Unattended area monitoring system and monitoring method thereof

Abstract

The invention provides an unattended area monitoring system and a monitoring method thereof. According to the invention, through the information acquisition devices installed around the unattended area, real-time images, the intensity of sound signals, the intensity of infrared signals and grating signals are acquired, and the acquired data are sent to the position analysis module, the infrared analysis module and the controller for processing the data. The controller judges the alarm type and the alarm position according to the change of the acquired numerical value, monitors the alarm position through the camera, and remotely sends the judgment result to the monitoring server through the network sending module and the network receiving module for long-distance data transmission; the network receiving and sending module is more convenient for remote transmission in an unmanned area, the power supply system ensures the stable operation of the system, and a worker monitors the unmanned area in real time through the monitoring device and can perform key monitoring on the position where an alarm is sent.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring systems, and particularly to an unattended area monitoring system and a monitoring method thereof. Background Art

[0002] Due to the continuous existence of people's needs for the security and protection of personal property, commercial facilities, public buildings, and critical infrastructure, monitoring systems have become more important. With the rapid development of computer technology, network communication, and storage technology, monitoring systems have been popularized. However, existing monitoring systems still require on-site personnel to be on duty.

[0003] In the prior art, an unattended area monitoring device and system with a publication number of CN217693525U includes a service module, a communication module, an energy supply module, a total control module, and a bearing module; the service module executes corresponding service functions based on the first control instruction of the total control module; the communication module executes data communication based on the second control instruction of the total control module; the bearing module is used for an installation frame that bears the service module, the communication module, and the energy supply module; the energy supply module is used for energy storage based on the third control instruction of the total control module. The area monitoring device of this application adopts a modular design, and the modules can be customized according to specific service requirements to realize the collection, transmission back, and wireless communication of data such as video and sensors in the monitoring area. However, the system has a simple structure, and the collected signals are single, only for video monitoring, and cannot perform danger warnings. Summary of the Invention

[0004] The purpose of the present invention is to provide an unattended area monitoring system and a monitoring method thereof to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An unattended area monitoring system, comprising:

[0007] An information collection device, at least four groups of which are provided and installed around the unattended area to collect real-time video data, sound signal intensity data, infrared signal intensity magnitude, and grating real-time signals in the area;

[0008] A position analysis module, electrically connected to the information collection device, used for receiving the sound signal intensity data collected by the information collection device, analyzing and judging whether the sound intensity is abnormal, and judging the position coordinates of the hazard source according to the time difference of the sound signals collected by each information collection device, and sending them to the controller;

[0009] An infrared analysis module, which is electrically connected to the information collection device, is used to receive the intensity of the infrared signal collected by the information collection device to determine whether there is an abnormality, and when there is an abnormality, generate a danger index based on the infrared signal intensity data collected by each information collection device, the temperature, and the size of the temperature area to judge what kind of alarm it is, and send it to the controller;

[0010] A controller, which is electrically connected to the information collection device, the position analysis module, and the infrared analysis module, is used to receive the real-time grating signal and real-time picture data collected by the information collection device, judge the intrusion direction according to the position where the real-time grating signal is interrupted, and control the camera to rotate to the alarm position in the dangerous area to monitor the real-time picture of the area according to the alarm type;

[0011] A power supply system, which is electrically connected to the controller, is used to supply power to the monitoring system;

[0012] A network sending module, which is electrically connected to the controller, and the controller sends the result of the processed collected data to the network sending module;

[0013] A network receiving module, which is electrically connected to the network sending module, is used to receive the data sent from the network sending module through the network to achieve long-distance real-time data transmission;

[0014] A monitoring server, which is electrically connected to the network receiving module, is used for the monitoring server to read the remote data received by the network receiving module;

[0015] A monitoring device, which is electrically connected to the monitoring server, is used to display the data monitored by the monitoring server in real time, and conduct key monitoring according to the alarm type and alarm position.

