A magnetic effect security pre-test system, method and medium

Abstract

The application relates to a magnetic effect safety pretest system, a method and a medium, and relates to the technical field of airborne equipment airworthiness testing.The magnetic effect safety pretest system comprises a magnetic field monitoring module, which is used for detecting three-axis magnetic field components of an airborne equipment to be tested, capturing three-axis magnetic flux, and converting the three-axis magnetic flux into local magnetic field data; an attitude positioning module, a magnetic field calibration module and a global main control module, which are used for generating attitude deflection adjustment instructions according to a test mode type in combination with test pose coordinates, generating magnetic field calibration instructions in combination with reverse magnetic field data, and distributing the magnetic field calibration instructions to corresponding modules; and an anti-interference protection module.Through full automation of a test process, manual intervention is not needed, human errors are effectively eliminated, the test efficiency is improved, three-dimensional magnetic field scanning is supported, and the magnetic radiation characteristics of the equipment can be comprehensively evaluated.Through triple anti-interference protection design, the influence of external magnetic fields and electromagnetic interference is greatly reduced, the stability of test data is improved, and the system has strong universality and expansibility.

Description

Technical Field

[0001] This application relates to the field of airborne equipment airworthiness testing technology, and in particular to a magnetic effect safety pre-testing system, method and medium. Background Technology

[0002] The static magnetic field generated by airborne equipment during operation can easily cause orientation deviations in magnetic compasses, magnetic flux gates, and other magnetic orientation sensors, severely affecting flight navigation accuracy. Magnetic effect testing is necessary to determine the equipment installation category and minimum safe distance to ensure that magnetic deflection deviation does not exceed the standard threshold. The testing environment lacks effective anti-interference design, and external magnetic field interference leads to excessive deviations in test data, failing to meet the stringent requirements of airworthiness certification.

[0003] Existing patents disclose a fully automated point-measurement system and method for measuring the magnetic field distribution of accelerator magnets, comprising: a marble point-measurement air-float platform, a magnet testing platform, and a data acquisition system. The marble point-measurement air-float platform serves as a transmission platform, used under the control of the data acquisition system to move a Hall probe mounted on the platform. This allows the Hall probe to detect the magnetic field distribution of the magnet under test mounted on the magnet testing platform and transmit the data to the data acquisition system. The data acquisition system collects and controls the measurement position of the Hall probe, and simultaneously collects real-time data on the induction coil current and voltage of the magnet under test. By evaluating the magnitude of the disturbance to the magnetic field caused by the current and voltage data, the accuracy of the magnetic field detection is determined, and magnetic field corrections are performed. This invention can be widely applied in the field of magnet magnetic field testing.

[0004] The existing technical solutions mentioned above have the following drawbacks: 1. The measurement accuracy of the existing test system is insufficient. The resolution of traditional magnetic sensors can only reach 0.1μT, which makes it difficult to capture weak magnetic deflection signals, resulting in excessive errors in the determination of equipment installation categories; 2. The test process relies on manual operation, which requires manual adjustment of the distance and angle between the device under test (EUT) and the sensor. This is not only inefficient, but also prone to introducing human error. Furthermore, it cannot achieve three-dimensional scanning of the magnetic field distribution, making it difficult to comprehensively evaluate the magnetic radiation characteristics of the equipment. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this application is to provide a magnetic effect safety pre-testing system, method, and medium. By achieving full automation of the testing process without manual intervention, testing efficiency is improved. It also supports three-dimensional magnetic field scanning, which can comprehensively evaluate the magnetic radiation characteristics of the equipment and effectively eliminate human error. The triple anti-interference protection design significantly reduces the influence of external magnetic fields and electromagnetic interference, improves the stability of test data, and has strong versatility and scalability.

[0006] This was achieved using the following technical solutions: In a first aspect, this application provides a magnetic effect safety pre-testing system, comprising: The magnetic field monitoring module is used to detect the three-axis magnetic field components of the airborne equipment under test, capture the three-axis magnetic flux, and convert it into local magnetic field data. The attitude positioning module is used to locate and correct the magnetic deflection attitude coordinates of the airborne equipment under test based on the dynamic monitoring range of the magnetic field and the preset standard test attitude. The magnetic field calibration module is used to calculate the reverse magnetic field data and calibrate the local magnetic field data based on the preset reference magnetic field data and the magnetic field data of the test environment. The global master control module is used to generate attitude deflection adjustment commands based on the test mode type and test pose coordinates, and at the same time, generate magnetic field calibration commands based on the reverse magnetic field data, and distribute them to the corresponding modules. The anti-interference protection module is used to suppress external magnetic fields and electromagnetic interference of the airborne equipment under test in the test environment, including the shielding cavity and the grounding copper busbar.

[0007] By adopting the above technical solution, magnetic field vector decomposition is achieved by integrating triaxial magnetic flux detection and Kalman filtering algorithm, magnetic deflection attitude is corrected by coordinate transformation, and environmental interference is eliminated by using reverse magnetic field compensation. Combined with shielding cavity and grounding copper busbar to suppress external electromagnetic disturbances, the magnetic field measurement accuracy and system reliability of airborne equipment in complex electromagnetic environment are significantly improved.

