KR101935145B1 - Drop detection apparatus and system - Google Patents

Abstract

The present invention relates to a drop detection apparatus and system, and more particularly, to a drop detection apparatus and a drop detection apparatus which are provided with a first sensing section for sensing a drop preparation state of a drop target, a second sensing section for sensing a drop state of the drop target, And a control unit for receiving the sensing signal from the first and second sensing units and controlling the position tracking unit.

Description

[0001] DROP DETECTION APPARATUS AND SYSTEM [0002]

The present invention relates to a drop detection apparatus and system.

The suicide rate of the Republic of Korea is the highest among the OECD countries and is one of the highest suicide rates in the world. In the late 2000s, suicide rates continued to increase, with an average of 37 suicides per day. In 2015, the number of suicide deaths is 15,353 out of 275,895, a 15% increase compared to 10 years ago.

In addition, about 1,500 people have attempted to invest in the Han River for the past five years, and the number of cases of investing in bridges has increased in spite of the impulsive and unstable psychological state and living standards. Conventionally, several CCTVs are installed along the extended longitudinal direction of the bridge to prevent the transmission of such a bridge, and the manager monitors the images photographed by the people located on the bridge and identifies safety incidents A management system in which measures are taken by a rescue team or a staff member of the system is used.

However, there is a possibility that the safety accident detection is missed because the manager monitors the images taken from several CCTVs and confirms the movement of the people located in the entire bridge, so that it is not easy to identify the safety accident. The number of the bridges The CCTV installed increases as the length of each bridge is increased. As a result, video information to be monitored is increased, and the labor cost of the monitoring and monitoring personnel is excessively increased.

An embodiment of the present invention aims to accurately detect a falling object falling below a bridge and quickly search for and reconstruct the falling object.

A drop detection apparatus according to an embodiment of the present invention includes a first sensing unit for sensing a drop preparation state of a drop target, a second sensing unit for sensing a drop state of the drop target, A position tracking unit for tracking a position of the drop target after dropping; And a controller receiving the sensing signal from the first and second sensing units and controlling the position tracking unit.

The first sensing unit may sense that the drop target is located at the drop start point.

The first sensing unit may include a pressure sensor installed at a rail of a leg to sense a pressure of the object to be dropped when the object falls.

The second sensing unit may sense that the falling object begins to fall and passes through a point on the falling path.

The second sensing unit may include an infrared sensor installed to monitor at least one point located vertically downward from the rail of the bridge by infrared rays to sense that the object to be dropped passes through the point.

The position-tracking unit may drop when the dropping state of the dropping object is sensed and provide position information by wireless communication.

Wherein the position-tracking unit comprises: a buoy which is installed on the leg and separates from the mounting point when the falling state of the falling object is sensed, A position information calculator for calculating position information of the buoy provided to the buoy; And a wireless transmitter for transmitting a signal including the position information.

The control unit may determine that the drop target is in a drop preparation state when the pressure sensed by the pressure sensor exceeds a predetermined reference pressure and continues for a predetermined reference time.

Wherein the control unit determines that the drop target is detected by the infrared sensor within a predetermined threshold time after the pressure sensed by the pressure sensor is decreased beyond a predetermined threshold pressure difference after the drop target is determined to be in a drop preparation state If a passage past the point is detected, it can be determined that the drop target is in the drop state.

Wherein the drop detection device further includes a communication unit for communicating with the control server via a network, and wherein when the control unit determines that the drop target is in a drop preparation state or is determined to be in a drop state, It can be notified that it is in the corresponding state.

The control unit may be configured to separate the position tracking unit so that the position tracking unit falls after a predetermined delay time elapses after it is determined that the falling object is in the falling state.

At least one of the location information calculator and the wireless transmitter may be configured to operate once the buoy is detached at the installation point.

Wherein the pressure sensor is installed at a first predetermined interval along a rail of a leg and the infrared sensor is installed at a predetermined second interval along a body supported by a column at a leg, Wherein each of the plurality of buoys provided on the legs is operable to match one or more of the plurality of pressure sensors provided on the legs and one or more of the plurality of infrared sensors mounted on the legs.

