KR100992871B1 - Differential GPS Information Transmission System and Receiving System Utilizing DRM - Google Patents

Abstract

The present invention relates to a high-precision location information transmission system and a reception system utilizing digital radio mondale (DRM) for correcting errors of up to several tens of meters due to the fifth dimension of a global positioning system (GPS) to several meters.

To this end, the present invention formats and transmits the RTCM SC-104 code, which is the correction information for DGPS, to be suitable for the DRM method, and the terminal receives and converts the RTCM SC-104 compatible code to correct the GPS error of up to several tens of meters. In the high-precision positional information transmission system, the format (contents of the correction information data for DGPS), wherein the KDGPS_DRM data packet is composed of a 24-bit data head and 40-bit data codes, the 24-bit data The head is located at the head of the data field in KDGPS_DRM format, and the 6-bit message type code and 13 bits required for KDGPS_DRM in two words (30 bits / word) appearing at the beginning of all message formats defined in RTCM SC-104. Message information reference time code and frame size code of 5 bits, and the 40 bits data codes are required for transmitting KDGPS_DRM information provided by RTCM SC-104. Six data are encoded to abbreviately transmit messages No. 1 and No. 2, which are key error correction information, among the 40-bit DGPS information for each satellite provided by the RTCM SC-104. The correction information is received from the satellite and the data receiver for transmitting the RTCM SC-104 code, which is the DGPS correction information for correcting the GPS position error, and receiving the data in real time from the DGPS monitor station and the satellite and the DGPS correction information received from the data receiver. It includes a DGPS correction decoder for decoding and correcting the error information of the GPS receiver positioning device for receiving the received position signal, and a data transmitter for receiving the data corrected by the DGPS correction decoder to send to the DRM receiver through the DRM transmission system It is possible to provide a high-precision location information transmission system using the DRM.

GPS, car, DRM, location information

Description

High-precision location information transmission system and reception system using DRM {Differential GPS Information Transmission System and Receiving System Utilizing DRM}

The present invention relates to a high-precision location information transmission system and a reception system using a digital radio mondale (DRM). The present invention relates to a digital radio mondale (DRM) for correcting errors of several tens of meters due to the fifth dimension of a GPS. The present invention relates to a high-precision location information transmission system and a reception system using

With the development of satellite communication technology, GPS (Global Positioning System), which is a positioning system using satellites, has been developed, but the position coordinates acquired by the GPS receiver have errors up to 100 meters due to various zero-dimensional people such as SA (selectable availability). do. To overcome this error, various correction methods (DGPS: Differential GPS) are used. That is, the DGPS receiver receives the DGPS information through the downlink from the DGPS reference station by performing an uplink requesting DGPS data to the DGPS reference station through a commercial wireless communication network, and then applying it to the GPS receiver. do. Then, the GPS receiver corrects the error of up to several tens of meters existing by various fifth-order persons according to the DGPS information and corrects it to about one meter to indicate the exact position of the moving object.

In the case of the commercial wireless communication network used for such a correction method, a large number of relay base stations (Gap Fillers) are required to cover a large area with a small cell radius, and the frequency band is high from 800 MHz to several GHz, such as diffraction. Not only are the radio conduction characteristics weak, but most of the data must be transmitted 1: 1 or data broadcast using Short Message Service (SMS) .In this case, the amount of data that can be transmitted is limited, An uplink is required, which increases the cost of occupying the call channel.

Recently, in order to improve the above problems, according to the developed high-precision position correction information transmission method and transmission system and receiver using the Republic of Korea Patent No. 10-0570710 developed, the compatibility with the RTCM SC-104 code, which is the correction information for DGPS There has been proposed a technique for performing position correction by encoding a format suitable for the FM DARC (Data Radio Channel) method having a decoding and decoding the same in a receiver.

However, since the conventional FM DARC (Data Radio Channel) service is modulated at a data rate of 16 kbps by using a Least Minimum Shift Keying (LMSK) modulation method with a center frequency of 76 KHz, the service is made up to 1.2. Compared to the service using the DMB broadcasting network that can transmit data up to mbps, the frequency usage efficiency is significantly lower.

