KR20240050620A - Positioning correction system generating gnss positioning correction information and control method thereof - Google Patents

Abstract

The present invention relates to a positioning correction system that generates GNSS positioning correction information and a control method thereof. The positioning correction system that communicates with a GNSS reference station that generates GNSS (Global Navigation Satellite System) error information according to the present invention collects GNSS error information received from a GNSS reference station belonging to each preset unit area and calculates the GNSS error information for each unit area. a positioning correction information generation unit that generates positioning correction information; an area mapping unit that maps the positioning correction information generated by the positioning correction information generation unit to a mobile communication network area identifier corresponding to each unit area; and a transmission control unit that controls the positioning correction information mapped to each mobile communication network area identifier by the area mapping unit to be unidirectionally transmitted to the receiving terminal.

Description

Positioning correction system that generates GNSS positioning correction information and its control method {POSITIONING CORRECTION SYSTEM GENERATING GNSS POSITIONING CORRECTION INFORMATION AND CONTROL METHOD THEREOF}

The present invention relates to a positioning correction system and a control method thereof, and more specifically, to a positioning correction system that generates GNSS positioning correction information and a control method thereof.

GNSS (Global Navigation Satellite System) refers to a global satellite navigation system and encompasses all satellite positioning systems.

These GNSS include GPS (Global Positioning System) developed and operated by the U.S. Department of Defense, Russia's GLONASS (GLObal NAvigation Satellite System), the European Union's Galileo, and China's BeiDou.

However, since this GNSS is a system that uses artificial satellites to determine positioning, as described above, various errors may occur.

For example, the GNSS satellite error itself can cause delays and biases in satellite signals, satellite time errors, satellite orbit errors, and phase shifts of satellite antennas.

In addition, the positioning signal generated by the GNSS satellite and heading to the Earth must pass through the ionospheric layer and the tropospheric layer. As radio waves pass through both layers, signal delay occurs and the resulting ionospheric and tropospheric errors occur. It can happen.

Various methods have been proposed to correct these GNSS errors, the most representative of which is the use of a reference station installed at a fixed location.

In other words, a reference station for GNSS error correction is installed at a fixed location, and the GNSS error is confirmed by comparing the location information calculated from the GNSS positioning information at the reference station with the installation location of the reference station.

However, currently in Korea, these reference stations are used to generate and utilize nationwide correction information, but this has the problem of generating many errors for each location depending on weather conditions.

In addition, conventionally, such correction information is provided through two-way communication with the receiving terminal, but there is a problem that time delay may occur during this two-way communication process.

Registered Patent No. 10-1869731

The present invention was created to solve the above-described conventional problems, and its purpose is to provide a positioning correction system and control method for generating GNSS positioning correction information that allows more precise GNSS positioning correction information to be transmitted more quickly to a receiving terminal. is to provide.

In order to achieve the above object, the control method of a positioning correction system that communicates with a GNSS reference station that generates GNSS (Global Navigation Satellite System) error information according to the present invention is to use the information received from the GNSS reference station belonging to each preset unit area. collecting GNSS error information and generating positioning correction information for each unit area; mapping the positioning correction information generated in the above step to a mobile communication network area identifier corresponding to each unit area; It includes the step of controlling the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to the receiving terminal.

Here, the step includes distinguishing types of the generated positioning correction information; It may include controlling the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to the receiving terminal according to the period for each type.

Here, when a GNSS error greater than a preset size occurs as a result of determination based on GNSS error information received from a GNSS reference station belonging to a specific unit area, a step of resetting the range of the unit area may be further included.

Here, collecting weather information; The method may further include resetting the range of at least one unit area based on the collected weather information.

In addition, in order to achieve the above object, the positioning correction system that communicates with a GNSS reference station that generates GNSS (Global Navigation Satellite System) error information according to the present invention is a GNSS received from a GNSS reference station belonging to each preset unit area. a positioning correction information generator that collects error information and generates positioning correction information for each unit area; an area mapping unit that maps the positioning correction information generated by the positioning correction information generation unit to a mobile communication network area identifier corresponding to each unit area; It is configured to include a transmission control unit that controls the positioning correction information mapped to each mobile communication network area identifier by the area mapping unit to be unidirectionally transmitted to the receiving terminal.

Here, the transmission control unit distinguishes the types of positioning correction information generated by the positioning correction information generation unit, and causes the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to the receiving terminal according to the period for each type. You can control it.

Here, when a GNSS error greater than a preset size occurs as a result of determination based on GNSS error information received from a GNSS reference station belonging to a specific unit area, it may further include a zone setting unit that resets the range of the unit area.

