KR20160025997A - Apparatus for providing location information corrected by using location correction information and method thereof - Google Patents

Apparatus for providing location information corrected by using location correction information and method thereof Download PDF

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Publication number
KR20160025997A
KR20160025997A KR1020140113566A KR20140113566A KR20160025997A KR 20160025997 A KR20160025997 A KR 20160025997A KR 1020140113566 A KR1020140113566 A KR 1020140113566A KR 20140113566 A KR20140113566 A KR 20140113566A KR 20160025997 A KR20160025997 A KR 20160025997A
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South Korea
Prior art keywords
channel
correction information
information
position correction
receiving
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KR1020140113566A
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Korean (ko)
Inventor
방성민
지정희
홍성수
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주식회사 지어소프트
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Priority to KR1020140113566A priority Critical patent/KR20160025997A/en
Publication of KR20160025997A publication Critical patent/KR20160025997A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/40—Correcting position, velocity or attitude

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

Abstract

The present invention relates to an apparatus for providing location information corrected by location correction information and a method thereof. The apparatus for providing corrected location information comprises: a broadband communication unit for receiving location correction information through a first channel using a base station of a communication network; a near field communication unit for receiving the location correction information through a second channel using an access point of the communication network; a broadcast receiving unit for receiving the location correction information through a third channel using a broadcast transmitting unit of the radio network; and a location information module, connecting one of the channels among a first, a second and a third channel, receiving the location correction information through the connected channel, and transmitting the received corrected location information to a location information receiving unit to correct the location information by using the received location correction information.

Description

[0001] Apparatus and method for providing corrected position information using position correction information [0002] Apparatus for providing location information corrected by using location correction information and method [

More particularly, the present invention relates to an apparatus and method for providing corrected position information using position correction information received through a broadcasting network and a communication network.

Currently, global positioning system (GPS) using satellite is being utilized in various fields due to the development of satellite communication technology. Generally, GPS information transmitted from a satellite to a GPS receiver on the ground has a certain error due to various causes. If two receivers are located at a distance from each other, the two receivers have a similar error. Differential Global Positioning System (DGPS) information is used to obtain more precise data by offsetting the common errors of these two receivers.

Korean Patent Publication No. 2010-0077560 Published on July 08, 2010 (Name: High-Precision Location Information Transmission System and Reception System Utilizing Terrestrial DMB)

It is an object of the present invention to provide an apparatus and method for providing corrected position information using position correction information capable of selectively receiving position correction information through a plurality of channels.

According to an aspect of the present invention, there is provided an apparatus for providing corrected position information using position correction information, the apparatus comprising: a position information receiver for receiving position information; A local communication unit for receiving position correction information through a second channel using an access point of a communication network, and a third channel using a broadcasting transmitter of the broadcasting network, A channel selection unit for selecting one of the first, second, and third channels to connect to the broadcast receiving unit, receiving the position correction information through the connected channel, and receiving the position correction information using the received position correction information, And a position information module for transmitting the received position correction information to the position information receiving unit.

The position information module selects another channel and receives the position correction information if the strength of the received signal of the position correction information received through the selected channel is less than a preset threshold value.

And the position information module receives the position correction information by selecting another channel if the reception period of the position correction information received through the connected channel is longer than a preset threshold value.

And the position information module receives another position information from the other channel if the receiving period of the position correction information received through the connected channel is longer than the position information request period of the currently executed application.

And the position information module receives the position correction information by selecting another channel when the state satisfying the channel change condition set for changing the connected channel is maintained for a predetermined holding time.

Here, the holding time satisfies the following equation.

The holding time of the first channel> the holding time of the third channel> the holding time of the second channel

The selection of another channel is performed according to a predetermined priority, and a priority is set according to a data usage fee charged when a channel is used, or a priority is set according to a service coverage for providing a channel. do.

According to another aspect of the present invention, there is provided a method of providing corrected location information using location correction information, the method comprising: receiving a request for location information from an executed application; Receiving position correction information through a first channel using an access point of a communication network, a second channel using an access point of a communication network, and a third channel using a broadcast transmitter of a broadcasting network; Correcting the information, and providing the corrected position information to the application.

According to the present invention as described above, it is possible to select any one of a plurality of channels by using both the communication network and the broadcasting network, receive the position correction information, change to another channel according to the channel state, . Therefore, even when the channel environment of a certain channel is poor, for example, in a shadow area, it is possible to receive the position correction information stably through another channel. Therefore, the reliability of the service providing the highly precise position information corrected through the position correction information can be increased.

1 is a view for explaining a position correction information providing system according to an embodiment of the present invention.
2 is a diagram illustrating a channel selection method of a user equipment according to a service coverage according to an embodiment of the present invention.
3 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.
4 is a flowchart illustrating a method of providing location information according to an embodiment of the present invention.
FIGS. 5A and 5B are views for explaining a method of changing position correction information of a second format into position correction information of a first format and providing the same.
6 is a flowchart illustrating a method of changing a channel for receiving position correction information according to the first embodiment of the present invention.
7 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a second embodiment of the present invention.
8 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a third embodiment of the present invention.
9 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a fourth embodiment of the present invention.
10 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a fifth embodiment of the present invention.
11 is a flowchart for explaining a method of changing a channel for receiving position correction information according to the sixth embodiment of the present invention.
12 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a seventh embodiment of the present invention.
13 is a flowchart illustrating a method of selecting a channel for receiving position correction information according to an embodiment of the present invention.
14 is a flowchart illustrating a method of selecting a channel for receiving position correction information according to another 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 a digital multimedia broadcasting (DMB), a digital video broadcasting (DVB-H) 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. In addition, it will be appreciated that the broadcast network is a collection of network entities for providing various digital broadcasting or digital multimedia broadcasting described above.