Wherein when the drop target is determined to be in a fall ready state by a part of the plurality of pressure sensors and the drop target is determined to be dropped by the infrared sensor matched with the corresponding pressure sensor, The buoy can be separated.

A drop detection system according to an embodiment of the present invention includes: a drop detection device for detecting drop of a drop target; And a control server which receives a drop of the drop target from the drop detection device, wherein the drop detection device includes: a first sensing unit for sensing a drop preparation state of the drop target; A second sensing unit for sensing a falling state of the drop target; A position tracking unit for tracking a position of the drop target after dropping; A control unit receiving the sensing signal from the first and second sensing units and controlling the position tracking unit; And a communication unit for communicating with the control server through a network.

According to the embodiment of the present invention, when a falling object falls below a bridge, it can be accurately detected, and a falling object can be quickly searched and rescued.

1 is an exemplary diagram illustrating a block diagram illustrating a configuration of a drop detection system according to an embodiment of the present invention.
FIG. 2 is an exemplary view showing a state in which a drop detection device according to an embodiment of the present invention is disposed on a bridge. FIG.
3 is a block diagram illustrating a detailed configuration of the position tracking unit according to an embodiment of the present invention.
4 is a flowchart showing a flow for determining that a falling object is in a drop preparation state according to an embodiment of the present invention.
5 is a flowchart showing a flow of determining a falling object in a falling state according to an embodiment of the present invention.
FIG. 6 is an exemplary diagram showing a drop preparation state of a drop target in a drop detection apparatus according to an embodiment of the present invention. FIG.
FIG. 7 is an exemplary diagram illustrating a falling state of a drop target in the drop detection apparatus according to an embodiment of the present invention. FIG.
FIG. 8 is an exemplary diagram showing a state in which a predetermined delay time has elapsed after it has been determined that the object to be dropped is in a falling state according to an embodiment of the present invention.

Other advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Unless defined otherwise, all terms (including technical or scientific terms) used herein have the same meaning as commonly accepted by the generic art in the prior art to which this invention belongs. Terms defined by generic dictionaries may be interpreted to have the same meaning as in the related art and / or in the text of this application, and may be conceptualized or overly formalized, even if not expressly defined herein I will not.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms' comprise 'and / or various forms of use of the verb include, for example,' including, '' including, '' including, '' including, Steps, operations, and / or elements do not preclude the presence or addition of one or more other compositions, components, components, steps, operations, and / or components. The term 'and / or' as used herein refers to each of the listed configurations or various combinations thereof.

It should be noted that the terms such as '~', '~ period', '~ block', 'module', etc. used in the entire specification may mean a unit for processing at least one function or operation. For example, a hardware component, such as a software, FPGA, or ASIC. However, '~ part', '~ period', '~ block', '~ module' are not meant to be limited to software or hardware. Modules may be configured to be addressable storage media and may be configured to play one or more processors. ≪ RTI ID = 0.0 >

Thus, by way of example, the terms 'to', 'to', 'to block', 'to module' refer to components such as software components, object oriented software components, class components and task components Microcode, circuitry, data, databases, data structures, tables, arrays, and the like, as well as components, Variables. The functions provided in the components and in the sections ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ' , '~', '~', '~', '~', And '~' modules with additional components.

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

FIG. 1 is a block diagram illustrating a configuration of a drop detection system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a drop detection apparatus according to an exemplary embodiment of the present invention, .

Referring to FIG. 1, the drop detection apparatus 10 may include a first sensing unit 100, a second sensing unit 200, a position tracking unit 300, a controller 400, and a communication unit 500 . The first sensing unit 100, the second sensing unit 200, the position tracking unit 300, and the communication unit 500 are connected to the controller 400. The control unit 400 may be connected to the control server 600 through the communication unit 500 via a network.

In other words, the drop detection device 10 is a device for quickly detecting people falling on a bridge by using various sensors to detect fall of the bridge.

Referring to FIG. 2, it can be seen that the drop detection device 10 is arranged on a bridge.

The first sensing unit 100 may sense a drop preparation state of the drop target. Here, the falling preparation state refers to a case where the object to be dropped is placed on the rail of the bridge on the rail.