In addition, this technology, which is an existing method, is expected to be converted to digital in the future by the digitalization plan of the broadcast, and thus, it is required to secure an alternative means.

In case of using the terrestrial DMB (TDMB) broadcasting network, the reception quality is better in the receiving area but the service coverage is narrower than that of the medium wave. Problems still exist.

Accordingly, the present invention has been made to improve the above problems, and by implementing the transmission of the correction information for DGPS using a DRM (Digital Radio Mondale) broadcasting network, the technical quality compared to using other commercial wireless communication networks such as wireless data The purpose of the present invention is to provide a high-precision location information transmission system using terrestrial DRM that improves and enables the use of DGPS services at low cost.

Another object of the present invention is to provide a high-precision positional information receiving system utilizing DRM that corrects the GPS error of several tens of meters by receiving the positional correction data transmitted from the transmission system by the DRM receiver.

The objects of the present invention are not limited to the above-mentioned objects, and other objects that are not mentioned will be apparent to those skilled in the art from the following description.

In order to achieve the above object, according to an aspect of the present invention, the RTCM SC-104 code, which is the correction information for DGPS, is formatted to be suitable for the DRM method and transmitted, and is received by the terminal and converted into an RTCM SC-104 compatible code. In the high-precision position information transmission system capable of correcting a GPS error of up to several tens of meters, the format (contents of the correction information data for DGPS) is a KDGPS_DRM data packet having a 24-bit data head and 40-bit data codes. The 24-bit data head is located at the head of the KDGPS_DRM format data field and is required for KDGPS_DRM in two words (30 bits / word) appearing at the beginning of all message formats defined in RTCM SC-104. It consists of a 6-bit message type code, a 13-bit message information reference time code, and a 5-bit frame size code. The 40-bit data codes are obtained from RTCM SC-104. Six data necessary for transmission of KDGPS_DRM information provided are encoded to abbreviate transmission of messages 1 and 2, which are key error correction information, among the 40-bit DGPS information for each satellite provided by RTCM SC-104. In addition, the formatted correction information is a DGPS received from the data receiver and the data receiver for transmitting the RTCM SC-104 code, which is the DGPS correction information for correcting the position error of the GPS at the DGPS monitor station, and receiving the data in real time. The DGPS correction decoder which decodes and corrects the error information of the GPS receiver positioning device that receives the correction information and the position signal received from the satellite, and receives the corrected data from the DGPS correction decoder and transmits it to the DRM receiver through the DRM transmission system. High precision location information transmission system using DRM, characterized in that it comprises a data transmitter Can be provided.

According to another aspect of the present invention, in the high-precision position information receiving system for correcting the position error of the GPS received by the DRM receiver according to the received correction information for DGPS, KDGPS_DRM scheme of the DRM additional broadcasting received through the DRM receiver The DGPS data decoder converts the correction information for DGPS into an RTCM SC-104 compatible code and transmits the same to the DGPS receiving system, and the DGPS data decoder includes information of the RTCM SC-104 omitted from the data head of the KDGPS_DRM type correction information data for DGPS. Are replaced with 0, and the first 8 bits of the preamble are replaced with 66hex defined in RTCM SC-104, and the information for each satellite provided by RTCM SC-104 omitted from the data code is replaced with 0 for each parity. Encoding and decoding the bit by parity check that detects and corrects an error by assuming that the bit is even for the designated bit, And a GPS receiver positioning device that receives a GPS position signal received through a GPS receiver antenna and DGPS correction information decoded through the DGPS data decoder, corrects an error of the GPS position signal and outputs the corrected position data. It provides a high-precision location information receiving system using the DRM characterized in that.

According to the present invention, the following effects can be expected.

The present invention can secure a wide service coverage by performing DGPS service using a DRM broadcasting system replacing the existing FM broadcasting network, and can be used for precision navigation systems of ships and aircrafts as well as vehicles.

In addition, compared to the 1: 1 data transmission of a commercial wireless network, all receivers can simultaneously receive the same data without limiting the number of receivers using the service.

In addition, in the case of using a conventional commercial wireless communication network, the data is transmitted by request of necessary data, whereas in the case of DRM broadcasting, when data is required, only the data that is being broadcast is received. There is no need for an up link, so there is no time lag or communication charges.

