KR20140045087A - Location compensation method for dgps technology and system thereof and apparatus, and device supporting the same - Google Patents

Abstract

The present invention relates to location compensation. Specifically, the present invention includes: a plurality of DGPS base stations that provide DGPS compensation information including the location of a user; and a terminal that selects a DGPS base station approached closest to a current location among the DGPS base stations based on the information about the location of the base stations and performs the location compensation based on the DGPS compensation information transmitted from the selected DGPS base station. Disclosed are a DGPS location compensation system and method, and an apparatus and a terminal supporting the same. [Reference numerals] (AA) KDGPS_DMB designation; (BB) KDGPS_DMB data length; (CC) KDGPS_DMB data; (DD) KDGPS_DMB data = 24 bit head + Nx40 bit data code; (EE) 24 bit; (FF) Data head; (GG) 40 bit; (HH) Data 1; (II) Data 2; (JJ) Data 3; (KK) 1 bit; (LL) 8 bit

Description

Location Compensation Method For DGPS Technology And System etc and Apparatus, and Device supporting the same}

The present invention relates to a DGPS position correction, and more particularly, to a method and system for correcting a position of a DGPS that supports more precise position correction using reference station information received from a plurality of reference stations, and an apparatus and a terminal supporting the position correction. It is about.

The Global Positioning System (GPS) system detects the location of a specific terminal using information provided by multiple satellites. Such a GPS system is widely used in various positioning systems. However, the GPS system has a large error because signals provided from the satellite to the GPS receiver are not accurately transmitted to the GPS receiver due to various environmental influences. For example, the position coordinates acquired by the conventional GPS receiver may cause errors up to 100 m due to various misalignments such as SA (Selectable availability).

Among various correction methods for overcoming such an error, there is a differential GPS (DGPS) method. In the DGPS method, the DGPS receiver receives the DGPS correction information from the DGPS reference station through a wireless communication network and supports error correction by correcting the error of the information received by the GPS receiver based on the received information.

However, the conventional DGPS method has a problem that the error rate is different depending on the distance between the reference station for transmitting the DGPS correction information and the GPS receiver. Accordingly, the error of the GPS receiver may occur seriously in the worst case depending on the position of the GPS receiver.

Korea Patent Registration 10-0977607, published on August 17, 2010 (name: high-precision location information transmission system and reception system using terrestrial DMB)

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, by using the DGPS correction information from the reference station located relatively close to the current terminal among the reference station providing a plurality of DGPS correction information. The present invention provides a method and a system for correcting a position of a DGPS, which can minimize the error, and a device and a terminal supporting the same.

In order to achieve the above object, the present invention provides a plurality of DGPS reference stations that provide DGPS correction information including their own location information, and the DGPS nearest to the current position among the plurality of DGPS reference stations based on the location information of the reference stations. A configuration of a position correction system of a DGPS, comprising a terminal for selecting a reference station and performing position correction based on the DGPS correction information transmitted from the corresponding DGPS reference station.

The present invention also provides a GPS receiver positioning apparatus for receiving position information from a satellite, a data receiver receiving data from a DGPS monitoring station, and position information received by the GPS receiver positioning apparatus and data received by the data receiver. A DGPS reference station comprising: a DGPS correction decoder to be generated, and a data transmitter to transmit the DGPS correction information to the data transmitting station so that the DGPS correction information can be transmitted in the DMB format, and writing the position information of the reference station to the DGPS correction information. Initiate.

The DGPS correction information is written and transmitted in the FIC region of the DMB transmission frame structure and includes latitude, longitude information, and height information of the reference station.

The data transmitting station transmits the DGPS correction information of the RTCM SC-104 format to the DMB packet format.

The present invention also provides a GPS receiver for receiving position information transmitted from a satellite, a DMB receiver for receiving DGPS correction information including position information of reference stations from a plurality of DGPS reference stations, and the positions of reference stations included in the DGPS correction information. And a terminal control unit which checks the reference station nearest to the current location based on the information and corrects the position information received by the GPS receiver based on the DGPS correction information provided by the reference station. The configuration of the terminal is described.

The DGPS correction information is written and received in the FIC region of the DMB transmission frame structure and includes latitude, longitude information, and height information of the reference stations.