Here, a weather information collection unit that collects regional weather information; It may further include a zone setting unit that resets the range of at least one unit area based on the weather information collected by the weather information collection unit.

As described above, according to the present invention, positioning correction information generated based on error information obtained from a GNSS reference station is matched to the TAC for each region and transmitted to the user terminal, thereby enabling more accurate positioning.

In particular, since two-way communication with the user terminal is not required, communication traffic can be minimized and rapid transmission of correction information is possible.

Furthermore, by dynamically changing the range of the unit area containing each GNSS reference station according to weather conditions or the size of the positioning error, more precise positioning can be achieved for each situation.

Additionally, communication traffic generated can be minimized by adjusting the transmission time or period depending on the type of positioning correction information.

1 is a schematic configuration diagram of the entire system including a positioning correction system according to an embodiment of the present invention;
Figure 2 is a block diagram of the positioning correction system of Figure 1;
Figures 3 and 6 are diagrams showing the state in which a unit area including a GNSS reference station is set,
Figures 4 and 5 are diagrams showing regions divided into different TACs,
7 and 8 are control flow diagrams of a positioning correction system according to an embodiment of the present invention.

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

Each embodiment according to the present invention below is only an example to aid understanding of the present invention, and the present invention is not limited to these embodiments. In particular, the present invention may be comprised of a combination of at least one of the individual components, individual functions, or individual steps included in each embodiment.

In particular, for convenience, alphabet letters such as '(a)' are included in some claims, but these alphabet letters do not specify the order of each step.

The schematic configuration of the entire system including the positioning correction system 100 according to an embodiment of the present invention is as shown in FIG. 1.

In the same figure, the GNSS reference station 200 is installed at a fixed location to correct GNSS error and performs the function of generating and transmitting GNSS error information.

Here, GNSS error information is basic information that allows checking or calculating errors that occur during positioning using GNSS satellites, and since it corresponds to known technology, detailed description will be omitted.

The user terminal 300 is a terminal that uses various location-based services through the positioning correction system 100. In particular, it receives GNSS information from the GNSS satellite 400 to determine its own location and also receives positioning information from the positioning correction system 100. It performs the function of receiving correction information and performing positioning correction.

Since the technology itself, in which the user terminal 300 receives GNSS information from the GNSS satellite 400 and performs positioning correction using the additionally acquired positioning correction information, is only known, a detailed description will be omitted.

Meanwhile, in this embodiment, the positioning correction system 100 performs a function of providing positioning correction information based on GNSS error information obtained from the GNSS reference station 200 to the user terminal 300, for example, in mobile communication. It may be integrated into the mobile communication system that provides the service.

For example, this positioning correction system 100 may be configured to include a PPP-RTK server that combines the Precise Point Positioning (PPP) method and Real-Time Kinematic (RTK). An example of the specific functional block is shown in FIG. 2 As shown in

As shown in the figure, the positioning correction system 100 includes a positioning correction information generation unit 110, an area mapping unit 120, a transmission control unit 130, a zone setting unit 140, and a weather information collection unit 150. It may be configured to include.

The positioning correction information generator 110 collects GNSS error information received from the GNSS reference station 200 belonging to each preset unit area and performs a function of generating positioning correction information for each unit area.

In this embodiment, it is assumed that the entire country is divided into unit areas in a predetermined grid shape, an example of which is shown in FIG. 3.

In this drawing, the entire country is shown divided into six unit districts.

As shown in the figure, at least one GNSS reference station 200 may be included within each unit area, and the positioning correction information generator 110 collects GNSS error information from the GNSS reference station 200, and It performs the function of generating positioning correction information by modeling the collected GNSS error information for each unit area.

Since the modeling technology itself using GNSS error information is currently being implemented nationwide, a more detailed explanation will be omitted.

In particular, the positioning correction information may be a single value averaged for each unit area, or furthermore, it may be information containing distance variables and various measurement values for performing positioning correction.

The area mapping unit 120 performs a function of mapping the positioning correction information generated by the positioning correction information generation unit 110 to the mobile communication network area identifier corresponding to each unit area.

Here, the mobile communication network area identifier corresponds to regional information providing mobile communication services.

For example, the mobile communication network area identifier is distinct from the cell ID of each communication base station 310, and at least one communication base station 310 may have the same mobile communication network area identifier.

