Black box magnetic induction searching device and method

Abstract

The invention provides a black box magnetic induction searching device and method.The black box magnetic induction searching device comprises an MCU main control circuit, a data acquisition front-end processing circuit and a magnetic gradient sensor, the magnetic gradient sensor comprises two magnetic probes used for detecting the magnetic field intensity of different positions, and the two magnetic probes form a magnetic gradient difference; the magnetic gradient sensor is connected with the input end of the data acquisition front-end processing circuit, the output end of the data acquisition front-end processing circuit is connected with the MCU main control circuit, and the data acquisition front-end processing circuit is used for converting an acquired analog magnetic signal into a digital signal and then sending the digital signal to the MCU main control circuit for analysis and processing. And the MCU main control circuit matches the acquired magnetic field intensity data with a preset magnetic field intensity threshold value, and determines the position of the black box according to a matching result. According to the invention, accurate positioning and searching of the black box at the depth of 0.5 m from the ground are realized, the problem that the black box cannot be searched and positioned when an airplane crashes on the land is solved, and rapid and effective searching of the black box on the land is realized.

Description

Technical Field

[0001] This invention relates to the field of black box detection technology, specifically to a black box magnetic induction search device and method. Background Technology

[0002] Currently, based on positioning and search requirements, the methods followed are the use of conspicuous markings (orange-red color and reflective stripes) and underwater locating beacons, as required by international civil aviation standards. Conspicuous markings are used for positioning and searching of the protective recorder when it is visually visible, while underwater locating beacons are used for positioning and searching using specific sonar signals. These two positioning methods have limitations in specific aircraft crash scenarios, such as when the protective recorder is buried in mud or sand during a crash, rendering the conspicuous markings and underwater locating beacons ineffective and posing significant challenges to the search for the protective recorder.

[0003] Existing technology (CN109884648A) discloses a sonar device for locating and searching aircraft black boxes, including a search sonar combination system, a real-time information processing subsystem, and a search sonar main control system. This technology, by installing the search sonar combination system, real-time information processing subsystem, and search sonar main control system on a search platform, can achieve real-time listening, direction finding, and precise location of the black box's acoustic beacon signals, while simultaneously providing navigation information to the search platform, enabling rapid and effective searching of the black box. The limitation is that this sonar search device is only suitable for rapid searching of aircraft black boxes in the initial stages after a water-damaged aircraft crash, and cannot be used for aircraft crashed on land. Summary of the Invention

[0004] In view of this, embodiments of this application provide a magnetic induction search device and method for black boxes, so as to achieve the purpose of accurately locating black boxes on land.

[0005] This application provides the following technical solution: a black box magnetic induction search device, comprising: an MCU main control circuit, a data acquisition front-end processing circuit, and a magnetic gradient sensor. The magnetic gradient sensor includes two magnetic probes for detecting magnetic field strength at different locations, and the two magnetic probes form a magnetic gradient difference. The magnetic gradient sensor is connected to the input terminal of the data acquisition front-end processing circuit, and the output terminal of the data acquisition front-end processing circuit is connected to the MCU main control circuit. The magnetic gradient sensor is used to convert the acquired analog magnetic signals into digital signals and then send them to the MCU main control circuit for analysis and processing. The MCU main control circuit matches the acquired magnetic field strength data with a preset magnetic field strength threshold and determines the location of the black box based on the matching result.

[0006] According to one embodiment of this application, the magnetic gradient sensor further includes two magnetic signal conditioning circuits, which are respectively connected to the two magnetic probes and are used to amplify and filter the weak magnetic signals detected by the two magnetic probes.

[0007] According to one embodiment of this application, the MCU main control circuit includes a micro-disc GPS module, which is used to acquire the geographical location information of the magnetic gradient sensor in real time.

[0008] According to one embodiment of this application, the MCU main control circuit further includes a FLASH storage control circuit, which is used to manage and control the FLASH memory to store the magnetic signal data acquired by the magnetic gradient sensor, the geographical location information acquired by the micro-disc GPS module, and the magnetic field strength threshold.

[0009] According to one embodiment of this application, the MCU main control circuit further includes an RS485 conversion circuit, which converts the signal format output by the MCU main control circuit into a signal format conforming to the RS485 standard, for realizing long-distance, high-speed data transmission and interaction between the magnetic induction search device and other devices.

[0010] According to one embodiment of this application, the MCU main control circuit further includes an audible and visual alarm control circuit, which is used to provide an audible and visual alarm reminder after the MCU main control circuit successfully matches the acquired magnetic field strength data with a preset magnetic field strength threshold.

[0011] According to one embodiment of this application, the MCU main control circuit further includes an LCD touch screen, which is used to provide a human-machine interface to display in real time the working status of the sensing and searching device, magnetic signal data, and geographical location information acquired by the micro-disc GPS module.