The terminal control unit may include a DGPS decoder for converting the DGPS correction information transmitted in the DMB packet format into the RTCM SC-104 format.

The present invention also provides a method, comprising: transmitting, by a plurality of reference stations, DGPS correction information including their location information to one terminal, the terminal providing DPGS provided by the reference station nearest to the current location based on the location information of the reference station; Disclosed is a configuration of a position correction method comprising the step of correcting the position information received by the GPS receiver based on the information.

The method includes the step of the reference station converts the DGPS correction information of the RTCM SC-104 type into the DMB format and transmits the data to the transmitting data transmitting station, and the terminal transmits the DGPS correction information transmitted in the DMB packet format to the RTCM SC-104. The method may further include converting to a format.

The present invention also discloses the structure of a computer-readable recording medium on which a program for executing the above-described method is recorded.

As described above, according to the method and system for DGPS position correction according to the present invention and a terminal supporting the same, the present invention provides a more accurate method by performing position correction based on DGPS correction information transmitted from a reference station located relatively close to the terminal. Location information may be made available. That is, more accurate position correction may be performed using reference station information received from a plurality of reference stations.

In addition, the error rate can be minimized by utilizing the DGPS correction information from the reference station located relatively close to the current terminal among the reference stations providing a plurality of DGPS correction information.

In addition, since the correction information for DGPS can be transmitted by using a fast information channel (FIC) channel, which can receive a high reception rate and fast decoding, and can be transmitted through an MSC channel according to the policy, reliable position correction can be achieved. It is possible.

1 is a view schematically showing the configuration of a DGPS position correction system according to an embodiment of the present invention.
2 is a diagram schematically illustrating a structure of a DMB transmission frame carrying DGPS correction information according to the present invention.
3 is a diagram illustrating a DMB packet format of DGPS correction information according to an embodiment of the present invention.
4 is a diagram showing in more detail the configuration of a reference station for performing DGPS correction information transmission of the present invention.
5 is a diagram illustrating a configuration of a terminal for performing DGPS position correction according to an embodiment of the present invention.
6 is a diagram illustrating in more detail the configuration of the terminal control unit of the terminal configuration of FIG.
7 is a view for explaining the DGPS position correction method of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the embodiments of the present invention, descriptions of techniques which are well known in the technical field of the present invention and are not directly related to the present invention will be omitted. In addition, detailed description of components having substantially the same configuration and function 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. Accordingly, the present invention is not limited by the relative size or spacing depicted in the accompanying drawings.

1 is a view schematically showing the configuration of a position correction system of the DGPS according to an embodiment of the present invention.

Referring to FIG. 1, the position correction system 10 of the present invention may include a plurality of DGPS reference stations 210, 220, and 230 and a terminal 100.

In the position correction system 10 of the present invention having such a configuration, a plurality of DGPS reference stations 210, 220, and 230 provide DGPS correction information to the terminal 100, and the terminal 100 provides a plurality of DGPS references. The location information of the stations 210, 220, and 230 and their location information may be checked to adopt DGPS correction information provided by a reference station located relatively close to each other. Accordingly, the position correction system 10 of the present invention supports the DGPS correction information provided by the DGPS reference station located relatively close to the terminal 100 to be used for the position correction of the GPS receiver, thereby more accurately measuring the position of the terminal 100. I can support this to be possible. For example, the terminal 100 may correct the position information received by the GPS receiver using the DGPS correction information provided by the first DGPS reference station 210.

The plurality of DGPS reference stations 210, 220, and 230 generate DGPS correction information based on data received from the GPS receiver and the DGPS monitoring station, and transmit the generated DGPS correction information to the terminal 100. In particular, the DGPS reference stations 210, 220, 230 may transmit the DGPS correction information to the terminal 100 by including the DGPS correction information in the DMB format using the DMB transmission system. In this case, the DGPS reference stations 210, 220, and 230 of the present invention may transmit their own unique location information to the terminal 100 in DMB format by including the DGPS correction information.

