KR20150145039A - Apparatus for providing location correction information, Apparatus for providing location information using location correction information and method thereof - Google Patents

Abstract

The present invention relates to an apparatus and a method for providing location correction information and providing corrected location information by correcting location information by using the location correction information. The apparatus for providing location correction information may include: an interface receiving a first form of location correction information and a second form of location correction information; a control unit which generates location correction information created by merging the first and second forms of location correction information; a first broadcaster which transmits the merged location correction information in order to deliver the merged location correction information to a user device through a communication network; and a second broadcaster which transmits the merged location correction information to a boradcasting server in order for the merged location correction information to be delivered to the user device through the broadcasting network.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for providing positional correction information, an apparatus for providing positional information using positional correction information, and a method for providing the positional correction information,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position correction information providing technique, and more particularly, to a device and a method for providing position correction information 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 a method for correcting an error of position correction information using different types of position correction information and providing highly reliable position correction information.

It is another object of the present invention to provide an apparatus and method for providing position correction information through a communication network or a broadcasting network.

It is another object of the present invention to provide an apparatus and method for stably providing position correction information even in a shadow area of a communication network or a broadcasting network.

According to an aspect of the present invention, there is provided an apparatus for providing position correction information, including an interface unit for receiving position correction information of a first format and position correction information of a second format, A first caster for transmitting the merged position correction information to a communication network server so that the merged position correction information is transmitted to the user apparatus through a communication network; And a second caster transmitting the merged position correction information to the broadcasting network server so as to be transmitted to the user apparatus through the broadcasting network.

The controller corrects the error by using the other position correction information if it is determined that the position correction information is erroneous in any one of the first type of position correction information and the second type of position correction information.

On the other hand, the first type of position correction information and the second type of position correction information have at least PRC (Pseudo-Range Correction) and RRC (Range-Rate Correction) values. Accordingly, when at least one of the PRC and RRC values of the position correction information of the first type of position correction information and the second type of position correction information has an error, the control unit sets PRC and RRC And corrects the error by the value.

According to an aspect of the present invention, there is provided an apparatus for providing position information using position correction information, the apparatus comprising: a position information receiving unit for receiving a GPS signal from a GPS satellite; And a positional information correction unit that corrects the positional information using the positional correction information extracted from the broadcast signal, and when the received signal strength of the broadcast signal is less than a predetermined intensity, And a control unit for correcting the position information using the position correction information extracted from the communication signal.

The control unit corrects the positional information using the positional correction information extracted from the broadcast signal if the received signal strength of the communication signal is less than a preset intensity, .

According to another aspect of the present invention, there is provided a method for providing position correction information, the method comprising: receiving position correction information of a first format and position correction information of a second format; A step of merging the position correction information and the second type of position correction information to generate merged position correction information; a step of transmitting the merged position correction information to a communication network server so that the merged position correction information is transmitted to the user apparatus via the communication network; To the broadcasting network server so as to be transmitted to the user apparatus through the broadcasting network.

The generating includes correcting the error using one of the position correction information if the position correction information is determined to be in an error in any one of the first type of position correction information and the second type of position correction information do.

Here, the first type of position correction information and the second type of position correction information have at least PRC (Pseudo-Range Correction) and RRC (Range-Rate Correction) values. Accordingly, in the step of correcting the error, if there is an error in at least one of the PRC and RRC values of the position correction information of the first type of position correction information and the second type of position correction information, And corrects the error by using the PRC and the RRC values.

According to another aspect of the present invention, there is provided a method of providing position information using position correction information, the method comprising: receiving a GPS signal from a GPS satellite and extracting position information from the GPS signal; And correcting the positional information using the positional correction information extracted from the broadcast signal if the received signal strength of the broadcast signal is less than a predetermined intensity do.

The step of correcting the positional information using the positional correction information extracted from the broadcast signal may further include correcting the positional information using the positional correction information extracted from the broadcast signal if the received signal strength of the communication signal is less than a pre- .

According to the present invention as described above, when an error occurs in the position correction information of any one of the formats using different types of position correction information, the error can be corrected using the other position correction information, Can provide high position correction information. In addition, the position correction information can be provided through both the communication network and the broadcasting network, and the position correction information can be provided to various user apparatuses. Particularly, according to the present invention, it is possible to stably provide position correction information even in a shade area of a communication network or a broadcasting network.

