WO2017082605A1

WO2017082605A1 - System for detecting position of missing child using portable terminal and method therefor

Info

Publication number: WO2017082605A1
Application number: PCT/KR2016/012770
Authority: WO
Inventors: 강윤정
Original assignee: 강윤정
Priority date: 2015-11-11
Filing date: 2016-11-08
Publication date: 2017-05-18
Also published as: KR20170055357A

Abstract

The present invention relates to a system for detecting the position of a missing child and a method therefor, the method being characterized by comprising the steps of: a portable terminal repeatedly receiving a beacon signal from a beacon, which is provided on the clothes of a child; calculating an actually-measured circle, which indicates the position of the child, on the basis of the received beacon signal; calculating a virtual circle, which indicates the predicted position of the child; and calculating the point of intersection between the actually-measured circle and the virtual circle. The present invention provides information regarding the position of and direction in which a disappearance has occurred, even when the child has moved out of the communication range, such that the missing child can be easily found.

Description

Mia location detection system and method using a portable terminal

The present invention relates to a lost position detection system and a method thereof, and more particularly, to a lost position based system and a method for detecting a lost terminal based on a portable terminal which can be easily identified using a portable terminal possessed by anyone. will be.

The anti-lost / discovery technology has been continuously proposed in close association with the emergence of near / telecommunication technology. For example, NFC-based (Patent registration No. 1343,322, etc.), WiFi-based (Patent Registration (149,634, etc.), RFID tag-based (Korea Patent Publication No. 2014-140217, etc.), Bluetooth-based (Korea Patent Publication No. 2003-65014) New technologies have been developed around various communication protocols and terminals.

Recently, after the release of the iPhone with iBeacon, beacons became a hot item in the IT field. Bluetooth-based iBeacons were introduced as a near-field marketing or payment method, but because of their superior strengths, people are devoted to researching more applications.

In accordance with these technical trends, research on the prevention and detection of lost children using beacon signals has been actively conducted, and the invention entitled "A lost prevention method using wearable Bluetooth beacons and a computer-readable recording medium therefor" has recently been disclosed in Korea Patent Publication. It was released as 2015-0116207. Specifically, a Bluetooth beacon is attached to a child's belongings, such as a hat and shoes, and the beacon signal is monitored in real time by the guardian's smart terminal to confirm that the child is within the protection radius. The technology for intensively searching for missing children's Bluetooth beacons has been introduced through the cooperative operation of people's smart terminals.

The present invention is characterized by how to search for a lost child when the monitor is outside the scope of protection, but it does not reflect the reality in that it proposes a method of interworking with the smart terminals of the surrounding people, communication range of beacons Considering that the radius reaches 70 meters, the limitation of not proposing positioning technology within the protection range is that the possibility of exposure to danger can be excluded even if the child is within the beacon communication range in congested space. have. In addition, if the path of movement of children within the scope of protection is found, it is very helpful to search and track children even if they are outside the scope of protection, but they do not provide useful information within the scope of protection.

Therefore, there is a need for a method of allowing a child's guardian to accumulate useful information within the communication range of the beacon and track its location using only his or her mobile terminal.

(Patent Document 0001) Republic of Korea Registered Patent No.

(Patent Document 0002) Republic of Korea Patent No.1496341

(Patent Document 0003) Republic of Korea Patent Publication No. 2014-0140217

(Patent Document 0004) Republic of Korea Patent Publication No. 2003-0065014

(Patent Document 0005) Republic of Korea Patent Publication No. 2015-0116207

The present invention has been made to solve the above problems of the prior art, by extracting useful information within the communication range of the beacon only with the portable terminal of the guardian, it is easy to determine the location and path of the child within the communication range, communication It is an object of the present invention to provide a system and method that can facilitate tracking of lost children through path prediction even when out of range.