Here, the DGPS correction information may be provided to the terminal 100 in a DMB transmission frame structure as shown in FIG. 2. In the DMB transmission frame structure, a data transmission channel using DMB is largely divided into a fast information channel (FIC) and a main service channel (MSC). Is sent. The FIC is a channel through which the receiver transmits information necessary for decoding in order to use a service desired by a user, such as various service information and content composition information carried on the MSC. The FIC also uses a fast information data channel (FIDC). It is possible to transmit limited data. In addition, data transmission protocols applicable to data transmission using the MSC include a transmission data channel (TDC), a multimedia object transfer (MOT), and an IP data diagram tunneling (IP data diagram tunneling). ).

TDC is a data transfer protocol of DMB for data transmission in a stream manner, and is used for transmission of TPEG (Transport Protocol Experts Group) data of KBS. In addition, MOT is a method of transmitting data in units of objects, and is used to transmit TPEG data of other DMB broadcasters such as MBC and YTNDMB except KBS. FIC offers more robust error correction and no time interleaving than MSC, so it has the advantage of higher reception and faster decoding than MSC, but it is not suitable for transmitting large data such as video and audio. However, data service using FIC is suitable for critical information service that requires urgent information. Data transmission using MSC channel consists of CIFs. One CIF is 55,296 bits, which corresponds to 864 Capacity Unit (CU) and is transmitted every 24ms. do. Accordingly, the present invention can transmit correction information for DGPS using a fast information channel (FIC) channel capable of high reception rate and fast decoding in a DMB broadcasting system, and may be transmitted through an MSC channel depending on a policy.

The terminal 100 receives the DGPS correction information transmitted through the DMB transmission channel, and supports the GPS receiver to correct the received information by using the received DGPS correction information. In particular, the terminal 100 receives DGPS correction information in a DMB format from a plurality of DGPS reference stations 210, 220, and 230, and checks the received signal to include the DGPS reference stations 210, 220 included in the DGPS correction information. , Location information of 230 may be confirmed. The DGPS reference station is detected by comparing the current location of the terminal 100 with the location information of each of the DGPS reference stations 210, 220, and 230. The terminal 100 may correct the position information received by the GPS receiver based on the detected DGPS correction information provided by the detected DGPS reference station. Accordingly, the terminal 100 of the present invention can support accurate position measurement by performing more precise position correction. Detailed configuration and operation of the terminal 100 will be described in more detail with reference to the accompanying drawings.

As described above, when the terminal 100 receives the DGPS correction information from the plurality of DGPS reference stations 210, 220, and 230 as a DMB signal, the position correction system 10 of the present invention provides a current information of the terminal 100. It supports to perform location information correction using DGPS correction information provided by a DGPS reference station located relatively close to the location. Accordingly, the position correction system 10 of the present invention can support more precise position correction and measurement.

FIG. 3 is a diagram illustrating a DMB transmission frame structure in which location information of DGPS reference stations 210, 220, and 230 is written according to an embodiment of the present invention.

Referring to FIG. 3, referring to the structure of the KDGPS_DMB data packet of the position correction system 10 using the DMB transmission frame structure according to the present invention, user application information can be defined in DMB to support various application services. In this case, an extension 13 (FIG 0/13) of FIG (Fast Information Group) type 0 is applied. In addition, the user application data packet configuration includes an 11-bit user application type definition (b15-b5), a location byte definition of the DGPS reference station (L10-L0) of 11 bytes, and a 5-bit user application data length (b4-). b0) and a data field that is an integer multiple of 8 bits within the size of 32 bytes. The b15-b5 may be applied to the code (00000000101) allocated for the DGPS of the ETSI 300 401 as it is, and the b4-b0 indicates the length of the KDGPS_DMB data field in bytes. In particular, the location information of the DGPS reference station of the present invention is defined as a field name of KDGPS_DMB_LOCATION, and the size is defined as a size including latitude, longitude, and height values of the GPS standard format. The latitude and longitude values may be expressed in degrees, minutes, and seconds, and the height value may be expressed in km as a height value of a GPS satellite. Latitude and longitude may be allocated by a constant byte, for example, 5 bytes, and a height value may be allocated by 1 byte. On the other hand, a larger number of bytes may be allocated for writing the detailed information related to the position information of the reference station described above, or a smaller number of bytes may be allocated for writing the general information.