[0016] In one embodiment, the information collection device includes a camera, an infrared grille, a sound sensor, and an infrared sensor. The camera is installed in the unattended area and is electrically connected to the controller for collecting the monitoring picture in real time. The infrared grille is installed around the unattended area and is electrically connected to the controller for detecting whether the unattended area is invaded. The sound sensors are evenly installed around the unattended area for detecting the strength signal of the sound signal in the area. The infrared sensors are evenly installed around the unattended area for detecting the intensity signal of the infrared signal in the area.

[0017] In one embodiment, 4 sound sensors are arranged in four directions around the area. The specific logic for judging whether there is an abnormality based on the intensity data of the sound signal detected by the sound sensor is:

[0018] Calculate the average intensity p of the intensity data of the sound signals collected by four sound sensors x is;

[0019]

[0020] When p x is less than the safe sound intensity threshold p, it is in a safe state. When p x is greater than the safe sound intensity threshold p, it is in an abnormal state. p1, p2, p3, and p4 are the sound intensities collected by the four sound sensors respectively.

[0021] In one embodiment, the specific logic of the position analysis module for judging the coordinates of the hazard source based on the intensity data of the sound signal is as follows:

[0022] According to the time sequence of the detected sound signals, sort the times of the sound signals detected by the 4 sound sensors, which are t1, t2, t3, and t4 respectively;

[0023] Taking the acquisition time t1 as the reference, t2 = t1 + Δt2, t3 = t1 + Δt3, t4 = t1 + Δt4;

[0024] Establish a rectangular coordinate system. According to the distance between the coordinate position of the sensor acquisition point and the coordinate position of the sound transmission point, through the sound propagation speed V 声 and time, the distance relationship equation between the coordinate of the acquisition point and the coordinate of the sound generation point can be obtained. The expression based on is:

[0025] The distance equation between the acquisition coordinate L1(x l1 y l1 ) and the coordinate of the sound generation point L(x l y l ) is;

[0026]

[0027] The distance equation between the acquisition coordinate L2(x l2 y l2 ) and the coordinate of the sound generation point L(x l y l ) is;

[0028]

[0029] The distance equation between the acquisition coordinate L3(x l3 y l3 ) and the coordinate of the sound generation point L(x l y l ) is;

[0030]

[0031] The distance equation between the acquisition coordinate L3(x l3 y l3 ) and the coordinate L(x l y l ) of the sound occurrence point is;

[0032]

[0033] wherein, L1(x l1 y l1 ), L2(x l2 y l2 ), L3(x l3 y l3 ), L4(x l4 y l4 ) are the coordinates of 4 sound sensors respectively, and L(x l y l ) represents the coordinate of the position where the detected sound occurs;

[0034] It is obtained by calculating the distances from the coordinate L(x l y l ) of the sound occurrence point to the acquisition coordinate L1(x l1 y l1 ) and the acquisition coordinate L2(x l2 y l2 );

[0035]

[0036] The calculated distance R1 of the sound to L1(x l1 y l1 ) is R1 = t1 × V 声 ;

[0037] The distance R2 of the sound to L2(x l2 y l2 ) is R2 = t2 × V 声 ;

[0038] The distance R3 of the sound to L3(x l3 y l3 ) is R3 = t3 × V 声 ;

[0039] According to the formula of the rectangular coordinate system of a circle;

[0040] (x - a) 2 +(y - b) 2 = r 2

[0041] Taking L1(x l1 y l1), L2(x l2 y l2 ), L2(x l2 y l2 ) as the center and R1, R2, and R3 as the radii to calculate the coordinates L(x l y l );

[0042]

[0043] Obtain the coordinates L(x l y l ) of the hazard source to determine its position.

[0044] In one of the embodiments, the specific logic for the infrared analysis module to generate a hazard index to determine what kind of alarm based on the infrared intensity data collected by the infrared sensor is as follows: collect;

[0045] Use 4 infrared sensors to divide the area to be detected into four areas with the same area for detection;

[0046] Calculate the hazard index θ of each area, and the formula is:

[0047] θ = ae t ln t(s + sin s)

[0048] where a is the temperature characteristic value in the area, and the infrared signal intensity detected by the infrared sensor includes the temperature t and the temperature area s;

[0049] Set the safety threshold b in the area and determine the hazard state of each area. The specific determination logic is:

[0050] When θ ≤ b, it is determined to be in a safe state;

[0051] When b < θ ≤ 5b, it is determined to be in a dangerous state;

[0052] When 5b < θ, it is determined to be in a characteristic dangerous state.

