KR20190007306A - Method and apparatus for measuring location - Google Patents

Abstract

The present invention relates to a method and an apparatus for measuring a location which correct a terminal location by radio fingerprinting to accurately measure the terminal location. According to embodiments of the present invention, the method for measuring a location measures a location of a user terminal by a location measuring server, and comprises: a step of checking a grid area having radio pattern information most similar to radio pattern information received from the user terminal on a radio fingerprint map, and estimating a specific coordinate in the grid area as the location of the user terminal; a step of selecting a wireless signal transmission device located in the vicinity of the user terminal, and calculating a separation distance between the selected wireless signal transmission device and the user terminal; a step of dividing the grid area into a prescribed number of virtual detail grid areas; a step of checking a plurality of separation distance coordinates located at points separated from the location of the selected wireless signal transmission device by the separation distance, and checking detail grid areas where the separation distance coordinates are distributed among the divided detail grid areas; and a step of correcting the location of the user terminal at the specific coordinate in the grid area with the checked detail grid areas.

Description

Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a position location technique, and more particularly, to a position location method and apparatus for measuring a terminal position more accurately by correcting a terminal position measured by a radio wave fingerprinting method.

Recently, as the use of smart phones has increased, a location based service (LBS) market has been activated, which provides various services using location information. The location-based service is a system and service based on location information that utilizes the mobile communication network and IT technology in a comprehensive manner. The location-based service is a system in which various information, such as product information, traffic information, .

Conventionally, a GPS (Global Positioning System) method or a method using a base station of a mobile communication network is widely used as a positioning technique. However, the GPS method generally has an error of several meters or more, and it can not be positioned in buildings or shaded areas such as tunnels. Unlike the GPS method, a method using a base station connected to a user terminal such as a smart phone has an advantage that positioning can be performed both indoors and outdoors. However, since accuracy thereof is not high, only a rough confirmation .

In order to overcome these problems, there is a need for a technique that requires relatively high accuracy and requires a small additional cost. Research on positioning technology using a wireless access point capable of meeting such needs has been actively conducted recently. Since the access points for wireless LAN (WLAN) service are already installed in numerous places, there is no need to additionally install a separate base station, and the geomagnetism can be measured both indoors and outdoors and the geomagnetic pattern is changed according to the fine positional difference This is because of high precision.

There is a radio fingerprinting method as a position measurement method using such a wireless access point or geomagnetism. A typical radio fingerprinting method estimates the position of a user terminal by utilizing a radio wave fingerprint map storing a radio wave propagation pattern for various points in a specific area. When a user terminal as a location measurement object receives a radio signal, the user terminal compares the radio wave pattern of the radio signal received by the user terminal with the radio wave pattern stored in the radio wave fingerprint map, and determines a point having the most similar radio wave pattern as the location of the user terminal . The radio wave fingerprint map divides the area into a predetermined lattice and stores the propagation pattern for each lattice. When positioning the user, a lattice area having a pattern most similar to the radio wave pattern acquired at the user terminal is located at a location Respectively.

However, in the radio fingerprinting method, the accuracy of the user's positional positioning is influenced by how the grid size is determined. When the grid size is large, there is a problem that the probability of aligning the grid in which the user is actually positioned is high, but the positioning precision is low. On the contrary, when the grid size is small, errors may occur due to mapping errors with neighboring grids, the data amount of required radio wave fingerprint maps may increase, and the number of preliminary operations to match the propagation patterns may increase.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional radio wave fingerprinting method, and it is an object of the present invention to precisely correct the position of a user terminal located in a radio wave fingerprinting manner based on a separation distance between a radio signal transmitting device and a user terminal, And a positioning method and an apparatus for finally positioning the positioning apparatus.

Other objects and advantages of the present invention will become apparent from the following description, and it will be understood by those skilled in the art that the present invention is not limited thereto. It will also be readily apparent that the objects and advantages of the invention may be realized and attained by means of the instrumentalities and combinations particularly pointed out in the appended claims.

According to a first aspect of the present invention, there is provided a method for positioning a user terminal in a position location server, the method comprising the steps of: receiving a radio frequency Identifying on a map and estimating a specific coordinate within the grid region as a location of the user terminal; Selecting a radio signal transmitting device located in the vicinity of the user terminal and calculating a separation distance between the selected radio signal transmitting device and the user terminal; Subdividing the lattice region into a number of virtual sub-lattice regions; Confirming a plurality of spacing distance coordinates located at a distance of the distance from the position of the selected radio signal transmitting device and confirming a detailed lattice area in which the distance coordinates are distributed among the subdivided detailed lattice areas; And correcting the position of the user terminal from the specific coordinates in the grating area to the identified grating area.

