KR20240001063A - Positioning system and method based on multi-band RSSI - Google Patents

Abstract

The present invention relates to a multi-band received signal strength indicator (RSSI)-based positioning system and method for positioning a target based on a multi-band received signal strength indicator (RSSI). The present invention includes the steps of a location determination device receiving the reception frequency strength of a multi-band wireless signal transmitted by a target from a plurality of readers; and calculating the location of the target using the received frequency intensity received by the location determination device.

Description

Positioning system and method based on multi-band reception frequency intensity {Positioning system and method based on multi-band RSSI}

The present invention relates to positioning technology, and more specifically, to a positioning system based on a multiband received frequency strength that performs positioning for a target based on a multiband received signal strength indicator (RSSI), and It's about method.

With the development of mobile communication terminals such as smartphones, it has become possible to interact with surrounding communication equipment and devices using various communication means and sensors built into mobile communication terminals. Mobile communication terminals not only transmit and receive wireless signals for phone calls, but also acquire geographic information through reception of GPS signals. Additionally, with the spread of wireless routers, they can be used to communicate with wireless routers fixed at known locations. It became possible to obtain indirect location information.

Indoor/outdoor location positioning technology using wireless (RF) signals is continuously evolving and is being used in various fields such as materials/inventory, safety, health, entertainment, and shopping. However, sensors such as GPS have limitations regarding outdoor use and battery usage management, and Bluetooth generally has the disadvantage of requiring additional equipment to be installed/managed.

Indoor positioning technology (Indoor Positioning System) using mobile communication terminals can be classified in a variety of ways depending on location accuracy, available service area, applicable services, applicable sensors, etc. For example, based on location accuracy and available service area, base stations, Wi-Fi, inertial navigation, high-sensitivity GNSS (Global Navigation Satellite System), UWB (Ultra Wide Band), RFID (Radio Frequency Identification), pseudosatellite, ultrasound, It is classified as a positioning technology that utilizes various physical resources such as infrared, geomagnetic fields, and cameras.

Although various positioning technologies using mobile communication terminals have been introduced, positioning error rates still occur due to the human body permittivity of the user using the mobile communication terminal and surrounding interference substances.

Registered Patent Publication No. 10-2157391 (registered on September 11, 2020)

Therefore, the purpose of the present invention is to provide a positioning system and method based on multiband reception frequency intensity that can reduce the positioning error rate depending on the dielectric constant of targets, including users.

In order to achieve the above object, the present invention includes the steps of a location determination device receiving the reception frequency strength of a multi-band wireless signal transmitted by a target from a plurality of readers; and calculating the location of the target using the received frequency intensity received by the location determination device.

The multi-band wireless signal may include a first wireless signal in the 125K band, a second wireless signal in the 900MHz band, and a third wireless signal in the 2.4GHz band.

In the receiving step, the received frequency strength of the received multi-band wireless signal is the first received frequency strength for the received first wireless signal, the second received frequency strength for the received second wireless signal, and the received It may include a third reception frequency strength for the third wireless signal.

In the calculating step, the positioning device calculates a first position of the target using the first received frequency strength, calculates a second position of the target using the second received frequency strength, and calculates the third received frequency. calculating a third position of the target by intensity; and calculating the final position of the target using the first to third positions calculated by the position determination device.

In the step of calculating the final position of the target, the position determination device may calculate the center point of the first to third positions as the final position of the target.

The step of calculating the final position of the target includes selecting, by the position determination device, one of the first to third positions as a candidate position for the final position of the target; and calculating, by the position determination device, the final position of the target by correcting the candidate position with the remaining positions excluding the candidate position.

In the selecting step, the location determination device may select a candidate location by considering environmental factors surrounding the target at the time of performing location determination.

The surrounding environmental factors may include whether the location where the target is located is crowded with people, where there are buildings, humidity of the location where the target is located, and weather.

The present invention also includes the steps of a plurality of readers receiving a multi-band wireless signal from a target; calculating the reception frequency strength of the multi-band wireless signal received by the plurality of readers; A positioning device receiving received frequency strengths calculated from the plurality of readers; and calculating the location of the target using the received frequency intensity received by the location determination device.

And the present invention includes a target that transmits a multi-band wireless signal; a plurality of readers that receive a multi-band wireless signal from the target, calculate a reception frequency strength for the received multi-band wireless signal, and transmit the calculated reception frequency strength; and a positioning device that receives received frequency strengths calculated from the plurality of readers and calculates the location of the target using the received received frequency strengths.