[0053] The present invention further provides an unattended area monitoring method, which is executed by the above-mentioned unattended area monitoring system and includes;

[0054] S1: Collect the real-time video data, sound signal intensity data, infrared signal intensity magnitude, and grating real-time signal around the unattended area;

[0055] S2: Determine whether there is an abnormality based on the collected sound signal intensity data, and when there is an abnormality, determine the position coordinates of the hazard source according to the collected sound signal time;

[0056] S3: Determine whether there is an abnormality based on the intensity of the collected infrared signals. When there is an abnormality, generate a danger index according to the intensity of the collected infrared signals, temperature, and temperature area size to determine the type of alarm.

[0057] S4: Determine the intrusion direction based on the position where the real-time grating signal is interrupted, and control the camera to rotate to the dangerous area to monitor the real-time picture of the area according to the alarm type and alarm position.

[0058] S5: The controller sends the processing result of the collected data to the network sending module.

[0059] S6: Send the alarm information and the real-time picture data of the area monitoring to the network receiving module through the wireless network to achieve long-distance real-time data transmission.

[0060] S7: The monitoring server reads the remote data sent from the controller received by the network receiving module.

[0061] S8: The monitoring device displays the alarm data received by the monitoring server in real time and conducts key monitoring according to the alarm type and alarm position.

[0062] Compared with the prior art, the beneficial effects of the present invention are:

[0063] The present invention collects real-time pictures, the intensity of sound signals, the intensity of infrared signals, and grating signals through information collection devices installed around the unattended area, and sends the collected data to the position analysis module, infrared analysis module, and controller for data processing. The controller judges the type of alarm and the alarm position based on the change of the collected values, and monitors the alarm occurrence position through the camera. The controller sends the judged result to the network receiving module through the network sending module to remotely transmit the data to the monitoring server for long-distance data transmission. The network receiving and sending module is more convenient for long-distance transmission in unattended areas. The power supply system ensures the stable operation of the system. The staff monitors the unattended area in real time through the monitoring device and can conduct key monitoring on the positions where alarms are sent, making the system automated. The diverse collection modules ensure the diversity of the collected signals, and at the same time enable the system to conduct danger warnings. The network receiving module and network sending module eliminate the need for personnel to be on-site. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic structural diagram of the system of the present invention;

[0065] Figure 2 It is a flowchart of the method of the present invention.

[0066] In the figure: Information collection device 10, camera 11, infrared grille 12, sound sensor 13, infrared sensor 14, position analysis module 20, infrared analysis module 30, controller 40, power supply system 50, network sending module 60, network receiving module 70, monitoring server 80, and monitoring device 90. Detailed implementation

[0067] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0068] Embodiment 1:

[0069] Please refer to Figure 1 , the present invention provides a technical solution:

[0070] An unattended area monitoring system includes an information collection device 10, a position analysis module 20, an infrared analysis module 30, a controller 40, a power supply system 50, a network sending module 60, a network receiving module 70, a monitoring server 80, and a monitoring device 90, where:

[0071] At least four groups of the information collection devices 10 are provided and installed around the unattended area to collect real-time video data, sound signal intensity data, infrared signal intensity magnitude, and grating real-time signals of the area.

[0072] Furthermore, the information collection device 10 includes a camera 11, an infrared grille 12, a sound sensor 13, and an infrared sensor 14. The camera 11 is installed inside the unattended area and electrically connected to the controller 40 for real-time collection of monitoring images. The infrared grille 12 is installed around the unattended area and electrically connected to the controller 40. The infrared grille 12 forms a grille by emitting laser light, and is received by another infrared grille 12. When the laser is blocked and cannot be received, the infrared grille 12 sends an alarm message for detecting whether the unattended area is invaded. The sound sensors 13 are evenly installed around the unattended area for detecting the strength of sound signals in the area. The infrared sensors 14 are evenly installed around the unattended area for detecting the intensity of infrared signals in the area.

