Runway state photoelectric coupling one-way transmission method for air traffic control physical isolation network

Abstract

The invention discloses a runway state photoelectric coupling one-way transmission method for an air traffic control physical isolation network, which comprises an air traffic control network system and an application end network system, the application end network system internally comprises a photoelectric coupler system, and the photoelectric coupler system comprises a video acquisition device and a video processing device. The video acquisition device and the video processing device are in one-way transmission connection through photoelectric coupling; the video acquisition device performs video frame acquisition on the air traffic control display, converts video frame codes into optical signals and unidirectionally transmits the optical signals to the video processing device through photocoupling, and the video processing device converts the optical signals into electric signals and decodes and stores the electric signals as air traffic control network system data; and a runway state extraction and recognition system of the video processing device recognizes and extracts runway state data from the air traffic control network system data. According to the invention, safe and reliable authorization data one-way transmission of the air traffic control network system is realized, and the system security is improved.

Description

Technical Field

[0001] The present invention relates to the field of one-way information security transmission from the civil aviation air traffic control physical isolation network to the airport, and particularly relates to an optoelectronic coupling one-way transmission method for runway status in the air traffic control physical isolation network. Background Art

[0002] The air traffic control information system (also referred to as the air traffic control network system in this article) is a core system related to flight safety and flight takeoff and landing. The air traffic control system is based on an operating system with high security and strong real-time performance, and requires high precision and real-time response; the air traffic control information system is physically isolated to prevent external unauthorized access, potential attacks, and avoid information leakage or tampering. At the same time, it is necessary to avoid interference from the business fluctuations and failures of other information systems (such as the airport information system, which is a kind of application-side network system in this article). For example, the network cables of the air traffic control information system and the airport information system are laid separately in the physical path, and the two are completely physically isolated. Under normal circumstances, data transmission between two physically isolated networks is carried out manually or through devices like a network gateway. Manual transmission essentially still requires the two networks to access storage media at different times and spatial / logical positions. This kind of transmission is generally carried out manually, using optical, magnetic, or semiconductor storage media; the storage media can be read and written, usually used once or multiple times. If the management of the storage media is not strict, there is still a possibility of network intrusion; the most common is the intrusion of viruses, Trojans, etc. into the network receiving information; in actual business, it is almost infeasible to use manual data transmission for systems or networks that require high-frequency synchronization.

[0003] A network gateway is a device that automatically transmits data between physically isolated networks; many data transmissions involving physically isolated networks are achieved through a unidirectional network gateway, such as a method and system for remote data acquisition across a network gateway in a new energy power station (application number: CN202411372478.7), a privacy computing method, data sharing system, and electronic device based on physical isolation (CN202411330273.2), a cross-network data transmission system, method, and data transmission network gateway (CN202411168769), a method, device, and equipment for cross-network structured and unstructured data synchronization (CN2024110360168), etc. Network gateway devices control data to be transmitted in only one direction through software, and the reverse direction is completely blocked. A network gateway usually includes two independent hardware modules, which are respectively connected to two isolated networks. After a series of security checks and protocol conversions, the data is transmitted unidirectionally.

[0004] In practice, using a network isolation device has many inconveniences. This includes the fact that in fact, when using a network isolation device, new equipment also needs to be added to the existing network, and data is unidirectionally transmitted to another network through the new device, i.e., the "network isolation device". However, as a device itself, connecting a network isolation device to an existing service network will also bring certain risks. Usually, it requires complex technical and management processes, and the security of the network isolation device itself will also bring new risks. If the network isolation device itself is invaded, it will bring huge risks to the system. Summary of the Invention

