KR20100104410A - System and method for pursuit a lost child - Google Patents

Abstract

PURPOSE: A system for tracing a missing child using the size of a location signal transmitted from local distance and a method of the same are provided to sense a missing child occurred within local area, thereby rescuing the missing child in a short time. CONSTITUTION: A missing child occurrence sensor(10) senses occurrence of a missing child by the size of the location signal transmitted from local distance, and generates a missing child occurrence signal. An active location tracer(20) transceives the missing child occurrence sensor and a signal within a broadband area where the missing occurrence signal is occurred, and traces a missing child point into the size and the direction of a received signal. The missing child occurrence sensor includes a location transmitter(11) and a location receiver which generates a location signal periodically(12). If the size of the location signal is less than a critical value, the location receiver generates the missing child occurrence signal.

Description

MIA tracking system and its method {SYSTEM AND METHOD FOR PURSUIT A LOST CHILD}

The present invention relates to a lost tracking system and a method thereof, and more particularly to a lost tracking system and a method capable of accurately tracking and rescue a lost child generated in a short range within a short time.

In recent years, based on the development of wireless communication, a location tracking system that receives a predetermined location signal from the rescued person and tracks its location in order for an emergency rescuer to quickly rescue the rescued person for reasons such as a lost child, kidnapping and distress, etc. It is becoming. Such a location tracking system is a positioning technology that ensures the reliability of generation, transmission and reception of rescue signals and the accuracy of the location of signal generation.

On the other hand, the current positioning technology has a very large error range from the tens of meters to tens of kilometers. When using a GPS (Global Positioning System) that tracks the position using satellite signals, the error may be reduced to within a few meters. However, the GPS positioning problem cannot be used indoors, so there is a problem in the reliability of the GPS. .

Therefore, in recent years, research / development of an active emergency rescue system capable of accurately detecting the position of a target point within a wide range of error for providing a faster and more accurate location tracking system is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a lost tracking system and a method for rapidly detecting and rescue a lost child generated in a short range region.

Another object of the present invention is to provide a lost tracking system and a method for rescuing lost children quickly and accurately.

Mia tracking system for achieving the above object, includes a missing occurrence detector and an active position tracker.

The loss detection sensor detects whether the loss occurs by the magnitude of the position signal transmitted and received at a short distance and generates a loss occurrence signal. According to an embodiment of the present invention, the missing occurrence detector receives a position transmitter periodically generating a predetermined position signal and the position signal transmitted from the position transmitter, and the magnitude of the position signal is less than a preset threshold. And a position receiver for generating the lost signal. Here, the position transmitter and the position receiver are mounted on the portable items of the lost child and the protector, respectively.

The active position tracker tracks the occurrence point of the lost in the magnitude and direction of the received signal by transmitting and receiving signals with the lost occurrence detector in the wide area where the lost occurrence signal. To this end, the active position tracker, a repeater located in the wide area receiving the missing signal, a tracking signal transmitter for transmitting a tracking signal for activating a notification signal from the position transmitter in the wide area, and Receiving the tracking signal and comparing with the size of the predetermined reference area, and includes a location tracking unit for tracking the location of the lost. Here, the tracking signal transmitter transmits the tracking signal to the omnidirectional antenna at a plurality of points, and the location tracker receives the notification signal of the position transmitter activated by the tracking signal at the plurality of points to the directional antenna. In addition, the received signal strength panorama is prepared relative to the received azimuth angle to track the occurrence of the missing point.

On the other hand, according to this embodiment, it is preferable to further include a central control unit for receiving the lost signal through the repeater to move the tracking signal transmitter and the tracking unit to the wide area.

Mia tracking method for achieving the object of the present invention, by receiving a position signal generated from the lost in the near area and comparing the preset threshold value, generating a lost signal, the wide area in which the lost signal generated Generating a tracking signal within the target signal; activating a notification signal for the tracking signal; receiving the notification signal to set a candidate area larger than a preset reference value; Comparing the extents of the regions to track the location of the missing child.

Here, the step of generating the lost signal may be performed by transmitting and receiving the position signal between the position transmitter mounted on the portable device carried by the lost child and the position transmitter mounted on the portable device of the protector. In this case, an active position tracker may be moved between the lost signal generation step and the tracking signal generation step to move the active position tracker to a wide area of the repeater that receives the lost signal, thereby enabling faster lost tracking.