[0008] Furthermore, the magnetic field monitoring module includes: The magnetic flux detection unit is used to detect the three-axis magnetic field components of the airborne equipment under test according to the preset magnetic field measurement range, and capture the three-axis magnetic flux. The data acquisition unit is used to acquire triaxial magnetic flux according to a preset sampling frequency to obtain local magnetic field signals; The signal conditioning unit is used to filter and denoise the local magnetic field signal and perform analog-to-digital conversion based on the acquisition timestamp to obtain local magnetic field data.

[0009] By adopting the above technical solution, the triaxial magnetic flux is captured by a preset measurement interval, data is collected by combining the sampling frequency, and local magnetic field data is generated by using filtering and noise reduction and analog-to-digital conversion algorithms, thus realizing high-precision and low-noise magnetic field monitoring.

[0010] Furthermore, the attitude localization module includes: The pose detection unit is used to detect the attitude of the airborne equipment under test according to the dynamic monitoring range of the magnetic field and determine the relative pose of the equipment. The deviation calculation unit is used to perform attitude positioning of the device relative pose according to the preset standard test posture and calculate the pose deviation parameters. The attitude correction unit is used to correct the attitude of the airborne equipment under test according to the attitude deflection adjustment command and attitude deviation parameters, so as to obtain the magnetic deflection attitude coordinates.

[0011] By adopting the above technical solution, based on the relative pose of the magnetic field dynamic interval detection device, the pose deviation is calculated using a closed-loop control algorithm and a correction command is generated, thereby achieving accurate positioning and dynamic compensation of the magnetic deflection attitude of the airborne equipment under test, which significantly improves the accuracy of attitude measurement and system response speed.

[0012] Furthermore, the magnetic field calibration module includes: The magnetic field generating unit is used to generate and output a reference test magnetic field and calculate the reference magnetic field data based on preset reference magnetic field data. The interference quantization unit is used to detect the magnetic field of the test environment, collect real-time test magnetic field data, and calculate the reverse magnetic field data by combining it with the reference magnetic field data. The calibration compensation unit is used to compensate for local magnetic field data based on magnetic field calibration instructions and reverse magnetic field data, so as to maintain the reference test magnetic field.

[0013] By adopting the above technical solution, the reference magnetic field is accurately output through the magnetic field generating unit, and the interference is canceled in real time by using the environmental magnetic field acquisition and reverse compensation algorithm. This achieves high-precision dynamic calibration of local magnetic field data and improves the accuracy and stability of airborne equipment magnetic field testing in complex electromagnetic environments.

[0014] Furthermore, the global main control module includes: The device parsing unit is used to parse the correction actuator to obtain the mechanism communication protocol and mechanism function identifier; The data acquisition unit is used to receive local magnetic field data and pose deviation parameters based on timestamps and communication interfaces, and to build an airborne equipment data pool. The data cleaning unit is used to filter, denoise, and sort the equipment test data pairs in the airborne equipment data pool according to the data type to obtain time-series test data pairs. The task parsing unit is used to parse the equipment test task and extract the target magnetic field data and target test pose; The parameter fusion unit is used to perform vector decomposition on the reference magnetic field data and the target magnetic field data to obtain reference azimuth data and target azimuth data in different directions. If any target azimuth data is greater than the reference azimuth data, the reference azimuth data is corrected based on the current target azimuth data to generate an azimuth compensation vector; The standard test pose and the target test pose are analyzed to obtain the standard key position coordinates and the target key position coordinates, and the pose coordinate difference is calculated. If the pose coordinate difference is not within the preset attitude tolerance range, the pose coordinate difference is decomposed according to the global coordinate system to obtain the pose orientation vector difference. The simulation correction unit is used to correct and evolve the timing test data based on the reverse magnetic field data and the pose deviation parameters, and to calculate the magnetic field compliance and pose conformity. If either of them is less than the corresponding threshold, a magnetic field correction factor is generated based on the magnetic field compliance and magnetic interference factor, and the orientation compensation vector is corrected to obtain the orientation time sequence vector. And / or generate a pose correction factor based on the pose compliance and the mechanism wear factor, and correct the pose orientation vector difference to obtain the pose timing vector. The pattern calibration unit is used to bind the orientation timing vector and pose timing vector according to the mechanism function identifier to generate a unique test pattern. The command conversion unit is used to generate attitude deflection adjustment commands and magnetic field calibration commands based on the dedicated test mode and the mechanism communication protocol. The collaborative distribution unit is used to distribute attitude deflection adjustment commands and magnetic field calibration commands to the corresponding modules according to the test timing.

[0015] By adopting the above technical solution, based on vector decomposition and closed-loop compensation algorithms, and integrating the target magnetic field, reference magnetic field, and attitude deviation, attitude deflection and magnetic field calibration commands are dynamically generated through compliance evaluation and correction factor calculation. This achieves coordinated dual closed-loop precise control of the airborne equipment testing process, significantly improving the accuracy of coordinated control of magnetic field and attitude, testing efficiency, and system adaptability.