1 is a view for explaining a position correction information providing system according to an embodiment of the present invention.
2 is a block diagram for explaining a schematic configuration of a service server 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 for providing position correction information and a method for providing position information using position correction information according to an embodiment of the present invention.
5 to 7 are diagrams showing a data structure for explaining the format of the RTCM message.
8 is a flowchart illustrating a method of providing location correction information of a service server according to an embodiment of the present invention.
9 is a flowchart illustrating a method of providing location information using location correction information of a user equipment 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 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 mobile communication network, and it is possible to exemplify a mobile communication network having a so-called LTE or LTE-A platform, which is representative of mobile communication networks such as 3G and 4G used at the time of filing of the present patent have. 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 and a base station 4, and the broadcasting network 50 includes a broadcasting network server 500 and a broadcasting transmitter 5.

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 an RRC. RRC (Range Rate Correction) is the adjustment value of the pseudorange correction value based on the prediction rate of the PRC and varies over time. The RRC is a calculated value that should be reflected in the PRC at a certain time, To increase the effectiveness of PRC. Various other factors and parameters may be included in the position correction information, and basically all factors and parameters according to the 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 of each reference station 10 in a first format and provides correction information of the first format to the service server 300 via 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 collecting server 200 encodes the correction information collected from the reference station 10 in a second format and provides correction information of the second format to the service server 300 through a dedicated line. 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 receives the position correction information of the first format and the second format, and merges and stores the position correction information of the first format and the second format. At this time, if there is an error in any one of the position correction information of the first format and the second type, the error can be corrected using the other position correction information. 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 the merged position correction information to the user equipment 100 through the base station 4. [

The broadcasting network server 400 is a network entity belonging to the broadcasting network 50 for providing the location correction information to the user device 100 of the user subscribed to the service provided by the broadcasting network 50. The broadcasting network server 500 may transmit the broadcast signal including the merged location correction information to the user equipment 100 through the broadcasting unit 5.

The user device 600 is a device including a function of providing location information to a user. Such a user device 600 may, for exemplary purposes, illustrate navigation. However, the user device 600 may be various devices such as a mobile communication terminal, a PDA, a tablet PC, a smart phone, and a digital camera in addition to navigation. 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.

Next, a schematic configuration of a service server for providing position correction information according to an embodiment of the present invention will be described. 2 is a block diagram for explaining a schematic configuration of a service server according to an embodiment of the present invention.

2, a service server 300 according to an embodiment of the present invention includes an interface module 310, a storage module 320, a control module 330, a first caster 340 and a second caster 350, . The interface module 310, the storage module 320, and the control module 330 may be connected to each other via a data bus and communicate with each other. Then, each of these configurations will be described.

The interface module 310 is for providing a communication interface with the first collection server 100 and the second collection server 200. That is, the interface module 310 communicates with the first collection server 100 and the second collection server 200. In accordance with this communication, the interface module 310 may receive the first type of position correction information from the first acquisition server 100 and may transmit the first type of position correction information to the control module 330. [ The interface module 310 may receive the position correction information of the second format from the second acquisition server 200 and may transmit the position correction information of the second format to the control module 330.

The storage module 320 stores various kinds of data used by the service server 300. Basically, the storage module 320 stores an operating system (OS) for the service server 300 to operate. When the service server 300 is activated, the storage module 320 stores the OS And loads it into the control module 330. In addition, the storage module 320 may store various kinds of applications required for the operation of the service server 300. Moreover, the storage module 320 may store the first format, the second format, and the merge position correction information according to the embodiment of the present invention. And can be stored in a file structure format or a database format of the storage method of the storage module 320. [

The control module 330 may control the overall operation of the service server 300 and the signal flow between the internal blocks of the service server 300 and may perform a data processing function for processing the data. The control module 330 may be a central processing unit (CPU), an application processor, or the like.

When the first type of position correction information and the second type of position correction information are received through the interface unit 310, the control module 330 generates an error in the first type of position correction information and the second type of position correction information After checking whether there is an error, correct the error. The position correction information of the first format and the position correction information of the second format differ only in format and include PRC, RRC, and the like, which are information for substantially correcting the position. That is, the first type of position correction information and the second type of position correction information have at least PRC and RRC values. Therefore, when there is an error in the PRC, RRC, or the like included in one of the position correction information of the first format and the position correction information of the second format, the control module 330 determines that the PRC, RRC, PRC, RRC, and so on.