[0005] The purpose of the present invention is to provide a runway status optoelectronic coupling unidirectional transmission method for an air traffic control physical isolation network. The video acquisition device of the optoelectronic coupler system performs video frame acquisition on the air traffic control display and converts it into an optical signal, which is unidirectionally transmitted to the video processing device through optoelectronic coupling. The runway status extraction and recognition system of the video processing device performs recognition and extracts key runway status data, realizing the unidirectional transmission of authorized data for air traffic control physical isolation and enhancing the security of the air traffic control network system.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A runway status optoelectronic coupling unidirectional transmission method for an air traffic control physical isolation network, including an air traffic control network system and an application-side network system. The air traffic control network system includes an air traffic control display. The application-side network system internally includes an optoelectronic coupler system. The optoelectronic coupler system includes a video acquisition device and a video processing device. The video acquisition device is correspondingly arranged with the air traffic control display in the air traffic control network system; the video acquisition device and the video processing device are connected through optoelectronic coupling unidirectional transmission;

[0008] The video acquisition device performs video frame acquisition on the air traffic control display. The video acquisition device encodes and converts the video frame into an optical signal, and the video acquisition device unidirectionally transmits the optical signal to the video processing device through optoelectronic coupling. The video processing device converts the optical signal into an electrical signal and decodes and stores it as data of the air traffic control network system. The video processing device internally has a runway status extraction and recognition system, and the runway status extraction and recognition system recognizes and extracts runway status data from the data of the air traffic control network system.

[0009] To better implement the present invention, the method for extracting and recognizing runway status text in an air traffic control network system of the present invention is as follows: The runway status data is key runway status information, and the runway status data includes runway information, whether the runway is under inspection, and whether the runway status is an open state or a closed state; The runway status extraction and recognition system uses an optical character recognition algorithm to extract and recognize from the air traffic control network system data whether the runway is under inspection and the corresponding runway information; If the recognized runway corresponding characters are as follows: "under inspection", "inspection" + "check", "inspection" + "in", "check" + "in", then it is determined that the runway is under inspection, otherwise the runway is not under inspection;

[0010] The runway status extraction and recognition system also performs verification through character color, and the method is as follows: Convert the air traffic control network data image to the HSV format, extract the hue and saturation channels and filter to obtain a binary red area mask, calculate the pixel average value in the air traffic control network data image, and when the air traffic control network data image minus the pixel average value exceeds threshold A, it is determined that the status verification of the runway being under inspection passes; If the verification fails, it is set to pending or set to the status where the previous frame of the air traffic control network data image passed the verification;

[0011] If the recognized runway corresponding characters are "open" or "open" + "release", then it is determined that the runway is in an open state;

[0012] If the recognized runway corresponding characters are "closed" or "closed" + "close", then it is determined that the runway is in a closed state.

[0013] The method for extracting and recognizing runway status graphics in an air traffic control network system of the present invention is as follows: The runway status data is key runway status information, and the runway status data includes runway information and whether the runway status is an open state or a closed state; The runway status extraction and recognition system uses image processing technology to extract and recognize runway information and runway status from the air traffic control network system data, and the runway status includes an open state or a closed state, and the method is as follows:

[0014] Convert the air traffic control network data image to the HSV format, set the upper and lower limit HSV values of the characteristic red color of the runway, and use the inRange algorithm to filter the characteristic red color to obtain a binary image mask_R; Set the upper and lower limit HSV values of the characteristic green color of the runway opening, and use the inRange algorithm to filter the characteristic green color to obtain a binary image mask_G; Calculate the pixel mean value R of the binary image mask_R, and calculate the pixel mean value G of the binary image mask_G; If the pixel mean value R > the pixel mean value G, and the pixel mean value R minus the pixel mean value G is greater than threshold B1, then the runway status corresponding to the runway information is determined to be a closed state; If the pixel mean value R < the pixel mean value G, and the pixel mean value G minus the pixel mean value R is greater than threshold B2, then the runway status corresponding to the runway information is determined to be an open state.