According to a second aspect of the present invention, there is provided a positioning apparatus comprising: an information obtaining unit for receiving radio wave pattern information from a user terminal; A position estimating unit that identifies a lattice region having propagation pattern information most similar to the propagation pattern information on a radio wave fingerprint map and estimates a specific coordinate within the lattice region as a position of the user terminal; A device selecting unit that selects a wireless signal transmitting device existing in the vicinity of the user terminal and calculates a separation distance between the selected wireless signal transmitting device and the user terminal; And dividing the grid area into a predetermined number of virtual sub-grid areas, checking a plurality of spacing coordinates located at a distance from the position of the selected radio signal transmitting device to the spacing distance, And a position corrector for correcting the position of the user terminal from the specific coordinates in the grid area to the identified grid area by checking the grid area in which the distance coordinates are distributed.

The present invention corrects the estimated user terminal position in the radiofrequency fingerprint map based on the distance between the reliable wireless signal transmission device and the user terminal and finally determines the corrected position as the position of the user terminal, There is an advantage to be able to measure.

In addition, since the present invention proposes a virtual lattice refinement only for a location area of a user terminal estimated in a radio wave fingerprint map and corrects the position of the user terminal to a specific detailed lattice area based on the separation distance coordinates, It is possible to exhibit an effect similar to the above without substantially further subdividing.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and form a part of the specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention. And shall not be construed as limited to such matters.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a configuration of a position location system according to an embodiment of the present invention; FIG.
2 is a diagram showing a configuration of a location location server according to an embodiment of the present invention.
3 is a visualization of a radio wave fingerprint map according to an embodiment of the present invention.
4 is a flowchart illustrating a method of measuring a position of a user terminal in a location location server according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating a process of correcting the position of a user terminal.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, in which: There will be. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram showing a configuration of a position location system according to an embodiment of the present invention; FIG.

1, a position location system according to an embodiment of the present invention includes a plurality of radio signal transmitting devices 310, 320, 330, and 340, a user terminal 100, and a location location server 200 . The user terminal 100 and the location server 200 communicate with each other through a communication network 400. The communication network 400 includes a mobile communication network and a wired communication network.

The wireless signal transmitting devices 310, 320, 330, and 340 are devices that perform wireless communication with the user terminal 100, such as a repeater, an access point, a Bluetooth, and a base station. The wireless signal transmitting devices 310, 320, 330, and 340 continuously transmit wireless signals to provide wireless services to the user terminal 100. Also, the wireless signal transmitting devices 310, 320, 330, and 340 may relay data between a specific server and the user terminal 100. These radio signal transmitting devices 310, 320, 330, and 340 have unique identification information and form a certain service coverage according to the arrival area of the radio signal.

The user terminal 100 is a device capable of carrying and communicating with other user terminals, the location server 200, and the wireless signal transmitting devices 310, 320, 330, and 340 using a communication channel . One embodiment of the user terminal 100 may include, but is not limited to, portable devices such as cell phones, smart phones, and computing devices with Wi-Fi or other wireless transceivers such as tablet computers, notebooks, or the like Do not. In particular, the user terminal 100 generates the propagation pattern information in which the radio signal intensity received from the plurality of radio signal transmitting devices 310, 320, 330, and 340 and the radio signal transmitting device identification information are recorded at the current position, And provides the propagation pattern information to the location location server 200.

The location server 200 confirms the location of the user terminal 100 on the radio wave fingerprint map based on the data received from the user terminal 100 and transmits the location information of the user terminal 100 and the reliable radio signal transmitting devices 310, 330, and 340 to determine the final position of the user terminal 100. [0033] FIG.

2 is a diagram showing a configuration of a location location server according to an embodiment of the present invention.

2, the position location server 200 according to an exemplary embodiment of the present invention locates a position of the user terminal 100 and includes an information obtaining unit 210, a position estimating unit 220, A device selecting unit 230, a position correcting unit 240, and a database 250, which may be implemented by hardware or software, or by a combination of hardware and software.

The position location server 200 may include one or more processors and a memory and the information obtaining unit 210, the position estimating unit 220, the device selecting unit 230 and the position correcting unit 240 may be connected to the processor And stored in the memory in the form of a program capable of implementing the following methods and functions.

