Test system and test method for electromagnetic compatibility

Abstract

The application provides a test system and a test method for electromagnetic compatibility. The test system comprises: a test sample arranged in a test site, wherein the test site is an open test site; a receiving device arranged in the test site and configured to obtain a first electromagnetic signal of the test sample; a plurality of detection devices uniformly arranged around the test site and configured to obtain a second electromagnetic signal outside the test site; and a calculation device configured to calculate electromagnetic compatibility of the test sample based on the first electromagnetic signal and the second electromagnetic signal. The test system for electromagnetic compatibility of the application can identify electromagnetic signals in the environment in time by arranging a plurality of detection devices around the open test site, ensure compensation of the influence of environmental interference signals during the test, avoid errors caused by environmental interference signals on the test results, and thus improve the test accuracy and precision of the test system.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more particularly to the field of electromagnetic compatibility (EMC) technology for vehicles. More specifically, this invention relates to an EMC testing system, an EMC testing method, a computer device for performing the testing method, a computer-readable storage medium for performing the testing method, and a computer program product for performing the testing method. Background Technology

[0002] With the increasing electrification and intelligence of vehicles, a large number of electronic control units (ECUs), sensors, and communication modules are integrated inside the vehicle. The operational stability of these electronic devices in an electromagnetic environment directly affects the vehicle's safety, reliability, and user experience. Therefore, electromagnetic compatibility (EMC) testing is required during the development and production of vehicles to ensure that they meet relevant EMC standards.

[0003] Currently, vehicle EMC testing primarily employs semi-anechoic chamber (SAC) testing and open-field testing (OATS). Semi-anechoic chamber testing simulates vehicle testing in an environment shielded from external electromagnetic interference. This method offers high testing accuracy, accurately measuring and evaluating the electromagnetic radiation and conduction performance of the vehicle and its electronic equipment under various operating modes. However, the high construction cost of semi-anechoic chambers limits its practical application, placing a significant cost burden on vehicle manufacturers. Open-field testing utilizes natural open spaces for electromagnetic radiation and conduction testing. While this method significantly reduces testing costs, its accuracy is lower due to the complexity and uncontrollable factors of the natural environment.

[0004] Therefore, a low-cost and high-precision method is needed to test electromagnetic compatibility. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide an electromagnetic compatibility testing system and corresponding testing method to test electromagnetic compatibility in a cost-effective and reliable manner.

[0006] Therefore, according to one aspect of the present invention, an electromagnetic compatibility (EMC) testing system is provided, the testing system comprising: a test sample arranged in a test area, wherein the test area is an open test area; a receiving device arranged in the test area and configured to acquire a first electromagnetic signal of the test sample; a plurality of detection devices evenly arranged around the test area and configured to acquire a second electromagnetic signal outside the test area; and a computing device configured to calculate the EMC of the test sample based on the first electromagnetic signal and the second electromagnetic signal.

[0007] Based on the above-described technical concept, the present invention may further include any one or more of the following optional forms.

[0008] In some alternative forms, the test system includes a first data processing device configured to acquire the first electromagnetic signal from the receiving device and transmit the first electromagnetic signal to the computing device.

[0009] In some alternative forms, the first data processing device or the computing device is configured to perform a fast Fourier transform on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal into frequency-domain information.

[0010] In some alternative configurations, each of the detection devices is configured to acquire the second electromagnetic signal in the surrounding space, wherein the test system includes a second data processing device configured to acquire the second electromagnetic signal acquired by each of the detection devices and send the second electromagnetic signal to the computing device.

[0011] In some alternative forms, the second data processing device or the computing device is configured to synthesize the second electromagnetic signal in the surrounding space and perform a fast Fourier transform on the synthesized second electromagnetic signal to convert the time-domain information of the second electromagnetic signal into frequency-domain information.

[0012] In some alternative configurations, the receiving device is communicatively connected to the first data processing device and / or the detection device is communicatively connected to the second data processing device via optical fiber and / or shielded cable.

[0013] In some alternative forms, the first data processing device includes a radio frequency receiver or a spectrum analyzer, and / or the second data processing device includes any one of a data acquisition card, a radio frequency receiver, and a spectrum analyzer.

[0014] In some alternative forms, the test system includes a first amplification device and / or a second amplification device, wherein the first amplification device is disposed between the receiving device and the first data processing device to amplify the first electromagnetic signal, and the second amplification device is disposed between the detection device and the second data processing device to amplify the second electromagnetic signal.