In the embodiment of the present invention, the communication network means a broadband mobile communication network, and a mobile communication network such as 3G or 4G used at the time of filing of the present patent is representative, and a mobile communication network having a so-called LTE or LTE- . However, the present invention is not limited to such a communication network, and the communication network according to an embodiment of the present invention may be a legacy communication network provided with a platform such as CDMA2000 and IMT2000, There is also. Further, the communication network according to the embodiment of the present invention should be understood to include both a circuit switching based communication network and a packet switching based communication network.

The 'location information' according to the embodiment of the present invention is a value obtained from a GPS signal received from a GPS satellite and may be provided in coordinates such as latitude, longitude, and altitude. Also, the 'position correction information' according to the embodiment of the present invention is information providing a range of error of the GPS signal according to the DGPS (Differential GPS) technique as a value, thereby enabling correction of the position information. More specifically, information transmitted from GPS satellites to terrestrial GPS receivers has an error. When there are two receivers located close to each other, the two receivers have a similar error. The DGPS technique is to obtain more precise data by canceling the common errors of the two receivers. The position correction information according to an embodiment of the present invention includes information for canceling the error.

First, a position correction information providing system according to an embodiment of the present invention will be described. 1 is a view for explaining a position correction information providing system according to an embodiment of the present invention.

Referring to FIG. 1, a correction information providing system according to an embodiment of the present invention includes a GPS satellite 1, a plurality of reference stations 10, a first collecting server 100, a second collecting server 200, (300), a communication network (40), a broadcasting network (50), and a user device (600). Here, the communication network 40 includes a communication network server 400, a base station 3 and an access point (AP) 4, and the broadcasting network 50 includes a broadcasting network server 500 and a broadcasting transmitter 5 do.

The reference station 10 receives GPS position information transmitted from the GPS satellite 1 through a plurality of GPS antennas. Then, the reference station 10 generates the position correction information using the GPS information. Here, the position correction information typically includes a pseudo range correction (PRC). The reference station 10 calculates the difference between the geometric distance from each GPS satellite 1 and the pseudo distance recorded with the C / A code data, and this difference becomes the pseudorange correction value PRC. Further, the position correction information may further include a distance rate correction value (RRC). The RRC is the adjustment value of the pseudorange correction based on the PRC's predicted rate and varies 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 position correction information, and basically all factors and parameters according to the Radio Technical Committee for Maritime Service (RTCM) standard may be included. The reference station 10 may transmit the generated position correction information to the first acquisition server 100 and the second acquisition server 200 when the position correction information is generated.

The first collection server 100 is for collecting correction information from a plurality of reference stations 10. The first collecting server 100 collects the correction information of each of the plurality of reference stations 10 through a dedicated line connected to the plurality of reference stations 10. The first collection server 100 encodes the correction information according to the format of the first collection server 100 of each reference station 10 and provides the encoded correction information to the service server 300 through a dedicated line . Here, the dedicated line may be an Internet line. Also, the first collecting server 100 may be a Networked Transport of RTCM via Internet Protocol (Ntrip) server.

The second collecting server 200 is also for collecting correction information from a plurality of reference stations 10 as in the first collecting server 100. The second collecting server 200 collects correction information of each of the plurality of reference stations 10 through a dedicated line connected to the plurality of reference stations 10. The second collection server 200 encodes the correction information collected from the reference station 10 in the format of the second acquisition server 200 and provides the encoded correction information to the service server 300 through a dedicated line do. Here, the dedicated line may be an Internet line. Also, the second collection server 200 is preferably a Regional Area Augmentation System (RAAS) server.

The service server 300 may receive the position correction information from the first and second acquisition servers 100 and 200, and may merge and store the received position correction information. At this time, if there is an error in any one of the position correction information received from the first acquisition server 100 and the second acquisition server 200, an error can be corrected using another position correction information have. The service server 300 may provide the location correction information incorporated in the network server 400 and the broadcast network server 500.

The network server 400 is a network entity belonging to the communication network 40 for providing the location correction information to the user device 100 of the user subscribed to the service provided by the communication network 40. The communication network server 400 may transmit a communication signal including position correction information to the user apparatus 600 through the base station 3 or the AP 4. [

The broadcasting network server 500 is for providing the location correction information to the user device 600 of the user subscribed to the service provided by the broadcasting network 50 as a network entity belonging to the broadcasting network 50. The broadcasting network server 500 can transmit a broadcasting signal including position correction information to the user equipment 600 through the broadcasting transmitter 5.

The user device 600 is a device including a function of providing location information to a user. In order to provide more precise position information, the user device 600 receives the position correction information, corrects the position information using the received position correction information, and provides the corrected position information to the user. Such a user device 600 may advantageously illustrate a smart phone. However, the user device 600 may be various devices such as a navigation device, a mobile communication terminal, a PDA, a tablet PC, a smart phone, and a digital camera in addition to a smart phone. Therefore, various modules can be provided according to each device. Those skilled in the art will appreciate that the various devices described above may have a variety of output means and that the positional information corrected in accordance with the position correction information of the embodiment of the present invention described above may be stored in a suitable manner It can be used, or output.