[0016] Secondly, this application also provides a magnetic effect safety pre-testing method, which adopts the following technical solution; A method for safe pre-testing of magnetic effects includes: The three-axis magnetic field components of the airborne equipment under test are detected, the three-axis magnetic flux is captured, and converted into local magnetic field data. Based on the dynamic monitoring range of the magnetic field and the preset standard test attitude, the magnetic deflection attitude coordinates of the airborne equipment under test are located and corrected. Based on the preset reference magnetic field data and the test environment magnetic field data, calculate the reverse magnetic field data and calibrate the local magnetic field data. Based on the test mode type and test deviation data, attitude deflection adjustment commands and magnetic field calibration commands are generated and distributed to the corresponding modules, while suppressing external magnetic fields and electromagnetic interference of the airborne equipment under test in the test environment.

[0017] By adopting the above technical solution, local magnetic field data is obtained through triaxial magnetic flux detection and vector decomposition. The magnetic deflection attitude and environmental interference are dynamically corrected by coordinate transformation and reverse magnetic field compensation algorithm. Combined with pattern recognition, dual closed-loop commands (attitude deflection adjustment and magnetic field calibration) are generated, which improves the magnetic field measurement accuracy, attitude positioning reliability and test automation level of airborne equipment in complex electromagnetic environments.

[0018] Thirdly, this application also provides a storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, at least one program, code set, or instruction set is loaded and executed by a processor to implement the magnetic effect safety pre-testing method as described above.

[0019] In summary, the beneficial technical effects of this application are as follows: Based on vector decomposition and closed-loop compensation algorithms, the target magnetic field, reference magnetic field and attitude deviation are integrated. Through compliance assessment and correction factor calculation, attitude deflection and magnetic field calibration commands are dynamically generated, realizing coordinated dual closed-loop precise control of airborne equipment testing process, and significantly improving the coordinated control accuracy of magnetic field and attitude. Local magnetic field data is obtained by triaxial magnetic flux detection and vector decomposition. The magnetic deflection attitude and environmental interference are dynamically corrected by coordinate transformation and reverse magnetic field compensation algorithm. Combined with pattern recognition, dual closed-loop commands (attitude deflection adjustment and magnetic field calibration) are generated, which improves the magnetic field measurement accuracy and attitude positioning reliability of airborne equipment in complex electromagnetic environments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the magnetic effect safety pre-testing system in this application; Figure 2 This is a physical connection diagram of the pre-testing system in this application; Figure 3 This is a schematic diagram of the global main control module in this application; Figure 4 This is a flowchart illustrating the magnetic effect safety pre-testing method in this application. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] Firstly, this application discloses a magnetic effect safety pre-testing system, comprising: The magnetic field monitoring module is used to detect the three-axis magnetic field components of the airborne equipment under test, capture the three-axis magnetic flux, and convert it into local magnetic field data. The attitude positioning module is used to locate and correct the magnetic deflection attitude coordinates of the airborne equipment under test based on the dynamic monitoring range of the magnetic field and the preset standard test attitude. The magnetic field calibration module is used to calculate the reverse magnetic field data and calibrate the local magnetic field data based on the preset reference magnetic field data and the magnetic field data of the test environment. The global master control module is used to generate attitude deflection adjustment commands based on the test mode type and test pose coordinates, and at the same time, generate magnetic field calibration commands based on the reverse magnetic field data, and distribute them to the corresponding modules. The anti-interference protection module is used to suppress external magnetic fields and electromagnetic interference of the airborne equipment under test in the test environment, including the shielding cavity and the grounding copper busbar.

[0023] In this embodiment, refer to Figures 1-2 The magnetic field monitoring module is responsible for the precise acquisition of magnetic deflection signals and three-dimensional magnetic field distribution data. Its core components include a three-dimensional fluxgate sensor, a high-speed data acquisition board, and a signal conditioning unit. The three-dimensional fluxgate sensor is the Bartington Mag-03 model, with a magnetic field measurement range of ±100μT, a resolution of up to 0.1nT, and a linearity ≤1 / 10000. It can simultaneously acquire X, Y, and Z-axis magnetic field components, accurately capturing the weak magnetic deflection signals generated by the EUT. It is equipped with a miniature Hall probe, with a minimum size of only 0.7mm, capable of penetrating deep into equipment gaps to acquire local magnetic field data. The high-speed data acquisition board uses the FDU301 three-channel acquisition unit, equipped with a 24-bit ADC converter, a sampling rate of up to 1600ksps, and a digital output rate adjustable between 1sps and 1ksps. It can convert the sensor's analog signals into digital signals at high speed, with a dynamic range of 145dB, ensuring the integrity and accuracy of data acquisition. The signal conditioning unit has a built-in low-pass filter circuit and gain adjustment unit. The filter cutoff frequency can be programmably adjusted between 10Hz and 1kHz, and the gain adjustment range is 0-60dB, effectively filtering out high-frequency noise and amplifying weak magnetic signals.