[0015] In some alternative forms, the computing device is configured to calculate a first time during which the receiving device and / or the first amplification device and / or the first data processing device and / or the computing device processes the first electromagnetic signal, and a second time during which the detection device and / or the second amplification device and / or the second data processing device and / or the computing device processes the second electromagnetic signal, and to calculate the difference between the first time and the second time, and to perform time alignment processing in response to the calculated difference.

[0016] In some alternative forms, the computing device is configured to calculate a first compensation value for the first electromagnetic signal by the receiving device and / or the first amplification device and / or the first data processing device, and a second compensation value for the second electromagnetic signal by the detection device and / or the second amplification device and / or the second data processing device, and to perform compensation processing in response to the calculated first compensation value and the second compensation value.

[0017] In some alternative forms, the test system includes a calibration unit configured to calibrate the distance between each of the detectors and the receiver, as well as the angle of each detector relative to the receiver with respect to the center of the test site, and to calculate a calibration factor based on the calibrated distances and angles.

[0018] In some alternative forms, the computing device is configured to calculate the electric field strength of the first electromagnetic signal acquired by the receiving device using the following formula:

[0019]

[0020] Where i is the number of the detection devices, K is the calibration factor, and E Ant E is the electric field strength of the first electromagnetic signal acquired by the receiving device. pi E is the electric field strength of the second electromagnetic signal acquired by the detection device. sample The electric field strength of the electromagnetic signal emitted by the test sample.

[0021] In some alternative forms, the computing device is configured to acquire the receiving characteristics of the receiving device for the directionality and receiving efficiency of the electromagnetic signal, and to calculate the electric field energy value received by the receiving device using the following formula:

[0022]

[0023] Among them, EV Ant F represents the electric field energy value received by the receiving device. Ant The receiving characteristics of the receiving device.

[0024] In some alternative forms, the computing device is configured to calculate the electric field energy value emitted by the test sample based on the electric field energy value received by the receiving device, in order to obtain the electromagnetic compatibility of the test sample, wherein the formula for calculating the electric field energy value emitted by the test sample is as follows:

[0025] EV Sample =EV Ant -EV Env

[0026] Among them, EV Sample The electric field energy value emitted by the test sample, EV Env The value of the electric field energy received by the detection device.

[0027] In some alternative forms, the test sample includes a vehicle and / or the vehicle's electronic equipment, and / or the receiving device includes a receiving antenna, and / or the detection device includes a detector, and / or the computing device includes a computer.

[0028] According to another aspect of the present invention, an electromagnetic compatibility (EMC) testing method is provided, the testing method comprising: arranging a test sample in a test site, wherein the test site is an open test site; acquiring a first electromagnetic signal of the test sample; acquiring a second electromagnetic signal outside the test site; and calculating the EMC of the test sample based on the first electromagnetic signal and the second electromagnetic signal.

[0029] In some alternative forms, the testing method includes: acquiring the first electromagnetic signal through a receiving device arranged within the testing site; and / or acquiring the second electromagnetic signal through multiple detection devices evenly arranged around the testing site.

[0030] In some alternative forms, the test method includes performing a fast Fourier transform on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal into frequency-domain information.

[0031] In some alternative forms, the testing method includes: acquiring the second electromagnetic signal in the surrounding space through multiple detection devices; synthesizing the second electromagnetic signal in the surrounding space and performing a fast Fourier transform on the synthesized second electromagnetic signal to convert the time-domain information of the second electromagnetic signal into frequency-domain information.

[0032] In some alternative forms, the test method includes: amplifying the first electromagnetic signal; and / or amplifying the second electromagnetic signal.

[0033] In some alternative forms, the testing method includes: calibrating the distance between each of the detection devices and the receiving device, and the angle of each of the detection devices relative to the receiving device with respect to the center of the test site, and calculating a calibration factor based on the calibrated distance and angle.

[0034] According to another aspect of the present invention, a computer device is provided, the computer device including a memory, a processor and instructions stored in the memory and executable by the processor, wherein the processor performs the electromagnetic compatibility test method described above when executing the instructions.

[0035] According to another aspect of the present invention, a computer-readable storage medium is provided having computer-executable instructions stored thereon for performing the above-described electromagnetic compatibility test method.