[0015] Another method for graphically recognizing and extracting the runway status in an air traffic control network system of the present invention is as follows: The runway status data is key runway status information, and the runway status data includes runway information and whether the runway status is an open state or a closed state; The runway status extraction and recognition system uses image processing technology to extract and recognize runway information and runway status from the air traffic control network system data. The runway status includes an open state or a closed state. The method is as follows:

[0016] Convert the air traffic control network data image to the HSV format, set the upper and lower limits of the HSV values of the characteristic red color of the runway, set the upper and lower limits of the HSV values of the characteristic green color of the open runway, use the characteristic red and characteristic green to filter and extract the binary red mask image and green mask image from the air traffic control network data image respectively. Use the findContours method to extract the graphic contours of the red mask image and green mask image respectively and filter out the graphic contours with an area smaller than the area threshold C. Fit and calculate the length and width of the outer quadrilateral of the graphic contour for the remaining graphic contours of the red mask image and green mask image respectively. If the aspect ratio of the outer quadrilateral of the fitted graphic contour is greater than D1, the width is greater than the threshold D2, and it is located in the red mask image, the runway status corresponding to the runway information is determined to be in the closed state; If the aspect ratio of the outer quadrilateral of the fitted graphic contour is greater than D1, the width is greater than the threshold D2, and it is located in the green mask image, the runway status corresponding to the runway information is determined to be in the open state.

[0017] Preferably, the runway status extraction and recognition system extracts time information from the air traffic control network system data. The time information is transmitted together with the runway status data. Perform a lag check on the extracted time information and the current local time. If the lag of the extracted time information is greater than the lag threshold, output a transmission lag warning and at the same time set the temporary warning mark of the runway status of the runway information to the open state.

[0018] Preferably, the air traffic control display of the air traffic control network system is connected to a video signal distributor, and a display specifically corresponding to the video acquisition device is connected to the video signal distributor.

[0019] Preferably, the video processing device includes a data receiving thread, a data buffer, and a data processing thread. The data receiving thread is used to convert the optical signal into an electrical signal and decode and process it into air traffic control network system data. The data buffer is used to buffer the air traffic control network system data. The data processing thread uses multiple threads to perform data processing on multiple frames of air traffic control network system data.

[0020] Preferably, a one-way optoelectronic coupling transmission using a key encryption method is adopted between the video acquisition device and the video processing device.

[0021] Preferably, the application - side network system includes an airport business network system and a runway intrusion prevention system. The runway status extraction and recognition system of the video processing device uses a rabbitmq message queue for transmission in the application - side network system.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] (1) The present invention is dedicated to the one - way secure transmission of runway status data in the air traffic control network system. It will not add any software or hardware connections to the air traffic control network system and will not pose a security impact on the air traffic control network system. A photoelectric coupler system is constructed. The video acquisition device of the photoelectric coupler system captures video frames of the air traffic control display and converts them into optical signals for one - way transmission to the video processing device through photoelectric coupling. The runway status extraction and recognition system of the video processing device identifies and extracts key runway status data, realizing the one - way transmission of authorized data with air traffic control physical isolation and enhancing the security of the air traffic control network system.

[0024] (2) The present invention provides a photoelectric - coupling one - way transmission method for the physically isolated air traffic control network system, realizing the reliable one - way transmission of the physically isolated network and improving the system security. The present invention can also be adapted to other physically isolated systems with high security requirements and small data transmission volumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is the structural schematic diagram of the first embodiment of the present invention;

[0026] Figure 2 is the schematic diagram of the runway status showing a red check in the electronic progress - sheet system of the air traffic control network system in the embodiment;

[0027] Figure 3 is the schematic diagram of the air traffic control network system in the embodiment showing only the graphic display of the runway open state;

[0028] Figure 4 is the schematic diagram of the air traffic control network system in the embodiment showing only the graphic display of the runway closed state;

[0029] Figure 5 is the schematic diagram after the green mask image filtering process in the embodiment;

[0030] Figure 6 is the schematic diagram after the red mask image filtering process in the embodiment;

[0031] Figure 7 is the structural schematic diagram of the second embodiment of the present invention.