[0073] The position analysis module 20 is electrically connected to the information collection device 10. Four sound sensors 13 within the area send the received sound signals to the position analysis module 20, which is used to receive the intensity data of the sound signals collected by the information collection device 10 to determine whether there is an abnormality. It is determined by whether the average value of the sound intensities collected by the four sound sensors 13 exceeds the safe sound intensity. When an abnormality occurs, the position coordinates of the hazard source are determined based on the sound signal time collected by each information collection device 10 and sent to the controller 40.

[0074] Further, four sound sensors 13 are arranged in four directions around the area. The specific logic for determining whether there is an abnormality based on the intensity data of the sound signals detected by the sound sensors 13 is as follows:

[0075] Calculate the average intensity p of the intensity data of the sound signals collected by the four sound sensors (13) x as;

[0076]

[0077] When p x is less than the safe sound intensity threshold p, it is in a safe state. When p x is greater than the safe sound intensity threshold p, it is in an abnormal state. p1, p2, p3, and p4 are the sound intensities collected by the four sound sensors 13 respectively.

[0078] Further, the specific logic for the position analysis module 20 to determine the hazard source coordinates based on the time length data of the intensity of the collected sound signals is as follows:

[0079] According to the time sequence of the detected sound signals, sort the times of the sound signals detected by the four sound sensors 13, which are t1, t2, t3, and t4 respectively;

[0080] Taking the acquisition time t1 as the reference, t2 = t1 + Δt2, t3 = t1 + Δt3, t4 = t1 + Δt4;

[0081] Establish a rectangular coordinate system. According to the distance between the coordinate position of the sensor acquisition point and the position coordinate of the sound transmission, through the sound propagation speed V 声 and time, the distance relationship equation between the coordinate of the acquisition point and the coordinate of the sound generation point can be obtained. The expression based on it is:

[0082] The acquisition coordinate L1(x l1 y l1 ) and the distance equation between the coordinate of the sound generation point L(x l y l ) is;

[0083]

[0084] The distance equation between the acquisition coordinate L2(x l2 y l2 ) and the coordinate L(x l y l ) of the sound generation point is;

[0085]

[0086] The distance equation between the acquisition coordinate L3(x l3 y l3 ) and the coordinate L(x l y l ) of the sound generation point is;

[0087]

[0088] The distance equation between the acquisition coordinate L3(x l3 y l3 ) and the coordinate L(x l y l ) of the sound generation point is;

[0089]

[0090] Among them, L1(x l1 y l1 ), L2(x l2 y l2 ), L3(x l3 y l3 ), L4(x l4 y l4 ) are the coordinates of 4 sound sensors 13 respectively, and L(x l y l ) represents the coordinate of the position where the detected sound occurs;

[0091] By calculating the distance from the coordinate L(x l y l ) of the sound generation point to the acquisition coordinate L1(x l1 y l1 ) and the acquisition coordinate L2(x l2 y l2 );

[0092]

[0093] The calculated distance R1 of the sound to L1(x l1 y l1 ) is R1 = t1 × V 声 ;

[0094] The distance of the sound to L2(xl2 y l2 ) The distance R2 = t2 × V 声 ;

[0095] The distance from the sound to L3(x l3 y l3 ) is R3 = t3 × V 声 ;

[0096] According to the formula of the rectangular coordinate system of a circle;

[0097] (x - a) 2 +(y - b) 2 = r 2

[0098] Taking L1(x l1 y l1 ), L2(x l2 y l2 ), L2(x l2 y l2 ) as the centers of circles, and R1, R2, R3 as the radii, calculate the coordinates L(x l y l ) of the sound generation point;

[0099]

[0100] Obtain the coordinates L(x l y l ) of the hazard source to determine its position.

[0101] The infrared analysis module 30 is electrically connected to the information collection device 10, and is used to receive the intensity of the infrared signal collected by the information collection device 10 to determine whether there is an abnormality, and when there is an abnormality, generate a risk index based on the infrared signal intensity data collected by each information collection device 10 according to the temperature and the size of the temperature area to determine what kind of alarm, and send it to the controller 40.