According to an embodiment of the present invention, the first sensing unit 100 can detect that the object to be dropped is positioned at the falling start point, and when the object to be dropped is located on a rail, And a pressure sensor for sensing pressure by the pressure sensor.

In addition, the first sensing unit 100 is arranged long in the railing of the leg extending in the longitudinal direction of the leg. The first sensing unit 100 may be disposed at predetermined intervals in the longitudinal direction of the legs to sense the pressure of the falling object falling in the corresponding interval.

Since the first sensing units 100 are arranged at predetermined intervals, the normal legs have a considerable length. Therefore, if the first sensing units 100 are arranged longer than the first sensing units 100, It will be difficult to know at which position the pressure is sensed when the pressure sensor that senses the pressure senses the pressure of the object to be dropped. Therefore, the first sensing unit 100 may be spaced apart.

In addition, the first sensing unit 100 may include a pressure sensing sensor. For example, a pressure sensor that senses weight can detect a falling object climbing on a leg rail. However, the sensor used in the first sensing unit 100 is not limited to a pressure sensor, but may be any sensor capable of detecting a drop target by raising it on a rail of a leg.

For example, a falling object will climb above the rail of a bridge to fall. Fallen objects that fall on the bridge can fall immediately, but for most falling objects, they stay for a few seconds to a few minutes and then decide to fall. Therefore, the first sensing unit 100 can be installed on the railing of the legs to primarily detect the movement of the falling object.

The second sensing unit 200 can sense the falling state of the drop target. Here, the falling state refers to falling objects falling on the legs of the legs falling below the legs.

According to an embodiment of the present invention, the second sensing unit 200 can sense that the object to be dropped starts to fall and passes through a point on the dropping path. This means that a drop target is detected in a radius detected by the second sensing unit 200 disposed at regular intervals on the side of the legs.

In addition, the second sensing unit 200 may include an infrared sensor, which is located vertically downward from the rail of the bridge and is installed to monitor at least one point with infrared rays, and detects that the object to be dropped passes through the point . An example is an infrared sensor capable of detecting a human body, and can determine whether or not a falling object is human or not. However, the sensor used in the second sensing unit 200 is not limited to the infrared sensor, and any sensor can be used as long as it is capable of sensing whether the object is a person or not.

In addition, the second sensing unit 200 is normally in the power saving mode, and can be switched to the active mode state when the control unit 400 determines that the drop target is in the fall ready state. Specifically, if there is no determination as to whether the falling object is ready to be dropped from the controller 400, the second sensing unit 200 consumes only a minimum amount of electric power in the standby mode, The second sensing unit 200 can be switched to the active mode.

The position tracking unit 300 can track the position of the drop target after dropping. The position-tracking unit 300 may be detached from the leg when the second sensing unit 200 senses a falling state of the object to be dropped.

According to an embodiment of the present invention, when the dropping state of the dropping object is detected, the location tracking unit 300 may drop and provide position information by wireless communication. The position tracking unit 300 is disposed at a predetermined interval between the second sensing units 200 at the lower ends of the second sensing units 200 arranged at regular intervals in the longitudinal direction on the outer surface of the bridge. When the second sensing unit 200 senses a fall, the position-tracking unit 300 may drop down the bridge. The position tracking unit 300 may have a property that the water flows smoothly.

The control unit 400 is a processing unit that processes collected information, and may include various processors such as a CPU, a GPU, and an AP. According to an embodiment of the present invention, the control unit 400 may receive a sensing signal from the first sensing unit 100 and may sense the sensing signal received from the first sensing unit 100, And can receive the sensing signal from the second sensing unit 200 and send the sensing signal received from the second sensing unit 200 to the position tracking unit 300.

The communication unit 500 may communicate with the drop detection apparatus 10 and the control server 600 through a network.

For example, the network refers to wireless Internet technologies such as WLAN (Wireless LAN, Wi-Fi), Wibro (Wireless broadband), HSDPA (High Speed Downlink Packet Access), GSM, CDMA, WCDMA, LTE . However, the network is not limited to the wireless Internet technology described above, but can also be a wired Internet technology.

According to an embodiment of the present invention, when the control unit 400 determines that the drop target is in the fall ready state or is in the drop state, the communication unit 500 transmits the drop target to the control server 600 It can be notified that it is in the corresponding state.