According to the present invention, by performing positioning for a target based on multi-band RSSI, the position of the target can be determined more accurately than performing positioning using a single frequency band.

The positioning device according to the present invention performs positioning on the target based on multi-band RSSI, thereby reducing the positioning error rate due to environmental factors around the target, and thus can more accurately position the target. . In other words, since the location determination device calculates the location of the target by considering environmental factors around the target, it can more accurately determine the location of the target.

Figure 1 is a block diagram showing a location determination system based on multiband reception frequency intensity according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the location determination device of FIG. 1.
Figure 3 is a flowchart of a location determination method based on multiband reception frequency intensity according to an embodiment of the present invention.
FIG. 4 is a detailed flowchart of the step of calculating the location of the target in FIG. 3.
Figure 5 is a detailed flowchart of the step of calculating the final position of the target in Figure 4.

It should be noted that in the following description, only the parts necessary to understand the embodiments of the present invention will be described, and descriptions of other parts will be omitted without departing from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as limited to their usual or dictionary meanings, and the inventor should use the concept of terminology appropriately to explain his/her invention in the best way. It must be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined clearly. Therefore, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent the entire technical idea of the present invention, and therefore, various equivalents can be substituted for them at the time of filing the present application. It should be understood that there may be variations.

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

Figure 1 is a block diagram showing a multi-band RSSI-based location determination system according to an embodiment of the present invention.

Referring to FIG. 1, the multi-band RSSI-based positioning system 100 according to this embodiment is a system that calculates the location of the target 10 based on multi-band RSSI.

The location determination system 100 according to this embodiment includes a target 10, a plurality of readers 20, and a location determination device 30. The target 10 transmits a multi-band wireless signal. The plurality of readers 20 receive multi-band wireless signals from the target 10, calculate RSSI for the received multi-band wireless signals, and transmit the calculated RSSI. Then, the location determination device 30 receives the RSSI calculated from the plurality of readers 20 and calculates the location of the target 10 using the received RSSI.

Here, the target 10 is a communication terminal carried by the positioning target and transmits a multi-band wireless signal. For example, the target 10 may include a mobile communication terminal, a tag, etc. When a user is equipped with a target 10, the target 10 may be a mobile communication terminal used by the user or a tag worn by the user. Alternatively, the target 10 may be a tag stored in a mobile communication terminal used by the user.

The multi-band wireless signal includes a first wireless signal in the 125K band, a second wireless signal in the 900MHz band, and a third wireless signal in the 2.4GHz band.

A plurality of readers 20 receive multi-band wireless signals transmitted from the target 10. The plurality of readers (20) include a first reader (21), a second reader (22), a third reader (23),... , includes the nth reader (24; n is a natural number of 2 or more). Among the plurality of readers 20 , nearby readers 20 that can receive wireless signals from the target 10 receive multi-band wireless signals from the target 10 .

Among the plurality of readers 20, the reader 20 that receives the multi-band wireless signal from the target 10 calculates RSSI for the received multi-band wireless signal. The reader 20 transmits the calculated RSSI to the location determination device 30. The RSSI of the received multi-band wireless signal includes a first RSSI for the first received wireless signal, a second RSSI for the received second wireless signal, and a third RSSI for the third received wireless signal.

Additionally, the location determination device 30 is a communication terminal that communicates with a plurality of readers 20 and may include, for example, a gateway, a server, etc. The location determination device 30 calculates the location of the target 10 using the first to third RSSI received from the plurality of readers 20. The positioning device 30 performs positioning for the target 10 based on multi-band RSSI, and finally calculates the position of the target 10 by considering environmental factors around the target 10.

The positioning device 30 according to this embodiment will be described with reference to FIGS. 1 and 2 as follows. Here, FIG. 2 is a block diagram showing the location determination device 30 of FIG. 1.

The location determination device 30 according to this embodiment includes a communication unit 31, a storage unit 33, and a control unit 35.

The communication unit 31 communicates with a plurality of readers 20. The communication unit 31 receives multi-band RSSI from a plurality of readers 20 under the control of the control unit 35.

