the reference station used when generating the correction value (correction value) and the correction information of the virtual reference station.

In particular, the controller 670 may vary the number of reference stations and virtual reference stations for which correction information is used according to the accuracy of correction information of at least one virtual reference station adjacent to the location of the current user terminal 600, thereby providing location-based services. Correct the location information of the content to provide. For example, if the value of the accuracy of the at least one adjacent virtual reference station in the order nearest to the current position is higher than the preset reference, the controller 670 may correct the correction information of the one virtual reference station closest to the current user terminal 600. Use only to correct GPS location information. On the other hand, if the accuracy of the correction information of the virtual reference station around the location information (location) of the content is lower than the preset reference, based on the at least one virtual reference station in the order nearest to the location information of the content, the controller 670. ) Varies depending on the accuracy of the number of reference stations and virtual reference stations used for correction. That is, when the GPS position information is corrected, the control unit 670 uses the correction information of a larger number of reference stations and virtual reference stations as the accuracy of the correction information is lower. When the controller 670 confirms the accuracy of the correction information of the adjacent virtual reference station for correction, the number of adjacent virtual reference stations referred to may vary depending on the setting. In addition, when the number of reference stations 100 is different, the value of accuracy as a reference may also vary depending on the setting.

In addition, when the controller 670 corrects the position information of the content by using the plurality of virtual reference stations and the correction information of the reference station 100, the reference station 100 or the virtual station is located from the position information (position) of the content. Depending on the distance to the reference station, the accuracy of the correction information of the reference station 100 or the virtual reference station, weights may be generated to generate new correction information, and the GPS position information may be corrected using the newly generated correction information. .

For example, FIG. 4 is a diagram for describing a method of generating new correction information using a plurality of reference stations or a virtual reference station, according to an embodiment of the present invention. Referring to FIG. Represents the first virtual reference station and the second virtual reference station, the location information (location) 4 of the content for providing location-based services is the reference station 100, the first virtual reference station 110 and the second virtual reference. It may be corrected using the correction information of the station 130. At this time, it is assumed that the correction information of the reference station 100, the first virtual reference station 110, and the second virtual reference station 130 are K, L, and M, respectively. In addition, it is assumed that the accuracy of the reference station 100, the first virtual reference station 110, and the second virtual reference station 130 is 1, 0.7, and 0.3, respectively. The distances from the position information (position) 4 of the content to the reference station 100, the first virtual reference station 110 and the second virtual reference station 130 are assumed to be a, b, and c, respectively. Then, the newly generated correction information is expressed by Equation (1) below.

As shown in Equation (1), the newly generated correction information has a higher weight and a higher weight in proportion to the accuracy. As described above, the controller 670 generates new correction information by using a larger number of virtual reference stations or reference stations 100 according to the accuracy of the virtual reference station located near the current position, and uses the same. By correcting the location information (location) 4 of the content, it is possible to provide a location-based service having more accurate location information. In particular, the present invention can provide a location-based service having location information that maintains a certain level or more of accuracy.

5 is a flowchart illustrating a method of storing correction information of a service server according to an exemplary embodiment of the present invention. The storage of the correction information to be described in FIG. 5 is repeated at a predetermined period, which is to use the correction information corresponding to the time when the user terminal receives the position information.

Referring to FIG. 5, in step S505, the reference station 100 receives GPS location information transmitted from the GPS satellite 101 through a plurality of installed GPS antennas, and generates correction information using the GPS location information in step S510. do. Subsequently, the reference station 100 transmits the correction information generated in step S515 to the collection server 200.

Accordingly, the collection server 200 collects correction information of each of the plurality of reference stations 100 at once through a dedicated line connected to the plurality of reference stations 100, and corrects each of the reference stations 100 in step S520. Information is provided to the correction server 300 through a dedicated line. At this time, the correction information is mapped to each reference station 100 and transmitted.