The control server 600 can provide information in real time to the terminal of the rescue agent arriving at the site and necessary for tracking the interpreter received from the location tracking unit 300. Here, the terminal of the rescue personnel is a computing device possessed by an emergency rescuer, for example, a mobile device (smart phone, tablet PC, etc.). However, it is not limited thereto. Through this, it is possible to promptly search for the investor in the case of investor, and to discover the investor quickly and be able to revive.

3 is a block diagram illustrating a detailed configuration of the position tracking unit 300 according to an embodiment of the present invention.

Referring to FIG. 3, the position-tracking unit 300 may be installed in a leg so that when the falling object falls, it may be separated from an installation point and fall down. A position information calculator 310 for calculating position information, and a wireless transmitter 320 for transmitting signals including the position information.

In addition, the location information calculator 310 of the location tracking unit 300 can calculate the location information of the buoy and send the location information of the buoy to the control server 600 based on the information.

Further, the wireless transmitter 320 of the location tracking unit 300 may wirelessly communicate with the control server 600 through the wireless unit. The location information of the buoy calculated by the location information calculator 310 can be sent to the control server 600 in real time.

FIG. 4 is a flowchart showing a flow of determining a fall target in a fall ready state according to an embodiment of the present invention, and FIG. 6 is a flowchart illustrating a flow of a drop target for drop in a drop target detection apparatus according to an embodiment of the present invention Fig.

Referring to FIGS. 4 and 6, when the pressure sensed by the pressure sensor exceeds a preset reference pressure and continues for a predetermined reference time, the controller 400 can determine that the drop target is in a drop preparation state have.

In other words, when the pressure sensed by the first sensing unit 100 exceeds a preset reference pressure and the duration of the pressure sensed by the first sensing unit 100 is maintained longer than a preset reference time, Can be determined to be in the drop preparation state.

For example, when the preset reference pressure is 30 in the controller 400 and the preset reference time is 10 seconds, the pressure sensed by the first sensing unit 100 is 80 and the pressure sensed by the first sensing unit 100 is 80, If the duration of the pressure sensed by the pressure sensor is 2 seconds, the predetermined reference pressure is exceeded, but it does not exceed the preset reference time, and the valve is not ready to fall.

In addition, when the preset reference pressure is 30 in the controller 400 and the predetermined reference time is 10 seconds, the pressure sensed by the first sensing unit 100 is 80 and the pressure sensed by the first sensing unit 100 is 80 If the duration of one pressure is 20 seconds, the valve is ready to fall beyond a preset reference pressure and a predetermined reference time.

Here, the reason for restricting the reference pressure is that in the actual environment, the bridge railing may rise to the bridge railing, but when a bird (gull, pigeon, etc.) rests on the bridge railing for a while, As shown in FIG. The reason for setting the reference time is that the actual dropping objects fall on the railing of the bridge and do not fall immediately, but stay for a certain time and fall down.

FIG. 5 is a flowchart showing a flow of determining a falling object in a falling state according to an embodiment of the present invention, and FIG. 7 is a diagram illustrating an example of a falling state of a falling object in the drop detection apparatus according to an embodiment of the present invention. .

Referring to FIGS. 5 and 7, after the control unit 400 determines that the falling object is in the drop preparation state, the pressure sensed by the pressure sensor is decreased beyond a predetermined threshold pressure difference, It can be determined that the object to be dropped is in the falling state when the object is detected to pass through the point by the infrared sensor.

In other words, when the drop target is determined to be in the fall ready state, the difference in the pressure sensed by the pressure sensor is reduced beyond the reference threshold pressure difference, and when the drop target is detected by the infrared sensor within the reference threshold time, Can be determined to be in the falling state.

For example, when the predetermined threshold pressure difference is 50 and the predetermined threshold time is 5 seconds, if the pressure sensed by the pressure sensor in which the dropping object in the drop preparation state stays 80 is instantaneously decreased to 10, 70. In this case, the critical pressure difference is exceeded. If it is detected by the infrared sensor within a predetermined threshold time of 5 seconds, it is determined that the falling object is in the falling state. If the infrared sensor detects the falling time exceeding the predetermined threshold time, the falling object is not determined to be in the falling state .