[0102] Furthermore, the specific logic for the infrared analysis module 30 to generate a risk index to determine what kind of alarm based on the infrared intensity data collected by the infrared sensor 14 is as follows: collect.

[0103] Use 4 infrared sensors 14 to divide the area to be detected into four areas with the same area for detection;

[0104] Calculate the risk index θ of each area, and the formula is:

[0105] θ = ae t ln t(s + sin s)

[0106] Among them, a is the temperature characteristic value within the area, and the intensity of the infrared signal detected by the infrared sensor 14 includes the temperature t and the temperature area s;

[0107] Set the safety threshold b within the area to determine the dangerous state of each area. The specific logic for determination is as follows:

[0108] When θ ≤ b, it is judged as a safe state;

[0109] When b < θ ≤ 5b, it is judged as a dangerous state;

[0110] When 5b < θ, it is judged as a characteristic dangerous state.

[0111] The controller 40 is electrically connected to the information collection device 10, the position analysis module 20, and the infrared analysis module 30. It is used to receive the real-time grating signal and real-time video data collected by the information collection device 10, judge the intrusion direction according to the position where the real-time grating signal is interrupted, and control the camera 11 to rotate to the alarm position in the dangerous area to monitor the real-time video of the area according to the alarm type. It receives the signal indicating whether the sound intensity is safe analyzed by the position analysis module 20, the position coordinate data of the hazard source, and the area danger index analyzed by the infrared analysis module 30.

[0112] The power supply system 50 is electrically connected to the controller 40 and is used to supply power to the monitoring system.

[0113] The network sending module 60 is electrically connected to the controller 40, and the controller 40 sends the processed results of the collected data to the network sending module 60.

[0114] The network receiving module 70 is electrically connected to the network sending module 60 and is used to receive the data sent by the network sending module 60 through the network to achieve long-distance real-time data transmission.

[0115] The monitoring server 80 is electrically connected to the network receiving module 70 and is used for the monitoring server 80 to read the remote data received by the network receiving module 70.

[0116] The monitoring device 90 is electrically connected to the monitoring server 80 and is used to display the data monitored by the monitoring server 80 in real time. The monitoring device 90 can display the alarm information in the unattended area in real time and conduct key monitoring according to the alarm type and alarm position.

[0117] Embodiment 2:

[0118] Please refer to Figure 2 , the present invention also provides a method for monitoring an unattended area. The monitoring method is executed by the above-mentioned unattended area monitoring system, and the steps include:

[0119] S1: Collect the real-time video data, the intensity data of the sound signal, the intensity of the infrared signal, and the real-time signal of the grating around the unattended area;

[0120] S2: Determine whether there is an abnormality based on the intensity data of the collected sound signal, and when there is an abnormality, determine the position coordinates of the hazard source according to the collected sound signal time;

[0121] S3: Determine whether there is an abnormality based on the intensity of the collected infrared signal, and when there is an abnormality, generate a danger index according to the intensity of the collected infrared signal, temperature, and temperature area size to determine what kind of alarm it is;

[0122] S4: Determine the intrusion direction according to the position where the collected real-time grating signal is interrupted, and control the camera to rotate to the dangerous area to monitor the real-time video of the area in real time according to the alarm type and alarm location;

[0123] S5: The controller sends the processing result of the collected data to the network sending module;

[0124] S6: Send the alarm information and the real-time video data of the area monitoring to the network receiving module through the wireless network to achieve long-distance real-time data transmission;

[0125] S7: The monitoring server reads the remote data sent from the controller received by the network receiving module;

[0126] S8: The monitoring device displays the alarm data received by the monitoring server in real time and focuses on monitoring according to the alarm type and alarm location.

[0127] The working principle of the present invention: When in use, the information collection device installed around the unattended area collects the real-time video, the strength of the sound signal, the intensity of the infrared signal, and the grating signal, and sends the collected data to the position analysis module, the infrared analysis module, and the controller for data processing. The controller judges what kind of alarm and the alarm location through the change of the collected values, and monitors the alarm occurrence location through the camera. The controller sends the judged result to the network receiving module through the network sending module to remotely transmit the data to the monitoring server for long-distance data transmission. The network receiving and sending module makes it more convenient for long-distance transmission in unattended areas. The power supply system ensures the stable operation of the system. The staff monitors the unattended area in real time through the monitoring device and can focus on monitoring the position where the alarm is sent, making the system automated. The diverse collection modules ensure the diversity of the collected signals, and at the same time enable the system to perform danger warning. The network receiving module and the network sending module eliminate the need for personnel to be on-site.