On the other hand, the data field of KDGPS_DMB is composed of a data head occupying 24 bits followed by 40 bits of data codes. In addition, the data head is located at the head of the data field in the KDGPS_DMB format, and 6 of the 2 words (total 60 bits: 30 bits / word) that appear at the beginning of all message formats defined in the RTCM SC-104 are required for KDGPS_DMB. A total of 24 bits can be encoded in a message type of 13 bits, a modified Z-count of 13 bits of message information, and a length of frame of 5 bits. That is, as shown in Table 1 below, the DGPS packet is selected by selecting only the information required when the DMB receiver restores the RTCM SC-104 code from the information type and size indicated by the two words corresponding to the head of the RTCM SC-104. Defined in the header of the.

Header information of RTCM SC-104 and KDGPS_DMB [unit: bit] division RTCM SC-104 KDGPS_DMB Preamble 8 X Message type 6 6 Station ID 10 X Station z-count 13 13 Sequence No. 3 X Length of Frame 5 5 Station health 3 X Parity 12 X sum 60 24

As shown in Table 1, the header information of KDGPS_DMB in the present invention is 8 bits of Preamble, 10 bits of Station ID, 3 bits of Sequence No., 3 bits in the header information of RTCM SC-104 which is a total of 60 bits. Station health and 12 bits of parity are omitted to make the total 24 bits. Meanwhile, Message type (DGPS message type) and contents defined in RTCM SC-104 are shown in Table 2 below.

RTCM Message Types and Contents Message type number condition Contents One Fixed Differential GPS corrections 2 Fixed Delta differential GPS corrections 22-58 - Undefined 59 Propriety message 60-63 Reserved Multipurpose usage

As shown in <Table 2>, message types and contents defined in RTCM SC-104 are defined from 1 to 63. Each message is fixed, tentative, reserved, undetermined. It is set to an undefined, retired or the like state. In the present invention, KDGPS_DMB may transmit message information # 1 (Fixed_differential GPS corrections) and # 2 (Fixed_delta differential GPS corrections). The KDGPS data code, which occupies 40 bits of the KDGPS_DMB data packet block, is set to abbreviately transmit messages 1 and 2, which are key error correction information, among the DGPS information provided by the RTCM SC-104. At this time, data is loaded by the number of satellites provided with error correction information, and other data is replaced by a FILL code filled with bits of 1 and 0 repeated, and each 40-bit data code is configured as shown.

In addition, the data codes include six items, such as Scale factor and Satellite ID, for transmitting KDGPS_DMB information provided by RTCM SC-104 Message type 1 as shown in Table 3, and the precision is 16-bit similar distance correction value ( In PRC: Pseudorange correction, it is set to 0.02 meters, and in 8-bit range correction (RRC), it is set to 0.002 meters per unit time (sec).

Information of RTCM SC-104 Message type1 division RTCM SC-104 Precision Remarks Scale factor One UDRE 2 Satellite ID 5 PRC 16 RRC 8 0.02 m IOD 8 0.002 m / s sum 40

In addition, when converting the format of the KDGPS_DMB method according to the present invention into the RTCM SC-104 compatible code in the DMB receiver, Preamble which is information omitted from two headers (60 bits in total) appearing in the header of all messages of the RTCM SC-104. (8 bits), Station ID (10 bits), Sequence No. (3 bits), Station health (3 bits), and Parity (12 bits) are replaced by 0, and the first 8 bits, Preamble, are defined in RTCM SC-104. Replaced with a value of 66 hexa. In addition, the DGPS correction information type received at the DMB receiver and added with elimination information is encoded by a Hamming code defined in ICD-GPS-200 and restored to the information of the original RTCM SC-104 format. Therefore, in the present invention, the DGPS correction information is formatted and transmitted to suit the DMB scheme, but is transmitted to the terminal 100 including the location information of each DGPS reference station, which is received by the terminal and relatively close to its own location. The DGPS correction information transmitted by the reference base station located is converted into RTCM SC-104 compatible code, so that the position error of GPS of up to several tens of meters can be corrected within several meters.

4 schematically shows the configuration of the DGPS reference station of the present invention.