[0012] This application also provides a search method for a black box magnetic induction search device as described above, including: The magnetic gradient sensor collects the geomagnetic field strength of a set environmental background and the magnetic field strength of a crash test at different locations in the set environmental background. Based on the geomagnetic field strength and the magnetic field strength of the crash test at different locations, a magnetic field strength threshold is determined and stored in the MCU main control circuit. The magnetic field strength under actual working conditions is acquired by the magnetic gradient sensor, the magnetic field strength under actual working conditions is conditioned, and the conditioned analog magnetic signal is converted into a digital signal and sent to the MCU main control circuit for analysis and processing. The MCU main control circuit matches the acquired magnetic field strength under actual working conditions with a preset magnetic field strength threshold, and determines the location of the black box based on the matching result.

[0013] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above-mentioned technical solutions adopted in the embodiments of this specification include at least the following: the embodiments of the present invention can achieve precise positioning and search of the black box at a depth of 0.5m above the ground, which solves the problem that the prior art cannot search and locate the black box when the aircraft crashes on land, and realizes rapid and effective search for the black box on land. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a block diagram showing the composition and connection of each module of the black box magnetic detection device according to an embodiment of the present invention; Figure 2 This is a technical roadmap diagram of the black box magnetic detection method according to an embodiment of the present invention; Among them, 1, 2 - magnetic probe, 3, 4 - magnetic signal conditioning circuit, 5 - data acquisition front-end processing circuit, 6 - MCU main control circuit, 7 - micro disc GPS module, 8 - FLASH storage control circuit, 9 - RS485 conversion circuit, 10 - LCD touch screen, 11 - sound and light alarm control circuit. Detailed Implementation

[0016] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0017] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] This invention provides a black box magnetic induction search device, including: an MCU main control circuit, a data acquisition front-end processing circuit, and a magnetic gradient sensor. The magnetic gradient sensor includes two magnetic probes for detecting the magnetic field strength at different locations, and the two magnetic probes form a magnetic gradient difference. The magnetic gradient sensor is connected to the input terminal of the data acquisition front-end processing circuit, and the output terminal of the data acquisition front-end processing circuit is connected to the MCU main control circuit. It is used to convert the acquired analog magnetic signals into digital signals and then send them to the MCU main control circuit for analysis and processing. The MCU main control circuit matches the acquired magnetic field strength data with a preset magnetic field strength threshold and determines the location of the black box based on the matching result.

[0019] This invention, based on the materials and configuration of black boxes, utilizes a fluxgate sensor-based magnetic detector to search for black boxes buried in mud and sand after aircraft crashes. For example... Figure 1 As shown, the black box magnetic detector consists of two magnetic probes 1 and 2. The two probes create a magnetic gradient difference to reduce the influence of the Earth's magnetic field on the magnetic signal. The two magnetic probes generate two magnetic signal conditioning circuits 3 and 4, which then pass through the data acquisition front-end processing circuit 5 to the MCU main control circuit 6. The MCU main control circuit 6 consists of a miniature circular GPS module 7, a FLASH storage control circuit 8, an RS485 conversion circuit 9, an audible and visual alarm control circuit 11, and an LCD touchscreen 10. The magnetic characteristics of the black box material are stored in the magnetic device. By displaying the magnetic field data, a successful match triggers the audible and visual alarm.

[0020] In practice, two magnetic gradient probes are used to detect the magnetic field strength at different locations. By creating a magnetic gradient difference, changes in the magnetic field can be measured more accurately. The magnetic signal conditioning circuit mainly amplifies and filters the weak magnetic signal detected by the magnetic probes. The data acquisition front-end processing circuit converts the analog magnetic signal output from the magnetic signal conditioning circuit into a digital signal for processing and analysis by the MCU main control circuit.

[0021] The MCU main control circuit includes a micro-circular GPS module, which is used to acquire the geographical location information of the magnetic gradient sensor in real time.

[0022] The MCU main control circuit also includes a FLASH storage control circuit, which is used to manage and control the FLASH memory to store the magnetic signal data acquired by the magnetic gradient sensor, the geographical location information acquired by the micro-disc GPS module, and the magnetic field strength threshold for subsequent data analysis.

[0023] The MCU main control circuit also includes an RS485 conversion circuit, which enables long-distance, high-speed data communication between the magnetic detector and other devices. It converts the signal format output by the MCU main control circuit into a signal format that conforms to the RS485 standard, enabling long-distance, high-speed data transmission and interaction between the magnetic induction search device and other devices, and facilitating the transmission of detection data to other devices.

[0024] The MCU main control circuit also includes an audible and visual alarm control circuit, which is used to provide an audible and visual alarm reminder after the MCU main control circuit successfully matches the acquired magnetic field strength data with the preset magnetic field strength threshold.

[0025] The MCU main control circuit also includes an LCD touch screen, which provides a human-machine interface to display the working status of the sensing and searching device, magnetic signal data, and geographical location information obtained by the micro-disc GPS module in real time, so that the searcher can intuitively understand the operating status of the device.

[0026] like Figure 2 As shown, this application also provides a search method for the black box magnetic induction search device as described above, wherein the specific detection and search process is divided into a preprocessing process and a target detection process.

[0027] During the preprocessing process, the magnetic gradient sensor first collects the geomagnetic field strength of the set environmental background and the magnetic field strength of the crash test at different locations in the set environmental background. Based on the geomagnetic field strength and the magnetic field strength of the crash test at different locations, the magnetic field strength threshold is determined and stored in the MCU main control circuit to store data for subsequent actual detection conditions.