[0036] According to another aspect of the present invention, a computer program product is provided, comprising computer-executable instructions that, when executed by at least one processor, implement the above-described electromagnetic compatibility test method.

[0037] The electromagnetic compatibility testing system and method of the present invention identify electromagnetic signals in the environment in a timely manner by arranging multiple detection devices around an open test site, for example, to ensure that the influence of environmental interference signals is compensated during the test, and avoid the error caused by environmental interference signals to the test results in existing open field tests, thereby improving the accuracy and precision of the test. This allows for a reduction in the need for strictly shielded sites and a decrease in the cost of the test system while ensuring test accuracy. Attached Figure Description

[0038] Other features and advantages of the present invention will be better understood through the following detailed description of optional embodiments in conjunction with the accompanying drawings, wherein:

[0039] Figure 1 A schematic diagram of a semi-anechoic chamber testing system in the prior art is shown;

[0040] Figure 2A schematic diagram of an open-field testing system in the prior art is shown;

[0041] Figure 3 A schematic diagram of an electromagnetic compatibility testing system according to an embodiment of the present invention is shown;

[0042] Figure 4 A schematic diagram of an open testing area and related apparatus according to an embodiment of the present invention is shown;

[0043] Figure 5 A system block diagram of an electromagnetic compatibility testing system according to an embodiment of the present invention is shown;

[0044] Figure 6 A schematic diagram of a simplified mathematical model of an electromagnetic compatibility testing system according to an embodiment of the present invention is shown;

[0045] Figure 7 It shows Figure 5 A schematic diagram showing the processing time of electromagnetic signals by each device in the test system.

[0046] Figure 8 It shows Figure 5 A schematic diagram of the time difference in the test system;

[0047] Figure 9 It shows Figure 5 A schematic diagram of the compensation values ​​of the test system in the diagram;

[0048] Figure 10 A schematic flowchart of an electromagnetic compatibility testing method according to an embodiment of the present invention is shown;

[0049] Figure 11 A schematic flowchart of an electromagnetic compatibility testing method according to another embodiment of the present invention is shown; and

[0050] Figure 12 A schematic diagram of a computer device according to an embodiment of the present invention is shown. Detailed Implementation

[0051] The implementation and use of the embodiments are discussed in detail below. While the exemplary methods and systems described below include software and / or firmware executed on hardware within other components, it should be noted that these examples are merely illustrative and should not be considered limiting. Therefore, although exemplary methods and systems have been described below, those skilled in the art will readily understand that the specific embodiments discussed are merely exemplary of particular ways of implementing and using the invention, and not intended to limit the scope of the invention.

[0052] Furthermore, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods and systems according to various embodiments of the present invention. It should be noted that the functions indicated in the blocks may occur in a different order than that shown in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0053] With the development of vehicle electrification, vehicle electrical systems are becoming increasingly complex, leading to a more complex electromagnetic environment within the vehicle and potential electromagnetic compatibility (EMC) issues. One aspect of EMC is that vehicle electronic devices may unintentionally emit and receive electromagnetic waves. In vehicles, wireless communication devices (e.g., car radios, vehicle networking systems) rely on electromagnetic waves to operate, while other electronic devices (e.g., door controllers, window controllers) can be affected by electromagnetic interference, impacting their performance. Therefore, vehicles and their electronic equipment need to meet certain EMC standards to ensure vehicle safety and reliability. Currently, SAC (Safety and Acceptance) testing and OATS (Automatic Auto-Inspection and Testing) are commonly used to test vehicle EMC.

[0054] like Figure 1 As shown, SAC testing is typically conducted in a semi-anechoic chamber, which is a shielded room 10 where, except for the ground 12, the surfaces of the remaining chambers are covered with absorbing material 11. The shielded room 10 is usually made of steel plate, which can both isolate external electromagnetic interference signals and suppress the leakage of test signals from within the shielded room, thus providing bidirectional shielding. The absorbing material 11 can effectively reduce electromagnetic reflection from the surface of the shielded room 10, ensuring that the main electromagnetic interference between the test sample 20 and the receiving device 30 is the direct wave from the test sample 20. Figure 1 Arrow A1 in the image) and the first reflected wave reflected from the ground ( Figure 1 Arrows B2 and B3 in the diagram indicate that the receiving device 30 primarily receives the direct wave from the test sample 20 and the first reflected wave reflected from the ground, thus simulating real-world conditions. Furthermore, the absorbing material 11 can reduce the standing wave within the shielded chamber 10, thereby improving test accuracy. It has been found that while SAC testing offers high accuracy, low uncertainty, and stability, its construction cost is high; typically, the cost of a semi-anechoic chamber and absorbing materials can reach approximately 4 million euros.