In particular, the user device 600 may receive position correction information in a number of ways. The user apparatus 600 receives the position correction information transmitted from the communication network server 400 through the base station 3 or receives the position correction information transmitted from the communication network server 400 through the AP 4 Or the location correction information transmitted by the broadcasting network server 500 through the broadcast transmitter 5. Hereinafter, for convenience of explanation, a path through which the position correction information transmitted by the communication network server 400 is transmitted through the base station 3 is referred to as a first channel 21 or a broadband channel, and the communication network server 400 transmits A path through which one position correction information is transmitted through the AP 4 is referred to as a second channel 22 or a WiFi channel and a path through which the position correction information transmitted by the broadcasting network server 500 is transmitted through the broadcasting transmitter 5 The third channel 23 or the broadcast channel. The user device 600 may select any one of the plurality of channels described above to receive position correction information.

2 is a view for explaining a channel selection method of a user equipment according to a service coverage according to an embodiment of the present invention. 2, a base station, an AP, and broadcast transmitters 3, 4, and 5, which transmit position correction information through respective channels, have limited service coverage capable of providing wireless interval service according to the magnitude of transmission power to be. Also, the base station, the AP, and the broadcast transmitters 3, 4, 5 each have different service coverage. As shown, the service coverage (C1) of the base station, the service coverage (C2) of the AP and the coverage (C3) of the service broadcast dispatcher are different from each other. In the edge portion of the normal service coverage, the radio waves of the base station, the AP, and the radio section service devices such as the broadcast transmitters 3, 4 and 5 may not be properly transmitted. For this reason, if the user equipment 600 is at the edge of the coverage of the base station 3 and is in a position very close to the AP 4, the channel condition of the first channel is not good, but the channel condition of the second channel is good . Each base station, AP, and broadcast transmitters 3, 4, 5 may each have a shadow area. These shaded areas may be areas beyond the service coverage, or even within the service coverage, due to interference from radio waves or interference from features. Therefore, when the user equipment 600 is in a specific position, the channel state may be poor due to the shaded area for a certain channel, but may be an area where the channel state is very good for other channels. Also, when user equipment 600 is in a particular location, there may be cases where it does not belong to the service coverage of a particular channel. In consideration of the above-described situations, the user apparatus 600 according to an embodiment of the present invention receives position correction information by selecting any one of a plurality of channels according to a situation, corrects the position information through the position correction information, Information can be provided.

The configuration of the user apparatus 600 according to the embodiment of the present invention will now be described in more detail. 3 is a block diagram illustrating a configuration of a user apparatus according to an embodiment of the present invention.

3, a user apparatus 600 according to an embodiment of the present invention includes a location information receiving unit 610, a broadband communication unit 620, a local communication unit 630, a broadcast receiving unit 640, an input unit 650, A memory 660, a storage unit 670, and a control unit 680.

The position information receiving unit 610 is for receiving position information from the GPS satellite 1. For example, the position information receiving unit 610 can continuously receive the position information through the GPS signal received from the GPS satellite 1 or the like. In particular, the position information receiver 610 according to the embodiment of the present invention receives the position correction information from the controller 680, corrects the position information using the input position correction information, Lt; RTI ID = 0.0 > 680 < / RTI > Such location information may be coordinates such as latitude, longitude, and altitude. At this time, the position information receiving unit 610 may provide the position information corrected in the NMEA (National Marine Electronics Association) 0183 format to the control unit 680.

The broadband communication unit 620 is for connecting the user apparatus 600 to the network through the base station 3 and communicating with other apparatuses via the connected network. For this purpose, the broadband communication unit 620 may include an RF transmitter for up-converting and amplifying the frequency of a transmitted signal, an RF receiver for low-noise amplifying the received signal, and down-converting the frequency of the received signal. The broadband communication unit 620 receives the position correction information from the communication network server 400 through the base station 3. That is, the broadband communication unit 620 can receive the position correction information through the first channel 21. [ The position correction information received through the first channel 21 has a file structure of the first format. For example, the file structure of the first format may be a file structure of the Radio Technical Committee for Maritime Service (RTCM) format. The broadband communication unit 620 receives the position correction information through the first channel 21 and transmits the received position correction information to the controller 680. [

The short-range communication unit 630 is for connecting the user apparatus 600 to a network through an access point (AP) 4 and communicating with other apparatuses through a connected network. The short-range communication unit 630 may include an RF transmitter for up-converting and amplifying a frequency of a transmitted signal, an RF receiver for low-noise amplifying a received signal, and down-converting the frequency of the received signal, . The local communication unit 630 receives the location correction information from the communication network server 400 through the AP 4. [ That is, the short-range communication unit 630 receives the position correction information through the second channel 22. In addition, the position correction information received through the second channel 22 has a file structure of the first format. For example, the file structure of the first format may be a file structure of the RTCM format. When the local communication unit 630 receives the position correction information through the second channel 22, the local communication unit 630 transmits the received position correction information to the control unit 680.