According to one aspect of the present invention, there is provided a method for detecting a lost child position, comprising: repeatedly receiving a beacon signal from a beacon provided in a children's clothing by a portable terminal; (b) after moving the portable terminal, receiving a beacon signal received from the beacon, and calculating a measured circle indicating the location of the child based on the position after the movement of the portable terminal based on the received beacon signal; step; (c) calculating a virtual circle representing the expected position of the child based on the position before the movement of the portable terminal based on the beacon signal received in the step (a) at the reception time of the step (b) ; And (d) calculating an intersection point of the measured circle and the virtual circle calculated in steps (b) and (c). Here, the virtual circle may be formed with a probability density calculated based on the mean and the deviation based on the beacon signal received in the step (a), the intersection of the circle calculated in the step (d) May be calculated as an area to which probability density is applied based on the probability density.

And, if the intersection is not formed in the step (d), it is possible to determine the position of the two circles having the shortest distance as the intersection, the step (a) is geomagnetic information measured by the geomagnetic sensor provided in the children's clothing Further comprising receiving; In the step (b), the direction of movement of the portable terminal may be set toward the semicircle of the expected child position inferred based on the geomagnetic information with respect to the portable terminal, and set to be biased in the center of the semicircle. And, (e) one of the two intersections of the measured circle and the virtual circle can determine the child position based on the strength of the beacon signal measured in the step (b).

In addition, the above object is a lost position detection system according to another aspect of the present invention, the beacon provided in the children's clothing; Based on the signal received from the beacons, the child's position at any point in time is inferred in the form of a virtual circle, and the virtual circle at the same time as the measured circle indicating the measured child's position at the time point after its own position movement It can be achieved by the lost position detection system, characterized in that it comprises a portable terminal for determining the intersection to be formed as a candidate for the child position. The apparatus may further include a geomagnetic sensor provided in the child's clothing, and the portable terminal may receive geomagnetic information measured by the geomagnetic sensor and calculate a moving direction of the child based on the geomagnetic information.

The present invention provides the convenience of identifying the position of a child with one portable terminal in place of a plurality of beacon scanners or portable terminals required for triangulation.

In addition, the location and direction of movement of the child can be provided within the communication range of the beacon, and even when the child is out of the communication range, the missing position and direction information is provided so that the missing child can be easily found.

1 is a conceptual diagram of a lost position detection system according to an embodiment of the present invention;

2A to 2E are conceptual illustrations for explaining a lost position detection algorithm according to an embodiment of the present invention; And

3A to 3E are conceptual diagrams of a lost position detection algorithm according to an embodiment of the present invention when the child moves in a circumferential direction instead of moving away from a certain direction.

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

1 is a conceptual diagram of a lost position detection system according to an embodiment of the present invention.

Referring to FIG. 1, a lost position detection system according to an exemplary embodiment of the present invention includes a beacon module 10 installed in a child's clothing and a portable terminal 20 carried by a guardian.

The beacon module 10 is provided in children's clothes, preferably, is provided to have a certain direction in the space provided in a part of the swimsuit, shoes, etc. rather than the pocket provided in the clothes. Beacon module 10 may further include necessary peripheral devices such as geomagnetic sensors in addition to beacons.

For example, the geomagnetic sensor provided in the garment is fixed to the front of the child to provide geomagnetic information as relative angle information for the magnetic north pole, geomagnetic information can be provided to the outside through the beacon signal.

The mobile terminal 20 may be a tablet, a laptop, etc. in addition to the most widely used smart phone, it is formed to enable the beacon communication function to facilitate communication with the beacon module 10.

The strength of the signal received from the beacon module 10 carried by the child calculates how far the guardian and the child are located, and the candidate position is determined in the form of a circle having a radius of the separation distance.

By continuously or repeatedly inferring the position of the child at any time based on beacon signals received at regular intervals or irregularly, the position of the child can be calculated with one mobile terminal 20 without a plurality of beacon scanners. Make sure

In addition, the portable terminal 20 may include a geomagnetic sensor and determine which direction the child moves based on the geomagnetic information detected by the embedded geomagnetic sensor and the geomagnetic information received from the beacon module 10. That is, the relative position of the mobile terminal 20 and the beacon module 10 with respect to the magnetic north pole is interpreted as the moving direction of the beacon module 10 with respect to the mobile terminal 20. This will determine which direction the child is moving away from, or close to, and allow accurate inferences about the child's location.