[0024] The attitude positioning module enables precise control of the relative position between the EUT and the three-channel acquisition unit, supporting three-dimensional magnetic field scanning and multi-attitude testing. It consists of a five-dimensional CNC micro-motion platform and an attitude adjustment mechanism. The five-dimensional CNC micro-motion platform includes X, Y, and Z-axis translation mechanisms and a two-axis rotation mechanism. The translation stroke covers 4000mm × 2000mm × 2000mm, with a positioning accuracy of 0.01mm and a repeatability of <0.005mm. The rotation mechanism has an angular resolution of <0.0002° and a positioning accuracy of 0.01°, enabling continuous 360° rotation of the EUT around the vertical and horizontal axes, ensuring the EUT aligns with the sensor at maximum magnetic deflection. The attitude adjustment mechanism is linked to the main control unit and can preset 12 standard test attitudes, covering typical installation angles of the EUT on aircraft. It also supports user-defined attitude parameters to meet the testing needs of different equipment. The platform's movement speed is adjustable in 2-64 levels, enabling both rapid positioning and low-speed stepping during magnetic field scanning to ensure data acquisition density, with a minimum scanning step size of 0.001mm.

[0025] The magnetic field calibration module provides a standard magnetic field reference for testing, ensuring measurement accuracy. It consists of a standard magnetic field generator, a calibration coil, and a compensation magnetic field unit. The standard magnetic field generator uses the TM4300B calibration kit and can generate a uniform DC magnetic field of 0-50μT with a magnetic field uniformity error ≤±1%, meeting the requirements for the test magnetic field. The calibration coil uses a 12cm diameter, 20-turn toroidal structure, operating at a frequency of 25Hz-100kHz. It generates a traceable standard magnetic field through current adjustment for periodic sensor calibration. The compensation magnetic field unit incorporates a digital compensation field generator with a range of -131072nT to +130048nT and a step accuracy of 5×10⁻⁻⁻⁶. 4 The system operates at full scale and can monitor the magnetic field of the test environment in real time. External interference is offset by reverse magnetic field compensation, ensuring the horizontal component of the geomagnetic force in the test area remains stable within the standard range of 14.4 A / m ± 10%. The calibration process is automatically controlled by the global main control module. Sensor calibration is completed using a three-point calibration method before testing, and the calibration cycle can be freely set to ensure long-term measurement accuracy.

[0026] The anti-interference protection module suppresses external magnetic fields and electromagnetic interference, ensuring the reliability of test data. It adopts a triple protection design of "shielding isolation + magnetic field compensation + grounding optimization". The main body of the system is installed in a non-magnetic shielded cavity. The cavity adopts a composite structure of superconducting niobium material and high magnetic permeability alloy, utilizing the Meissner effect to achieve weak magnetic field shielding. The shielding effectiveness is ≥80dB (10Hz-100kHz frequency band), effectively blocking external environmental magnetic field interference. The inner wall of the shielded cavity is covered with an electromagnetic shielding coating, and the cavity joints are sealed with conductive gaskets to prevent magnetic field leakage and external interference penetration. All equipment metal shells are connected through equipotential copper busbars, adopting a single-point grounding design with a grounding resistance ≤4Ω to eliminate interference caused by potential differences between equipment. The signal cables are twisted-pair shielded cables with a shielding layer coverage of ≥90%. The horizontal distance from power lines is ≥1.5m, and when crossing, they are perpendicularly crossed at 90° to reduce electromagnetic coupling interference.

[0027] The global main control module uses an industrial control computer (i7 processor or higher, ≥16GB memory, ≥4TB hard drive) and integrates dedicated test control software to achieve coordinated control and data processing of various units. The control software has a built-in complete test process and equipment classification standards (Y / Z / A / B / C categories), supporting two test modes: a rapid judgment mode that automatically completes the maximum magnetic deflection attitude test of the EUT and outputs the minimum safe distance and installation category within 5 minutes; and a 3D scanning mode that completes a 3D scan of the magnetic field around the EUT according to a preset path, generating visual data such as a 3D magnetic field distribution map and vector map. The software has real-time data display, storage, and analysis functions, automatically calculating key parameters such as magnetic deflection angle and peak magnetic field strength. It determines the test results based on the standard threshold of 14.4A / m±10% geomagnetic horizontal component force, automatically generating a standardized report containing test parameters, waveforms, installation category, and minimum safe distance, and supports data export and printing.

[0028] Preferably, the magnetic field monitoring module includes: The magnetic flux detection unit is used to detect the three-axis magnetic field components of the airborne equipment under test according to the preset magnetic field measurement range, and capture the three-axis magnetic flux. The data acquisition unit is used to acquire triaxial magnetic flux according to a preset sampling frequency to obtain local magnetic field signals; The signal conditioning unit is used to filter and denoise the local magnetic field signal and perform analog-to-digital conversion based on the acquisition timestamp to obtain local magnetic field data.

[0029] In this embodiment, in an avionics electronic equipment electromagnetic compatibility pre-test laboratory, to evaluate the magnetic interference characteristics of a switching power supply module installed near an airborne radio compass, the magnetic field monitoring module first uses a magnetic flux detection unit to measure the magnetic field within a set ±100μT range, specifically the Bartington magnetic field. The Mag-03 three-dimensional fluxgate sensor is fixed 5cm away from the power module, synchronously capturing the X, Y, and Z-axis magnetic flux during operation, and accurately acquiring the weak magnetic deflection signal caused by the switching frequency. The data acquisition unit then performs high-speed digitization of the three-axis signal at a preset sampling rate of 1kHz (the digital output rate of the FDU301 board is set to 1ksps). The analog voltage is converted into a local magnetic field signal using a 24-bit ADC converter, and a miniature Hall probe (0.7mm in size) is inserted into the gap between the power module and the chassis to collect near-field leakage data. The signal conditioning unit aligns the data of each channel according to the acquisition timestamp. First, the low-pass filter circuit (the cutoff frequency is programmably set to 500Hz) is activated to filter out power frequency harmonic interference from peripheral equipment. Then, the weak signal is amplified by 40dB through the gain adjustment unit. Finally, the filtered, amplified, and analog-to-digital converted local magnetic field data is output to construct a three-dimensional magnetic field distribution map of the power module and determine its safe installation distance from the compass.