In the notification signal activation step, the notification signal activated by the tracking signal is generated by the position transmitter. Here, the tracking signal is generated by the omnidirectional antenna, and the notification signal is received by the directional antenna.

Between the notification signal activation step and the candidate region detection step, a step of receiving the generated notification signal and creating a reception panorama may be provided to facilitate the rescue team.

If the range of the candidate area is larger than the size of the reference area, the comparison step moves to a new location at the current position and repeats the tracking signal generation step. If the range of the candidate area is smaller than the size of the reference area, The location of the missing occurrence point is determined in the candidate area. At this time, the new location is preferably in a direction in which the size of the received notification signal is relatively large, it is preferable to shorten the tracking time.

According to the present invention having the configuration as described above, first, since the occurrence of the lost in the short-range area can be detected in a short time, it is possible to shorten the time input to the lost structure.

Second, since the location of the lost child can be tracked through the active position tracker, it is possible to quickly and accurately track the lost child. Therefore, the safety of the lost child to be rescued can be secured to the maximum.

Third, even if a lost child is located in a location where a GPS-based service is not provided, such as a room, the location of the lost child can be tracked by signal transmission and reception in a wide area, thereby improving the efficiency of the lost child structure.

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

1 and 2, the position tracking system 1 according to a preferred embodiment of the present invention is composed of a lost occurrence sensor 10 and an active position tracker 20.

The lost child detection sensor 10 detects whether a lost child is generated by a magnitude of a position signal transmitted and received in a short-range area such as a amusement park. To this end, the lost occurrence detector 10 receives a position transmitter 11 for periodically generating a predetermined position signal L1, and a position signal L1 transmitted from the position transmitter 11, and receives the position signal ( When the size of L1) is less than a predetermined threshold value (for example, any one of -60 to -40 dBm), the location receiver 12 generates the lost signal L2.

For reference, in the case of the location tracking system 1 described in the present invention, it is illustrated that the location of the lost child is detected by detecting whether the missing child is detected by the location signal transmitted and received within the short range area, but the present invention is not limited thereto. That is, the position tracking system 1 of the present invention may be modified in that the position tracking based on the position signal transmitted / received in the mid-range or far-field region is possible, not the position signal transmitted / received in the short range region. Accordingly, the threshold range is not limited to the illustrated -60 to -40 dBm, and may vary depending on the usage environment of the position tracking system 1.

Here, the position transmitter 11 is a portable device possessed by the rescue requester, that is, the lost child (C), and is a device that generates a predetermined frequency signal indicating the position of the lost child (C). In the present embodiment, the position transmitter 11 is illustrated as a beacon (Beacon) that can be worn on the wrist of the baby (C) as shown in FIG. In addition, the location receiving unit 12 is also a portable device that can be carried by the guardian of the Mia (C), as shown in Figure 2, in the present embodiment is shown and illustrated as being mounted on a mobile communication terminal, such as a mobile phone or PDA, etc. .

Meanwhile, in the present embodiment, the location transmitter 11 is illustrated as having a rescue requester Mia, and the location receiver 12 is carried by a guardian, but the present invention is not limited thereto. That is, it is obvious that modifications may be possible such that the guardian holds the position transmitter 11 and the position receiver 12 holds the position receiver 12. In this case, a lost signal L2 generated when the reception size of the position signal L1 is less than a threshold value is generated from the lost child having the position receiver 11.

In addition, in FIG. 1, only the position signal L1 generated from the position transmitter 11 is illustrated as the one-way signal transmission to the position receiver 12, but is not limited thereto. For example, it is obvious that the confirmation signal of the position signal L1 received from the position transmitter 11 is generated by the above-described dimension unit 12 and is transmitted to the position transmitter 12, that is, bidirectional signal transmission is also possible. In this case, even when the position receiver 12 is equal to or larger than a predetermined threshold value before the occurrence of the lost signal l2, the interval between the position transmitter 11 and the position receiver 12 may be continuously checked. In addition, both the position transmitter 11 and the position receiver 12 may generate the lost signal L2 by comparing the received signal with a threshold value.