The calibration server 300 having received the reference information of each reference station 100 and each reference station 100 receives the correction information of the plurality of virtual reference stations through the reference station 100 and the correction information mapped thereto in step S525. Create

After the calibration server 300 generates the calibration information of the virtual reference station, in step S530 the position information (position of the reference station) and the correction information corresponding to each reference station 100, the position information corresponding to each virtual reference station Transmit the calibration information (the location of the virtual reference station). At this time, in the case of the virtual reference station, when generating the correction information of the virtual reference station, information on the number and method of the used reference station 100 are transmitted together.

The service server 400 receiving the above-described information from the calibration server 300 stores the correction information of the reference station 100 and the correction information of the virtual reference station in operation S535. At this time, the correction information of the reference station 100 and the correction information of the virtual reference station are mapped and stored with the time when the reference station 100 acquires the correction information. This is to use the correction information corresponding to the time at which the user terminal receives the position information.

A method of providing a location-based service through the stored correction information will now be described.

6 is a flowchart illustrating a method of providing a location based service according to an embodiment of the present invention.

"Location-based service" according to an embodiment of the present invention refers to a service provided based on location information when a user terminal and entities on a network connected to the network provide a service to a user. Location-based services, according to embodiments of the present invention, are generally not limited to providing current location information, navigation functions, or services that provide a location for a particular destination. For example, if the user terminal 600 is a camera or a smartphone having a camera function, the location-based service, when taking a picture through the user terminal 600, together with the picture, provides a location where the picture was taken together It can be a service.

In particular, the present invention provides a location-based service, in order to provide the location information more precisely, to correct the location information using the correction information of the DGPS method, and provides the location-based service through the corrected location information. That is, if there is a request for location-based service from the user, the location-based service system acquires location information to provide location-based service in step S610, and stores the obtained location information and time at which the location information is obtained. Here, the location information may be a GPS CA code, whereby the time is a time when the GPS CA code is received. Then, the location-based service system corrects the location information using the correction information corresponding to the time at which the location information was obtained in step S620. This correction information uses what is stored in the manner as described above in FIG. Then, the location-based service system provides the location-based service using the corrected location information in step S630.

In the embodiment of the present invention, the correction of the location information may be performed by the user terminal 600 or by the service server 400. In addition, the correction of the position information may be performed immediately after obtaining the position information, or may be performed with a certain time delay. This may vary depending on the location of the user terminal 600 and the network environment. For this reason, the present invention maps and stores the correction information of the reference station 100 or the virtual reference station to the time when the correction information is generated, and stores the time when the position information is obtained. Therefore, the corresponding location information may be corrected by a device other than the device (for example, the user terminal) that acquired the location information, and the location information may be corrected after a certain time elapses rather than immediately after the location information is acquired. Can be.

7 is a flowchart illustrating a location-based service providing method according to a first embodiment of the present invention. In FIG. 7, a process of directly correcting location information by the user terminal 400 is described. Here, it is assumed that the user terminal 600 is a smartphone, and the location-based service provides a picture including location information, for example.

The service server 400 continuously stores the correction information at a predetermined cycle in the method as described in FIG. 5 at step S700. According to a user's manipulation, the user terminal 600 may detect an event for requesting a location-based service in operation S705. For example, the user may press the shutter to take a picture with his user terminal 600.

Then, the user terminal 600 generates the content of the location-based service in step S710. For example, take a picture and save it. In this case, the user terminal 600 obtains location information necessary to provide the location-based service in step S715, and stores the location information and the time at which the location information is obtained. Here, the location information may be a GPS CA code.

Then, the user terminal 600 transmits a correction information request message to the service server 400 to correct the position information previously obtained in step S720 using the wireless network (S715). The correction information request message includes position information necessary to provide a location based service and a time at which the position information is obtained.

When the service server 400 receives the correction information request message, the service server 400 may provide correction information corresponding to the received correction information request message. That is, the service server 400 extracts the correction information corresponding to the position information (GPS CA code) and the time at which the position information was obtained in operation S725 from the previously stored correction information, and includes the extracted correction information response. Send a message to the user terminal 600.

The user terminal 600 corrects the previously obtained position information through the correction information received in step S730. For example, the position information at the time of taking a picture is corrected through the correction information. Then, the user terminal 600 provides a location based service according to the corrected location information in step S735. For example, a photo including the corrected position information is provided.