[0128] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An unattended area monitoring system, characterized in that, Including: An information collection device (10), with at least four groups of the information collection devices (10) installed around the unattended area to collect real-time video data of the area, intensity data of sound signals, magnitude of infrared signal intensity, and real-time grating signals; A position analysis module (20), electrically connected to the information collection device (10), for receiving the intensity data of the sound signals collected by the information collection device (10), analyzing and judging whether there is an abnormality in the sound intensity, judging the position coordinates of the hazard source based on the time difference of the sound signals collected by each information collection device (10), and sending them to the controller (40); An infrared analysis module (30), electrically connected to the information collection device (10), for receiving the intensity of the infrared signals collected by the information collection device (10) to judge whether there is an abnormality, and when there is an abnormality, generating a danger index based on the intensity data of the infrared signals collected by each information collection device (10), judging what kind of alarm it is according to the temperature and the size of the temperature area, and sending it to the controller (40); A controller (40), electrically connected to the information collection device (10), the position analysis module (20), and the infrared analysis module (30), for receiving the real-time grating signal and real-time video data collected by the information collection device (10), judging the intrusion direction according to the position where the real-time grating signal is interrupted, and controlling the camera (11) to rotate to the alarm position in the dangerous area to monitor the real-time video of the area according to the alarm type; A power supply system (50), electrically connected to the controller (40), for supplying power to the monitoring system; A network sending module (60), electrically connected to the controller (40), and the controller (40) sends the processed results of the collected data to the network sending module (60); A network receiving module (70), electrically connected to the network sending module (60), for receiving data sent from the network sending module (60) through the network to achieve long-distance real-time data transmission; A monitoring server (80), electrically connected to the network receiving module (70), for the monitoring server (80) to read the remote data received by the network receiving module (70); A monitoring device (90), electrically connected to the monitoring server (80), for real-time displaying the data monitored by the monitoring server (80), and conducting key monitoring according to the alarm type and the alarm position.

2. The unattended area monitoring system according to claim 1, characterized in that: The information collection device (10) includes a camera (11), an infrared grille (12), a sound sensor (13), and an infrared sensor (14). The camera (11) is installed in an unattended area and is electrically connected to a controller (40) for real-time collection of surveillance images. The infrared grille (12) is installed around the unattended area and is electrically connected to the controller (40) for detecting whether the unattended area has been invaded. The sound sensors (13) are evenly installed around the unattended area for detecting the strength signal of sound signals in the area. The infrared sensors (14) are evenly installed around the unattended area for detecting the intensity signal of infrared signals in the area.

3. The unattended area monitoring system according to claim 2, characterized in that: Four sound sensors (13) are provided in four directions around the area. The specific logic for judging whether there is an abnormality based on the intensity data of the sound signals detected by the sound sensors (13) is as follows: Calculate the average intensity p of the intensity data of the sound signals collected by four sound sensors (13) x where; When p x is less than the safe sound intensity threshold p, it is in a safe state. When p x is greater than the safe sound intensity threshold p, it is in an abnormal state. p1, p2, p3, and p4 are the sound intensities collected by four sound sensors (13) respectively.