Referring to FIG. 4, the DGPS reference station 200 of the present invention transmits the RTCM SC-104 code, which is the DGPS correction information for correcting the position error of the GPS, from the DGPS monitoring station 300, and the data receiver 210. Receive this in real time. The data receiver 210 encodes the DGPS correction information of the RTCM SC-104 code received from the DGPS monitoring station 300 in real time according to the above-described format method and formats the KDGPS_DMB data to be suitable for the DMB method. Then, the DGPS correction decoder 240 decodes a signal formatted with KDGPS_DMB data so as to comply with the DMB scheme, and simultaneously decodes and corrects the position error information of the GPS received through the GPS receiving antenna from the GPS receiving positioning apparatus 230. Then, it is configured to transmit it to the data transmitter 250 for transmitting to the DMB receiver of the receiving system through the DGPS data transmitting station 260 of the DMB transmission system. Here, the data transmitter 250 may include the position information of the DGPS reference station in the DGPS correction information and transmit the data to the DGPS data transmitting station 260. The location information of the reference station may include latitude, longitude, and height information of the satellite.

5 is a diagram illustrating in more detail the configuration of a terminal 100 that receives DGPS correction information and performs position correction according to an embodiment of the present invention.

Referring to FIG. 5, the terminal 100 of the present invention includes a configuration of a GPS receiver 110, a DMB receiver 120, a terminal storage unit 150, and a terminal control unit 160.

The GPS receiver 110 receives location information from a plurality of satellites and calculates location information of the terminal 100 based on the location information. The location information collected by the GPS receiver 110 may be transmitted to the terminal controller 160.

The DMB receiver 120 may be included to support the digital broadcast reception function of the terminal 100. As described above, the DMB receiver 120 may receive the DGPS correction information in the DMB format and transmit it to the terminal controller 160.

The terminal storage unit 150 stores the DGPS correction information 153 and the position correction program 151 provided by the respective DGPS reference stations 210, 220, and 230. In this case, the stored DGPS correction information 153 may be information decoded in the RTCM SC-104 type by the DGPS decoder included in the terminal controller 160.

The terminal controller 160 supports overall signal processing and data transfer associated with driving the terminal 100. For example, the terminal controller 160 may control to receive the GPS receiver 110 activation request from the user or to activate the GPS receiver 110 according to preset schedule information. When the GPS receiver 110 is activated, the terminal controller 160 may control to activate the DMB receiver 120. The terminal controller 160 may transmit the DGPS correction information received by the DMB receiver 120 to the DGPS decoder. The terminal controller 160 includes a DGPS decoder. The DGPS decoder decodes the DGPS correction information received in the DMB format received by the DMB receiver 120 into the RTCM SC-104 type, which is a GPS type. In addition, the DGPS decoder may support to temporarily store the decoded RTCM SC-104 type DGPS correction information in the terminal storage unit 150. Thereafter, the terminal controller 160 may error correct the position information received by the GPS receiver 110 using the decoded DGPS correction information 153. For this purpose, the terminal controller 160 may include a configuration as shown in FIG. 6.

FIG. 6 is a diagram illustrating in more detail the configuration of the terminal controller 160 of the terminal 100 of FIG. 5.

Referring to FIG. 6, the terminal controller 160 includes a terminal location information collecting unit 161, a reference station location information collecting unit 1163, and a position correcting unit 165.

The terminal location information collecting unit 161 activates the GPS receiver 110 when an input signal for requesting the location information collection of the terminal 100 is generated, and activates the GPS receiver 110 of the terminal 100. Control to collect location information. For example, the terminal location information collecting unit 161 may control to activate the GPS receiver 110 when the navigation function is activated, the map information display function for checking the current location is output, or the specific location or place search function is activated. . In addition, the terminal location information collecting unit 161 may control to activate the GPS receiver 110 and collect location information of the terminal 100 at predefined intervals under a user's agreement to support the location-related function of the terminal 100. . The terminal location information collecting unit 161 transmits the current location information collected through the GPS receiver 110 to the location correcting unit 165.