The active position tracker 20 generates a tracking signal L3 in the wide area G estimated as the point where the missing generation signal L2 is generated, thereby losing the tracking signal L3 in the magnitude and direction of the tracking signal L3. The position of the position transmitter 11 as a generation point is tracked. To this end, the active position tracker 20 includes a repeater 21, a tracking signal transmitter 23, and a position tracker 24.

The repeater 21 refers to a repeater located in an area in which a lost generation detector 10 transmitting and receiving a signal at a short distance is located, that is, in a wide area G receiving the lost occurrence signal L2. The repeater 21 has a function of receiving the lost signal L2 and transmitting it to the central controller 22. Here, as shown in FIG. 2, the central control unit 22 receives the lost signal L2 and moves the tracking signal transmitter 23 and the position tracking unit 24 to be described later in the wide area G. FIG. Refers to a control center that commands the

The tracking signal transmitter 23 moves into the wide area G and transmits a predetermined tracking signal L3. In this embodiment, the tracking signal transmitter 23 transmits the tracking signal to an omnidirectional antenna (not shown) at a plurality of points, as shown in FIG. 5. In this way, the tracking signal L3 transmitted through the tracking signal transmitter 23 activates the position transmitter 11 so that the notification signal L4 is transmitted from the position transmitter 11. Here, the notification signal L4 is distinguished from the above-described position signal L1 for convenience of description, but this is a position signal transmitted from the same position transmitter 11.

The position tracking unit 24 receives the notification signal L4 through the directional antenna, thereby creating a received signal strength panorama with respect to the reception azimuth, and tracking the location of the lost point, that is, the position transmitter 11. As shown in FIGS. 3 and 5, the location tracking unit 24 may include a map display unit 30 so that a rescuer can visually identify the size of the notification signal L4. The map display unit 30 includes map data for showing the wide area G at a glance and a display for expressing it as an image.

For reference, the tracking signal transmitter 23 and the position tracking unit 24 as described above may be mounted on the rescue team 25 having mobility, such as a police car, as shown in FIG. 2. Therefore, the rescue team 25 can transmit and receive the tracking signal L3 at a plurality of points while moving in the wide area G. Here, the rescue team 25 refers to both manpower and equipment introduced into the wide area G identified by the central control unit 22.

The operations of the tracking signal transmitter 23 and the position tracker 24 will be described in more detail with reference to FIGS. 3 to 6.

In the case of the tracking signal transmitter 23, the position transmitter 11 is activated by transmitting the omnidirectional tracking signal L3 at the first point P1 in the wide area G as shown in FIG. Then, the position transmitter 11 located at the target position T, which is the position of the lost child C, receives the tracking signal L3 and transmits a notification signal L4 indicating its current position.

For reference, the notification signal L4 may be directly transmitted to the position tracking unit 24 mounted on the rescue team 25 together with the tracking signal transmitter 23, and the location tracking after the radio wave is reflected in the building. May be sent to the unit 24. Therefore, the notification signal L3 has a different intensity according to the angle of reception, as shown in the reception panorama shown in FIG. 4, and the candidate areas A1, A2, and A3 shown in FIG. 3 that are greater than or equal to a preset reference value. Is set to). The candidate areas A1, A2, and A3 are displayed on the map display unit 30 as having different radii with the first point P1 as a vertex. Among the candidate areas A1, A2, and A3, the area having the largest signal strength, that is, the direction of the first area A1, is the direction in which the notification signal L4 is directly transmitted from the position transmitter 11. It is closest to the tracking area (F) that includes the target position (T).

For reference, in the present exemplary embodiment, the candidate regions A1, A2, and A3 are three, as shown in FIGS. 3 and 4, but the candidate regions A1, A2, and A3 are not shown. Since the number corresponds to the number of signal sizes equal to or greater than the reference value, the number is not limited by the drawings.