If the error is corrected, the control module 330 merges and stores the first type of position correction information and the second type of position correction information. Then, the control module 330 transfers the merged position correction information to the first caster 340 and the second caster 350. Each of the first caster 340 and the second caster 350 converts the merged position correction information into a packet or signal of a format usable in the communication network 40 and the broadcasting network 50. Such conversion may be a process of packet-timing merged position correction information into packets of a format usable in the communication network 40 and the broadcasting network 50. [ Then, the first caster 340 transmits the packet-corrected position correction information to the communication network server 400 in the form of a packet usable in the communication network 40. Also, the second caster 350 transmits the packet-corrected position correction information to the broadcasting network server 500 in the form of a packet usable in the broadcasting network 50. Accordingly, the communication network server 400 and the broadcasting network server 500 can store the merged position correction information.

The user apparatus 600 receives the merged position correction information from at least one of the network server 400 and the broadcasting network server 500, and can correct the position information using the received position correction information. Hereinafter, a configuration of a user apparatus 300 for correcting position information using position correction information according to an embodiment of the present invention will be described. 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 exemplary embodiment of the present invention includes a communication unit 610, a broadcast receiving unit 620, a position information receiving unit 630, an input unit 640, a display unit 650, 660 and a control unit 670.

The communication unit 610 is for communicating with other devices via a base station or an AP. For this purpose, the communication unit 610 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal, and an RF receiver for low-noise amplifying the received signal and down-converting the frequency of the received signal. The communication unit 610 can receive a communication signal from the communication network server 400. [ This communication signal includes the merged position correction information received from the first caster 340 of the service server 300 by the communication network server 400. Upon receiving the communication signal including the merged position correction information, the communication unit 610 transmits the communication signal to the control unit 670.

The broadcast receiving unit 620 is for receiving a broadcast signal. The broadcasting signal includes position correction information received by the broadcasting network server 500 from the second caster 320 of the service server 300. Accordingly, the broadcast receiver 620 receives the broadcast signal including the position correction information and transmits the broadcast signal to the controller 670.

The position information receiving unit 630 is for receiving GPS signals. For example, the position information receiving unit 630 may continuously receive GPS signals from the GPS satellites 1 and the like, and may transmit the received GPS signals to the control unit 670. Then, the control unit 670 can extract position information from the GPS signal. Such location information may be coordinates such as latitude, longitude, and altitude.

The input unit 640 receives user's key operation for controlling the user device 600, generates an input signal, and transmits the input signal to the control unit 670. The input unit 640 may include any one of a power key, a numeric key, and a direction key for power on / off, and may be formed with a predetermined function key on one side of the user device 600. The input unit 640 may perform functions of the respective kinds of keys on the display unit 650. In the case where the display unit 650 can perform all functions only, the input unit 640 may be omitted.

The display unit 650 receives data for screen display from the control unit 670 and displays the received data on a screen. The display unit 650 visually provides menus, data, function setting information, and various other information of the user apparatus 600 to the user. The display unit 650 outputs a boot screen, a standby screen, a menu screen, and other application screens of the user device 600. When the display unit 650 is formed of a touch screen, some or all of the functions of the input unit 640 may be performed instead. The display unit 650 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 660 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 program, and the like. 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 660 may store various kinds of data generated according to the use of the user device 600 of the user. For example, the storage unit 660 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 660 can be deleted, changed, or added according to a user's operation.

The controller 670 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 to process the data. The controller 670 may be a central processing unit (CPU), an application processor, or the like.

The control unit 670 continuously receives the GPS signal from the GPS satellite 1 through the position information receiving unit 630 and derives the position information from the received GPS signal. Such location information includes latitude, longitude and altitude. The position information can be corrected through the position correction information according to the embodiment of the present invention. As described above, the network server 400 and the broadcast network server 500 store the same position correction information. Accordingly, the control unit 670 can receive the position correction information from at least one of the communication network server 400 and the broadcasting network server 500 and correct the position information.