[0030] Preferably, the attitude positioning module includes: The pose detection unit is used to detect the attitude of the airborne equipment under test according to the dynamic monitoring range of the magnetic field and determine the relative pose of the equipment. The deviation calculation unit is used to perform attitude positioning of the device relative pose according to the preset standard test posture and calculate the pose deviation parameters. The attitude correction unit is used to correct the attitude of the airborne equipment under test according to the attitude deflection adjustment command and attitude deviation parameters, so as to obtain the magnetic deflection attitude coordinates.

[0031] In this embodiment, in an avionics electronic equipment electromagnetic compatibility testing laboratory, in order to evaluate the interference characteristics of airborne communication equipment on the magnetic compass at different installation angles, the attitude positioning module first uses the attitude detection unit to perform real-time attitude detection on the EUT fixed on the five-dimensional CNC micro-motion platform according to the magnetic field dynamic monitoring range (±100μT). The platform's built-in grating ruler and angle encoder determine the current relative attitude of the equipment (such as translation coordinates X=1500mm, Y=800mm, Z=600mm, pitch angle 5°, azimuth angle 30°). The deviation calculation unit compares the current attitude with one of the 12 preset standard test attitudes (such as "cruising horizontal attitude": X=1500mm, Y=800mm, Z=600mm, pitch angle 0°, azimuth angle 45°) axis by axis to calculate the attitude deviation parameters (ΔX=0mm, ΔY=0mm, ΔZ=0mm, pitch angle +5°, azimuth angle -15°).

[0032] Subsequently, the pose correction unit, based on the attitude deflection adjustment command issued by the main control unit and combined with the pose deviation parameters, drives the five-dimensional CNC micro-motion platform: First, the EUT is rotated 5° in the positive direction around the horizontal axis with an angular resolution of 0.0002° through a two-axis rotation mechanism to eliminate pitch deviation, and then rotated 15° in the negative direction around the vertical axis to adjust the azimuth angle from 30° to 45°. At the same time, the three-axis translation mechanism is linked to fine-tune the spatial position with a positioning accuracy of 0.01mm (no actual movement is required). Finally, the EUT is accurately aligned with the three-channel acquisition unit in the preset "cruising horizontal attitude" to obtain the magnetic deflection attitude coordinates (X=1500mm, Y=800mm, Z=600mm, pitch angle 0°, azimuth angle 45°). In the subsequent magnetic field scanning, the platform moves layer by layer along the Z-axis at a low speed (minimum step size 0.001mm) to ensure that the fluxgate sensor can continuously capture the magnetic deflection signal within each micrometer interval, thereby completely constructing a three-dimensional magnetic field distribution map of the EUT in the direction of maximum magnetic interference.

[0033] Preferably, the magnetic field calibration module includes: The magnetic field generating unit is used to generate and output a reference test magnetic field and calculate the reference magnetic field data based on preset reference magnetic field data. The interference quantization unit is used to detect the magnetic field of the test environment, collect real-time test magnetic field data, and calculate the reverse magnetic field data by combining it with the reference magnetic field data. The calibration compensation unit is used to compensate for local magnetic field data based on magnetic field calibration instructions and reverse magnetic field data, so as to maintain the reference test magnetic field.

[0034] In this embodiment: In a certain avionics equipment magnetic effect safety pre-test laboratory, in order to eliminate the influence of environmental geomagnetic fluctuations on the magnetic interference measurement of equipment near the airborne compass, the magnetic field calibration module first starts the TM4300B standard magnetic field generator based on the preset reference magnetic field data (e.g., the horizontal component of the geomagnetic field of 14.4 A / m corresponds to about 18 μT). The generator generates a traceable uniform DC reference test magnetic field in the range of 0-50 μT (e.g., set to 20 μT) through a ring calibration coil with a diameter of 12 cm and 20 turns. The actual output value is calculated and the deviation from the set value is calculated using the built-in fluxgate feedback, and the reference magnetic field data is accurately recorded. Subsequently, the interference quantification unit detects the environmental magnetic field in real time through three-dimensional fluxgate sensors deployed around the test area, and collects real-time test magnetic field data including geomagnetism, surrounding equipment and building steel bars (e.g., the current environmental magnetic field is 23 μT). The difference is calculated with the reference magnetic field data (20 μT) to calculate the reverse magnetic field data (-3 μT) that needs to be canceled.