For example, in the case of an LTE (Long-Term Evolution) network, the telecommunication service provider groups several adjacent eNBs (eNodeBs) and defines them as one TA (Tracking Area). At this time, the TAC (Tracking Area) is a unique value assigned to each TA. Code) may correspond to the mobile communication network area identifier mentioned in the present invention.

Figure 4 shows an example of dividing the country into multiple TACs.

When using FIGS. 3 and 4, the regional mapping unit 120 can map the positioning correction information generated by the positioning correction information generation unit 110 to each other by comparing the location information of each unit area with the location information of each TAC. will be. Here, the location information of each unit area may be included in information received from each GNSS reference station 200, or may be determined and registered in advance.

That is, the positioning correction information generated based on the information received from the GNSS reference station 200 in the first unit area 511 is mapped to TAC1 and received from the GNSS reference station 200 in the second unit area 512. The positioning correction information generated based on the information can be mapped to TAC2.

If TAC is divided in the form shown in FIG. 5, positioning correction information generated based on information received from the GNSS reference station 200 of the first unit area 511 may be mapped to TAC1 and TAC2, respectively. .

The transmission control unit 130 performs a function of controlling the positioning correction information mapped to each mobile communication network area identifier by the area mapping unit 120 to be unidirectionally transmitted to the receiving terminal.

For example, the transmission control unit 130 transmits the positioning correction information mapped to each mobile communication network area identifier by the area mapping unit 120 to each base station, and the base station transmits the positioning correction information to the receiving terminal by broadcasting. This can be controlled as much as possible.

At this time, the transmission control unit 130 may classify the types of positioning correction information generated by the positioning correction information generating unit 110 and then control the information to be transmitted to the receiving terminal at different periods for each type.

For example, errors collected or determined by the GNSS reference station 200 may include satellite clock error, satellite orbit/bias error, tropospheric ionospheric delay error, etc., and the transmission control unit 130 performs positioning correction based on the satellite clock error. Information can be controlled to be transmitted to the user terminal 300 at 5 second intervals, positioning correction information based on satellite orbit/bias error at 30 second intervals, and positioning correction information based on tropospheric ionospheric delay error at 60 second intervals. .

The zone setting unit 140 performs the function of setting or resetting the range (size, number) of the unit zone.

For example, there may be a plurality of GNSS reference stations 200 throughout the country, and the area setting unit 140 may set a certain area combining the plurality of GNSS reference stations 200 as a unit area. The units set in this way are Zones can dynamically change in size or number.

As an example, the area setting unit 140 determines based on the GNSS error information received from the GNSS reference station 200 belonging to a specific unit area, and when a GNSS error greater than a preset size occurs, the range of the unit area may be reset. .

Even if modeling is performed based on GNSS error information received from the GNSS reference station 200 belonging to a specific unit area, if the degree of error is large, the modeling result may be inaccurate.

Therefore, in this case, the zone setting unit 140 readjusts unit zones across the country to reduce the size of the error for each unit zone.

An example of this is shown in Figure 6.

Comparing Figure 6 with Figure 3, it can be seen that the number of unit areas has changed from 6 to 7, and the size of the unit areas has also changed.

Furthermore, the zone setting unit 140 may reset the range of the unit zone according to weather conditions (weather) in a specific area.

In other words, since the state of the atmospheric layer may vary depending on the current weather condition, the scope (size, number, etc.) of the unit area is reset according to the current weather condition.

When modeling using error information received from the GNSS reference station 200, accuracy cannot be maintained throughout the unit area in the modeling results depending on weather conditions, so, for example, units with large changes in weather conditions The area is divided into more details so that modeling can be done in a relatively small range.

To this end, a weather information collection unit 150 that collects regional weather information may be further configured.

The weather information collection unit 150 performs a function of periodically collecting regional weather information by communicating with an external weather information providing server (not shown) and provides the results to the zone setting unit 140.

Hereinafter, the control flow of the positioning correction system 100 according to an embodiment of the present invention will be described with reference to FIGS. 7 and 8.

First, Figure 7 shows a process in which the positioning correction system 100 generates and transmits positioning correction information.

The positioning correction system 100 collects GNSS error information from each GNSS reference station 200 (step S1).

Subsequently, the positioning correction system 100 generates positioning correction information for each unit area (step S3). At this time, a preset algorithm may be applied and a modeling process may be included, most simply, the GNSS standard belonging to each unit area. Positioning correction information based on GNSS error information collected from the station 200 can be averaged and determined as representative positioning correction information for each unit area.

After generating the positioning correction information, the positioning correction system 100 maps the positioning correction information and the corresponding mobile communication network area information (step S5).