For example, the control unit 670 receives the communication signal from the communication network server 400 through the communication unit 610, extracts the position correction information from the received communication signal, and corrects the position information using the extracted position correction information . Then, the corrected position information can be output through the display unit 650. In this way, the middle control unit 670, which corrects the position information by using the position correction information received from the communication network server 400, continuously transmits the received signal strength RSS (RSS) of the communication signal received through the communication unit 610 ). This may result in the received signal strength dropping below a predetermined threshold when the user equipment 600 is entering the shadow area of the network 40. If the received signal strength is less than a preset threshold value, the controller 670 receives the broadcast signal from the broadcast network server 500 through the broadcast receiver 620, extracts the position correction information from the received broadcast signal, The position information can be corrected using the position correction information.

On the other hand, in the above-described embodiment, it has been described that the position correction information extracted from the broadcast signal is used when the received signal strength of the communication signal is weak while using the position correction information extracted from the communication signal. In contrast to this process, when position correction information extracted from a broadcast signal is used and the received signal strength of the broadcast signal is less than a predetermined threshold value, the position correction information extracted from the communication signal may be used. As described above, according to the present invention, when the received signal strength of any one of the broadcast signal and the communication signal is weak, position correction information can be received from the other and corrected for position information. The reliability can be increased.

4 is a flowchart illustrating a method for providing position correction information and a method for providing position information using position correction information according to an embodiment of the present invention. 5 to 7 are diagrams showing a data structure for explaining the format of the RTCM message.

Referring to FIG. 4, the first collecting server 100 collects position correction information from at least one reference station 10 in step S110. Then, in step S120, the first collection server 100 transmits the collected position correction information to the service server 300. [ On the other hand, the second acquisition server 200 collects the position correction information from at least one reference station 10 in step S130. Then, in step S140, the second acquisition server 200 transmits the position correction information collected from the reference station 10 to the service server 300.

The position correction information transmitted by the first acquisition server 100 and the second acquisition server 200 is based on the RTCM message. That is, the position correction information is transmitted in the Radio Technical Committee for Maritime Service (RTCM) message. The RTCM message will be described below.

The header of the RTCM message is shown in FIG. As shown, the header of the RTCM message includes Preamble, Message Type (Frame ID), Station ID, Modified Z-Count, Sequence No., Number of data words, Station Health, and Parity fields. Here, the Preamble field is a field indicating the start of a frame, has a length of 8 bits, and has a fixed value of '0x66'. The Message Type (Frame ID) field indicates the format (type) of the message, has a length of 6 bits, and the value is 1 to 63. Here, 0 means 64. The message type can be of the type shown in Table 1 below.

Message format number Current Status Contents One fixing Differential GPS Corrections 2 fixing Delta Differential GPS Corrections 3 fixing GPS Reference Station Parameters ... ... ... 9 fixing GPS Partial Correction Set ... ... ... 60-63 reservation Multipurpose Usage

Table 1 describes message types 1, 3 and 9, which are mainly used messages, and each will be described in more detail below.

Station I.D. Field indicates an identifier of the reference station and has a length of 10 bits. The Modified Z-Count field indicates the reference time for this RTCM message, has a length of 13 bits, and is in units of 0.6 seconds (e.g., 10 = 10 * 0.6 = 6 seconds). Sequence No. Field indicates the sequence number of the frame, i.e., the sequence number, and is incremented by 1 for each frame. Its length is 3 bits. The Number of data words field indicates the number of data words contained in the frame and has a length of 5 bits. The Station Health field represents a unit of UDRE (User Differential Range Error) scale factor for describing the error range, and has a length of 3 bits. The Parity field is a parity for each word, and has a length of 6 bits.

If the message format is 1, the message is Differential GPS Correction and corresponds to the correction information. The contents of this message format 1 are shown in Fig. As shown, an RTCM message having a message format of 1 includes a Scale Factor (SF), a User Differential Range Error (UDRE), a Satellite ID, a Pseudo-Range Correction (PRC), a Range- Rate Correction (RRC) Data) and Filler fields.