The storage unit 33 stores a program necessary for controlling the operation of the positioning device 30 and data generated during execution of the program. The storage unit 33 stores an executable program for calculating the location of the target 10 based on multi-band RSSI. The storage unit 33 may store the calculated current location of the target 10 or store the movement trace of the target 10 based on the calculated location of the target 10.

And the control unit 35 includes a microprocessor that performs overall control of the positioning device 30 (100). The control unit 35 calculates the location of the target 10 based on the multi-band RSSI from the plurality of readers 20.

The control unit 35 can calculate the position of the target 10 as follows.

First, the control unit 35 calculates the first to third positions based on multiband RSSI. That is, the control unit 35 calculates the first position of the target 10 using the first RSSI. The control unit 35 calculates the second position of the target 10 using the second RSSI. And the control unit 35 calculates the third position of the target 10 using the third RSSI.

And the control unit 35 calculates the final position of the target 10 using the calculated first to third positions.

At this time, the 125K band of the first wireless signal has excellent short-range interference characteristics. The 900 MHz band of the second wireless signal has excellent diffraction and long-distance transmission characteristics. And the 2.4GHz band of the third wireless signal has excellent straight-line frequency characteristics.

Therefore, in this embodiment, the final position of the target 10 is calculated by utilizing the excellent characteristics of each band in combination, so that the position of the target 10 can be determined more accurately than performing positioning using a single frequency band. You can.

The control unit 35 may calculate the final position of the target 10 as follows based on the first to third positions.

For example, the control unit 35 may calculate the center point of the calculated first to third positions as the final position of the target 10.

Alternatively, the control unit 35 selects one of the first to third positions as a candidate position for the final position of the target 10. And the control unit 35 can calculate the final position of the target 10 by correcting the candidate position with the remaining positions excluding the candidate position. That is, the control unit 35 can calculate the final position of the target 10 by selecting a candidate position by giving weight to one of the first to third positions and then correcting the candidate position with the remaining unselected positions.

When selecting a candidate location, the control unit 35 selects the candidate location by considering environmental factors surrounding the target 10 at the time of performing location determination of the target 10. The excellent characteristics of each band explained earlier cause errors in the position value calculated based on the RSSI of the band depending on surrounding environmental factors.

Therefore, the control unit 35 according to this embodiment can calculate the final location of the target 10 more accurately by selecting a candidate location in consideration of surrounding environmental factors. Here, RSSI is known to be affected by the dielectric constant and moisture of surrounding objects. For this reason, at least one of the surrounding environmental factors, such as whether the location where the target 10 is located is crowded with people, where there are buildings, the humidity of the location where the target 10 is located, and the weather, is considered.

For example, if the target 10 is a tag worn by the user, signal distortion may occur in the wireless signal transmitted from the tag due to the dielectric constant of the user. For this reason, when positioning the target 10 using RSSI of a single frequency band, the accuracy of the positioning may be reduced.

Therefore, the control unit 35 according to this embodiment calculates the first to third RSSI in the 125K band, 900MHz band, and 2.4GHz band, respectively, and then reflects the excellent characteristics of each band according to surrounding environmental factors to target 10. By calculating the final location, the accuracy of location determination can be improved.

The positioning method using the positioning system 100 according to this embodiment will be described with reference to FIGS. 1 to 3 as follows. Here, Figure 3 is a flowchart of a multi-band RSSI-based location determination method according to an embodiment of the present invention.

First, in step S10, the plurality of readers 20 receive a multi-band wireless signal from the target 10. Here, the target 10 transmits a first wireless signal in the 125K band, a second wireless signal in the 900MHz band, and a third wireless signal in the 2.4GHz band. The reader 20 receives first to third wireless signals transmitted from the target 10.

Next, in step S20, the plurality of readers 20 calculate RSSI for the received multi-band wireless signal. That is, the reader 20 calculates the first to third RSSI for the received first to third wireless signals, respectively.

Next, in step S30, the location determination device 30 receives the RSSI calculated from the plurality of readers 20. That is, the location determination device 30 receives the first to third RSSIs from the plurality of readers 20, respectively.

And in step S40, the location determination device 30 calculates the location of the target 10 using the received RSSI. That is, the location determination device 30 calculates the location of the target 10 from the first to third RSSIs respectively received from the plurality of readers 20.

At this time, the position of the target 10 according to step S40 can be calculated as shown in FIGS. 1 and 4. Here, FIG. 4 is a detailed flowchart of the step of calculating the position of the target 10 of FIG. 3.