The information obtaining unit 210 communicates with the user terminal 100 through the communication network 400 and receives the radio wave pattern information from the user terminal 100.

The database 250 stores a plurality of radio signal transmitting device identification information and a radio wave fingerprint map in which the radio signal intensity of the radio signal transmitting device is divided for each lattice area. Further, the database 250 stores the position coordinate range for each lattice area.

FIG. 3 is a diagram visualizing a radio wave fingerprint map according to an embodiment of the present invention. As shown in FIG. 3, the database 250 stores radio signal transmitting device identification information and signal intensity Pattern information) is recorded.

Also, the database 250 stores the identification information and the location information of the reliable wireless signal transmitting device. Here, the reliable wireless signal transmitting device is a wireless signal transmitting device capable of accurately confirming the position information, and the database 250 stores the identification information and the position information of the reliable wireless signal transmitting device separately for each wireless signal transmitting device. In other words, among the plurality of radio signal transmitting apparatuses, there may exist radio signal transmitting apparatuses installed by other operators or other users, and it is difficult to grasp the installation position of such radio signal transmitting apparatuses. However, the wireless signal transmission device installed through the same service provider can know the installation location, and information (such as location information and identification information) of the wireless signal transmission device is stored in advance in the database 250 as reliable wireless signal transmission device information .

The location estimating unit 220 checks a grid area having the propagation pattern information most similar to the radio wave pattern information received from the user terminal 100 in the radio wave fingerprint map of the database 250 and transmits the center point of the checked grid area to the user terminal 100. [ (100) is located. That is, the position estimating unit 220 preferentially estimates the position of the user terminal 100 based on the radio wave fingerprinting method.

The device selecting unit 230 performs a function of selecting a reliable wireless signal transmitting device. That is, the device selecting unit 230 selects a reliable radio signal transmitting device in the vicinity of the user terminal 100, based on the radio wave pattern information transmitted from the user terminal. The device selecting unit 230 selects a wireless signal transmitting device closest to the user terminal when a plurality of reliable wireless signal transmitting devices exist in the vicinity of the user terminal. The device selecting unit 230 calculates the separation distance between the selected radio signal transmitting device and the user terminal 100. [ At this time, the position correcting unit 230 may measure the separation distance between the user terminal 100 and the selected radio signal transmitting device based on the received signal strength of the radio signal transmitting device measured by the user terminal 100, or The distance between the user terminal 100 and the wireless signal transmitting device may be calculated using a distance measurement method based on a time of flight (ToF).

The position correcting unit 240 performs a function of more precisely correcting the position of the user terminal 100 of the radio wave fingerprinting method estimated by the position estimating unit 220 and positioning the final position of the user terminal 100. [ In detail, the position correcting unit 240 divides the lattice area where the user terminal 100 is located on the radio wave fingerprint map into a certain number of virtual sub-lattice areas to further subdivide the lattice area, A plurality of spacing distance coordinates which are located at a distance of the distance from the position are confirmed. In addition, the position correcting unit 240 confirms the detailed grid region in which the distance coordinate is distributed, and corrects the final position of the user terminal in the detailed grid region. At this time, the position correcting unit 240 may correct the distance coordinates at the closest distance from the center point of the grid area (i.e., the estimated position of the user terminal) to the final position of the user terminal 100. [ In another embodiment, the position correcting unit 240 may calculate an average of all the distance coordinates distributed in the sub-grid region, and then calculate the position of the estimated user terminal 100 (i.e., the center point of the grid region) Can be corrected to the corresponding coordinates. In another embodiment, the position correcting unit 240 may determine whether the sub-grid area in which the distance coordinates are distributed is singular or plural, and if it is a singular, the estimated position of the user terminal 100 is referred to as the sub- As shown in FIG. On the other hand, when the plurality of sub-grid areas having the spacing distance coordinates are discriminated, the position correcting part 240 obtains an average of the plurality of sub-grid area center points, It can be corrected as a final position.

4 is a flowchart illustrating a method of measuring a position of a user terminal in a location location server according to an embodiment of the present invention.

Referring to FIG. 4, the user terminal 100 measures the signal strength received from the plurality of radio signal transmitting devices 310, 320, 330 and 340 at the current position and the signal strengths of the radio signal transmitting devices 310, 320, Obtains the propagation pattern information including the identification information, and transmits the propagation pattern information to the location and location server 200.