The SF (Scale Factor) field indicates a unit for PRC or RRC, and has a length of 1 bit. Here, if the value of the SF (Scale Factor) field is 0, the PRC is 0.02 meters and the RRC is 0.002 meters / second. Also, if the value of the SF (Scale Factor) field is 1, the PRC is 0.32 meters and the RRC is 0.032 meters / second. The UDRE (User Differential Range Error) field indicates a range error and has a length of 2 bits. If the value of the UDRE field is 00, it indicates less than 1 meter, and if the value is 01, it indicates 1 to 4 meters, if the value is 10, it indicates 4 to 8 meters, and if it is 11, Lt; / RTI > The Satellite ID field indicates an identifier of the satellite, i.e., a satellite ID, and has a length of 5 bits. The Satellite ID field may have a value from 1 to 31 as its value. Here, 0 means 32. The PRC (Pseudo-Range Correction) field indicates the value of the pseudorange correction value and has a length of 16 bits. Here, if the value of the PRC (Pseudo-Range Correction) field is 0x8000, an error is considered to have occurred. The RRC (Range-Rate Correction) field indicates the compensation rate of the PRC, that is, the value of the distance variation rate correction value, and has a length of 8 bits. Here, if the value of the RRC (Range-Rate Correction) field is 0x8000, an error is considered to have occurred. The Issue Of Data (IOD) field has a key value for comparing with the IOD of the received GPS and has a length of 8 bits. The Filler field is used to fill the empty space of the last word and has a variable length according to the empty space of the last word, and this filler field is filled with '0'.

On the other hand, if the message format is 9, this message is similar to a message of message format 1, but does not provide position correction information for the entire satellite set. Therefore, when the message format is 9, the reliability of the position correction information is lowered, but the load of the network can be reduced because the amount of data is reduced.

If the message format is 3, the message provides GPS Reference Station Parameters. The contents of this message format 3 are shown in Fig. As shown, an RTCM message having a message format of 3 includes ECEF X, Y, and Z-Coordinate fields. The ECEF X, Y, and Z-Coordinate fields indicate the position of the reference station through the Earth-Centered-Earth-Fixed coordinate system, and each of the ECEF X, Y, and Z-Coordinate fields has a length of 32 bits. The unit is 0.01 m, and the range is 21474836.47 m.

When the first acquisition server 100 collects the position correction information and transmits the position correction information to the service server 300, the first acquisition server 100 transmits the position correction information of the first format. That is, the first collection server 100 transmits the RTCM message of the message format 1 or 9 as it is as the first type of position correction information. The first collection server 200 transmits the first type of position correction information through TCP / IP packet communication.

On the other hand, when the second acquisition server 200 collects the position correction information and transmits the position correction information to the service server 300, the second type of position correction information is transmitted. The second acquisition server 200 transmits the second type of position correction information through TCP / IP packet communication. Table 3 below is the source code of the structure for transmitting the position correction information to the second position correction information according to the embodiment of the present invention.

typedef struct
{
char stx1; // Fixed 0xAA
char stx2; // Fixed 0x22
char stx3; // Fixed 0x10
char reserved;
int msg_type;
short station_id;
short mz_count;
short data_cnt;
short data_seq;
} dgps_header; // Header

enum msg_type
{
MSG_TYPE_1_9 = 1,
MSG_TYPE_3
}; // Message format

struct send_data
{
dgps_header hdr;
msg_1_9 data;
}; // structure used for data transfer

struct msg_1_9
{
char factor;
char satellite_id;
short prc;
char rrc;
char iod;
short reserved;
}; // If the message type is 1 or 9,
struct msg_3
{
int version;
int x;
int y;
int z;
}; // If the message format is 3,

As shown in Table 3, in the header of a message transmitted from the second acquisition server 200 to the service server 300, a message type, a station id, a reference to an RTCM message, Time (mz_count), total number of satellites, sequence number, and the like. In particular, the second collecting server 200 may transmit a message of type 1 or 9 having the actual position correction information, and a message of three types having information of the reference station.

As described above, the service server 300 receives the position correction information of the first format in step S120, and the service server 300 may receive the position correction information of the second format in step S140. Then, in step S150, the service server 300 merges and stores the first type of position correction information and the second type of position correction information. At this time, if any one of the position correction information of the first format and the position correction information of the second format is found, the service server 300 replaces the position correction information with the value of the other position correction information without error, After correcting, the position correction information can be merged and stored.

The step S150 will be described in more detail as follows. That is, when the service server 300 receives the position correction information of the first format in step S120, the service server 300 stores the position correction information of the first format, as shown in the following Table 3, in step S150.

struct dgps_header
{
DateTime UTC
int station_id;
} // DGPS header
struct rtcm
{
char rtcm_msg;
} // RTCM message structure

As shown in Table 3, the first type of position correction information includes a DGPS header ('struct dgps_header') and an RTCM message structure ('struct rtcm'). The DGPS header includes a time ('UTC') at which the first type of position correction information was generated and a reference station identifier ('station_id'). The RTCM message structure includes an RTCM message ('rtcm_msg').