[0055] like Figure 2As shown, the OATS test is conducted in an open area, requiring a spacious, unobstructed, and non-reflective environment. An open area is characterized by flat terrain and should be free from interference sources such as buildings, power lines, fences, trees, grounding cables, and conduits (e.g., grounding cables, conduits). Figure 2 As indicated by the arrows L on the left and right sides, this indicates a distance from other interference sources, so that the receiving device 30 mainly receives the direct wave from the test sample 20. Figure 2 Arrow C1 in the image) and the first reflected wave reflected from the ground ( Figure 2 (See arrows D2 and D3 in the diagram). It has been found that although OATS testing is low in cost, it has moderate accuracy, high uncertainty, and is susceptible to environmental influences. Furthermore, the use of the OATS method requires strict site selection and control of the surrounding electromagnetic environment.

[0056] Combination Figure 3 and Figure 4 As shown, an electromagnetic compatibility testing system according to one embodiment of the present invention generally includes a test sample 110, a receiving device 120, multiple detection devices 130, and a computing device 140. Figure 4 In the test, the test sample 110 and the receiving device 120 are arranged in the test area. Figure 4 Within the dashed circle shown in the diagram, multiple detection devices 130 are evenly arranged around the test site. This test site is an open test site; as mentioned above, the open test site should be free of buildings, power lines, fences, trees, grounding cables, pipes, etc. In this embodiment, the open test site can be of diameter d. field A circle with a diameter greater than or equal to 60m is acceptable. However, it is understood that the shape and size of the open testing area are not limited to this and can be set and changed as needed. For example, the open testing area can be elliptical, rectangular, etc., with its major axis or long side ranging from 50m to 100m. In some embodiments, the diameter d of the testing area... field When the distance d is 60m, the distance d between the test sample 110 and the receiving device 120 is... test It can be 10m, which means the distance d between the test sample 110 and the receiving device 120 is... test This is not a limitation and can be changed as needed. For example, the distance between the test sample 110 and the receiving device 120 can be 3m.

[0057] In some embodiments, the test sample 110 may be a vehicle and / or its electronic equipment, which may include, for example, various electronic control units (ECUs) of the vehicle (e.g., engine control module (ECM), body control module (BCM), air conditioning control module (ACM), etc.), in-vehicle entertainment and information systems (e.g., in-vehicle audio system, instrument panel, etc.), and sensors (e.g., lidar, cameras, etc.). It is understood that the electronic equipment in the vehicle is not limited to this and can be modified as needed. In some embodiments, the receiving device 120 may be a receiving antenna that covers a wide frequency band from low to high frequencies, such as the 300 kHz to 18 GHz band, to meet the testing requirements of different frequency electromagnetic radiation in vehicle electromagnetic compatibility testing and improve the adaptability of the testing system. It is understood that the receiving device 120 is not limited to this and can be modified as needed. In some embodiments, the detection device 130 can be a detector. Specifically, the detector can be an electric field probe and a magnetic field probe. The electric field probe is suitable for detecting electric field interference from outside the test site, and the magnetic field probe is suitable for detecting magnetic field interference from outside the test site. Combining the electric field probe and the magnetic field probe can provide accurate frequency and field strength information of the interference signal, improving test accuracy. It is understood that the detection device 130 is not limited to this and can be modified as needed. In some embodiments, the computing device 140 can be a computer. A computer has fast data processing and computing capabilities, enabling high-precision data calculations and improving the testing efficiency and accuracy of the test system. It is understood that the computing device 140 is not limited to this and can be modified as needed.

[0058] in addition, Figure 4 The diagram shows four detection devices 130 evenly arranged around the test site to acquire electromagnetic interference from various directions outside the test site. It is understood that the number of detection devices 130 is not limited to this and can be changed as needed, for example, Figure 4 The diagram also shows an additional detection device 130a evenly arranged among the various detection devices 130. The detection device 130a may be the same as the detection device 130, for example, a detector, specifically an electric field probe and a magnetic field probe, to improve the test accuracy.