[0035] The calibration and compensation unit, based on the magnetic field calibration command issued by the global main control module, drives the digital compensation field generator of the compensation magnetic field unit, with a range of ±131072nT, at a frequency of 5×10⁻4 The full-scale step-accuracy output reverse magnetic field (-3μT) is used to compensate for environmental interference in real time through a compensation coil, so that the actual synthetic magnetic field in the test area is stabilized within the reference value of 20μT±2%. The entire calibration process adopts a three-point calibration method (taking three calibration points of 0μT, 25μT, and 50μT respectively) and is automatically executed every 8 hours. After the linearity correction of the sensor is completed, the system enters the formal testing stage. At this time, any external magnetic field fluctuations will be quickly detected and compensated in reverse, ensuring that the local magnetic field data collected by the subsequent attitude positioning module is in a constant reference test magnetic field background, thereby obtaining high-precision and repeatable EUT magnetic deflection characteristic measurement results.

[0036] Preferably, refer to Figure 3 The global main control module includes: The device parsing unit is used to parse the correction actuator to obtain the mechanism communication protocol and mechanism function identifier; The data acquisition unit is used to receive local magnetic field data and pose deviation parameters based on timestamps and communication interfaces, and to build an airborne equipment data pool. The data cleaning unit is used to filter, denoise, and sort the equipment test data pairs in the airborne equipment data pool according to the data type to obtain time-series test data pairs. The task parsing unit is used to parse the equipment test task and extract the target magnetic field data and target test pose; The parameter fusion unit is used to perform vector decomposition on the reference magnetic field data and the target magnetic field data to obtain reference azimuth data and target azimuth data in different directions. If any target azimuth data is greater than the reference azimuth data, the reference azimuth data is corrected based on the current target azimuth data to generate an azimuth compensation vector; The standard test pose and the target test pose are analyzed to obtain the standard key position coordinates and the target key position coordinates, and the pose coordinate difference is calculated. If the pose coordinate difference is not within the preset attitude tolerance range, the pose coordinate difference is decomposed according to the global coordinate system to obtain the pose orientation vector difference. The simulation correction unit is used to correct and evolve the timing test data based on the reverse magnetic field data and the pose deviation parameters, and to calculate the magnetic field compliance and pose conformity. If either of them is less than the corresponding threshold, a magnetic field correction factor is generated based on the magnetic field compliance and magnetic interference factor, and the orientation compensation vector is corrected to obtain the orientation time sequence vector. And / or generate a pose correction factor based on the pose compliance and the mechanism wear factor, and correct the pose orientation vector difference to obtain the pose timing vector. The pattern calibration unit is used to bind the orientation timing vector and pose timing vector according to the mechanism function identifier to generate a unique test pattern. The command conversion unit is used to generate attitude deflection adjustment commands and magnetic field calibration commands based on the dedicated test mode and the mechanism communication protocol. The collaborative distribution unit is used to distribute attitude deflection adjustment commands and magnetic field calibration commands to the corresponding modules according to the test timing.

[0037] In this embodiment, during the magnetic effect safety pre-test of a certain avionics equipment, the global main control module first uses the equipment analysis unit to analyze the correction actuators such as the five-dimensional CNC micro-motion platform, the three-dimensional fluxgate sensor, and the standard magnetic field generator to obtain their EtherCAT communication protocol and mechanism function identifiers (such as "platform_rotation axis" and "sensor_three-axis flux"). The data acquisition unit receives local magnetic field data (from the magnetic field monitoring module) and attitude deviation parameters (from the attitude positioning module) in real time based on microsecond-level timestamps and USB / Ethernet interfaces, constructing an airborne equipment data pool. The data cleaning unit performs low-pass filtering to denoise the equipment test data pairs (such as [time, magnetic field value, deviation angle]) in the data pool and arranges them in descending order of time to generate time-series test data pairs. The task analysis unit extracts the test task data. The target magnetic field data (e.g., 18μT equivalent compass interference threshold) and the target test pose (e.g., "cruising horizontal attitude") are used. The parameter fusion unit performs vector decomposition on the reference magnetic field data (20μT) and the target magnetic field data to obtain the X / Y / Z reference azimuth data (e.g., 20,0,0) and the target azimuth data (18,0,0). Since the target X-axis 18μT is less than the reference 20μT, there is no need to generate an azimuth compensation vector. At the same time, the standard test pose (pitch 0°, azimuth 45°) and the current target test pose (pitch 0°, azimuth 30°) are analyzed to obtain the standard key position coordinates and the target key position coordinates. The pose coordinate difference (azimuth angle difference 15°) is calculated. This difference exceeds the preset attitude tolerance range (±0.01°). Therefore, the pose azimuth vector difference (Δψ=15°) is obtained by decomposing the global coordinate system. The simulation correction unit combines the current reverse magnetic field data (-3μT) with the pose deviation parameters to correct and evolve the time-series test data, and calculates the magnetic field compliance (the ratio of actual 23μT to target 18μT is 1.28, compliance is 78%) and pose compliance (the ratio of actual difference 15° to tolerance 0.01° is 1500, compliance is 0%), both of which are less than the threshold.