2A to 2E are conceptual illustrations for explaining a lost position detection algorithm according to an embodiment of the present invention. Referring to Figure 2 will be described in detail the operating principle of the lost position detection system according to an embodiment of the present invention shown in FIG.

Referring to FIG. 2A, the guardian carries the mobile terminal 20 and is located at the first origin O _A , and the child carries the beacon module 10 and has a distance of ₀ from the first origin O _A. Located at spaced B ₀ . The portable terminal 20 receives the beacon signal from the beacon module 10 at time t = 0, infers that the child's position is on a circumference having a radius d ₀ and obtains _a circle of C ₀ .

Referring to FIG. 2B, it can be seen that at t = 1, the guardian is located at the first origin O _A and the child has moved from B ₀ to B ₁ . Accordingly, the mobile terminal 20 receives the beacon signal from the beacon module 20 at time t = 1, infers that the child's position is on a circumference having a radius d ₁ and obtains a circle of C ₁ .

The change at time t = 2 was similar to that at t = 1.

Referring to FIG. 2C, the guardian is located at the first origin O _A , and the child moves to the position of B ₁ to B ₂ in the same direction, so that the distance from the mobile terminal 20 to the child is d ₂ . Further away. The mobile terminal 20 infers that the child is located on a circumference having a radius of d ₂ and obtains a circle of C ₂ .

The mobile terminal 20 may analyze the movement pattern of the child and infer a probability density of the expected position of the child at any time. For example, if the radius is increasing at regular time intervals from t = 0 to t = 2, it can be inferred that the radius at t = 3 will also increase uniformly. Can be determined.

Referring to FIG. 2D, the mobile terminal 20 infers a virtual circle VC ₃ having a radius d _v3 as the child's position at t = 3.

Referring to FIG. 2E, at t = 3, the portable terminal 20 moves from the first origin O _A to the second origin O _B. Based on the strength of the signal received from the beacon module 10 with respect to the second origin (O _B ), the child's position can obtain a circle of C ₃ whose radius is d ₃ .

The closest position corresponding to the intersection or intersection of the measured circle C ₃ and the virtual circle VC ₃ obtained after moving the position of the portable terminal 20 is determined as the position of the potent child.

As described above, since the virtual circle is represented as an area having a probability density, the intersection of the measured circle C ₃ and the virtual circle VC ₃ may be determined as an area, and the candidate area in FIG. 2E is R. _It is determined by ₁ and R ₂ regions.

Here, the final child's position will be determined by R ₁ .

In Figure 2e the first reference point (O _A) for passing t = 0 in the determined circle (R ₀₎ to traverse the upper right of the line L ₀ in half and is perpendicular to L ₀ and a tangent to the R ₀ L ₁ and L ₂ Since there is no child's position in between, R ₁ is determined as the final child's position.

The geomagnetism information of the beacon module 10 makes it possible to calculate the relative direction of movement of the child. The direction of movement of the child is determined between t = 0 and t = 1, and the position of the child on the C ₀ circumference is determined from the distance between the mobile terminal 20 and the beacon module 10 in that direction. The range will be reduced to a semicircle in the upper right corner of L _{0 that} is perpendicular to and through the origin. This is because the semicircle in the lower left side will move away from the child in the direction of movement.

Next, it can be intuitively understood that the position of the child should be determined between L ₁ and L ₂ as it continues to move in the same direction from the C ₀ circle.

Therefore, the location of the missing child between R ₁ and R ₂ can be finally determined as R 1.

2a to 2e have been described assuming that the child continues to move away in a certain direction, but the position of the beacon is kept constant according to the triangulation method using only one mobile terminal 20 and the geomagnetic sensor built therein In situations, it is possible to quickly measure the position with the child's various movement paths without having to measure simultaneously with two or three devices.

3A to 3E illustrate a conceptual diagram of a lost position detection algorithm according to an embodiment of the present invention when the child moves in a circumferential direction instead of moving away from a certain direction.

As shown in Figures 2a to 2e, the process of Figures 3a to 3e was performed, the only difference is that the child's movement paths B ₀ to B ₃ , that is, directions are different.