[0059] The receiving device 120 is used to acquire a first electromagnetic signal from the test sample 110, the detection device 130 is used to acquire a second electromagnetic signal from outside the test site, and the computing device 140 receives the first electromagnetic signal from the receiving device 120 and the second electromagnetic signal from the detection device 130, and calculates the electromagnetic compatibility of the test sample 110 based on the first electromagnetic signal and the second electromagnetic signal.

[0060] In this way, the electromagnetic compatibility testing system of the present invention identifies electromagnetic signals in the environment in a timely manner by arranging multiple detection devices 130 around an open test site, for example, to ensure that the influence of environmental interference signals is compensated during the test, and avoids the error caused by environmental interference signals to the test results in existing open field tests, thereby improving the accuracy and precision of the test. This allows for a reduction in the need for strictly shielded sites and a decrease in the cost of the testing system while ensuring test accuracy.

[0061] It should be noted that the multiple detection devices 130 actually acquire electromagnetic signals from the test sample 110 and the outside of the test site. In this embodiment, according to the CISPR (International Special Committee on Radio Interference) standard regarding the size of the test site, it is assumed that the test sample 110 has the greatest impact on the receiving device 120. Specifically, the diameter of the test site is 60m, i.e., the radius is 30m, and the distance between the test sample 110 and the receiving device 120 is 10m. According to electromagnetic theory, the impact of the test sample on the receiving antenna is approximately 10 times (approximately 20dB) greater than the impact of the test sample on the detection device. According to CISPR Part 16-1-4, "an ambient level 20dB or more below the measurement radiation limit is considered optimal." Thus, since the difference between the impact of the test sample 110 on the receiving device 120 and its impact on the detection device 130 is approximately 20dB, in this embodiment, the impact of the test sample 110 on the detection device 130 is negligible. That is, the second electromagnetic signal only includes the impact of the outside of the test site on the detection device 130, and the impact of the test sample 110 on the detection device 130 is ignored.

[0062] Reference Figure 5 The test system also includes a first data processing device 151 and a second data processing device 152. The first data processing device 151 is coupled between the receiving device 120 and the computing device 140, and is used to acquire a first electromagnetic signal from the receiving device 120 and send the acquired first electromagnetic signal to the computing device 140. In some embodiments, the first data processing device 151 may include a radio frequency receiver or a spectrum analyzer to acquire the first electromagnetic signal from the receiving device 120. The signal acquired by the receiving device 120 typically contains a large number of high-frequency or low-frequency electromagnetic waves, and the signal strength may be unstable. The first data processing device 151 can adjust the electromagnetic signal to a suitable frequency and intensity range, providing a stable signal output, and can filter the electromagnetic signal to ensure a more reliable data basis for processing in the computing device 140, thereby improving test accuracy. It is understood that the first data processing device 151 is not limited to this and can be modified as needed. Additionally, the first data processing device 151 can also perform Fast Fourier Transform (FFT) processing on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal (such as...) into... Figure 5The dashed box T1 in the image is converted into frequency domain information (such as...). Figure 5 (As shown in the dashed box F1 in the figure). The first electromagnetic signal from the test sample 110 is typically represented by time-domain information, that is, the first electromagnetic signal exists in the form of voltage or current that varies with time. Its time-domain information can represent the change of the amplitude of the electromagnetic signal over time. However, the electromagnetic signal itself contains characteristics such as frequency, phase, and amplitude. Therefore, by using FFT processing, these characteristics can be further analyzed to help characterize the normal operating frequency band of the test sample 110, such as 700MHz to 3.5GHz, and to more intuitively compare it with environmental interference signals. It is understood that the device for performing FFT processing is not limited to this. For example, FFT processing can also be performed in the computing device 140 to reduce the data processing requirements of the first data processing device 151 and reduce the cost of the first data processing device 151.