[0032] Among them, the names corresponding to the reference numerals in the drawings are:

[0033] 1 - Air traffic control display, 11 - Video signal distributor, 12 - Special display, 2 - Video acquisition device, 3 - Video processing device. Detailed implementation manner

[0034] The present invention will be further described in detail below in conjunction with embodiments:

[0035] Embodiment

[0036] As Figure 1 shown, a runway status optoelectronic coupling unidirectional transmission method for an air traffic control physical isolation network includes an air traffic control network system and an application - side network system (the application - side network system includes an airport service network system and a runway intrusion prevention system, and the runway status extraction and recognition system of the video processing device uses a rabbitmq message queue for transmission in the application - side network system). The air traffic control network system includes an air traffic control display 1. The application - side network system internally includes an optoelectronic coupler system (the optoelectronic coupler system can also be Figure 1 a separate system). The optoelectronic coupler system includes a video acquisition device 2 and a video processing device 3. The video acquisition device is correspondingly arranged with the air traffic control display in the air traffic control network system (the air traffic control network system will not add any software or hardware devices, and external connection will not affect the air traffic control network system); the video acquisition device and the video processing device are connected by optoelectronic coupling unidirectional transmission (further preferably, the video acquisition device and the video processing device also use optoelectronic coupling unidirectional transmission with a key encryption method).

[0037] The video acquisition device performs video frame acquisition on the air traffic control display (for the human - machine interface displayed on the air traffic control display, such as the electronic progress sheet and the surface surveillance interface displayed on the display, the video acquisition device performs video frame image acquisition and optoelectronically couples and unidirectionally transmits it to the video processing device). The video acquisition device encodes and converts the video frame into an optical signal, and the video acquisition device unidirectionally transmits the optical signal to the video processing device through optoelectronic coupling. The video processing device converts the optical signal into an electrical signal and decodes and stores it as air traffic control network system data. The video processing device internally has a runway status extraction and recognition system, and the runway status extraction and recognition system identifies and extracts runway status data from the air traffic control network system data; the runway status data in this embodiment is key runway status information, and the runway status data includes runway information, whether the runway is under inspection, and whether the runway status is an open state or a closed state.

[0038] The runway status data of the present invention is crucial runway status information, and the runway status data includes runway information, whether the runway is under inspection, and whether the runway status is open or closed; in the air traffic control network system, the runway status is generally displayed in text or / and graphics, and the present invention can be compatible with the recognition and extraction of runway status in text and graphics. In the air traffic control network system, the runway status of runway information is displayed in text, generally in two forms (the air traffic control network system selects one of the two forms or the display screen displays them at different times). First, when the runway status is closed, it is displayed as "Under Inspection" in red text, and its runway status is the closed state; when the runway status of runway information does not display "Under Inspection" in red text (as shown in Figure 2 shown, a certain runway is marked as "Under Inspection" in red font, Figure 2 only the runway marked as "Under Inspection" in red font is displayed, and the runway status will only be displayed when the other runways are skipped and displayed. Irrelevant content in the figure is blurred), its runway status is the open state; second, the closed state of the runway status is directly marked and displayed as "Closed", and the open state of the runway status is directly marked and displayed as "Open". For the air traffic control network system that uses the red text of "Under Inspection" to display the runway status, the present invention can perform extraction recognition and unidirectional transmission. The runway status extraction and recognition system of the present invention uses an optical character recognition algorithm to extract and recognize from the air traffic control network system data whether the runway is under inspection and the corresponding runway information; if the extracted and recognized runway corresponding characters are as follows: "Under Inspection", "Inspection" + "Check", "Inspection" + "Under", "Check" + "Under", it is determined that the runway is under inspection (in general, if two of "Inspection", "Check", and "Under" appear, it is determined that the runway is in the inspection state, that is, the closed state), otherwise the runway is not under inspection. The runway status extraction and recognition system also performs verification through character color, and the method is as follows: convert the air traffic control network data image to the HSV format, extract the hue and saturation channels and filter to obtain the binary red region mask, calculate the pixel average value in the air traffic control network data image, and when the air traffic control network data image minus the pixel average value exceeds the threshold A (verification determines that the runway is indeed in the occupied state, that is, under inspection), it is determined that the state verification of the runway being under inspection passes; if the verification fails, it is set as pending or set to the state where the previous frame of air traffic control network data image verification passes; in order to ensure runway safety, only when the runway status is verified to be "Under Inspection" can it be considered that the runway status is the closed state.