In addition, since DGPS data preferably has a wide service area, the DGPS data can be used in almost all nations such as major cities when using the DRM broadcasting network.

In addition, since DGPS data is often required to be received in a mobile environment such as a car, it must be effectively received even in mobile reception. Thus, in the case of DRM broadcasting, the reception performance is excellent even at 200Km or more.

In addition, the reception coverage is wider than that of DMB, and has a peculiar synergistic effect that smooth reception is possible in many reception environments with mountainous and tall buildings.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a diagram illustrating a structure of a DRM digital radio broadcasting system for a high precision position information transmission system using DRM according to the present invention, and FIG. 2 is a diagram of a DRM for a high precision position information transmission system using DRM according to the present invention. 3 is a diagram illustrating a transmission frame structure, FIG. 3 is a diagram showing a structure of a KDGPS_DRM data packet for a high-precision location information transmission system using DRM according to the present invention, and FIG. 4 is a diagram showing the use of DRM according to an embodiment of the present invention. 5 schematically illustrates a high-precision location information transmission system, and FIG. 5 schematically illustrates a high-precision location information receiving system using DRM according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment according to the present invention.

A method of transmitting high-precision location information using DRM according to the present invention will be described with reference to FIGS. 1 to 5.

First, in order to correct the position error of the GPS, the requirements for the transmission of the signal for high-precision position information (DGPS) are as follows. That is, (1) All the terminals in the receiving area should receive the signal without bottleneck without limiting simultaneous reception. (2) Correction information should be transmitted in the shortest period possible without the receiver's request. (If the transmission request is required every time the DGPS signal is received, it is inefficient due to reception delay and UP link communication cost.) (3) It should have as much service coverage and excellent data reception as possible. (4) Low usage fee and terminal price should be low. (5) In the case of the system using the existing FM broadcasting network, it will be converted to digital in the future according to the digitalization plan of the broadcasting, so it is required to secure an alternative means.

Using the DRM broadcasting system for the above requirements can be satisfied as follows. In other words, DRM (Digital Radio Mondale) broadcasting system was developed after DMB (Digital Multimedia Broadcasting) and is a system capable of broadcasting in both short-wave and medium-wave bands, and is currently in the stage of starting commercial service in Europe and the United States. In countries where DRM-type digital radio service is used, it can save enormous cost and time and provide quick service when securing DGPS correction information and securing separate transmission frequency and permit or constructing transmission system. In addition, DRM broadcasting system has a wider reception coverage than terrestrial DMB, so it can be more smoothly received in mountain and high-rise buildings.

1, the DRM broadcasting system structure for the high-precision position information transmission system using the DRM according to the present invention, the transmission channel using the DRM is largely FAC (Fast Access Channel), Service Description Channel (SDC), It is divided into a main service channel (MSC), and typical video, audio, and data are transmitted using the MSC. FAC and SDC are two parts of DMB's Fast Information Channel (FIC) function (Note * DRM was developed after DMB). FAC transmits information such as channel bandwidth for fast scanning of receiver. The SDC transmits decoding and multiplexing configuration information of the MSC (see FIG. 1 DRM broadcast system structure).