The broadcast receiver 640 is for receiving a broadcast signal from the broadcast network server 500 through the broadcast transmitter 5. Such a broadcast signal may include position correction information. Accordingly, the broadcast receiver 640 can receive the position correction information from the broadcast network server 500 through the broadcast transmitter 5. A path through which the user apparatus 600 receives the position correction information from the broadcasting network server 500 through the broadcast radiator 5 is referred to as a third channel 23 in the embodiment of the present invention. In addition, the position correction information received via the third channel 23 has a file structure of the second format. For example, the file structure of the second format may be a file structure of the DGI format. Upon receipt of the position correction information through the third channel 23, the broadcast receiver 640 transmits the received position correction information to the controller 680. [

The input unit 650 receives a user's key operation for controlling the user device 600, generates an input signal, and transmits the generated input signal to the control unit 680. The input unit 650 may include any one of a power key, a numeric key, and a direction key for power on / off, and may be formed of a predetermined function key on one side of the user device 600. The input unit 650 may perform functions of the respective kinds of keys on the display unit 660 and may be omitted if the display unit 660 can perform all the functions.

The display unit 660 receives data for screen display from the control unit 680 and displays the received data on a screen. The display unit 660 visually provides menus, data, function setting information, and various other information of the user apparatus 600 to the user. The display unit 660 functions to output a boot screen, a standby screen, a menu screen, and other application screens of the user device 600. When the display unit 660 is formed of a touch screen, some or all of the functions of the input unit 650 may be performed instead. The display unit 660 may be formed of a liquid crystal display (LCD), an organic light emitting diode (OLED), an active matrix organic light emitting diode (AMOLED), or the like.

The storage unit 670 stores programs and data necessary for the operation of the user apparatus 600, and can be divided into a program area and a data area. The program area may store a program for controlling the overall operation of the user device 600, an operating system (OS) for booting the user device 600, an application (APP), and the like. In particular, an application (APP) according to a preferred embodiment of the present invention may be an app for a smartphone that provides an LBS. The data area is an area where user data generated according to use of the user device 600 is stored. In addition, the storage unit 670 may store various kinds of data generated according to the use of the user device 600 of the user. For example, the storage unit 670 may store location information, location correction information, and the like according to an embodiment of the present invention. Each kind of data stored in the storage unit 670 can be deleted, changed, or added according to a user's operation.

The controller 680 may control the overall operation of the user device 600 and the signal flow between the internal blocks of the user device 600 and may perform a data processing function for processing the data. The controller 680 may be a central processing unit (CPU), an application processor, or the like.

The control unit 680 includes a position information module 681 for performing all processes related to the position information and the position correction information according to the embodiment of the present invention. The location information module 681 provides location information to the application APP in response to a request from the application APP when the application APP is executed on the control unit 680. [

The position information module 681 may control the wideband communication unit 620, the short range communication unit 630, and the broadcast reception unit 640 to receive position correction information through any one of the first to third channels. At this time, the position information module 681 selects one of the first to third channels according to the preset condition, receives the position correction information through the corresponding channel, and outputs the position correction information to another channel May be selected to receive position correction information. The operation of the control unit 680 and the position information module 681 will be described in more detail below.

4 is a flowchart illustrating a method of providing location information according to an embodiment of the present invention. 5A and 5B are diagrams for explaining a method of changing the second type of position correction information to the first type of position correction information and providing the same.

In FIG. 4, it is assumed that the position information receiving unit 610 continuously receives position information from the GPS satellite through the GPS signal. It is also assumed that the application (APP) has been executed. As a preferable example, it is assumed that an executed application (APP) is an application for a smartphone for providing an LBS (Location Based Service). The application (APP) can request location information from the location information module 180 periodically or whenever a specific event occurs. Accordingly, the location information module 681 of the control unit 680 can receive the location information request from the application APP in step S110.

When the location information is requested, the location information module 681 may select one of the plurality of channels to receive the location correction information. To this end, the position information module 681 transmits a request message for requesting the position correction information through the selected channel among the plurality of channels in steps S120a, S120b and S120c. In step S130a, step S130b and step S130c, Information can be received. The position information module 681 selects one of the steps S120a and S130a, S120b and S130b, and S120c and S130c. For example, the location information module 681 may select the first channel 21 from which the location correction information is received from the communication network server 400 through the base station using the broadband communication unit 620, as in steps S120a and S120a. Alternatively, the position information module 681 may transmit the second channel 22 for receiving the position correction information from the communication network server 400 through the AP 4 using the short range communication unit 630, as in steps 120b and 120b You can also choose. The location information module 681 may further include a second channel 22 for receiving location correction information from the communication network server 400 through the AP 4 using the short distance communication unit 630 as in steps S120b and S120b You can also choose.

On the other hand, the position correction information can be received in the first format or the second format. The first type of position correction information is received via the first and second channels and the second type of position correction information is received via the third channel. If the second type position correction information is received, the position information module 681 reconstructs the second type of position correction information in the first format in step S140. Here, the first format may be the RTCM format and the second format may be the DGI format. 5A and 5B, the room for reconstructing the position correction information of the first format into the second format is the RTCM format and the second format is the DGI format.

The position correction information includes correction information and reference station information which is information on the reference station that generated the correction information. 4A shows a method of changing the correction information of the second format to the first format. As shown, the position information module 681 parses the correction information of the second format in step S141, and extracts a desired field value. Then, the location information module 681 generates a plurality of words by inserting a field value corresponding to the field of the first format, using the field value extracted in step S142. Next, the position information module 681 generates a parity corresponding to each word using the field value of each word in step S143. Then, the position information module 681 completes the first type of correction information by attaching parity to the word in step S144. In addition, a method of changing the reference station information of the second format to the first format is shown in Fig. 4B. Similar to the correction information in FIG. 4A, the position information module 681 parses the reference station information of the second format in step S146, extracts a desired field value, and after performing the process in step S147, 1 format to generate a plurality of words. Then, the position information module 681 generates parity corresponding to each word using the field value in step S148, and attaches parity to the word in step S149 to complete the first type reference station information.