[0038] Based on the magnetic field compliance and magnetic interference factor (e.g., geomagnetic fluctuation rate 1.2), a magnetic field correction factor of 0.95 is generated, and the orientation compensation vector (currently 0) is corrected to obtain the orientation time sequence vector (0); based on the pose compliance and mechanism wear factor (e.g., platform repeatability accuracy attenuation 0.002° / year), a pose correction factor of 1.002 is generated, and the pose orientation vector difference (15°) is corrected to 15.03° to obtain the pose time sequence vector. The mode calibration unit binds the azimuth time-series vector and the pose time-series vector according to the mechanism's functional identifier, generating a dedicated "3D scan-fine-tuning" test mode. The command conversion unit generates an attitude deflection adjustment command (turning the azimuth angle from 30° to 45.03°) and a magnetic field calibration command (dynamic compensation -3.15μT) based on this mode and the mechanism's communication protocol. The collaborative distribution unit distributes the commands to the attitude positioning module and the magnetic field calibration module according to the test sequence (adjusting the attitude first, then calibrating the magnetic field, and finally collecting data), ultimately completing the 3D magnetic deflection scan of the EUT at an azimuth angle of 15.03° under a compensated magnetic field background, and automatically outputting the minimum safe distance and installation category determination.

[0039] In this embodiment, in a magnetic effect testing laboratory for avionics equipment, the anti-interference protection module first installs the EUT and all test equipment in a shielded cavity (shielding effectiveness ≥80dB@10Hz-100kHz) composed of superconducting niobium and high permeability alloy composite. The Meissner effect and electromagnetic shielding coating effectively suppress external power frequency and radio frequency interference. All equipment metal shells are grounded to a grounding grid with a resistance ≤4Ω through equipotential copper busbars at a single point to eliminate potential differences. The signal cables use twisted-pair cables with a shielding coverage of ≥90% throughout, maintaining a distance of ≥1.5m from power lines and being laid perpendicularly to each other. This controls the environmental magnetic field fluctuation within 14.4A / m±1%, ensuring the purity and repeatability of the magnetic deflection signal acquisition.

[0040] Reference Figure 4 This application discloses a magnetic effect safety pre-testing method, comprising: S1: Detect the three-axis magnetic field components of the airborne equipment under test, capture the three-axis magnetic flux, and convert it into local magnetic field data; S2: Based on the dynamic monitoring range of the magnetic field and the preset standard test attitude, locate and correct the magnetic deflection attitude coordinates of the airborne equipment under test; S3: Calculate the reverse magnetic field data and calibrate the local magnetic field data based on the preset reference magnetic field data and the test environment magnetic field data; S4: Based on the test mode type and test deviation data, generate attitude deflection adjustment commands and magnetic field calibration commands, distribute them to the corresponding modules, and suppress the external magnetic field and electromagnetic interference of the airborne equipment under test in the test environment.

[0041] In this embodiment: In the magnetic effect safety pre-test of a certain avionics equipment, the three-axis magnetic field components of the airborne equipment under test (EUT) installed on the five-dimensional platform are first detected. The magnetic flux in the X, Y, and Z directions is captured synchronously by the Bartington Mag-03 fluxgate sensor. After high-speed sampling and signal conditioning by a 24-bit ADC, it is converted into local magnetic field data. According to 12 preset standard test attitudes (such as "cruising horizontal attitude"), the magnetic deflection attitude coordinates of the EUT are located and corrected in real time using a five-dimensional numerical control micro-motion platform (positioning accuracy 0.01mm, angular resolution 0.0002°) to ensure that it is aligned with the sensor in the direction of maximum magnetic interference.

[0042] A 20μT reference magnetic field is generated using a TM4300B standard magnetic field generator. The ambient magnetic field (e.g., 23μT) is acquired in real time, and the reverse magnetic field (-3μT) is calculated for dynamic compensation to calibrate the local magnetic field data to the reference background. Based on the user-selected "Quick Judgment Mode" or "3D Scan Mode", combined with the pose and magnetic field deviation data generated during the test, attitude deflection adjustment commands and magnetic field calibration commands are automatically generated and distributed to the attitude positioning module and magnetic field calibration module via EtherCAT bus. At the same time, through measures such as shielding cavity (shielding effectiveness ≥80dB), single-point grounding (grounding resistance ≤4Ω) and twisted-pair shielded cable, external electromagnetic interference is effectively suppressed to ensure that the entire test process is completed in a stable magnetic field environment. Finally, the minimum safe distance and installation category of the EUT are output.

[0043] This application discloses a storage medium storing at least one instruction, at least one program, code set, or instruction set, wherein the at least one instruction, at least one program, code set, or instruction set is loaded and executed by a processor to implement the magnetic effect safety pre-testing method as described above.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A magnetic effect safety pre-testing system, characterized in that, include: The magnetic field monitoring module is used to detect the three-axis magnetic field components of the airborne equipment under test, capture the three-axis magnetic flux, and convert it into local magnetic field data. The attitude positioning module is used to locate and correct the magnetic deflection attitude coordinates of the airborne equipment under test based on the dynamic monitoring range of the magnetic field and the preset standard test attitude. The magnetic field calibration module is used to calculate the reverse magnetic field data and calibrate the local magnetic field data based on the preset reference magnetic field data and the magnetic field data of the test environment. The global master control module is used to generate attitude deflection adjustment commands based on the test mode type and the test pose coordinates, and at the same time, generate magnetic field calibration commands based on the reverse magnetic field data, and distribute them to the corresponding modules.