When the service server 300 receives the second type of position correction information in step S140, it stores the second type of position correction information in step S150 as shown in Table 4 below.

struct dgps_header
{
DateTime UTC
int msg_type;
short station_id;
short mz_count;
short data_cnt;
short data_seq;
}
struct msg_1_9
{
char factor;
char satellite_id;
short prc;
char rrc;
char iod;
short reserved;
}

struct msg_3
{
int version;
int x;
int y;
int z;
}

As shown in Table 4, the second type of position correction information includes a DGPS header ('struct dgps_header'), a message structure of message format 1 or 9 ('struct msg_1_9') and a message structure of struct message 3 ).

The position correction information of the first format and the second format is based on a value obtained from the same reference station 10, although the position correction information of the first format and the second format are different formats. For this reason, ≪ / RTI > For example, the position correction information of the first format and the second format includes at least a value for correcting the position information, at least a pseudo range correction (PRC) and a range rate correction (RRC).

Therefore, before the position correction information of the first format and the second format is merged, the service server 300 determines that there is an error in the PRC value if the value of the PRC field is 0x8000 in the position correction information of the first format and the second format , And if the value of the RRC field is 0x8000, the RRC value is regarded as having an error. Therefore, if it is determined that any one of the position correction information of the first format and the second format is erroneous, the service server 300 replaces the erroneous value with the value of the other position correction information, Lt; / RTI > For example, if it is determined that the value of the PRC field or the RRC value is erroneous, the erroneous value of one position correction information is replaced with the value of another position correction information to correct the error. After correcting the error in this way, the service server 300 merges and stores the position correction information of the first format and the second format.

Next, the service server 300 converts the position correction information that has undergone error correction, merging, and storage processes into packets of a format transmitted and received in the communication network 40, and then, in step S160, And transmits information. In step S170, the network server 400 may transmit the position correction information to the user equipment 600 subscribed to the service. At this time, the network server 400 may transmit the position correction information at the request of the user device 600. [

Correspondingly, the service server 300 converts the position correction information that has undergone error correction, merging, and storage processes into packets of the format transmitted and received in the broadcasting network 50, and then transmits the position correction information to the broadcasting network server 500 in step S180. Correction information can be transmitted. Then, the broadcasting network server 500 may transmit the position correction information to the user apparatus 600 subscribed to the service in step S190.

Hereinafter, a method of providing location correction information of a service server according to an embodiment of the present invention will be described in more detail. 8 is a flowchart illustrating a method of providing location correction information of a service server according to an embodiment of the present invention.

In step S210, the interface module 310 of the service server 300 receives the position correction information of the first format and the position correction information of the second format and transfers the same to the control module 320. [

The control module 320 corrects errors of the first type of position correction information and the second type of position correction information in step S220. At this time, if there is an error in the value of the position correction information of any of the first type and the second type position correction information, the control module 320 corrects the error by substituting the value of the other position correction information. For example, if the value of the PRC field is 0x8000 in the first and second types of position correction information, the control module 320 regards the PRC value as an error. If the value of the RRC field is 0x8000, the RRC value It is determined that there is an error. Accordingly, if it is determined that there is an error in the value of the PRC field or the value of the RRC in one of the position correction information of the first format and the second format, the control module 320 may convert the error value into another And corrects the error. On the other hand, if there is no error, step S220 is omitted.

Next, the control module 320 merges and stores the first type of position correction information and the second type of position correction information in step S230. According to an embodiment, the merged position correction information of the first format and the position correction information of the second format can be sequentially stored.

The control module 320 transfers the merged position correction information to the first caster 340 and the second caster 350 in step S240. Then, in step S240, the first caster 340 converts the merged position correction information into a packet or a signal usable in the communication network 40, and the second caster 350 converts the merged position correction information into a broadcast signal 50). ≪ / RTI > The conversion of the position correction information incorporating the first caster 340 into a packet or signal of a format usable in the communication network 40 can be performed by the type of the communication network 40 (for example, a circuit switching network or a packet switching network) And may vary depending on the protocol used for communication in the communication network 40. [ The conversion of the position correction information merged by the second caster 350 into a packet of a format usable in the broadcasting network 50 is also performed in accordance with the requirements for the communication of the broadcasting network 50 and the protocol used in the broadcasting network 50 It can be different.