4, after receiving the position correction information of the first format, or after receiving the position correction information of the second format and changing the position information to the first format, the position information module 681 determines And transmits the correction information to the position information receiving unit 610. Then, the position information receiving unit 610 corrects the position information received in step S160 as the position correction information. Then, the position information receiving unit 610 transmits the corrected position information to the position information module 681 in step S170. Then, the location information module 681 provides the location information corrected in step S180 to the application APP.

As described above, according to the embodiment of the present invention, position information can be corrected through position correction information to provide highly precise position information. Also, any one of the plurality of channels can be selected to receive the position correction information. The channel receiving the position correction information can be changed according to the state of the channel even when the position correction information is already received through the specific channel. Now, the method of selecting or changing the channel will be described.

First, a method of changing a channel for receiving position correction information in consideration of received signal strength will be described. 6 is a flowchart illustrating a method of changing a channel for receiving position correction information according to the first embodiment of the present invention.

Referring to FIG. 6, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S210. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640. At this time, the position information module 681 determines in step S220 whether the received signal strength of the signal for receiving the position correction information through the channel is less than a preset threshold value. At this time, if the received signal strength is equal to or greater than a preset threshold value, the position information module 681 returns to step S210 and receives position correction information through the corresponding channel. On the other hand, if the received signal strength is less than the preset threshold value, the position information module 681 changes the channel for receiving the position correction information in step S230.

As described above, when the received signal strength according to the first embodiment of the present invention is less than the threshold value, the position information module 681 determines that it has entered the shadow region for the channel, Change to another channel. Accordingly, the position correction information can be received without interruption, and highly precise position information can be provided without interruption.

Next, a method for changing the channel for receiving the position correction information in consideration of the position correction information reception period will be described. 7 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a second embodiment of the present invention.

Referring to FIG. 7, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S310. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640. At this time, the position information module 681 determines whether the reception period of the position correction information received through the corresponding channel is greater than a predetermined threshold value in step S320. At this time, if the reception period is shorter than the preset threshold value, the position information module 681 returns to step S310 and receives the position correction information through the corresponding channel. On the other hand, if the reception period is longer than the preset threshold value, the position information module 681 changes the channel for receiving the position correction information in step S330.

When the first embodiment changes the channel with the received signal strength as a factor, the second embodiment changes the channel with the reception period as a factor. The reference station periodically transmits the position correction information. If the channel state is stable, the position information module 681 can receive the position correction information every one second. However, if the period of receiving the position correction information becomes long, the previously received position correction information can not be used. In such a case, the precision of the position information is inevitably lowered. Therefore, according to the second embodiment, it is preferable that the preset threshold value of the reception period is set to a time that can provide a minimum quality of service. If the reception period is longer than this threshold value, , The channel is changed.

Next, a method for changing the channel for receiving the position correction information in consideration of the type of application (APP) and the position correction information reception period will be described. 8 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a third embodiment of the present invention.

Referring to FIG. 8, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S410. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640.

At this time, the position information module 681 determines whether the reception period of the position correction information received through the corresponding channel is longer than the position information request period of the currently executed application (APP) in step S420. At this time, if the reception period is shorter than the application information request period of the application APP, the location information module 681 returns to step S410 and receives the location correction information through the corresponding channel. On the other hand, if the reception period is longer than the application information request period of the application (APP), the position information module 681 changes the channel for receiving the position correction information in step S430.

If the second embodiment simply changes the channel with the reception period of the position correction information as a factor, the third embodiment further considers the period in which the application (APP) requests position information. Assuming that there is an application (APP) requesting location information once every 1.3 seconds, if the location information module 681 can receive the location correction information at a period of 1.2 seconds, the service There is no problem in maintaining the quality of the product. However, if the position information module 681 receives the position correction information at a period of 1.4 seconds, it is preferable to change the channel because the service quality required for the application (APP) can not be maintained.

Next, a method for changing the channel for receiving the position correction information in consideration of the position correction information reception period after considering the received signal strength will be described. 9 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a fourth embodiment of the present invention.

9, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S510. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640.

At this time, the position information module 681 determines whether the received signal strength of the signal for receiving position correction information through the channel is less than a preset threshold value in step S520. At this time, if the received signal strength is equal to or greater than a preset threshold, the location information module 681 proceeds to step S530. On the other hand, if the received signal strength is less than the predetermined threshold value, the position information module 681 changes the channel for receiving the position correction information in step S540.

In step S530, the position information module 681 determines whether the reception period of the position correction information received through the corresponding channel is longer than a preset threshold value. At this time, if the reception period is shorter than the preset threshold value, the position information module 681 returns to step S510 and continuously receives the position correction information through the corresponding channel. On the other hand, if the reception period is longer than the preset threshold value, the position information module 681 changes the channel for receiving the position correction information in step S540.