Then, the information obtaining unit 210 of the position location server 200 receives the propagation pattern information from the user terminal 100 (S401), and the position estimating unit 220 estimates the propagation pattern information that is the most similar to the propagation pattern information (I.e., center point) of the lattice region is estimated as the location of the user terminal 100 (S403).

Then, the device selecting unit 230 selects one reliable radio signal transmitting device among the radio signal transmitting devices recorded with the propagation pattern information (S405). The device selecting unit 230 compares the radio signal transmitting device identification information recorded in the radio wave pattern information and the reliable radio signal transmitting device information recorded in the database 250 to determine a reliable One radio signal transmitting device can be selected.

When a plurality of reliable radio signal transmitting devices are confirmed among the radio signal transmitting devices recorded in the radio wave pattern information, the device selecting part 230 selects a radio signal transmitting device located closest to the user terminal 100 Can be selected. At this time, the device selecting unit 230 identifies the position of the user terminal 100 estimated by the position estimating unit 220 (i.e., the center coordinates of the lattice region), and based on this position, It is possible to select a radio signal transmitting device that is closest to the position of the user terminal among the transmitting devices.

Next, the device selecting unit 230 confirms the signal strength of the selected radio signal transmitting device from the propagation pattern information, and transmits the signal strength between the user terminal 100 and the selected radio signal transmitting device The separation distance is calculated (S407). That is, the device selecting unit 230 checks the received signal strength (i.e., the received signal strength) of the radio signal transmitting device measured by the user terminal 100, and performs distance measurement based on the received signal strength, The distance between the terminal 100 and the selected radio signal transmitting device can be calculated. Alternatively, the device selecting unit 230 may check the first arriving radio wave signal received from the selected radio signal transmitting device by the user terminal 100, and apply the first arriving radio wave signal to the time-of-flight (ToF) So that the separation distance between the user terminal 100 and the selected radio signal transmitting device can be calculated.

Next, the position correcting unit 240 divides the estimated lattice area as a position of the user terminal 100 into a predetermined number of virtual sub-lattice areas, and calculates a lattice area in which the user terminal 100 is located in the radio- And further subdivided (S409). The number and size of the virtual sub-grid regions may be set in advance.

Next, the position correcting unit 240 determines a plurality of distance coordinates at a distance corresponding to the calculated distance as the center point of the position of the selected radio signal transmitting device (S411). When the plurality of spacing distance coordinates are connected, a circle is formed with a radius corresponding to the spacing distance, and a center point is a mounting position of the selected radio signal transmitting apparatus.

The position correcting unit 240 confirms the detailed lattice area in which the plurality of spacing distance coordinates are distributed (S413), and corrects the position of the user terminal 100 estimated in step S403 in the detailed lattice area (S415). That is, the position correcting unit 240 precisely corrects the position of the user terminal 100 estimated by the radio wave fingerprinting method by pulling the estimated position of the user terminal 100 in the sub-grid region in step S403. The position correcting unit 240 checks the coordinates of the distance that is closest to the position of the user terminal 100 estimated in step S403 (i.e., the coordinates of the lattice center point), and determines the position of the user terminal 100 in step S403 Can be corrected to the distance distance coordinate of the nearest neighboring position that has been confirmed. In another embodiment, the position correcting unit 240 calculates the average of all the distance coordinates distributed in the sub-grid area, and then calculates the position of the user terminal 100 at the position estimated in step S403 Can be corrected by the coordinates. In another embodiment, the position correcting unit 240 checks whether there are a plurality of sub-graticule areas in which the distance coordinates are distributed. If the number of the sub-graticule areas is a single number, the position correcting unit 240 checks the center point of the sub- From the position estimated in step S403 to the center point of the sub-grid area. Meanwhile, the position correcting unit 240 calculates the average of the center points of the plurality of sub-grid regions when the determination result shows that there are a plurality of sub-grid regions in which the distance coordinates are distributed, and sets the position of the user terminal 100 to S403 The coordinates corresponding to the calculated average can be corrected at the position estimated in the step.

FIG. 5 is a diagram illustrating a process of correcting the position of a user terminal.

With reference to FIG. 5, it is explained that the position of the user terminal 100 is corrected.