In step S260, the first caster 340 transmits the position correction information converted into a packet in a format usable in the communication network 40 to the communication network server 400. The second caster 350 transmits the position correction information to the broadcasting network 50, To the broadcasting network server 500, the location correction information converted into the packet of the usable format. Accordingly, the communication network server 400 and the broadcasting network server 500 can store the position correction information in which the first type position correction information and the second type of position correction information are merged.

As described above, the position correction information in which the first type position correction information and the second type of position correction information are combined is transmitted to the communication network server 400 and the broadcasting network server 500. The user device 600 can correct the position information using the merged position correction information. A method of providing position information using position correction information of a user equipment according to an embodiment of the present invention will now be described. 9 is a flowchart illustrating a method of providing location information using location correction information of a user equipment according to an embodiment of the present invention. In FIG. 9, the position correction information received by the user apparatus 600 from the communication network server 400 or the broadcasting network server 500 is position correction information in which the position correction information of the first format and the second format is merged. 9, it is assumed that the user apparatus 600 is executing an application that provides a service for providing location information to a user. During execution of such an application, the user device 600 performs a process including the following steps.

9, the controller 670 continuously receives the GPS signal from the GPS satellite 1 through the position information receiver 630 in step S310, and derives the position information from the received GPS signal. Such location information includes latitude, longitude and altitude. Such position information should be corrected through position correction information. In step S320, the controller 670 receives the broadcast signal from the broadcast network server 500 through the broadcast receiver 620 and extracts the position correction information from the received broadcast signal. Then, the controller 670 corrects the positional information using the extracted positional correction information in step S330, and outputs the corrected positional information through the display unit 650. FIG. Thereby, the user can identify the current position.

On the other hand, as described above, after the positional information is corrected using the positional correction information extracted from the broadcast signal, the received signal of the broadcast signal while providing the corrected positional information may be reduced. This may illustrate, for example, the case where the user equipment 600 enters the shadow area of the broadcast network 40. [ If the broadcast signal is not received in the shaded area or an error occurs even if it is received, the necessary position correction information may not be extracted in time. Therefore, the control unit 670 can use the position correction information that can be extracted from the communication signal received from the communication network server 400, instead of the broadcasting signal received from the broadcasting network server 500. [ For this, the control unit 670 continuously checks the strength of the received signal for the broadcast signal of the broadcast receiver 620, and determines whether the received signal strength of the broadcast signal is less than a preset threshold value in step S340. As a result of the determination, if the received signal strength of the broadcast signal is equal to or greater than a predetermined threshold value, the controller 670 proceeds to step S320 and repeats the procedure described above. On the other hand, if the received signal strength of the broadcast signal is less than a predetermined threshold value, the controller 670 proceeds to step S350.

The control unit 670 receives the communication signal from the communication network server 400 through the communication unit 610 in step S350 and extracts the position correction information from the received communication signal. In step S360, the controller 670 corrects the position information using the position correction information extracted from the communication signal, and outputs the corrected position information through the display unit 650. [

On the other hand, in the above-described embodiment, it has been described that the position correction information extracted from the broadcast signal is used and the position correction information extracted from the communication signal is used when the received signal strength of the broadcast signal is weak. In contrast to this process, when the received signal strength of the communication signal is lower than a preset threshold while using the position correction information extracted from the communication signal, the position correction information extracted from the broadcast signal may be used.

If the received signal strength of the broadcast signal is less than a predetermined first threshold value and is equal to or greater than the second threshold value, the control unit 670 controls the communication unit 610 to communicate with the communication network server 400 through the communication unit 610, And starts the process of extracting the position correction information from the received communication signal and storing it in the storage unit 660 continuously. That is, when the received signal strength of the broadcast signal is less than the predetermined first threshold value and equal to or greater than the second threshold value, the controller 670 corrects the position information using the position correction information extracted from the broadcast signal, And stores the position correction information in the storage unit 660 continuously. If the received signal strength of the broadcast signal is less than the predetermined second threshold value or the position correction information can not be extracted from the broadcast signal or an error occurs in the position correction information extracted from the broadcast signal, If there is not, the position information is corrected by using the position correction information extracted from the communication signal which has been stored continuously. In this embodiment, the first threshold is the received signal strength that can be received at the edge portion of the shadow area, and the second threshold may be the received signal strength that can be received after entering the fully shadowed area. In the case of the first threshold value or less and the second threshold value or more, since the preliminary step is used for using the position correction information of the communication signal instead of the position correction information of the broadcast signal, the position correction information is seamlessly used, The position information can be corrected.