As described above, the fourth embodiment considers the reception period of the position correction information after considering the received signal strength. The fourth embodiment changes the channel immediately if the received signal strength is less than the threshold value. In addition, the fourth embodiment changes the channel even if the received signal strength is equal to or higher than the threshold, if the desired receiving quality can not be maintained because the receiving period becomes longer. In the case of a channel having a strong received signal strength, it provides a stable reception period but it is not necessarily observed. Particularly in the case of the base station 3 and the AP 4, since there is a throughput limit, If a plurality of clients (devices equivalent to or similar to the user apparatus 600) are camped or connected to the base station 3 or one AP 4, the reception period may be long even if the received signal strength is equal to or greater than the threshold value. Otherwise, the reception period may be long regardless of the received signal strength for various reasons. In this case, in the case of the fourth embodiment, the location information module 681 changes the channel.

Next, a method of changing the channel for receiving the position correction information in consideration of the received signal strength after considering the position correction information reception period will be described. 10 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a fifth embodiment of the present invention.

Referring to FIG. 10, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S610. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640.

At this time, the position information module 681 determines whether the reception period of the signal for receiving the position correction information through the corresponding channel is longer than a preset threshold value in step S620.

Here, if the reception period is shorter than the predetermined threshold value, the position information module 681 proceeds to step S630. On the other hand, if the reception period is longer than the preset threshold value, the position information module 681 changes the channel for receiving the position correction information in step S640.

In step S630, the position information module 681 determines whether the received signal strength of the position correction information received through the corresponding channel is less than a preset threshold value. At this time, if the received signal strength is equal to or greater than a preset threshold value, the position information module 681 returns to step S610 and continuously receives the position correction information through the corresponding channel. On the other hand, if the received signal strength is less than the preset threshold value, the position information module 681 changes the channel for receiving the position correction information in step S640.

The fifth embodiment described above is similar to the fourth embodiment, but the received signal strength is considered after considering the position correction information reception period first. That is, even if the reception period is shorter than the threshold, the fifth embodiment changes the channel in advance if the received signal strength is weak. This is because there is a possibility that the reception period will be shortened soon after the received signal strength is weak. In the case of the fifth embodiment, the channel can be changed in advance before the reception period becomes long, and the service quality can be stably provided. This fifth embodiment will have a greater advantage in case there is a time delay to channel change.

Next, a method of changing a channel for receiving position correction information in consideration of both the position correction information reception period and the received signal strength will be described. 11 is a flowchart for explaining a method of changing a channel for receiving position correction information according to the sixth embodiment of the present invention.

Referring to FIG. 11, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through a specific channel in step S710. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640. In step S720, the position information module 681 determines whether the received signal strength of the signal for receiving the position correction information through the channel is less than a predetermined threshold value and the reception period is longer than a predetermined threshold value.

At this time, if the received signal strength is equal to or greater than a preset threshold or the reception period is shorter than the predetermined threshold value, the position information module 681 returns to step S720 and receives the position correction information through the corresponding channel. On the other hand, if the received signal strength is less than the preset threshold value and the reception period is longer than the predetermined threshold value, the position information module 681 changes the channel for receiving the position correction information in step S730.

The sixth embodiment can be used in the case of providing a best effort service. In the case where it is necessary to perform other important processes first, or when there is a shortage of resources (threads, processes, buffers, etc.) to be allocated to the user device 600 and only limited resources are required, the channel is not changed unless it is the worst case.

Although it has been described above that the reception period is compared with the threshold value in S530, S620, and S720 of the fourth, fifth, and sixth embodiments described with reference to FIGS. 9 to 11, It can be judged by comparing with the request period. That is, instead of determining whether the position correction information reception period is longer than the predetermined threshold value as in the third embodiment of FIG. 8, whether the position correction information reception period is longer than the position information request period of the currently executed application (APP) And change the channel.

Next, a channel changing method for reserving a judgment with a different waiting time according to a currently connected channel will be described. 12 is a flowchart illustrating a method of changing a channel for receiving position correction information according to a seventh embodiment of the present invention.

Referring to FIG. 12, it is assumed that the position information module 681 of the controller 680 is receiving position correction information through the currently connected channel in step S810. That is, the position information module 681 is receiving position correction information through the wide-band communication unit 620, the short-range communication unit 630, and the broadcast receiving unit 640.

While receiving the position correction information, the position information module 681 determines whether or not the predetermined channel change condition is satisfied in step S820. Here, the channel change condition refers to a condition of using the received signal strength, the reception period, and the position information request period of the application (APP) as factors, as described with reference to Figs. 6 to 11 above. In any of the first to sixth embodiments It is possible. If the channel change condition is satisfied, the position information module 681 proceeds to step S830. If not, the process returns to step S810 and continues to receive the position correction information through the corresponding channel.

In step S830, the position information module 681 determines whether a state satisfying the predetermined channel change condition is continuously maintained during the hold time set according to the currently connected channel type. As a result of the determination in step S830, unlike in step S820, if the channel change condition is not satisfied, the process returns to step S810 and the position correction information is continuously received through the corresponding channel. On the other hand, if it is determined in step S830 that the channel satisfies the predetermined channel change condition continuously for the set retention time, the location information module 681 proceeds to step S840 and changes the channel for receiving the location correction information .

In the case of the seventh embodiment described above, the possibility that the channel state temporarily deteriorates and can be recovered again is taken into consideration. Therefore, even when the channel change condition is satisfied, the channel is changed only when the state satisfying the channel change condition is maintained during the hold time. If the channel is changed as soon as the channel change condition is satisfied, the channel change may occur frequently even in a situation where the channel state is temporarily poor. Herein, the retention time is set differently considering the service characteristics of the wireless section service apparatuses 3, 4 and 5 serving the corresponding channel and the service coverage thereof. That is, each of the first to third channels 21, 22, and 23 has different set retention times.