Thereafter, the positioning correction system 100 transmits the positioning correction information to the user terminal 300 through one-way communication (for example, broadcasting-type communication) (step S7).

For example, the positioning correction system 100 can map positioning correction information and corresponding mobile communication network area information and then transmit the mapped information to the base station of each mobile communication network to be transmitted periodically.

In this case, for example, each base station may periodically transmit positioning correction information mapped to the TAC to which it belongs so that the user terminal 300 can receive it.

Meanwhile, FIG. 8 shows a process in which the range of a unit area including at least one GNSS reference station 200 is reset.

After collecting GNSS error information (step S1), the positioning correction system 100 determines the positioning error according to the collected error information (step S13).

Next, the positioning correction system 100 checks whether the determined positioning error exceeds a preset value (step S15), and if it exceeds the check result, resets the range of the unit area (step S17).

For example, the positioning correction system 100 can divide a specific unit area in which a large positioning error occurs into a plurality of unit areas.

Although not shown in FIG. 8, after the range of the unit area is readjusted, the positioning correction system 100 can perform the same process as in FIG. 7 again to generate and process new positioning correction information.

Meanwhile, of course, the process of performing each of the above-described embodiments can be performed by a program or application stored in a predetermined recording medium (eg, computer-readable). Here, the recording medium includes all electronic recording media such as RAM (Random Access Memory), magnetic recording media such as hard disks, and optical recording media such as CD (Compact Disk).

At this time, the program stored in the recording medium can be executed on hardware such as a computer or smartphone to perform each of the above-described embodiments. In particular, at least one of the functional blocks of the positioning correction system 100 according to the present invention described above may be implemented by such a program or application.

In addition, the present invention is not limited to the specific embodiments described above, but can be implemented with various changes and modifications without departing from the gist of the present invention. It will be apparent that such changes and modifications are included in the present invention if they fall within the scope of the appended claims.

100: Positioning correction system 200: GNSS reference station
300: User terminal 400: Satellite
110: Positioning correction information generation unit 120: Regional mapping unit
130: transmission control unit 140: zone setting unit
150: Weather information collection unit

Claims (10)

In the control method of a positioning correction system that communicates with a GNSS reference station that generates GNSS (Global Navigation Satellite System) error information,
(a) collecting GNSS error information received from a GNSS reference station belonging to each preset unit area and generating positioning correction information for each unit area;
(b) mapping the positioning correction information generated in step (a) to a mobile communication network area identifier corresponding to each unit area;
(c) A control method of a positioning correction system comprising controlling the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to a receiving terminal. According to paragraph 1,
In step (c),
(c1) classifying the type of positioning correction information generated in step (a);
(c2) A control method of a positioning correction system comprising the step of controlling the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to a receiving terminal according to a period for each type. According to paragraph 1,
Control of the positioning correction system further comprising the step of resetting the range of the unit area when a GNSS error greater than a preset size occurs as a result of determination based on GNSS error information received from a GNSS reference station belonging to a specific unit area. method. According to paragraph 1,
collecting weather information;
A control method for a positioning correction system, further comprising resetting the range of at least one unit area based on the collected weather information. A computer-readable recording medium recording a program for executing the method of any one of claims 1 to 4. An application program stored on a computer-readable recording medium in combination with hardware to execute the method of any one of claims 1 to 4. In a positioning correction system that communicates with a GNSS reference station that generates GNSS (Global Navigation Satellite System) error information,
a positioning correction information generator that collects GNSS error information received from GNSS reference stations belonging to each preset unit area and generates positioning correction information for each unit area;
an area mapping unit that maps the positioning correction information generated by the positioning correction information generation unit to a mobile communication network area identifier corresponding to each unit area;
A positioning correction system comprising a transmission control unit that controls the positioning correction information mapped to each mobile communication network area identifier by the area mapping unit to be unidirectionally transmitted to a receiving terminal. In clause 7,
The transmission control unit distinguishes the types of positioning correction information generated by the positioning correction information generation unit, and controls the positioning correction information mapped to each mobile communication network area identifier to be unidirectionally transmitted to the receiving terminal according to the period for each type. A positioning correction system characterized in that. In clause 7,
A positioning correction system further comprising a zone setting unit that resets the range of the unit zone when a GNSS error greater than a preset size occurs as a result of determining based on GNSS error information received from a GNSS reference station belonging to a specific unit zone. In clause 7,
a weather information collection department that collects regional weather information;
A positioning correction system further comprising a zone setting unit that resets the range of at least one unit area based on the weather information collected by the weather information collection unit.