[0039] For the air traffic control network system that directly uses "Open" or "Closed" in text to display the runway status, the present invention can perform extraction recognition and unidirectional transmission. If the extracted and recognized runway corresponding characters are "Open" or "Open" + "Release", it is determined that the runway is in the open state; if the extracted and recognized runway corresponding characters are "Closed" or "Closed" + "Shut", it is determined that the runway is in the closed state.

[0040] The runway status data in this embodiment is critical runway status information. The runway status data includes runway information and whether the runway status is an open state (allowing aircraft takeoff and landing, not allowing vehicles to enter) or a closed state (not allowing aircraft takeoff and landing, allowing authorized ground vehicles to enter). When the runway status of the runway information in the air traffic control network system is displayed in a graphical manner, the present invention can perform extraction, recognition, and unidirectional transmission. The first method is as follows: The runway status extraction and recognition system of the present invention uses image processing technology to extract and recognize runway information and runway status from the data of the air traffic control network system. The runway status includes an open state or a closed state. The method is as follows: Convert the air traffic control network data image to the HSV format, set the upper and lower limits of the HSV values of the runway feature red, and use the inRange algorithm to perform feature red filtering to obtain a binary image mask_R (see Figure 6 , extract the feature green filtering to obtain a binary image mask_R); set the upper and lower limits of the HSV values of the runway open feature green, and use the inRange algorithm to perform feature green filtering to obtain a binary image mask_G (see Figure 5 , extract the feature green filtering to obtain a binary image mask_G); calculate the pixel mean R of the binary image mask_R, and calculate the pixel mean G of the binary image mask_G; if the pixel mean R > pixel mean G, and the pixel mean R minus the pixel mean G is greater than the threshold B1, then the runway status corresponding to the runway information is determined to be a closed state; if the pixel mean R < pixel mean G, and the pixel mean G minus the pixel mean R is greater than the threshold B2, then the runway status corresponding to the runway information is determined to be an open state.

[0041] When the runway status of the runway information in the air traffic control network system is displayed in a graphical manner, the second method of the present invention is as follows: The runway status data is critical runway status information. The runway status data includes runway information and whether the runway status is an open state or a closed state; the runway status extraction and recognition system uses image processing technology to extract and recognize runway information and runway status from the data of the air traffic control network system. The runway status includes an open state or a closed state. The method is as follows: Convert the air traffic control network data image to the HSV format, set the upper and lower limits of the HSV values of the runway feature red, set the upper and lower limits of the HSV values of the runway open feature green, and use the feature red and feature green to filter and extract the binary red mask image and green mask image from the air traffic control network data image respectively. Use the findContours method to extract the graphic contours of the red mask image and green mask image respectively and filter out the graphic contours with an area smaller than the area threshold C. For example: If the air traffic control network data image shows that the runway is open, the air traffic control network data image is shown as Figure 3 shown in ( Figure 3To intercept the runway status area only shown in the air traffic control network data image frame, feature green filtering is used to extract the binary green mask image as Figure 5 shown (extracting the Figure 3 open identification of the green triangle in it); if the air traffic control network data image shows that the runway is closed, the air traffic control network data image is shown as Figure 4 shown ( Figure 4 To intercept the runway status area only shown in the air traffic control network data image frame, feature red filtering is used to extract the binary red mask image as Figure 6 shown (extracting the Figure 4 red runway identification in it, that is, the entire runway is filled with red, indicating that the runway is in a closed state). For the remaining graphic contours of the red mask image and the green mask image (only leaving multiple continuous triangles representing open features or rectangles representing runway disabled features at this time), the length and width of the quadrilateral outside the graphic contour are respectively calculated by fitting (as Figure 5 shown, there are several triangles arranged in a straight line in the green mask image. Each pixel point of the binary white triangle is the number 1, and each pixel point of the binary black area is the number 0. Figure 5 The upper left, upper right, lower left, and lower right boundary points of the triangles arranged in a straight line in Figure 6 can be recognized. The upper left, upper right, lower left, and lower right four boundary points will form the outer boundary of the quadrilateral graphic contour, and the length and width of the quadrilateral are judged for the aspect ratio, width, etc.; as Figure 6 shown, the red mask image is the runway area, that is, the entire runway is marked red and closed or disabled. Each pixel point of the binary white rectangle in the red mask image is the number 1, and each pixel point of the binary black area is the number 0. Figure 6 The upper left, upper right, lower left, and lower right boundary points of the rectangular runway area can be recognized. The upper left, upper right, lower left, and lower right four boundary points will form the outer boundary of the quadrilateral graphic contour, and the length and width of the quadrilateral are judged for the aspect ratio, width, etc.). If the aspect ratio of the quadrilateral outside the graphic contour obtained by fitting is greater than D1, the width is greater than the threshold D2, and it is located in the red mask image, the runway status corresponding to the runway information is determined to be in the closed state; if the aspect ratio of the quadrilateral outside the graphic contour obtained by fitting is greater than D1, the width is greater than the threshold D2, and it is located in the green mask image, the runway status corresponding to the runway information is determined to be in the open state.