For example, it is assumed that a user carries a user apparatus 600 and moves. In the case of the first channel, a handover or a cell selection / reselection process may occur due to a service characteristic, and this process may cause the UE 600 to transmit data from one cell to another If the received signal strength is lowered below the threshold value before the movement to the cell is completed, the received signal strength will again rise above the threshold value. In the seventh embodiment, it is possible to save resources after waiting for a predetermined time instead of changing the channel for receiving the position correction information in such a situation. As described above, in the case of the first channel, even if the service coverage of one base station 3 is exceeded, the service coverage of the other base station 3 is entered. Therefore, if the currently connected channel is the first channel, , It is preferable to change the channel only when the channel change condition is still satisfied even when the period is exceeded. Accordingly, when the currently connected channel is the first channel, the holding time is preferably set to be longer than the time at which the handover is performed. As another example, when compared to the service area of the broadband mobile communication network using the base station 3 and the service area of the broadcasting network using the broadcast transmitter 5, the AP 4 in the case of the second channel has a very limited service area . For example, if the service coverage of a specific AP 4 is exceeded, it is unlikely that the service coverage of another AP 4 will enter again. Therefore, when the currently connected channel is the second channel, the holding time is preferably shorter than that in the case where the currently connected channel is the first channel or the third channel. As another example, the service area of the broadcasting network using the broadcast transmitter 5 in the case of the third channel is wider than the service area using the AP 4. On the other hand, the service area of the broadcasting network is more shaded than the service area of the broadband mobile communication network. Therefore, when the currently connected channel is the third channel, the retention time is preferably longer than the case where the currently connected channel is shorter than the first channel and the currently connected channel is the second channel. In summary, in the seventh embodiment described above, the holding time satisfies the following expression (1).

Figure pat00001

As described above, the present invention can change the channel for receiving the position correction information in consideration of at least one factor. Now, a method for selecting a channel to be changed after determining to change the channel will be described in more detail. That is, the steps S230, S330, S430, S540, S640, S730, and S850 described above will be described in detail.

According to the embodiment of the present invention, it is possible to assign a priority to a channel and to select a channel according to the priority. The broadcasting network, that is, the third channel, is free of charge, but the possibility of data reception delay is relatively higher than that of the communication network and the data reception delay is higher than that of the communication network. The first channel among the first and second channels using the communication network has relatively few shadow areas and the data reception rate is fast as compared with the third channel, but data fee may be incurred. There is a problem that the second channel can not be used when the data usage fee is free, but there is no AP capable of accessing the surroundings. When the data usage fee is taken into account, the second and third channels have a higher priority than the first channel, and when the service coverage is taken into consideration, the first channel, the third channel and the second channel may be given priority . Therefore, according to the embodiment of the present invention, when the data usage fee is taken into consideration, the priority is such that the second channel has the highest priority, the third channel has the higher priority, and the priority of the first channel is The lowest. Also, when considering the reliability of service coverage and data reception, the priority is that the first channel has the highest priority, the third channel has the higher priority, and the second channel has the lowest priority .

Hereinafter, a method of selecting a channel to be changed in consideration of a priority will be described according to an embodiment of the present invention. 13 is a flowchart illustrating a method of selecting a channel for receiving position correction information according to an embodiment of the present invention.

Referring to FIG. 13, in step S910, the position information module 681 of the controller 680 attempts to receive the position correction information through the channel having the highest priority among the channel candidates to receive the position correction information. In step S920, the position information module 681 determines whether the position correction information can be received. Here, the priority may be set in the order of the second channel, the third channel and the first channel in consideration of economical efficiency such as data usage fee, and the first channel, the third channel, and the third channel may be set in consideration of service coverage and reliability of data reception. And may be set in the order of the second channel. Also, in order to receive position correction information through a specific channel, it must be within the service coverage that services the channel. Accordingly, the location information module 681 can determine whether or not the location correction information can be received according to whether it is in the service coverage for service of the corresponding channel in step S920.

As a result of the determination in step S920, if it is not possible to receive the position correction information, the position information module 681 proceeds to step S940 and attempts to receive the position correction information through the next priority channel. On the other hand, if it is determined in step S920 that the position correction information can be received, the position information module 681 determines whether the channel state is good in step S930. Here, whether or not the channel state is good considers the received signal strength and the reception period. That is, whether the received signal strength is equal to or greater than a threshold value, whether the receiving period is shorter than the threshold value, whether the receiving period is shorter than the position information request period of the application (APP), and the like may be considered.

If it is determined in step S930 that the channel status is not good, the location information module 681 proceeds to step S940 and attempts to receive the location correction information through the next priority channel. If it is determined in step S930 that the channel status is good, the location information module 681 proceeds to step S950 and receives location correction information through the corresponding channel. In this way, according to the embodiment of the present invention with reference to FIG. 13, channels can be sequentially searched in accordance with a priority order to select a channel.

Next, a method for selecting a channel to be changed in consideration of a priority will be described according to another embodiment of the present invention. 14 is a flowchart illustrating a method of selecting a channel for receiving position correction information according to another embodiment of the present invention.

The position information module 681 receives position correction information through a plurality of connectable channels in step S1010. For example, the current user device 600 receives position correction information over all channels that it can connect to at a location.