The reference station position information collecting unit 1163 is configured to collect the DGPS correction information 153. The reference station location information collection unit 1163 receives alarm information on the activation of the GPS receiver 110 from the terminal location information collection unit 161 and controls the DMB receiver 120 to be activated when the information is received. The reference station location information collecting unit 1163 supports receiving DGPS correction information provided by a plurality of DGPS reference stations received through the DMB receiver 120. As described above, the reference station location information collecting unit 1163 may control the DMB type DGPS correction information to be decoded to the GPS type by using the DGPS decoder. The decoded DGPS correction information 163 may be temporarily stored in the terminal storage unit 150 under the control of the reference station position information collecting unit 1163 and transmitted to the position correction unit 165. Meanwhile, the reference station location information collecting unit 1163 first decodes the position information of the reference stations described in some data fields of the received DGPS correction information, that is, the KDGPS_DMB_LOCATION area, and stores the corresponding information together with the ID information of the reference stations. ) Can be delivered. Thereafter, the reference station position information collecting unit 1163 may decode the information described in the KDGPS_DMB data field of the DGPS correction information designated by the position correcting unit 165 and transmit it to the position correcting unit 165.

The position correction unit 165 transmits the DGPS transmitted from the reference station of the position closest to the current position collected by the GPS receiver 110 among the DGPS correction information 153 transmitted by the reference station position information collecting unit 1163. The correction information 153 is selected. The position correction unit 165 may correct the position information received by the GPS receiver 110 based on the DGPS correction information 153 transmitted by the reference station. Here, the position correction unit 165 calculates the current position information of the terminal 100 by applying the actual distance value included in the DGPS correction information 153 and compares it with the position information received by the GPS receiver 110. This reduces the error rate. The corrected position information calculated by the position corrector 165 may be provided to the position based function of the terminal 100.

7 is a view for explaining the location information method of the present invention.

Referring to FIG. 7, the terminal controller 160 of the terminal 100 of the present invention may perform power distribution to each component of the terminal 100 using the power supplied in step S101. Next, the terminal controller 160 checks whether a DGPS correction request occurs in step S103 according to a user request or according to preset schedule information. That is, the terminal controller 160 can check whether the activation request for the GPS receiver 110 occurs. When the GPS receiver 110 activation request does not occur in this step, the terminal controller 160 performs a corresponding function of the terminal 100 in step S105 according to an input signal or schedule information. For example, the terminal controller 160 may control to perform a file play function or a broadcast reception function.

Meanwhile, when an event for requesting activation of the GPS receiver 110 occurs in step S103, the terminal controller 160 receives a plurality of reference station information in step S107. To this end, the terminal controller 160 may perform power supply for activating the DMB receiver 120 and receive information of a predetermined specific region, for example, an FIC region, from among the information received by the DMB receiver 120. In operation S109, the terminal controller 160 extracts location information of reference stations. That is, the terminal controller 160 can extract DGPS correction information described in the DMB type described in the FIC region. The terminal controller 160 decodes the DMB type information into the DGPS type information by using the DGPS decoder.

Thereafter, the terminal controller 160 checks the location information of the reference stations in the DGPS correction information 153 provided by the reference stations, and closes the nearest terminal from the current terminal 100 location information received by the GPS receiver 110 in step S111. Select the reference station. When the nearest reference station is selected, the terminal controller 160 performs position correction based on the DGPS correction information of the nearest reference station in step S113. Next, the terminal controller 160 checks whether or not the GPS receiver 110 is terminated in step S115, and if not, branches to the step S107 according to a predetermined period or at a user's request and supports to perform the following process again.

As described above, the position correction function of the present invention checks the nearest reference station based on the current position of the terminal 100 and receives the GPS receiver 110 based on the DGPS correction information provided by the reference station. It may support to perform the position correction of the position information. Accordingly, the present invention can support minimizing the magnitude of the error caused by the separation distance by using the DGPS correction information of the reference station located relatively close.

On the other hand, the position correction function according to the embodiment of the present invention described above may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer-readable recording medium. At this time, the computer-readable recording medium may include program commands, data files, data structures, and the like, alone or in combination. On the other hand, the program instructions recorded on the recording medium may be those specially designed and configured for the present invention or may be available to those skilled in the art of computer software.