Here, the reason why the difference in the pressure sensed by the pressure sensor exceeds the reference threshold pressure but is not determined as a fall state is that the drop falls on the rail of the bridge and falls down safely.

In addition, the drop target is determined to be in a drop ready state and the difference in the pressure sensor is considered because a malfunction may occur if the drop target, which is in the ready to fall state, is forwardly advanced by a flying object such as a bird (pigeon, duck, etc.).

According to an embodiment of the present invention, the drop detection apparatus 10 includes a communication unit 500 that communicates with a control server through a network, and the communication unit 500 controls the drop unit If it is determined to be in the falling ready state or is determined to be in the falling state, the control server 600 can notify that the falling object is in the corresponding state.

For example, when the control unit 400 determines that the drop target is in the fall ready state or fall state in the above-described procedure, the communication unit 500 determines that the drop target is in the fall ready state or the fall state To the control server (600).

In addition, if there is an associated institution (119 rescue units, marine police, fire station, etc.) previously stored in the control unit 400, it is possible to notify that the falling object is in the fall ready state or fall state.

FIG. 8 is an exemplary diagram showing a state in which a predetermined delay time has elapsed after it has been determined that the object to be dropped is in a falling state according to an embodiment of the present invention.

Referring to FIG. 8, after the controller 400 determines that the drop target is in the drop state, the position detector 300 may drop the drop after the predetermined delay time has elapsed.

Here, it is determined that the falling object is in the falling state and the falling of the position-tracking unit 300 after a predetermined delay time has elapsed so that the object to be dropped and the position-tracking unit 300 are not interfered with each other And drops the position-tracking unit 300 after a predetermined delay time has elapsed.

According to one embodiment of the present invention, at least one of the location information calculator 310 and the wireless transmitter 320 may be configured to operate when the buoy is detached at the installation point. The position information calculator 310 and the wireless transmitter 320 included in the position tracking unit 300 are normally in the standby mode and when the position tracking unit 300 is separated from the mounting point, And can be operated.

According to an embodiment of the present invention, the pressure sensors are installed at predetermined first intervals along the railing of the legs, and the infrared sensors are installed at predetermined intervals along the body supported by the pillars at the legs, The buoy may be installed at predetermined third intervals along the body of the leg.

A first interval indicating the interval of the pressure sensors included in the first sensing unit 100, a second interval indicating the interval between the infrared sensors included in the second sensing unit 200, The first interval is wider than the second interval, and the second interval is wider than the third interval.

According to one embodiment of the present invention, each of the plurality of buoys mounted on the legs can be operated by matching one or more of the plurality of pressure sensors provided on the legs and one or more of the infrared sensors installed on the legs.

In other words, the position tracking unit 300 is matched with one or more of the first sensing units 100 installed on the parapet of the leg, and the position tracking unit 300 includes a second sensing unit 200 installed on the leg, ≪ / RTI > and / or < / RTI >

According to an embodiment of the present invention, when the falling object is determined to be in a falling state by a part of the plurality of pressure sensors, and the falling object is determined to be dropped by the infrared sensor matched with the corresponding pressure sensor , The pressure sensor and the infrared sensor can be matched to each other.

For example, when the object to be dropped falls on the legs of the leg, it is detected by a part of the plurality of first sensing units 100. Thereafter, the drop target is determined to be in a falling ready state, and the drop target is determined to be dropped by the second sensing unit 200 matched with the first sensing unit 100, And the position tracking unit 300 matched with the second sensing unit 200 can be separated from the leg.

At least one position-tracking unit 300 may be disposed at a predetermined interval between the second sensing units 200. In addition, if the controller 400 determines that the controller 400 is in the falling state, at least one or more position tracking units 300 adjacent to the second sensing unit 200 may be separated from the legs.

According to an embodiment of the present invention, the drop detection system includes a drop detection device (10) for detecting dropping of a dropping object and a control server (600) for receiving a drop of the dropping object from the drop detection device, The detection device 10 includes a first sensing portion 100 for sensing a drop preparation state of a drop target, a second sensing portion 200 for sensing a drop state of the drop target, A controller 400 for receiving a sensing signal from the first and second sensing units 100 and 200 and controlling the position tracking unit 300 and a control unit 400 for controlling the position of the control server 600 (Not shown).