[0028] During target detection, the magnetic gradient sensor acquires the magnetic field strength under actual operating conditions. This magnetic field strength is then conditioned and converted from analog to digital, before being sent to the MCU main control circuit for analysis. The MCU compares the acquired magnetic field strength with a threshold database stored during preprocessing. The magnetic field data is displayed in real-time on a screen. Upon successful comparison, an audible and visual alarm is triggered. This method enables rapid location of the black box when traditional positioning methods fail.

[0029] In specific implementation, the principle for determining the magnetic field strength threshold based on the geomagnetic field strength and the magnetic field strength sampled at different crash locations is as follows: the magnetic anomaly caused by the black box is related to the material, size, and volume of the black box. The magnetic field strength induced by the magnetic induction search equipment differs under soil and gravel conditions. The closer the magnetic detection equipment is to the black box, the more obvious the magnetic anomaly is detected. The distance between the detection equipment and the black box was adjusted to 30cm, 40cm, 50cm, 60cm, and 70cm respectively. The relative magnetic field strength measured by the magnetic detection equipment was greater than the geomagnetic field strength, thus determining the distance between the detection equipment and the black box. For example, during the preprocessing of the magnetic detection equipment, the relative magnetic field strength at 70cm between the black box and the magnetic detection equipment was 30.4nt, and the relative magnetic field strength at 60cm between the black box and the magnetic detection equipment was 23.4nt. During actual detection, the relative change in magnetic field strength displayed by the magnetic detection device is between 30.4nt and 23.4nt, indicating that the distance between the black box and the magnetic detection device is between 70cm and 60cm.

[0030] The embodiments of the present invention can achieve precise location and search of the black box at a depth of 0.5m above the ground, solving the problem that the existing technology cannot locate the black box when the aircraft crashes on land, and realizing a fast and effective search for the black box on land.

[0031] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A black box magnetic induction search device, characterized in that, include: The system includes an MCU main control circuit, a data acquisition front-end processing circuit, and a magnetic gradient sensor. The magnetic gradient sensor comprises two magnetic probes for detecting the magnetic field strength at different locations, and the two magnetic probes form a magnetic gradient difference. The magnetic gradient sensor is connected to the input terminal of the data acquisition front-end processing circuit, and the output terminal of the data acquisition front-end processing circuit is connected to the MCU main control circuit. It is used to convert the acquired analog magnetic signals into digital signals and then send them to the MCU main control circuit for analysis and processing. The MCU main control circuit matches the acquired magnetic field strength data with a preset magnetic field strength threshold and determines the location of the black box based on the matching result.

2. The black box magnetic induction search device according to claim 1, characterized in that, The magnetic gradient sensor also includes two magnetic signal conditioning circuits, which are respectively connected to the two magnetic probes and are used to amplify and filter the weak magnetic signals detected by the two magnetic probes.

3. The black box magnetic induction search device according to claim 1, characterized in that, The MCU main control circuit includes a micro-disc GPS module, which is used to acquire the geographical location information of the magnetic gradient sensor in real time.

4. The black box magnetic induction search device according to claim 3, characterized in that, The MCU main control circuit also includes a FLASH storage control circuit, which is used to manage and control the FLASH memory to store the magnetic signal data acquired by the magnetic gradient sensor, the geographical location information acquired by the micro-disc GPS module, and the magnetic field strength threshold.

5. The black box magnetic induction search device according to claim 3, characterized in that, The MCU main control circuit also includes an RS485 conversion circuit, which converts the signal format output by the MCU main control circuit into a signal format that conforms to the RS485 standard, so as to realize long-distance, high-speed data transmission and interaction between the magnetic induction search device and other devices.

6. The black box magnetic induction search device according to claim 3, characterized in that, The MCU main control circuit also includes an audible and visual alarm control circuit, which is used to provide an audible and visual alarm reminder after the MCU main control circuit successfully matches the acquired magnetic field strength data with the preset magnetic field strength threshold.

7. The black box magnetic induction search device according to claim 3, characterized in that, The MCU main control circuit also includes an LCD touch screen, which provides a human-machine interface to display the working status of the sensing and searching device, magnetic signal data, and geographical location information acquired by the micro-disc GPS module in real time.

8. A search method for a black box magnetic induction search device as described in any one of claims 1 to 7, characterized in that, include: The magnetic gradient sensor collects the geomagnetic field strength of a set environmental background and the magnetic field strength of a crash test at different locations in the set environmental background. Based on the geomagnetic field strength and the magnetic field strength of the crash test at different locations, a magnetic field strength threshold is determined and stored in the MCU main control circuit. The magnetic field strength under actual working conditions is acquired by the magnetic gradient sensor, the magnetic field strength under actual working conditions is conditioned, and the conditioned analog magnetic signal is converted into a digital signal and sent to the MCU main control circuit for analysis and processing. The MCU main control circuit matches the acquired magnetic field strength under actual working conditions with a preset magnetic field strength threshold, and determines the location of the black box based on the matching result.

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