Meanwhile, in order to accurately track the target position T at which the notification signal L4 is transmitted, as shown in FIGS. 5 and 6, the tracking signal transmitter 23 is provided a plurality of times in the wide area G. Transmits the tracking signal L3. That is, the rescue team 25 equipped with the tracking signal transmitter 23 moves out of the first point P1 to the second and third points P2 and P3, which are new positions, to respectively track the signal L3. After the transmission, the notification signals L42 and L43 are respectively transmitted from the position transmitter 11. In this case, the new position (P1) (P2) is located in the direction of the relatively large signal strength of the candidate areas (A1) (A2) (A3) detected at the first position (P1), the target position (T) It is good to secure the proximity of the furnace.

Based on the notification signals L41, L42, and L43 transmitted at these different points P1, P2, and P3, a plurality of candidate areas A1 and A2 (on the map display unit 30) ( A3) (B1) (B2) (B3) (C1) (C2) is displayed. Based on this, the position tracking unit 24 determines that the signal strength among the candidate areas A1, A2, A3, B1, B2, B3, C1, and C2 is relatively large. An area smaller than the set reference area is traced to the tracking area F. FIG.

The lost tracking method of the location tracking system 1 according to the present invention having the above configuration will be described with reference to FIGS. 1 to 7.

First, referring to the flowchart shown in FIG. 7, the lost tracking method according to an embodiment of the present invention may include a lost signal generation step S10, a tracking signal generation step S20, a notification signal activation step S30, and a candidate. It is composed of an area setting step (S40) and a tracking step (S50).

In the lost signal generation step (S10), the position signal L1 is received at a short distance and compared with a threshold, thereby generating a lost signal L2. At this time, the position signal L1 is generated from the position transmitter 11 carried by the lost child C, as shown in FIGS. 1 and 2. In addition, the position signal (L1) is received by the position receiving unit 12 mounted on the portable goods carried by the guardian, when the received value is smaller than the threshold value, the position receiving unit 12 is the lost (C) and the guardian It is determined that the distance between them is outside the reference distance to generate the lost signal (L2).

The tracking signal generation step S20 is followed by the step S15 in which the rescue team 25 equipped with the tracking signal transmitter 23 moves to the wide area G where the generated child generation signal L2 is generated. It is generated from the tracking signal transmitter 23. In this case, the wide area G corresponds to the wide area of the repeater 21 which receives the lost signal L2 and transmits it to the central controller 22. Also, the tracking signal L3 is an omnidirectional signal transmitted from an omnidirectional antenna (not shown).

The notification signal activation step (S30) is a step in which the position transmitter 11 is activated by the tracking signal (L3) to generate a notification signal (L4). The notification signal L4 thus activated is received by the position tracking unit 24, thereby creating a notification signal reception panorama (S35). At this time, the position tracking section 24 is also mounted on the rescue table 25, thereby having mobility.

The reception panorama preparation step S35 is created by the position tracking unit 24 having a directional antenna (not shown) transmitting the transmitted notification signal L4. The reception panorama thus prepared is a panorama representing the reception signal strength (intensity) relative to the reception azimuth as shown in FIG. 4.

In the candidate region setting step (S40), a region in which the size of the received notification signal L4 is larger than a preset reference value as shown in FIG. 5 is set as candidate regions A1, A2, and A3. In this case, as shown in FIG. 4, the candidate areas A1, A2, and A3 are displayed on the map display unit 30, which can visually check the magnitude of the received notification signal L4, thereby providing convenience to the rescuer. Promote.

In the comparing step S50, the tracking area F including the target position T is tracked by comparing the size of the set candidate areas A1, A2, and A3 with the reference area. To this end, the comparing step (S50), if the size of the set candidate area (A1) (A2) (A3) is larger than the size of the predetermined reference area, by moving the rescue team 25 to a new position to reduce the error The new tracking signal L3 is transmitted. Therefore, the tracking signal generation step (S20), the notification signal activation step (S30), the candidate area setting step (S40) and the comparison step (S50) has the size of the set candidate area as shown in Figs. The process is repeated until it is smaller than the size of the preset reference area. In this case, the new measurement position (P2) (P3) is set to the candidate in the direction that the magnitude of the notification signal (L4) measured at the first position (P1) previously measured.