[0063] Combination Figure 5 and Figure 6 The second data processing device 152 can collect the second electromagnetic signal from the detection device 130. Specifically, each detection device 130 acquires the second electromagnetic signal in the surrounding space, such as... Figure 6 As shown, each detection device 130 acquires second electromagnetic signals from three orthogonal axes. Specifically, each detection device 130 acquires electromagnetic signals from outside the test site in the x, y, and z directions, respectively. This allows for comprehensive capture of electromagnetic signals from environmental interference in all directions, accurately reflecting the electromagnetic interference situation and improving test accuracy. A second data processing device 152 is coupled between the detection device 130 and the computing device 140, and collects the second electromagnetic signals acquired by each detection device 130. In this embodiment, the second data processing device 152 collects the second electromagnetic signals from each orthogonal axis of the detection device 130 and sends the collected second electromagnetic signals to the computing device 140. In some embodiments, the second data processing device 152 may include a data acquisition card with multi-channel input, capable of acquiring the second electromagnetic signals acquired by the detection device 130 at a high sampling rate and accuracy, enabling real-time signal acquisition. It is understood that the second data processing device 152 is not limited to this and can be modified as needed. For example, the second data processing device 152 can also be a radio frequency receiver or a spectrum analyzer, etc. Here, the radio frequency receiver and spectrum analyzer can be a multi-channel radio frequency receiver and a multi-channel spectrum analyzer to acquire the second electromagnetic signal in the surrounding space from multiple channels. In addition, the second data processing device 152 can synthesize the second electromagnetic signal in the surrounding space. In this embodiment, the second electromagnetic signals of three orthogonal axes can be synthesized ( Figure 6The hollow arrow in the diagram indicates an example direction of the synthesized second electromagnetic signal, and the synthesized second electromagnetic signal is subjected to FFT processing to extract the time-domain information of the second electromagnetic signal (such as...). Figure 5 The dashed box T2 in the image is converted into frequency domain information (such as...). Figure 5 (As shown in the dashed box F2 in the figure). It is understood that the apparatus for performing signal synthesis and FFT processing is not limited to this. For example, signal synthesis and FFT processing can also be performed in the computing device 140 to reduce the data processing requirements of the second data processing device 152 and reduce the cost of the second data processing device 152.

[0064] like Figure 5 As shown, a first amplification device 161 can be disposed between the receiving device 120 and the first data processing device 151 to amplify the first electromagnetic signal. A second amplification device 162 can be disposed between the detection device 130 and the second data processing device 152 to amplify the second electromagnetic signal. This allows the first and second electromagnetic signals to be amplified to a more easily processed level, reducing the time spent on signal amplification by the first and second data processing devices 151 and 152, and improving their data processing and conversion efficiency. Furthermore, the amplification devices can compensate for the attenuation of the electromagnetic signal during transmission, ensuring that the signal strength received by the data acquisition device is close to the actual strength, avoiding signal amplitude reduction due to transmission loss, and further improving the testing accuracy of the testing system.

[0065] In some embodiments, the receiving device 120 and the first data processing device 151, and / or the detection device 130 and the second data processing device 152, can be communicatively connected via optical fiber or shielded cable. Shielded cable effectively reduces external electromagnetic interference, protecting the signals transmitted from the receiving device 120 or the detection device 130 from external interference, while also suppressing electromagnetic interference generated by the cable itself, preventing interference to the test system and surrounding equipment. Optical fiber transmits signals in the form of optical signals rather than electrical signals, ensuring that the electromagnetic signals transmitted by the receiving device 120 and / or the detection device 130 are unaffected by any electromagnetic interference, thereby accurately reflecting the electromagnetic characteristics of the test environment and the test sample 110. Advantageously, the receiving device 120 and the first data processing device 151 are connected via shielded cable, the detection device 130 and the second data processing device 152 are connected via optical fiber, and further, the second amplification device 162 and the second data processing device 152 are connected via optical fiber. The receiving device 120 is typically a receiving antenna. Receiving antennas have high gain and can effectively convert and receive electromagnetic signal energy. Therefore, even if signal attenuation occurs along the transmission path, a relatively stable signal can be output after gain compensation by the first amplification device 161. Furthermore, if fiber optic communication is used between the receiving device 120 and the first data processing device 151, a high-power fiber optic system is required, increasing the cost of the test system. The detection device 130 typically has a lower gain than the receiving antenna and is more sensitive to signal attenuation along the transmission path. Fiber optics, however, experiences almost no attenuation over long distances, improving signal stability during transmission. In addition, using a shielded cable between the detection device 130 and the second amplification device 162 ensures convenient installation and debugging of the detection device 130. Using fiber optics between the second amplification device 162 and the second data processing device 152 fully utilizes the electrical isolation and electromagnetic interference immunity of fiber optics, thus improving the stability of the test system during testing.

[0066] The process by which the computing device 140 calculates the electromagnetic compatibility of the test sample 110 will be described in detail below.