[0042] In some embodiments, the runway status extraction and recognition system extracts time information from the air traffic control network system data. The time information is transmitted together with the runway status data. The extracted time information is lag-checked with the current local time. If the lag of the extracted time information is greater than the lag threshold, a transmission lag warning is output and at the same time the runway status temporary warning mark of the runway information is placed in the open state.

[0043] As Figure 7 shown, currently, the air traffic control display of some air traffic control network systems is connected to a video signal distributor (connected to a display dedicated to data acquisition through the video signal distributor. For some air traffic control network systems with a video signal distributor 11 that outputs multiple signals, one of which is for video frame acquisition by the video acquisition device 2 and...), and a display dedicated to corresponding to the video acquisition device 2 is connected to the video signal distributor 11( Figure 7 dedicated display 12).

[0044] In some embodiments, the video processing device of the present invention includes a data receiving thread, a data buffer, and a data processing thread (the data receiving thread and the data processing thread are decoupled and processed independently as separate threads for timely reception and image processing). The data receiving thread is used to convert the optical signal into an electrical signal and decode it into air traffic control network system data. The data buffer is used to buffer the air traffic control network system data. The data processing thread uses multiple threads to process the data of multiple frames of air traffic control network system data.

[0045] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for photoelectrically coupling one-way transmission of runway status in an air traffic control physical isolation network, comprising an air traffic control network system and an application end network system, wherein the air traffic control network system comprises an air traffic control display, and is characterized in that: The application end network system internally includes a photoelectric coupler system, which includes a video acquisition device and a video processing device. The video acquisition device is set corresponding to the air traffic control display in the air traffic control network system; the video acquisition device and the video processing device are connected through a photoelectric coupling unidirectional transmission; The video acquisition device acquires video frames from the air traffic control display, and the video acquisition device converts the video frame encoding into an optical signal, and the video acquisition device transmits the optical signal unidirectionally to the video processing device through photoelectric coupling, and the video processing device converts the optical signal into an electrical signal and decodes and stores it as air traffic control network system data. The video processing device has a runway status extraction and recognition system inside, and the runway status extraction and recognition system identifies and extracts the runway status data from the air traffic control network system data.

2. The runway status photoelectric coupling unidirectional transmission method for air traffic control physical isolation network according to claim 1 is characterized in that: The runway status data is key runway status information, including runway information, whether the runway is under inspection, and whether the runway is open or closed; the runway status extraction and recognition system uses an optical character recognition algorithm to extract and recognize whether the runway is under inspection and the corresponding runway information from the air traffic control network system data; if the extracted and recognized runway corresponding characters are as follows: "inspection", "inspection" + "inspection", "inspection" + "in", "inspection" + "in", then it is determined that the runway is under inspection, otherwise the runway is not under inspection; The runway status extraction and recognition system also verifies through character color, the method is as follows: convert the air traffic control network data image into HSV format, extract the hue and saturation channels and filter to obtain the binary red area mask, calculate the pixel average value in the air traffic control network data image, when the air traffic control network data image minus the pixel average value exceeds the threshold A, it is judged that the runway is in the inspection state and the verification is passed; If the verification fails, it is set to pending or set to the status of the previous frame of air traffic control network data image verification passing; If the characters corresponding to the runway are extracted and recognized as "Open" or "Open" + "Release", it is determined that the runway is in an open state; If the character corresponding to the runway is extracted and recognized as "close" or "close" + "close", it is determined that the runway is in the closed state.