While the present invention has been described with reference to the exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Those skilled in the art will appreciate that various modifications may be made to the embodiments described above. The scope of the present invention is defined only by the interpretation of the appended claims.

10: Drop detection device
100:
200: second sensing unit
300:
310: Location information calculator
320: Wireless transmitter
400:
500:
600: control server

Claims (15)

A first sensing unit for sensing a drop preparation state of a drop target;
A second sensing unit for sensing a falling state of the drop target;
A position tracking unit for tracking a position of the drop target after dropping; And
And a control unit for receiving the sensing signal from the first and second sensing units and controlling the position tracking unit,
Wherein the position tracing unit further comprises a buoy that is installed on the leg and separates from the installation point when the dropping state of the dropping object is detected. The method according to claim 1,
Wherein the first sensing unit senses that the drop target is located at a drop start point. The method of claim 2,
Wherein the first sensing unit includes a pressure sensor installed at a rail of a leg to sense a pressure of a falling object when the falling object is located at a rail. The method of claim 3,
Wherein the second sensing unit senses that the falling object starts to fall and passes through a point on the falling path. The method of claim 4,
Wherein the second sensing unit is installed to monitor at least one point located vertically downward from the rail of the bridge by infrared rays to detect that the falling object passes through the point. The method of claim 5,
Wherein the position-tracking unit drops when the falling state of the drop target is detected and provides position information by wireless communication. The method of claim 6,
The position-
A position information calculator for calculating position information of the buoy provided to the buoy; And
And a wireless transmitter for transmitting a signal including the position information to the buzzer. The method of claim 5,
The control unit includes:
When the pressure sensed by the pressure sensor exceeds a predetermined reference pressure and continues for a predetermined reference time, determines that the dropped object is in the drop ready state. The method of claim 8,
The control unit includes:
The drop target is passed by the infrared sensor within a predetermined threshold time after the pressure sensed by the pressure sensor is reduced beyond a predetermined threshold pressure difference after it is determined that the drop target is in a drop preparation state The drop determination device determines that the drop target is in the drop state. The method of claim 9,
The drop detection apparatus further includes a communication unit for communicating with the control server through a network,
Wherein the communication unit notifies the control server that the drop target is in the corresponding state when it is determined by the control unit that the drop target is in the fall ready state or is determined to be in the drop state. The method of claim 7,
The control unit includes:
Wherein the position tracing unit is configured to fall off after the predetermined delay time has elapsed after it is determined that the falling object is in the falling state. The method of claim 11,
Wherein at least one of the location information calculator and the wireless transmitter is configured to operate once a buoy is detached at an installation point. The method of claim 7,
Wherein the pressure sensor is installed at a predetermined first interval along a rail of a leg,
Wherein the infrared sensor is installed at a predetermined second interval along a body supported by a column at a leg,
Wherein the legs are provided at predetermined third intervals along the leg body,
Each of the plurality of buoys mounted on the leg being operated by matching one or more of the plurality of pressure sensors mounted on the legs and one or more of the plurality of infrared sensors mounted on the legs. 14. The method of claim 13,
The control unit includes:
After the falling object is determined to be in a drop preparation state by a part of the plurality of pressure sensors, when the falling object is determined to be in a falling state by the infrared sensor matched with the pressure sensor, the pressure sensor and the infrared sensor are matched with each other Drop detection device. A drop detection device for detecting a drop of the drop target; And
And a control server which receives a drop of the drop target from the drop detection device, the drop detection device comprising:
A first sensing unit for sensing a drop preparation state of a drop target;
A second sensing unit for sensing a falling state of the drop target;
A position tracking unit for tracking a position of the drop target after dropping;
A control unit receiving the sensing signal from the first and second sensing units and controlling the position tracking unit; And
And a communication unit for communicating with the control server through a network,
Wherein the position tracing unit further comprises a buoy provided on the leg and separated from the installation point when the falling state of the falling object is sensed.

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