As described above, according to the present invention, when the received signal strength of the broadcast signal is weak, the position correction information can be received from the communication signal and the position information can be corrected, thereby increasing the reliability of the position information provided to the user .

The location correction information providing method and the location information providing method using the location correction information according to the embodiment of the present invention can 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 4: base station
5: Broadcast transmitter 10: Reference station
40: communication network 50:
100: first collection server 200: second collection server
300: service server 310: interface module
320: storage module 330: control module
340: first caster 350: second caster
400: Network server 500: Broadcast network server
600: User device 610:
620: Broadcast receiver 630: Position information receiver
640: input unit 650:
660: Storage unit 670: Control unit

Claims (10)

An apparatus for providing position correction information,
An interface unit for receiving position correction information of a first format and position correction information of a second format;
A control unit for merging the first type of position correction information and the second type of position correction information to generate merged position correction information;
A first caster for transmitting the merged position correction information to a communication network server so that the merged position correction information is transmitted to a user device through a communication network; And
And a second caster for transmitting the merged position correction information to a broadcasting network server so that the merged position correction information is transmitted to the user apparatus through a broadcasting network. The method according to claim 1,
The control unit
And corrects the error by using another position correction information if it is determined that any one of the first type of position correction information and the second type of position correction information has an error in the position correction information Apparatus for providing position correction information. 3. The method of claim 2,
Wherein the first type of position correction information and the second type of position correction information have at least PRC (Pseudo-Range Correction) and RRC (Range-Rate Correction)
Wherein the controller corrects the PRC and RRC values of the other position correction information if there is an error in at least one of the PRC and RRC values of the position correction information of either the first type position correction information or the second type position correction information, And corrects the error by the value of the position information. A position information receiver for receiving GPS signals from GPS satellites;
A communication unit for receiving a communication signal;
A broadcast receiver for receiving a broadcast signal;
Extracts position information from the GPS signal, corrects the position information using the position correction information extracted from the broadcast signal, and if the received signal strength of the broadcast signal is less than a predetermined intensity, And a controller for correcting the position information using the correction information based on the correction information. 5. The method of claim 4,
The control unit
And correcting the positional information using the positional correction information extracted from the communication signal if the received signal strength of the communication signal is less than a predetermined intensity, Wherein the position information is provided by using the position correction information. A method for providing position correction information,
Receiving position correction information of a first format and position correction information of a second format;
Merging the first type of position correction information and the second type of position correction information to generate merged position correction information; And
And transmitting the merged position correction information to a communication network server so that the merged position correction information is transmitted to the user apparatus through a communication network and transmitting the merged position correction information to the user equipment through the broadcasting network. A method for providing position correction information. The method according to claim 6,
The generating step
Correcting the error using the other position correction information if it is determined that any one of the first type of position correction information and the second type of position correction information has an error in the position correction information Wherein the position correction information is provided to the position correcting unit. 8. The method of claim 7,
Wherein the first type of position correction information and the second type of position correction information have at least PRC (Pseudo-Range Correction) and RRC (Range-Rate Correction)
Wherein the step of correcting the error includes correcting at least one of the PRC and RRC values of any one of the position correction information of the first format and the position correction information of the second format, And correcting the error by the PRC and RRC values of the position correction information. Receiving a GPS signal from a GPS satellite and extracting location information from the GPS signal; And
And correcting the positional information using the positional correction information extracted from the broadcast signal if the received signal strength of the broadcast signal is less than a predetermined intensity, Wherein the location information comprises at least one of location information, location information, and location information. 10. The method of claim 9,
And correcting the positional information using the positional correction information extracted from the communication signal if the received signal strength of the communication signal is less than a predetermined intensity, The method comprising the steps of: (a) receiving position correction information from at least one of the plurality of mobile stations;

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