2. The magnetic effect safety pre-testing system according to claim 1, characterized in that, The magnetic field monitoring module includes: The magnetic flux detection unit is used to detect the three-axis magnetic field components of the airborne equipment under test according to the preset magnetic field measurement range, and capture the three-axis magnetic flux. The data acquisition unit is used to acquire the triaxial magnetic flux according to a preset sampling frequency to obtain a local magnetic field signal; The signal conditioning unit is used to filter and denoise the local magnetic field signal and perform analog-to-digital conversion based on the acquisition timestamp to obtain local magnetic field data.

3. The magnetic effect safety pre-testing system according to claim 1, characterized in that, The attitude positioning module includes: The pose detection unit is used to detect the attitude of the airborne equipment under test according to the dynamic monitoring range of the magnetic field and determine the relative pose of the equipment. The deviation calculation unit is used to perform attitude positioning of the relative pose of the device according to the preset standard test posture and calculate the pose deviation parameters. The pose correction unit is used to correct the pose of the airborne equipment under test according to the attitude deflection adjustment command and the pose deviation parameters, so as to obtain the magnetic deflection attitude coordinates.

4. The magnetic effect safety pre-testing system according to claim 1, characterized in that, The magnetic field calibration module includes: The magnetic field generating unit is used to generate and output a reference test magnetic field and calculate the reference magnetic field data based on preset reference magnetic field data. The interference quantization unit is used to detect the magnetic field of the test environment, collect real-time test magnetic field data, and calculate the reverse magnetic field data by combining the reference magnetic field data. The calibration compensation unit is used to compensate for the local magnetic field data according to the magnetic field calibration command and the reverse magnetic field data, so as to maintain the reference test magnetic field.

5. The magnetic effect safety pre-testing system according to claim 1, characterized in that, The global master control module includes: The device parsing unit is used to parse the correction actuator to obtain the mechanism communication protocol and mechanism function identifier; The data acquisition unit is used to receive local magnetic field data and pose deviation parameters based on timestamps and communication interfaces, and to build an airborne equipment data pool. The data cleaning unit is used to filter and denoise the equipment test data pairs in the airborne equipment data pool according to the data type and sort them in descending order to obtain time-series test data pairs. The task parsing unit is used to parse the equipment test task and extract the target magnetic field data and target test pose; The parameter fusion unit is used to perform vector decomposition on the reference magnetic field data and the target magnetic field data to obtain reference azimuth data and target azimuth data in different directions. If any of the target azimuth data is greater than the reference azimuth data, the reference azimuth data is corrected based on the current target azimuth data to generate an azimuth compensation vector; The standard test pose and the target test pose are analyzed to obtain the standard key position coordinates and the target key position coordinates, and the pose coordinate difference is calculated. If the pose coordinate difference is not within the preset attitude tolerance range, the pose coordinate difference is decomposed according to the global coordinate system to obtain the pose orientation vector difference.

6. The magnetic effect safety pre-testing system according to claim 1 or 5, characterized in that, The global main control module also includes: The simulation correction unit is used to correct and evolve the timing test data based on the reverse magnetic field data and the pose deviation parameters, and to calculate the magnetic field compliance and pose conformity. If either of them is less than the corresponding threshold, a magnetic field correction factor is generated based on the magnetic field compliance and magnetic interference factor, and the orientation compensation vector is corrected to obtain the orientation time sequence vector. And / or generate a pose correction factor based on the pose compliance and the mechanism wear factor, and correct the pose orientation vector difference to obtain the pose timing vector. The pattern calibration unit is used to bind the orientation timing vector and the pose timing vector according to the mechanism function identifier to generate a unique test pattern; The instruction conversion unit is used to generate attitude deflection adjustment instructions and magnetic field calibration instructions based on the exclusive test mode and the mechanism communication protocol. The collaborative distribution unit is used to distribute the attitude deflection adjustment command and magnetic field calibration command to the corresponding modules according to the test timing.

7. The magnetic effect safety pre-testing system according to claim 1, characterized in that, The pre-testing system also includes: The anti-interference protection module is used to suppress external magnetic fields and electromagnetic interference of the airborne equipment under test in the test environment, including the shielding cavity and the grounding copper busbar.

8. A magnetic effect safety pre-testing method, applied to the system according to any one of claims 1-7, characterized in that, include: The three-axis magnetic field components of the airborne equipment under test are detected, the three-axis magnetic flux is captured, and converted into local magnetic field data. Based on the dynamic monitoring range of the magnetic field and the preset standard test attitude, the magnetic deflection attitude coordinates of the airborne equipment under test are located and corrected. Based on the preset reference magnetic field data and the test environment magnetic field data, the reverse magnetic field data is calculated, and the local magnetic field data is calibrated. Based on the test mode type and test deviation data, attitude deflection adjustment commands and magnetic field calibration commands are generated and distributed to the corresponding modules, while suppressing external magnetic fields and electromagnetic interference of the airborne equipment under test in the test environment.

9. A storage medium storing at least one instruction, at least one program, a code set, or an instruction set, wherein the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by a processor to implement the magnetic effect safety pre-testing method as described in claim 8.

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