In FIG. 5, a solid line represents a lattice area of the user terminal 100 estimated by a radio wave fingerprinting method, a dotted line represents an imaginary sub-grid area obtained by dividing the lattice area into quarters, and a dotted line of a circular shape represents a plurality of spacing distance coordinates (55). The center point 56 of the lattice region indicates the position of the user terminal 100 that has been estimated in advance by the position estimation unit 220 in the radio wave fingerprinting manner.

5A, a dotted line 52 in the form of a circle indicating the separation distance coordinates is distributed in the second sub-grid region 52. Accordingly, the position correcting unit 240 estimates The position 55 of the user terminal 100 is corrected to the second sub-grating area 52 and it is determined that the final user position is the sub-2 sub-grating area 52. [ At this time, the position correcting unit 240 adjusts the distance coordinates, which are closest to the center point 55 of the lattice area, from the plurality of distance coordinates included in the second sub-grating area 52 to the user terminal 100 Or correct the center point of the second sub-grating area 52 as the position of the user terminal 100. In this case, In another embodiment, the position correcting unit 240 may calculate an average of a plurality of distance coordinates included in the second sub-grid area 52, and then transmit the coordinates corresponding to the average of the distance coordinates to the user terminal 100).

5B shows a state in which the distance coordinate is distributed in two sub-grating regions. Referring to FIG. 5B, the position modifying unit 240 includes a second sub-grating region 52, And the fourth sub-grid area 54. The user terminal 100 determines the distance between the user terminal 100 and the user terminal 100 as a distance from the center point 56, ). ≪ / RTI > In another embodiment, the position correcting unit 240 calculates an average of the center point of the second sub-grating area 52 and the center point of the fourth sub-grating area 54 in which the separation distance coordinates are distributed, It is possible to correct the corresponding coordinates as the final position of the user terminal 100. Alternatively, the position correcting unit 240 may calculate an average of all the distance coordinates distributed through the second sub-grid region 52 and the fourth sub-grid region 54, Can be corrected as the final position of the wafer 100.

5C shows a state where the distance coordinate is distributed in three sub-grating regions. Referring to FIG. 5C, the position correcting unit 240 corrects the second sub-grating region 52, Of the plurality of spacing distance coordinates distributed through the third sub-grating area 53 and the fourth sub-grating area 54 is the closest distance from the estimated center point 56 as the position of the user terminal 100 The distance coordinate can be corrected to the position of the user terminal 100. In another embodiment, the position correcting unit 240 corrects the center point of the second sub-grating area 52, the center point of the third sub-grating area 53, and the center of the fourth sub- After calculating the average of the center points, the coordinates corresponding to the average can be corrected as the final position of the user terminal 100. Alternatively, the position correcting unit 240 may calculate an average of all the distance coordinates distributed through the second sub-grating area 52, the third sub-grating area 53, and the fourth sub-grating area 54, It is possible to correct the coordinates corresponding to this average as the final position of the user terminal 100.

Meanwhile, in the above-described embodiment, the location estimating unit 220 determines the lattice area having the radio propagation pattern information most similar to the radio wave pattern information received from the user terminal 100 in the radio wave fingerprint map of the database 250, The present invention is not limited to this, and the position estimating unit 220 may determine that the center coordinates of the grid area are located at the positions of the user terminal 100, Location. In other words, the position estimating unit 220 can estimate the center point of the checked grid area as the position of the user terminal 100 based on the previously set estimation algorithm, and calculate the coordinates included in the grid area other than the center point as It may be estimated as the position of the user terminal 100. [

As described above, the position location server 200 according to the present invention can more accurately position the user by correcting the position of the user terminal 100 estimated by the radio wave fingerprinting method. In addition, the position location server 200 according to the present invention performs virtual subdivision only on the position area of the user terminal estimated in the radiofrequency fingerprint map, and corrects the position of the user terminal to a specific sub- The effect equivalent to this can be achieved without dividing the radiofrequency fingerprint map into smaller and more substantial portions.

While the specification contains many features, such features should not be construed as limiting the scope of the invention or the scope of the claims. In addition, the features described in the individual embodiments herein may be combined and implemented in a single embodiment. Conversely, various features described in the singular < Desc / Clms Page number 5 > embodiments herein may be implemented in various embodiments individually or in combination as appropriate.

Although the operations have been described in a particular order in the figures, it should be understood that such operations are performed in a particular order as shown, or that all described operations are performed to obtain a sequence of sequential orders, or a desired result . In certain circumstances, multitasking and parallel processing may be advantageous. It should also be understood that the division of various system components in the above embodiments does not require such distinction in all embodiments. The above-described program components and systems can generally be implemented as a single software product or as a package in multiple software products.