4. The unattended area monitoring system according to claim 3, wherein: The specific logic for the position analysis module (20) to judge the coordinates of the hazard source based on the intensity data of the sound signals is as follows: According to the time sequence of the detected sound signals, sort the times of the sound signals detected by the four sound sensors (13) as t1, t2, t3, and t4 respectively; Taking the acquisition time t1 as a reference, t2 = t1 + Δt2, t3 = t1 + Δt3, t4 = t1 + Δt4; Establish a rectangular coordinate system. According to the distance between the coordinate position of the sensor acquisition point and the coordinate position of the sound transmission position, and through the speed V of sound propagation 声 and time, the distance relationship equation between the coordinates of the acquisition point and the coordinates of the sound generation point can be obtained. The expression relied on is as follows: The distance equation between the collected coordinate L1(x l1 y l1 ) and the coordinate L(x l y l ) where the sound occurs is as follows; The distance equation between the collected coordinate L2(x l2 y l2 ) and the coordinate L(x l y l ) where the sound occurs is as follows; The distance equation between the collected coordinate L3(x l3 y l3 ) and the coordinate L(x l y l ) of the sound generation point is; The distance equation between the collected coordinate L3(x l3 y l3 ) and the coordinate L(x l y l ) where the sound occurs is as follows; Among them, L1(x l1 y l1 ), L2(x l2 y l2 ), L3(x l3 y l3 ), L4(x l4 y l4 ) are the coordinates of 4 sound sensors (13) respectively, and L(x l y l ) represents the coordinates of the position where the detected sound occurs; By calculating the distance from the coordinate L(x l y l ) of the sound generation point to the acquisition coordinates L1(x l1 y l1 ) and the acquisition coordinates L2(x l2 y l2 ). Calculated that the distance R1 from the sound to L1(x l1 y l1 ) is R1 = t1 × V 声 ; Distance R2 from sound to L2(x l2 y l2 ) is R2 = t2 × V 声 ; Distance R3 from sound to L3(x l3 y l3 ) is R3 = t3 × V 声 ; According to the rectangular coordinate system formula of a circle; (x - a) 2 +(y - b) 2 = r 2 With L1(x l1 y l1 ), L2(x l2 y l2 ), L2(x l2y l2) as the centers and R1, R2, R3 as the radii, the coordinates L(x l y l ) of the sound generation point are calculated; (x - x l1 ) 2 +(y - y l1 ) 2 = r1 2 (x - x l2 ) 2 +(y - y l2 ) 2 = r2 2 (x - x l3 ) 2 +(y - y l3 ) 2 = r3 2 Obtain the coordinates L(x l y l ) of the position of the hazard source.

5. The unattended area monitoring system according to claim 2, wherein: The specific logic for the infrared analysis module (30) to generate a danger index based on the infrared intensity data collected by the infrared sensors (14) and judge what kind of alarm it is is as follows: collection; Use four infrared sensors (14) to divide the area to be detected into four areas with the same area for detection; Calculate the danger index θ of each area. The formula is as follows: θ = ae t ln t(s + sin s) Where a is the temperature characteristic value in the area. The infrared signal intensity detected by the infrared sensor (14) includes the temperature t and the temperature area s; Set the safety threshold b in the area and judge the danger state of each area. The specific logic for judgment is as follows: When θ ≤ b, it is judged as a safe state; When b < θ ≤ 5b, it is judged as a dangerous state; When 5b < θ, it is judged as a special dangerous state.

6. A method for monitoring unattended areas, characterized in that: The monitoring method is executed by an unattended area monitoring system according to any one of claims 1-6, including; S1: Collect the real-time image data, the intensity data of the sound signals, the magnitude of the intensity of the infrared signals, and the real-time signal of the grating around the unattended area; S2: Judge whether there is an abnormality according to the intensity data of the collected sound signals, and when there is an abnormality, judge the position coordinates of the hazard source according to the time of the collected sound signals; S3: Judge whether there is an abnormality according to the intensity of the collected infrared signals, and when there is an abnormality, generate a danger index based on the intensity of the collected infrared signals and the magnitude of the temperature and the temperature area to judge what kind of alarm it is; S4: Judge the intrusion direction according to the position where the real-time signal of the collected grating is interrupted, and according to the alarm type and the alarm position, control the camera to rotate to the dangerous area for real-time monitoring of the real-time images of the area; S5: The controller sends the processing result of the collected data to the network sending module; S6: Send the alarm information and the real-time picture data of area monitoring to the network receiving module through the wireless network to achieve long-distance real-time data transmission; S7: The monitoring server reads the remote data sent from the controller received by the network receiving module; S8: The monitoring device displays the alarm data received by the monitoring server in real time and conducts key monitoring according to the alarm type and the alarm location.

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