Here, the DRM digital radio broadcasting is available in two regions of shortwave (3 ~ 30MHz) and medium frequency band (526.5 ~ 1606.5KHz). In particular, low-power service using terrestrial wave and broadband broadcasting using long-distance high-wave propagation characteristics is possible for short distance broadcasting of less than 30MHz in urban area, and provides various parameters to suit each purpose. That is, it provides various options for adjusting service quality and robustness to provide desired services. In the medium-wave short-range terrestrial mode, it is possible to service higher sound quality with lower power transmission than conventional analogue, and better reception rate can be secured by effective error protection technology. In addition, in the medium-wave long-distance upper wave mode, the mode is designed to utilize the reflected wave of the ionosphere for long-distance transmission. In addition, DRM can service four programs simultaneously on one channel. For example, autonomy can be provided to serve one program of high quality or to divide into four languages of low quality. In addition, the DRM is capable of a single frequency network (SFN), and in the case of a multi-frequency network (MFN), an automatic frequency selection function (AFS) is provided according to a change of a corresponding service channel for each region. When moving in the service area, the service of the same broadcaster or another service of the broadcaster is automatically changed to a better signal frequency. The AFS list is transmitted through the DRM signal and consists of information such as region and program schedule when and where the same broadcast is broadcasted. The AFS list may include information to connect to AM, FM, DAB services, not just DRM broadcasts. Such a function can be usefully used when a broadcaster provides a service nationwide or internationally. Therefore, the receiver must support the above functions and include a function of strengthening a received signal by combining the same broadcasts of different frequency bands, thereby improving reception performance. On the other hand, as a data service other than audio in DRM, simple text or image transmission and two-way service are possible as audio additional information, and in addition to broadcasting additional information, data service can be provided through connection with an external device independently of the broadcast and received in a broadcast. It is also possible to have a business model that provides services in connection with device applications such as external PCs or PMPs that can utilize the data. In addition, the frequency characteristics of the DRM service, in order to effectively respond to various environments according to various variables that are applied differently according to the terrestrial or upper-wave transmission, that is, electrical noise, Doppler effect or multipath interference, etc. Branch transmission mode is defined. Transmission mode A is used for short-wave bands below 28 MHz where near-field, long-wave, medium-wave, or line-of-sight (LOS) is secured, and transmission mode B is used for medium and short-wave bands in the national service range. In the national range of shortwave bands requiring more robust transmission, and finally, transmission mode D can be used for national range of shortwave band services requiring the highest robustness. Among the four modes, A corresponds to a case where the propagation environment is good and D applies to the worst case environment. The worse the propagation environment, the lower the transmission efficiency at the expense of audio quality and the higher the detection and recovery (error correction coding) to ensure the robustness of the signal. In addition, the frequency efficiency of the DRM system is designed so that various parameters can be determined and utilized according to a radio wave environment and a broadcast use. Effective transmission capacity varies from 4.8Kbps to 72Kbps, and transmission capacity per unit frequency is up to 3.6bps / Hz. When using 9KHz bandwidth, transmission capacity can be 13.1Kbps ~ 30.9Kbps depending on the error correction level.

Referring to Figure 2, looking at the transmission frame structure of the DRM for the high-precision location information transmission system using the DRM in accordance with the present invention, in the DRM scheme, packetized data service is possible, synchronous, asynchronous stream mode or file Unit transfer is possible. The basic packet is composed of an 8-bit header, an n-byte data field, and a 16-bit CRC. The maximum size of data is 8215 bytes. The first bit of the header represents the first bit and the second bit represents the last bit. The next two bits indicate the packet number, the next one indicates whether the packet is padded, and the remaining three bits indicate the number of packets based on eight.

The cyclic redundancy check (CRC) constituting the data packet applies the following equation.

G16 = x ^ 16 + x ^ 12 + x ^ 5 + I

The padding of the packet is set to 0, and the padding packet indicator is set to 1 (see the transmission frame structure of FIG. 2 DRM).

Therefore, in the present invention, the DGPS correction information is formatted to be suitable for the DRM method by using the transmission requirements of the DGPS signal and the features of the DRM broadcasting system, and the terminal receives the RTCM SC. It is proposed to use the DRM broadcasting system to transmit DGPS correction information by converting to -104 compatible code to correct GPS error from several tens of meters to several meters. This method is defined as KDGPS (KoreanDGPS) _DRM format.

Referring to FIG. 3, referring to the structure of a KDGPS_DRM data packet for a high precision location information transmission system using DRM according to the present invention, a DGPS data packet to be transmitted using a DRM includes a 24-bit head and 40 bits per satellite. It consists of data codes that are assigned one by one.

In addition, the 24-bit head is located at the head of the data field of the KDGPS_DRM format and is KDGPS_DRM among two words (total 60 bits: 30 bits / word) information appearing at the beginning of all message formats defined in the RTCM SC-104. 6 bits of message type, 13 bits of message information reference time (Modified Z-count), and 5 bits of length (frame of frame) can be encoded in total of 24 bits. That is, as shown in the following [Table 1], of the type and size of the information represented by the two words corresponding to the head of the RTCM SC-104, only the information required when restoring to the RTCM SC-104 code in the DRM receiver It is selected and defined in the header of the DGPS packet.