Meanwhile, the above-described steps S720 and S725 are described as requesting and receiving correction information from the service server 400 by using the wireless network. As an alternative to this procedure, the service server 400 may transmit correction information to the user terminal 600 through a broadcast network.

In addition, the above-described steps S720 to S730 may be delayed due to network reasons. However, in this case, the user terminal 400 stores the obtained location information and the time at which the location information is obtained, and at any time, regardless of the time delay, after requesting the correction information from the service server 400, the location By receiving correction information corresponding to the time at which the information was obtained, the positional information can be corrected.

8 is a flowchart illustrating a location-based service providing method according to a second embodiment of the present invention. In FIG. 8, the service server 400, rather than the user terminal 600, is a description for explaining a process of correcting location information. Here, it is assumed that the user terminal 600 is a smart phone, and the location-based service, for example, posts a photo including location information on a web page. Accordingly, the service server 400 may also perform a function of a web server that stores web pages.

The service server 400 continuously stores the correction information at a predetermined cycle in the method as described in FIG. 5 at step S800. According to a user's manipulation, the user terminal 600 may detect an event for requesting a location-based service in step S805. For example, the user may press the shutter to take a picture with his user terminal 600.

Then, the user terminal 600 generates the content of the location-based service in step S810. For example, take a picture and save it. In this case, the user terminal 600 obtains the location information necessary to provide the location-based service in step S815, and stores the location information and the time at which the location information is acquired are mapped with the generated content. For example, the location information at which the picture was taken and the time at which the picture was taken (or the time at which the location information was obtained) are stored together with the picture. Here, the location information may be a GPS CA code.

Then, the user terminal 600 transmits the content (picture) to which the time at which the location information was obtained and the location information previously stored in step S820 is mapped to the service server 400 using the wireless network.

The service server 400 receiving the content to which the location information and the time at which the location information is obtained is mapped, extracts the correction information corresponding to the time at which the location information is acquired from the correction information stored in step S825, and the location mapped to the corresponding content. Correct the information.

Then, the service server 400 provides a location based service according to the corrected location information in step S830. For example, a picture including the corrected location information is posted on a web page.

Meanwhile, as another example corresponding to FIG. 8, a method of providing a location based service will be described. Here, the location-based service is assumed to be a friend finder, for example.

The service server 400 continuously stores the correction information at a predetermined cycle in the method as described in FIG. 5 at step S800. The user terminal 600 may detect an event for requesting a location-based service in step S805. For example, it detects that a request for location information of the user terminal 600 is received from a third terminal (not shown) used by a friend of the user.

Then, the user terminal 600 generates the content of the location-based service in step S810. For example, content (at least part of an electronic map) for visually providing a current location of the user terminal 600 is generated. In addition, the user terminal 600 obtains the location information necessary to provide the location-based service in step S815, and stores the location information and the time obtained by mapping the location information with the content. For example, the current location information and the picture together with the electronic map are stored together with the time at which the location information is acquired. Here, the location information may be a GPS CA code.

Thereafter, the user terminal 600 transmits the content (electronic map) to which the time at which the location information is stored and the time at which the location information is obtained is mapped to the service server 400 in step S820.

The service server 400 receiving the content to which the location information and the time at which the location information is acquired is mapped, extracts the correction information corresponding to the time at which the location information is acquired from the correction information stored at step S825, and then the corresponding content (electronic map). Correct location information mapped to.

Subsequently, the service server 400 provides the location based service according to the corrected location information in operation S830. For example, the service server 400 may transmit an electronic map including the current position of the user terminal 600 corrected according to the correction information, to the third terminal. This process can be applied to finding lost children.

9 is a flowchart illustrating a method of providing a location based service of a user terminal according to an embodiment of the present invention.

Referring to FIG. 9, the user terminal 600 detects a location based service request of a user in operation S900. Then, the user terminal 600 generates content for providing a location-based service in step S905. At the same time, the user terminal 600 obtains location information (eg, GPS CA code) necessary for providing location-based services in step S910, and maps and stores content, location information, and time.