The method of the present invention as described above can be implemented by a program and stored in a computer-readable recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto optical disk, etc.). Such a process can be easily carried out by those skilled in the art and will not be described in detail.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. The present invention is not limited to the drawings.

100: user terminal 200: position location server
210: information acquisition unit 220:
230: device selection unit 240: position correcting unit
250: Database
310, 320, 330, 340: Radio signal transmitting device
400: communication network

Claims (11)

A method for positioning a location of a user terminal in a location location server,
Confirming a lattice region having propagation pattern information most similar to the propagation pattern information received from the user terminal on a radiofrequency fingerprint map and estimating a specific coordinate within the lattice region as a position of the user terminal;
Selecting a radio signal transmitting device located in the vicinity of the user terminal and calculating a separation distance between the selected radio signal transmitting device and the user terminal;
Subdividing the lattice region into a number of virtual sub-lattice regions;
Confirming a plurality of spacing distance coordinates located at a distance of the distance from the position of the selected radio signal transmitting device and confirming a detailed lattice area in which the distance coordinates are distributed among the subdivided detailed lattice areas; And
And correcting the position of the user terminal from the specific coordinates in the lattice region to the verified detailed lattice region. The method according to claim 1,
Wherein the correcting comprises:
A distance distance coordinate corresponding to a distance closest to a specific coordinate within the grid region estimated based on the position of the user terminal is identified and the position of the user terminal is corrected to the identified distance coordinate in the coordinates in the grid region . The method according to claim 1,
Wherein the correcting comprises:
Calculating an average of a plurality of spacing distance coordinates distributed in the detailed grid area and correcting the position of the user terminal to a coordinate corresponding to the calculated average in the specific coordinates in the grid area. The method according to claim 1,
Wherein the correcting comprises:
Wherein if the number of the grid points is one or more, the position of the user terminal is corrected from a specific coordinate within the grid area to a center point of the sub-grid area. Way. 5. The method of claim 4,
Wherein the correcting comprises:
Wherein the average of the center points of the plurality of sub-graticule areas in which the spacing distance coordinates are distributed is calculated and then the position of the user terminal is divided into a plurality of sub- And corrects the coordinates to a coordinate corresponding to the calculated average at a specific coordinate. 6. The method according to any one of claims 1 to 5,
Wherein the step of selecting the radio signal transmitting device comprises:
And a radio signal transmitting device capable of confirming the position information among the radio signal transmitting devices included in the propagation pattern information is selected. An information obtaining unit for receiving the propagation pattern information from the user terminal;
A position estimating unit that identifies a lattice region having propagation pattern information most similar to the propagation pattern information on a radio wave fingerprint map and estimates a specific coordinate within the lattice region as a position of the user terminal;
A device selecting unit that selects a wireless signal transmitting device existing in the vicinity of the user terminal and calculates a separation distance between the selected wireless signal transmitting device and the user terminal; And
A plurality of spacing distance coordinates located at a distance from the position of the selected radio signal transmitting device to the spacing distance are identified after subdividing the grid area into a predetermined number of virtual sub- And a position correcting unit for correcting the position of the user terminal from the specific coordinates in the lattice area to the verified detailed lattice area by checking the detailed lattice area in which the spacing distance coordinates are distributed. 8. The method of claim 7,
Wherein the position correcting unit comprises:
A distance distance coordinate corresponding to the closest distance from the coordinates in the grid area estimated as the position of the user terminal is confirmed and the position of the user terminal is corrected to the identified distance coordinate in the specific coordinates in the grid area . 8. The method of claim 7,
Wherein the position correcting unit comprises:
Calculates an average of a plurality of spacing distance coordinates distributed in the detailed grid area and corrects the position of the user terminal to a coordinate corresponding to the calculated average in the specific coordinates in the grid area. 8. The method of claim 7,
Wherein the position correcting unit comprises:
Wherein if the number of the grid points is one or more, the position of the user terminal is corrected from a specific coordinate within the grid area to a center point of the sub-grid area. Device. 11. The method of claim 10,
Wherein the position correcting unit comprises:
Wherein the average of the center points of the plurality of sub-graticule areas in which the spacing distance coordinates are distributed is calculated and then the position of the user terminal is divided into a plurality of sub- And corrects the coordinates to a coordinate corresponding to the calculated average at a specific coordinate.

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