As shown in [Table 1], the header information of KDGPS_DRM in the present invention is 8 bits of Preamble, 10 bits of Station ID, 3 bits of Sequence No., 3 in header information of RTCM SC-104 which is a total of 60 bits. It omits a bit of station health and a parity of 12 bits to make a total of 24 bits.

Meanwhile, Message type (DGPS message type) and contents defined in RTCM SC-104 are shown in [Table 2] below.

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, It is set to a state such as undefined or retired. In the present invention, KDGPS_DRM may transmit message information # 1 (Fixed_differential GPS corrections) and # 2 (Fixed_delta differential GPS corrections).

The modified Z-count included in the data head indicates a reference time of the message information, and means a start time of the next message when transmitted from a pseudo signal generator. This information differs in the Z-count and scale of the GPS signal (RTCM; 0.6 seconds, GPS; 6 seconds) because it takes into account the variable length of RTCM information. In addition, the length of frame represents the frame size of the RTCM message, the unit is a 30-bit word used in the GPS signaling system.

The KDGPS data code, which occupies 40 bits in the KDGPS_DRM data packet block, is used to abbreviately transmit messages 1 and 2 (see [Table 2]), which are key error correction information, among the DGPS information provided by the RTCM SC-104. Set. In addition, as shown in the information of RTCM SC-104 Message type 1 (refer to [Table 3] and FIG. 3), the information corresponding to 40 bits per satellite is transmitted. It can be configured as a data field. At this time, data is loaded by the number of satellites provided with error correction information, and other data is replaced with a FILL code filled with bits of 1 and 0 repeated, and each 40-bit data code is configured as shown in FIG. 3.

In addition, the data codes include six items such as Scale factor and Satellite ID as information required for transmitting KDGPS_DMB information provided by RTCM SC-104 Message type 1, and the precision is 16-bit pseudorange correction (PRC). In the case of 0.02 meters, the range rate correction (RRC) of 8 bits is set to 0.002 meters per unit time (sec). Each of these required data bits is shown in Table 2 below.

In addition, when converting the format of the KDGPS_DRM scheme in the present invention to the RTCM SC-104 compatible code in the DRM receiver, it follows the following format.

Preamble (8 bits), Station ID (10 bits), Sequence No. (3 bits), Station health (3 bits), information omitted from the two headers (60 bits total) that appear as headers in all messages of the RTCM SC-104 ) And Parity (12 bits) are replaced with 0, and the first 8 bits of Preamble are replaced with the values of 66hex defined in RTCM SC-104 (see Table 1).

In the DGPS information type received at the DRM receiver and added with the elimination information, the error is assumed by assuming that the "Haming Code" defined in ICD-GPS-200 is an even number for the designated bit. Parity check for detecting and correcting) to restore information in the original RTCM SC-104 format.

Therefore, in the present invention, the DGPS correction information is formatted and transmitted to be suitable for the DRM method, and the terminal receives and converts it to an RTCM SC-104 compatible code so that the GPS position error of up to several tens of meters can be corrected within several meters. Do it.

The high-precision location information transmission system and the reception system using the DRM in this manner are schematically illustrated in FIGS. 4 and 5.

Referring to Figure 4, looking at the high-precision position information transmission system using the DRM according to an embodiment of the present invention, RTCM SC which is correction information for DGPS for correcting the position error of the GPS in the DGPS monitor station 100 Transmit the code -104 and receive it in real time at the data receiver 110. The data receiver 110 encodes the DGPS correction information of the RTCM SC-104 code received from the DGPS monitor station 100 in real time according to the above-described format method and formats the KDGPS_DRM data to be suitable for the DRM method. Then, the DGPS correction decoder 140 decodes a signal formatted with KDGPS_DRM data so as to be suitable for the DRM method, and simultaneously decodes and corrects the position error information of the GPS received through the GPS receiving antenna from the GPS receiving positioning device 130. After that, it is configured to transmit the data back to the data transmitter 150 for transmitting to the DRM receiver 220 of the receiving system through the DGPS data transmitting station 160 of the DRM transmitting system.