First, in step S41, the position determination device 30 calculates first to third positions. That is, the location determination device 30 calculates the first location of the target 10 using the received first RSSI. The location determination device 30 calculates the second location of the target 10 using the received second RSSI. And the location determination device 30 calculates the third location of the target 10 using the received third RSSI.

And in step S43, the positioning device 30 calculates the final position of the target 10 using the calculated first to third positions.

At this time, in step S43, the positioning device 30 may calculate the center point of the first to third positions as the final position of the target 10.

Alternatively, the final position of the target 10 according to step S43 can be calculated as shown in FIGS. 1 and 5. Here, FIG. 5 is a detailed flowchart of the step of calculating the final position of the target 10 of FIG. 4.

First, in step S431, the positioning device 30 selects one of the first to third positions as a candidate position for the final position of the target 10. At this time, when selecting a candidate location, the location determination device 30 selects the candidate location by considering environmental factors surrounding the target 10 at the time of performing location determination of the target 10. For example, the location determination device 30 considers at least one of the surrounding environmental factors such as whether the location where the target 10 is located is a location with many people, a location where a building is located, or the humidity and weather of the location where the target 10 is located. You can choose a location.

And in step S433, the positioning device 30 calculates the final position of the target 10 by correcting the candidate position with the remaining positions excluding the candidate position.

Meanwhile, the embodiments disclosed in the specification and drawings are merely provided as specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is obvious to those skilled in the art that in addition to the embodiments disclosed herein, other modifications based on the technical idea of the present invention can be implemented.

10: Target
20: Reader
30: Location determination device
31: Department of Communications
33: storage unit
35: control unit
100: Location determination system

Claims (8)

A positioning device receiving a received signal strength indicator (RSSI) of a multi-band wireless signal transmitted by a target from a plurality of readers; and
Calculating the location of the target using the received frequency intensity received by the location determination device;
A location determination method based on multiband reception frequency intensity including. According to paragraph 1,
The multi-band wireless signal includes a first wireless signal in the 125K band, a second wireless signal in the 900MHz band, and a third wireless signal in the 2.4GHz band,
In the receiving step,
The received frequency strength of the received multi-band wireless signal is the first received frequency strength for the first received wireless signal, the second received frequency strength for the received second wireless signal, and the received third wireless signal. A location determination method based on multiband reception frequency intensity, comprising a third reception frequency intensity. The method of claim 2, wherein the calculating step includes:
The location determination device calculates a first position of the target using the first received frequency strength, calculates a second position of the target using the second received frequency strength, and calculates a first position of the target using the third received frequency strength. 3 steps for calculating the position; and
calculating the final position of the target using first to third positions calculated by the position determination device;
A location determination method based on multiband reception frequency intensity, comprising: The method of claim 3, wherein in calculating the final position of the target,
Wherein the positioning device calculates the center point of the first to third positions as the final position of the target. The method of claim 3, wherein calculating the final position of the target comprises:
selecting, by the location determination device, one of the first to third locations as a candidate location for the final location of the target; and
Calculating the final location of the target by the location determination device correcting the candidate location with positions other than the candidate location;
A location determination method based on multiband reception frequency intensity, comprising: The method of claim 5, wherein in the selecting step,
The location determination device selects a candidate location in consideration of environmental factors surrounding the target at the time of performing location determination,
A location determination method based on multi-band reception frequency intensity, characterized in that it considers whether the location where the target is located is a location where there are many people, where there are buildings, humidity of the location where the target is located, and weather as the surrounding environmental factors. . A plurality of readers receiving a multi-band wireless signal from a target;
Calculating a received signal strength indicator (RSSI) for multi-band wireless signals received by the plurality of readers;
A positioning device receiving received frequency strengths calculated from the plurality of readers; and
Calculating the location of the target using the received frequency intensity received by the location determination device;
A location determination method based on multiband reception frequency intensity including. A target that transmits a multi-band wireless signal;
A plurality of readers that receive a multi-band wireless signal from the target, calculate a received signal strength indicator (RSSI) for the received multi-band wireless signal, and transmit the calculated received frequency strength; and
a location determination device that receives received frequency strengths calculated from the plurality of readers and calculates the location of the target using the received received frequency strengths;
A positioning system based on multi-band reception frequency intensity.

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