3. The runway status photoelectric coupling unidirectional transmission method for air traffic control physical isolation network according to claim 1 or 2, characterized in that: The runway status data is key runway status information, including runway information and whether the runway status is open or closed; the runway status extraction and recognition system uses image processing technology to extract and recognize the runway information and runway status from the air traffic control network system data, and the runway status includes open or closed status, and the method is as follows: Convert the air traffic control network data image into HSV format, set the upper and lower HSV limits of the runway feature red, and use the inRange algorithm to filter the feature red to obtain a binary image mask_R; set the upper and lower HSV limits of the runway open feature green, and use the inRange algorithm to filter the feature green to obtain a binary image mask_G; calculate the pixel mean R of the binary image mask_R, and calculate the pixel mean G of the binary image mask_G; If the pixel mean R>pixel mean G, and the pixel mean R minus the pixel mean G is greater than the threshold B1, the runway state of the corresponding runway information is judged to be a closed state; if the pixel mean R<pixel mean G, and the pixel mean G minus the pixel mean R is greater than the threshold B2, the runway state of the corresponding runway information is judged to be an open state.

4. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The runway status data is key runway status information, including runway information and whether the runway status is open or closed; the runway status extraction and recognition system uses image processing technology to extract and recognize the runway information and runway status from the air traffic control network system data, and the runway status includes open or closed status, and the method is as follows: The air traffic control network data image is converted into HSV format, the upper and lower HSV limits of the runway feature red are set, and the upper and lower HSV limits of the runway open feature green are set. The air traffic control network data image is filtered and extracted using the feature red and feature green to obtain a binary red mask image and a green mask image. The findContours method is used to extract the graphic contours of the red mask image and the green mask image, and the graphic contours with an area less than the area threshold C are filtered out respectively. The remaining graphic contours of the red mask image and the green mask image are fitted to calculate the length and width of the outer quadrilateral of the graphic contour. If the length-to-width ratio of the outer quadrilateral of the fitted graphic contour is greater than D1, the width is greater than the threshold D2, and it is located in the red mask image, the runway state of the corresponding runway information is determined to be a closed state; if the length-to-width ratio of the outer quadrilateral of the fitted graphic contour is greater than D1, the width is greater than the threshold D2, and it is located in the green mask image, the runway state of the corresponding runway information is determined to be an open state.

5. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The runway status extraction and identification system extracts time information from the air traffic control network system data, and the time information is transmitted together with the runway status data. A lag verification is performed on the extracted time information and the current local time. If the lag of the extracted time information is greater than a lag threshold, a transmission lag warning is output and a temporary runway status warning mark of the runway information is placed in an open state.

6. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The air traffic control display of the air traffic control network system is connected to a video signal distributor, and the video signal distributor is connected to a display specifically used to correspond to the video acquisition device.

7. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The video processing device includes a data receiving thread, a data cache and a data processing thread. The data receiving thread is used to convert optical signals into electrical signals and decode and process them into air traffic control network system data. The data cache is used to cache air traffic control network system data. The data processing thread uses multiple threads to perform data processing of multiple frames of air traffic control network system data.

8. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The video acquisition device and the video processing device use a key-encrypted photoelectric coupling unidirectional transmission.

9. The method for photoelectrically coupling one-way transmission of runway status for air traffic control physical isolation network according to claim 1, characterized in that: The application-end network system includes an airport business network system and a runway anti-intrusion system, and the runway state extraction and recognition system of the video processing device adopts a rabbitmq message queue for transmission in the application-end network system.

Images