Also, referring to FIG. 5, referring to the high-precision positional information receiving system using DRM according to an exemplary embodiment of the present invention, the mobile unit receives this signal in a state where correction information for DGPS is transmitted through a DRM broadcasting network. In order to receive the KDGPS_DRM signal from the DRM receiver 220, the DGPS data decoder 230 decodes (decodes) the KDGPS_DRM signal, converts it into a DGPS correction information signal of an RTCM SC-104 compatible code, and sends it to the GPS receiving positioning apparatus 250. Output Then, the GPS receiving positioning device 250 corrects the GPS position information of the error of up to several tens of meters received through the GPS receiving antenna 240 by using the DGPS correction information signal, and outputs the corrected position data so that the user has an error of several meters. It is possible to check the position of the moving object within the range.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1 is a diagram illustrating a structure of a DRM digital radio broadcasting system for a high precision location information transmission system using DRM according to the present invention.

2 is a diagram illustrating a transmission frame structure of a DRM for a high precision location information transmission system using a DRM according to the present invention.

3 is a diagram illustrating a structure of a KDGPS_DRM data packet for a high-precision location information transmission system using DRM according to the present invention.

4 is a diagram schematically showing a high-precision location information transmission system using DRM according to an embodiment of the present invention.

5 is a diagram schematically showing a system for receiving high-precision position information using DRM according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: DGPS monitor station 110: data receiver

120: GPS receiving antenna 130, 250: GPS receiving positioning device

140: DGPS correction decoder 150: data transmitter

160: DGPS data transmission station 210: reception antenna

220: DRM receiver 230: DGPS data decoder

240: GPS receiving antenna

Claims (2)

RTCM SC-104 code, which is the correction information for DGPS, is formatted and transmitted to be suitable for the DRM method, and the terminal receives it and converts it into RTCM SC-104 compatible code to correct GPS error of up to several tens of meters. In the information transmission system, In the format (contents of the correction information data for DGPS), the KDGPS_DRM data packet is composed of a 24-bit data head and a 40-bit data code. The 24-bit data head is located at the head of the KDGPS_DRM format data field, and the 6-bit message required for KDGPS_DRM in two words (30 bits / word) appearing at the beginning of all message formats defined in RTCM SC-104. It consists of a type code, a 13-bit message information reference time code, and a 5-bit frame size code. The 40-bit data codes are six pieces of data necessary for transmitting the KDGPS_DRM information provided by the RTCM SC-104, and the number 1 error correction information, which is the core of the 40-bit DGPS information for each satellite, provided by the RTCM SC-104. And encoded to abbreviate message 2 and In addition, the formatted correction information is a data receiver for transmitting the RTCM SC-104 code, which is the DGPS correction information for correcting the position error of the GPS at the DGPS monitor station, and receiving the data in real time, and the DGPS correction received at the data receiver. A DGPS correction decoder for decoding and correcting error information of a GPS receiver positioning device that receives information and a position signal received from a satellite, and for receiving the corrected data from the DGPS correction decoder and transmitting the received data to a DRM receiver through a DRM transmission system. High precision location information transmission system using a DRM, characterized in that it comprises a data transmitter. In the high precision position information receiving system for correcting the position error of the GPS received by the DRM receiver in accordance with the received correction information for DGPS, A DGPS data decoder for converting KDGPS_DRM type DGPS correction information of the DRM additional broadcasting received through the DRM receiver into an RTCM SC-104 compatible code and transmitting the same to the DGPS receiving system; The DGPS data decoder replaces the information of the RTCM SC-104 omitted from the data head of the KDGPS_DRM type DGPS correction information data with 0, and replaces the first 8-bit preamble with a value of 66hex defined in the RTCM SC-104. And encoding and decoding through parity check, which detects and corrects an error by replacing each information of each satellite provided by RTCM SC-104 omitted from the data code with 0, assuming each parity bit is even for the designated bit. , In addition, a GPS receiving positioning device for receiving the GPS position signal received through the GPS receiving antenna and the DGPS correction information decoded through the DGPS data decoder to correct the error of the GPS position signal and outputs the corrected position data; High precision location information receiving system using the DRM.

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