The computer-readable recording medium includes a magnetic recording medium such as a magnetic medium such as a hard disk, a floppy disk and a magnetic tape, an optical medium such as a CD-ROM and a DVD, a magnetic disk such as a floppy disk, A magneto-optical media, and a hardware device specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. The program instructions also include machine language code, such as those generated by the compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention.

In the above description of the preferred embodiments of the position correction function according to an embodiment of the present invention through the specification and drawings, although specific terms have been used, it is only easy to explain the technical details of the present invention and to help understanding of the invention. It is only used in a general sense for this purpose, the present invention is not limited to the above-described embodiment. That is, it is apparent to those skilled in the art that various embodiments based on the technical idea of the present invention are possible.

The present invention relates to a method and a system for correcting a position of a DGPS, and a terminal and a device supporting the same. The present invention provides a method of determining a distance between a plurality of reference stations and a terminal in the process of performing the position estimation of the terminal. Based on the information provided by the reference station, the terminal's position correction is supported more precisely.

Accordingly, the present invention can support to provide various location-based technologies more precisely based on more precise position estimation, thereby preventing work loss or error due to incorrect position calculation, as well as providing accurate work instruction or work performance. have.

10: position correction system 100: terminal
110: GPS receiver 120: DMB receiver
150: terminal storage unit 160: terminal control unit
210, 220, 230: DGPS Reference Countries

Claims (15)

A plurality of DGPS reference stations for providing DGPS correction information including its location information;
A terminal for selecting a DGPS reference station closest to a current position among the plurality of DGPS reference stations based on the location information of the reference stations and performing position correction based on DGPS correction information transmitted from the corresponding DGPS reference station;
Position correction system of the DGPS, characterized in that it comprises a. A GPS receiving positioning device for receiving location information from a satellite;
A data receiver for receiving data from the DGPS monitoring station;
A DGPS correction decoder for generating DGPS correction information based on the position information received by the GPS receiving positioning device and the data received by the data receiver;
And a data transmitter for transmitting the DGPS correction information to a data transmitting station so that the DGPS correction information can be transmitted in a DMB format, and writing the position information of the reference station to the DGPS correction information. 3. The method of claim 2,
The DGPS correction information
A DGPS reference station, characterized in that being written in the FIC area of the DMB transmission frame structure and transmitted. 3. The method of claim 2,
The DGPS correction information
And a latitude, longitude information and height information of the reference station. 3. The method of claim 2,
The data sending station
DGPS reference station, characterized in that for transmitting the DGPS correction information of the RTCM SC-104 format to the DMB packet format. A GPS receiver for receiving location information transmitted from a satellite;
A DMB receiver for receiving DGPS correction information including location information of reference stations from a plurality of DGPS reference stations;
A terminal control unit which checks the reference station nearest to the current location based on the position information of the reference stations included in the DGPS correction information and corrects the position information received by the GPS receiver based on the DGPS correction information provided by the reference station. ;
Terminal supporting position correction, characterized in that it comprises a. The method according to claim 6,
The DGPS correction information
A terminal supporting position correction, wherein the terminal is written and received in the FIC region of the DMB transmission frame structure. The method according to claim 6,
The DGPS correction information
And a latitude, longitude information, and height information of the reference stations. The method according to claim 6,
The terminal controller
And a DGPS decoder for converting the DGPS correction information transmitted in the DMB packet format to the RTCM SC-104 format. Transmitting, by a plurality of reference stations, DGPS correction information including their location information to one terminal;
Correcting, by the terminal, location information received from the GPS receiver based on DPGS information provided by the reference station nearest to the current location based on the location information of the reference station;
Position correction method comprising a. 11. The method of claim 10,
The DGPS correction information
12. A position correction method characterized by being written in the FIC area of a DMB transmission frame structure and transmitted and received. 11. The method of claim 10,
The DGPS correction information
And latitude, longitude information, and height information of the reference stations. 11. The method of claim 10,
And transmitting, by the reference station, the DGPS correction information of the RTCM SC-104 type to a data transmitting station for transmission by converting the DGPS correction information into a DMB format. 11. The method of claim 10,
And converting, by the terminal, the DGPS correction information transmitted in the DMB packet format to the RTCM SC-104 format. The computer-readable recording medium which recorded the program which performs the method of any one of Claims 10-14.

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