3A to 3C, the hypothetical circle VC ₃ at t = 3 is inferred through three samplings from t = 0 to t = 2. In addition, the measured circle C _{3 was obtained} after the position movement of the mobile terminal 20 at actual t = 3.

Now the candidate area around the intersection or closest point of VC ₃ and C ₃ is deduced. Intersections are obtained between 0 and 2, and if there are no intersections, the closest position is considered as an intersection and a candidate area is derived around that point.If there is one intersection, one is determined as a candidate area. In the case of two of these, the final decision is made by selecting one of the two.

In the case of two candidate areas with two intersections, the semicircle of the first circle is first selected as a candidate area in consideration of the moving direction of the child, and then the range of the candidate area is tracked by tracking the moving direction path from the semicircle as the candidate area. You can take steps to reduce it.

While the embodiments of the present invention have been described with some assumptions, those skilled in the art can readily understand that the embodiments of the present invention can be modified without departing from the spirit of the present invention.

Therefore, the protection scope of the present invention should be regarded as equivalent to the equivalents of the invention described in the appended claims, and the embodiments described herein should be regarded as illustrative.

Claims

In the lost position detection method,

(a) the mobile terminal repeatedly receiving a beacon signal from the beacon provided in the children's clothing;

(b) after moving the portable terminal, receiving a beacon signal received from the beacon, and calculating a measured circle indicating the location of the child based on the post-movement position of the portable terminal based on the received beacon signal; Making;

(c) calculating a virtual circle representing the expected position of the child based on the position before the movement of the portable terminal based on the beacon signal received in the step (a) at the reception time of the step (b); step; And

and (d) calculating an intersection of the measured circle and the virtual circle calculated in steps (b) and (c).
The method of claim 1,

The imaginary circle is MIA position detection method characterized in that formed with a probability density calculated based on the average and the deviation based on the beacon signal received in the step (a).
The method of claim 2,

The intersection point of the circle calculated in step (d) is calculated as an area to which probability density is applied based on the probability density.
The method of claim 1,

If the intersection is not formed in the step (d), Mia position detection method characterized in that for determining the position where the two circles have the shortest distance as the intersection.
The method of claim 1,

The step (a) further includes receiving geomagnetic information measured by a geomagnetic sensor provided in the children's clothing;

In the step (b), the movement direction of the portable terminal is set toward the semicircle of the expected child position inferred based on the geomagnetic information based on the portable terminal, and is set to be deflected from the center of the semicircle. Mia location detection method.
The method of claim 2,

The step (a) further includes receiving geomagnetic information measured by a geomagnetic sensor provided in the children's clothing;

In the step (b), the movement direction of the portable terminal is set toward the semicircle of the expected child position inferred based on the geomagnetic information based on the portable terminal, and is set to be deflected from the center of the semicircle. Mia location detection method.
The method of claim 3,

The step (a) further includes receiving geomagnetic information measured by a geomagnetic sensor provided in the children's clothing;

In the step (b), the movement direction of the portable terminal is set toward the semicircle of the expected child position inferred based on the geomagnetic information based on the portable terminal, and is set to be deflected from the center of the semicircle. Mia location detection method.
The method of claim 4, wherein

The step (a) further includes receiving geomagnetic information measured by a geomagnetic sensor provided in the children's clothing;

In the step (b), the movement direction of the portable terminal is set toward the semicircle of the expected child position inferred based on the geomagnetic information based on the portable terminal, and is set to be deflected from the center of the semicircle. Mia location detection method.
The method of claim 5,

(e) Mia position detection method, characterized in that the child position of one of the intersection of the measured circle and the virtual circle is determined based on the intensity of the beacon signal measured in step (b).
In the lost position detection system,

Beacons provided in children's clothing;

Based on the signal received from the beacons, the child's position at any point in time is inferred in the form of a virtual circle, and the virtual circle at the same time as the measured circle indicating the measured child's position at the time point after its own position movement And a portable terminal for determining an intersection to be formed as a candidate for the child's position.
The method of claim 10,

Further comprising a geomagnetic sensor provided in the children's clothing,

The portable terminal receives the geomagnetic information measured by the geomagnetic sensor, and calculates the direction of movement of the child based on the geomagnetic information, Mia position detection system.