Finally, candidate regions B1, B2, B3, C1 and C2 measured and set at the new position, that is, the second and third positions P2 and P3, as shown in FIGS. 5 and 6. Of the candidate areas A1, A2, and A3, which are previously measured at the measured position, that is, the first position P1, are overlapped in a specific direction, so that the area smaller than the size of the preset reference area is immediately tracked. It is to be the tracking area (F). Then, the rescue team 25 recognizes that there is a target position T at which the lost child C to be rescued is located in the tracking area F, and moves to the tracking area F, so that the rescue area 25 is quickly moved. Mia can be rescued.

As described above, while having been described with reference to the preferred embodiment of the present invention, those skilled in the art various modifications and changes within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

1 is a block diagram for explaining a mia tracking system according to an embodiment of the present invention;

FIG. 2 is a schematic view for explaining an example of the mia tracking system shown in FIG. 1;

3 is a map display unit for explaining a reception size of a notification signal in a first position;

4 is a panorama illustrating signal strength with respect to a reception azimuth of the notification signal of FIG. 3;

5 is a map display unit for explaining a notification signal receiving size in first to third positions;

6 is a notification signal panorama from first to third positions; And,

7 is a flowchart illustrating a lost tracking method according to an embodiment of the present invention.

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

1: Position Tracking System 10: Loss Detection Detector

20: active position tracker

Claims (13)

Mia generation detector for detecting the occurrence of the missing by the magnitude of the position signal transmitted and received at a short distance to generate a lost signal; And An active position tracker which tracks a lost point in the magnitude and direction of a received signal by transmitting and receiving a signal with the lost point detection sensor in a wide area where the lost point signal is generated; Location tracking system comprising a. The method of claim 1, The missing occurrence detector, A position transmitter which periodically generates a predetermined position signal; And A position receiver which receives the position signal transmitted from the position transmitter and generates the lost signal when the magnitude of the position signal is less than a preset threshold; Location tracking system comprising a. The method of claim 2, The active position tracker, A repeater located within the wide area receiving the lost signal; A tracking signal transmitter for transmitting a tracking signal for activating a notification signal from the location transmitter in the wide area; And A location tracking unit tracking the missing point by receiving the tracking signal and comparing it with a size of a preset reference area; Location tracking system comprising a. The method of claim 3, The tracking signal transmitter transmits the tracking signal to the omnidirectional antenna at a plurality of points, The location tracking unit receives a notification signal of the location transmitter activated by the tracking signal at the plurality of points with a directional antenna, and creates a received signal strength panorama relative to a reception azimuth to track the occurrence of the missing point. Location tracking system. The method of claim 3, And a central control unit for receiving the lost signal through the repeater and moving the tracking signal transmitter and the tracking unit to the wide area. Generating a lost signal by receiving a position signal generated from the lost child in the short range and comparing the position signal with a preset threshold; Generating a tracking signal in a wide area where the lost signal is generated; Activating a notification signal for the tracking signal; Setting a candidate area larger than a preset reference value by receiving the notification signal; And Tracking the location of the missing child by comparing the size of the candidate area with a range of a preset reference area; Mia tracking method comprising a. The method of claim 6, The lost signal generation step, Mia tracking method, characterized in that the position signal transmission and reception between the position transmission unit mounted on the portable device carried by Mia and the position transmitter mounted on the portable device of the protector. The method of claim 7, wherein Mia tracking method, characterized in that between the step of generating the lost signal generating step and the tracking signal generating step, the active position tracker is moved to a wide area of the repeater receiving the missing signal. The method of claim 8, The notification signal activation step, Mia tracking method characterized in that the notification signal activated by the tracking signal is generated by the position transmitter. The method of claim 6, The tracking signal is generated by an omnidirectional antenna, The notification signal is received by the directional antenna, characterized in that the lost tracking method. The method according to any one of claims 6 to 10, MIA tracking method is provided between the notification signal activation step and the candidate region detection step to receive the generated notification signal to create a reception panorama. The method of claim 7, wherein The comparing step, If the range of the candidate region is larger than the size of the reference region, the candidate region is moved to a new position at the current position and is repeated from the tracking signal generation step. If the range of the candidate area is smaller than the size of the reference area, the missing tracking method, characterized in that the location is determined that there is a missing point in the candidate area. The method of claim 12, The new location is lost tracking method characterized in that the direction of the received notification signal is relatively large.

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