Next, the user terminal 600 determines whether the user terminal 600 itself corrects the position information in step S915. If the user corrects the location information, the flow proceeds to step S920. If not, proceed to step S940. Steps S920 to S935 correspond to the embodiment of FIG. 7, and step S940 corresponds to the embodiment of FIG. 8.

In operation S920, the user terminal 600 transmits a correction information request message to the service server 400 to correct the location information using the wireless network. The correction information request message includes position information necessary to provide a location based service and a time at which the position information is obtained. Then, the service server 400 will provide correction information corresponding to the received correction information request message. That is, the service server 400 extracts the correction information corresponding to the position information (GPS CA code) and the time at which the position information is obtained from the previously stored correction information, and the user receives a correction information response message including the extracted correction information. Will transmit to terminal 600. Accordingly, the user terminal 600 receives the correction information response message in step S925. Then, the user terminal 600 corrects the position information of the content through the correction information received in step S930. Then, the user terminal 600 provides a location-based service through the content having the location information corrected in step S935.

Meanwhile, in operation S940, the user terminal 600 transmits, to the service server 400, the content in which the location information previously obtained and the time at which the location information is obtained are mapped using the wireless network. Accordingly, the service server 400 receiving the content to which the location information and the time at which the location information is obtained is mapped, extracts the correction information corresponding to the time at which the location information is obtained from the stored correction information, and stores the location mapped to the corresponding content. After calibrating the information, the service server 400 will then provide the location based service according to the calibrated location information.

10 is a flowchart illustrating a method of providing a location based service of a service server according to an embodiment of the present invention.

Referring to FIG. 10, it is assumed that the service server 400 continuously stores correction information at a predetermined period according to the method described above with reference to FIG. 5 at step S1000.

In operation S1005, the service server 400 may request a correction information request message including a time for obtaining location information and location information from the user terminal 600 or a location-based service including time for obtaining location information and location information. Receive content for providing.

When the correction information request message is received, the process proceeds to step S1010. When the content itself is received, the process proceeds to step S1020.

In operation S1010, the service server 400 extracts position information (GPS CA code) of the received correction information request message and correction information corresponding to a time at which the position information is obtained, from previously stored correction information. Then, the service server 400 transmits a correction information response message including the correction information extracted in step S1015 to the user terminal 600.

In operation S1020, the service server 400 extracts correction information corresponding to a time at which the location information of the content is obtained from the previously stored correction information. Then, the service server 400 corrects the location information of the content using the extracted correction information in step S1025. Subsequently, the service server 400 provides a location based service using content whose location information is corrected in step S1030.

It has been described that the collection server 200, the correction server 300, and the service server 400 are implemented as independent devices, respectively, and perform unique functions. However, at least two of the collection server 200, the correction server 300, and the service server 400 may be implemented in one device, or may be implemented in different devices as described in the embodiment . In addition, some or all of the functions described as being performed by the servers 200, 300, and 400 may be performed by servers 200, 300, and 400 other than the server. As a representative example, the correction server 300 may perform some or all of the functions performed by the service server 400, and the service server 400 may perform some or all of the functions of the correction server 300 .

The location information providing method according to an embodiment of the present invention may be implemented in a form of a program readable by various computer means and recorded in a computer-readable recording medium. Here, the recording medium may include program commands, data files, data structures, and the like, alone or in combination. Program instructions to be recorded on a recording medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. For example, the recording medium may be a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical medium such as a CD-ROM or a DVD, a magneto-optical medium such as a floppy disk magneto-optical media, and hardware devices that are specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. Such a hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been described with reference to several preferred embodiments, these embodiments are illustrative and not restrictive. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.