Then, the location information module 681 selects a channel according to the priority and the channel state in step S1020. 13 and 13 are sequentially connected according to the priority order, and the channel status is checked. In this embodiment, the channel status is checked while all the connectable channels are connected at a time. Therefore, a channel having the best channel state can be selected. When the channel is selected, the location information module 681 receives the location correction information through the channel selected in step S1030 and releases the connection to the unselected channel.

14, the resource consumption of the user equipment 600 is larger than that of the embodiment with reference to FIG. 13, but since all the connections are performed at one time, the delay for channel selection is reduced, There is an advantage in that the channel having the < RTI ID = 0.0 >

Meanwhile, according to the embodiment of the present invention, when the channel is changed, the position correction information is continuously received through the pre-change channel and the position correction information is received through the changed channel, even after it is determined to change the channel. After confirming that there is no missing position correction information, it ends the connection with the channel before the change. The following Table 1 is intended to illustrate this method.

Reception time The position correction information generation time of the position correction information received via the third channel The position correction information generation time of the position correction information received via the first channel ... ... 23607 T1019 23608 T1020 23609 T1021 Start receiving 23610 T1022 T1024 23611 T1023 T1025 23612 T1024 T1026 23613 T1025 T1027 23614 T1026 T1028 23615 Reception end T1029 23616 T1030 ... ...

Table 1 assumes a situation in which the position correction information is received by changing the channel to the first channel while receiving the third channel. The position correction information includes a time when the reference station 10 generates the position correction information, and the position information module 681 can synchronize the third channel and the first channel using the time.

The position information module 681 decides to change the channel in which the position correction information is continuously received on the third channel and assumes that the channel is changed. Then, the position information module 681 will start receiving position correction information on the first channel. However, even when the position information module 681 starts receiving the position correction information through the first channel, it does not terminate the reception of the position correction information through the third channel. Instead, the position information module 681 terminates the connection with the third channel after receiving the position correction information having the same position correction information generation time at a predetermined number of times or more in both channels. As in the case of Table 1, the position information module 681 receives three pieces of position correction information, the time at which the position correction information is generated through the first and third channels is T1024, T1025 and T1026. In this case, Closes the connection with the channel. Thus, the channel can be changed stably without lost position correction information.

The positional information correction method using the positional correction information according to the 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.

1: GPS satellite 3: base station
4: Access point 5: Broadcast transmitter
10: reference station 40: communication network
50: broadcasting network 100: first collection server
200: second collecting server 300: service server
400: Network server 500: Broadcast network server
600: User device 610: Position information receiver
620: Broadband communication unit 630:
640: broadcast receiver 650: input
660: Display section 670:
680: control unit 690: position information module

Claims (8)

A position information receiving unit for receiving position information;
A broadband communication unit for receiving position correction information through a first channel using a base station of a communication network;
A local communication unit for receiving position correction information through a second channel using an access point of a communication network;
A broadcast receiving unit for receiving position correction information through a third channel using a broadcasting transmitter of a broadcasting network;
And the position information receiver receives the position correction information through the connected channel, and the position information receiver corrects the position information by using the received position correction information, And a position information module for transmitting the received position correction information to the position information receiving unit to correct the position information. The method according to claim 1,
The location information module
And when the strength of the received signal of the position correction information received through the selected channel is less than a predetermined threshold value, the position correction information selecting unit selects another channel and receives the position correction information. / RTI > The method according to claim 1,
The location information module
Wherein when the reception period of the position correction information received through the connected channel is longer than a predetermined threshold value, the position correction information selecting unit selects another channel and receives the position correction information. Device. The method according to claim 1,
The location information module
When the reception period of the position correction information received through the connected channel is longer than the period of requesting the position information of the currently executed application, selects another channel and receives the position correction information. Apparatus for providing location information. The method according to claim 1,
The location information module
Wherein when the state satisfying the channel change condition set for changing the connected channel is maintained for a preset holding time, another channel is selected and the position correction information is received. . 6. The method of claim 5,
The holding time is
Wherein the corrected position information is obtained by using the position correction information.
The holding time of the first channel> the holding time of the third channel> the hold time of the second channel 6. The method according to any one of claims 2 to 5,
The selection of the other channel is performed according to a predetermined priority,
Wherein the priority is set according to a data usage fee charged when a channel is used, or a priority is set according to a service coverage for a channel. In order to provide the location information corrected using the location correction information, . Receiving a request for location information from an executed application;
Receiving location correction information through a first channel using a base station of a communication network, a second channel using an access point of a communication network, and a third channel using a broadcasting transmitter of the broadcasting network;
Correcting the position information using the received position correction information; And
And providing the corrected location information to the application. ≪ Desc / Clms Page number 21 >
KR1020140113566A 2014-08-28 2014-08-28 Apparatus for providing location information corrected by using location correction information and method thereof KR20160025997A (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
KR101974002B1 (en) * 2018-11-14 2019-04-30 국방과학연구소 Method of positioning mobile device with seamless, high precision scheme

Citations (1)

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Publication number Priority date Publication date Assignee Title
KR20100077560A (en) 2008-12-29 2010-07-08 한국 천문 연구원 Differential gps information transmission system and receiving system utilizing t-dmb

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20100077560A (en) 2008-12-29 2010-07-08 한국 천문 연구원 Differential gps information transmission system and receiving system utilizing t-dmb

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101974002B1 (en) * 2018-11-14 2019-04-30 국방과학연구소 Method of positioning mobile device with seamless, high precision scheme

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