100: base station 200: collection server
300: correction server 400: service server
410: communication module 420: storage module
430: Theft information module 500: Broadcasting transmitter
600: User terminal 610: Position information receiver
620: broadcast signal receiving unit 630:
640: input unit 650: output unit
660: storage unit 650: control unit

Claims (11)

In the system for providing a location-based service,
A service server for classifying and storing a plurality of correction information for correcting location information for each time; And
And a user terminal generating content for providing the location-based service, obtaining location information related to the content, and storing the location information and the time at which the location information is obtained.
The user terminal receives correction information corresponding to the time at which the position information is obtained from the plurality of correction information stored separately by the service server by time, and corrects the position information by using the received correction information;
The service server receives the location information and the time at which the location information is acquired together with the contents, and uses the correction information corresponding to the time at which the location information is obtained from the plurality of pieces of correction information classified and stored for each time. A system for providing location based services, characterized in that to calibrate information. In the user terminal for providing a location-based service,
A position information receiving unit for receiving position information;
A communication unit for communication via a wireless network;
A broadcast signal receiver for receiving a broadcast signal through a broadcast network; And
A plurality of contents for generating the location-based service, obtaining location information related to the content through the location information receiving unit, storing time for obtaining the location information and the location information, and correcting location information; Receiving correction information corresponding to a time at which the position information is obtained from a plurality of correction information classified and stored for each time through one of the communication unit or the broadcast signal receiving unit from a service server that stores the correction information for each time by And a controller configured to correct the location information by using the received correction information, and to provide the content having the corrected location information. 3. The method of claim 2,
The control unit
The contents of the time information and the location information obtained by the service server to correct the location information by using the correction information corresponding to the time of obtaining the location information of the plurality of stored correction information divided by time; The user terminal for providing a location-based service, characterized in that for transmitting to the service server. 3. The method of claim 2,
The correction information is
The position of the reference station or the virtual reference station that generated the correction information;
And a precision determined according to the number of reference stations used when the correction information is generated and a generation method of the correction information. 5. The method of claim 4,
The control unit
According to the accuracy of the correction information of at least one virtual reference station adjacent to the position from which the position information related to the content is obtained, the position information is corrected by varying the number of the reference station and the virtual reference station where the correction information is used. User terminal for providing a location-based service. In the service server for providing location-based services,
A communication module for performing at least one of communication using a wireless network or communication using a broadcast network;
A storage module for classifying and storing a plurality of correction information for correcting the position information for each time; And
When the content for providing the location-based service, the location information related to the content, and the time for obtaining the location information are received from the user terminal through the communication module, the location information is obtained from a plurality of correction information classified and stored for each time. And a control module for correcting the location information using the correction information corresponding to one hour and providing the location based service through the content having the corrected location information. Service server. The method according to claim 6,
The control module
In response to a request from the user terminal, the user terminal corrects the location information and provides the location-based service through the content having the corrected location information. The service server for providing a location-based service, characterized in that for transmitting the correction information corresponding to the time when the position information obtained from the correction information to the user terminal via a wireless network or a broadcast network. In the method for providing a location-based service of the user terminal,
Generating content for providing location-based service, obtaining location information related to the generated content, and storing time for obtaining location information and location information;
When the user terminal directly corrects itself, correction information corresponding to the time at which the position information is obtained is obtained from the plurality of correction information classified and stored for each time when the correction information is generated, and the received correction information is used. Correcting the location information; And
And servicing the content with the corrected location information. The method of claim 8, wherein after the storing step:
If the user terminal itself does not directly correct,
Content for providing the location-based service, a location related to the content such that the service server corrects the location information by using correction information corresponding to a time at which the location information is obtained from a plurality of pieces of correction information stored separately by time. And transmitting the information and the time at which the location information is obtained, to the service server. In the method for providing a location-based service of the service server,
Storing a plurality of pieces of correction information for correcting the position information for each time;
When the service server performs correction, receiving content for providing the location-based service, location information related to the content, and a time for acquiring the location information from a user terminal;
Correcting the position information by using correction information corresponding to a time at which the position information is obtained among a plurality of correction information classified and stored for each time; And
Providing the location based service through the content having the corrected location information. The method of claim 10,
After the storing step,
If the service server does not perform the correction,
In response to a request from the user terminal, the user terminal corrects the location information and provides the location-based service through the content having the corrected location information. Transmitting correction information corresponding to a time at which the position information is obtained from the correction information to the user terminal through a wireless network or a broadcasting network; and providing the location-based service of the service server. .

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