[0067] After the second data processing device 152 or the computing device 140 synthesizes the second electromagnetic signals of the three orthogonal axes, the electric field strength E of the synthesized second electromagnetic signal is calculated. pi The calculation formula (1) is as follows:

[0068]

[0069] Where i represents the number of detection devices 130.

[0070] In addition, electric field strength is usually expressed in decibels (dB), and the unit of electric field strength is usually dBμV / m. When the second data processing device 152 displays a unit field strength of μV / m, the second data processing device 152 or the calculation device 140 can convert the unit field strength to obtain the electric field strength expressed in decibels. The calculation formula (2) is as follows:

[0071]

[0072] Furthermore, in this embodiment, it is assumed that the environmental interference signal outside the test site is a parallel wave. Specifically, when the environmental interference source is close to the detection device 130, the electromagnetic signal emitted by the environmental interference source will propagate in the form of a spherical wave. This is because the electromagnetic wave diffuses outward from the environmental interference source, and this diffusion exhibits a spherical structure. The characteristic of a spherical wave is that the signal exhibits strong directionality and non-uniformity in the region close to the interference source; that is, the electric field strength of the electromagnetic signal varies significantly in this region. When the environmental interference source is far from the detection device 130, the electromagnetic signal emitted by the environmental interference source will gradually tend towards a parallel wave during propagation. At this time, the electromagnetic signal acquired by the detection device 130 is roughly from the same direction and relatively uniform. Thus, during the selection of the test site, spherical wave interference sources can be identified and eliminated. For example, the degree of change in the detector signal with the detection distance can be used to identify spherical wave interference sources. When the signal strength changes rapidly with the movement of the detection device 130, it indicates that the interference source is close to the detection device 130, and the interference source can be shielded or a new test site can be selected.

[0073] Thus, the formula (3) for calculating the electric field strength at the receiving device 120 is as follows:

[0074]

[0075] Among them, E Ant E represents the electric field strength of the first electromagnetic signal acquired by the receiving device 120. sample K is a calibration factor used to measure the electric field strength of the electromagnetic signal emitted by the test sample 110. Specifically, the test system may include a calibration unit 170, which is used to calibrate the distance d between each detection device 130 and the receiving device 120. i and each detection device 130 is located at the center O of the test site. Figure 6 (As shown in the figure) is the reference angle θ relative to the receiving device 120. iIn this embodiment, the test site is a circular area, with the center O of the test site considered as the center of the circle. According to the propagation characteristics of electromagnetic waves, the electric field strength decreases with increasing distance. Therefore, as the detection device 130 moves away from the test sample 110, the acquired electromagnetic signal gradually weakens. The calibration factor K ensures that the signal strength measured under different distances and angles is converted into the electric field strength at the test sample 110, thereby eliminating measurement deviations caused by factors such as the directionality of the electromagnetic signal, distance attenuation, and environmental multipath effects, making the electric field strength calculation more accurate and consistent. In some embodiments, before the test begins, the receiving device 120 can be replaced with the detection device 130, and the electric field strength of the electromagnetic signals from the detection devices 130 around the test site can be compared with that of the detection device 130 at the receiving device 120 to calculate the calibration factor K.

[0076] According to the calculation formula (3), the electric field strength of the electromagnetic signal emitted by the test sample 110 can be obtained by the calculation formula (4).

[0077]

[0078] It is known that the energy acquired by the receiving device 120 depends on the electric field strength at the end of the receiving device 120 and the receiving characteristics of the receiving device 120 for the directionality and receiving efficiency of the electromagnetic signal. These receiving characteristics are usually expressed as a function including amplitude and direction, where amplitude is the intensity of the electromagnetic signal acquired by the receiving device, and direction is the receiving direction of the electromagnetic signal in space, as calculated by formula (5).

[0079]

[0080] Among them, F Ant For the receiving characteristics of receiving device 120, A x (x,y,z) represents the amplitude coefficient of the receiving device 120 in the x-direction, A y (x,y,z) represents the amplitude coefficient of the receiving device 120 in the y-direction, A z (x,y,z) represents the amplitude coefficient of the receiving device 120 in the z-direction. These are unit vectors in the x, y, and z directions, used to represent direction. The amplitude coefficient A represents the receiving efficiency of the receiving device 120 for electric field strengths in different directions.

[0081] The computing device 140 can acquire the receiving characteristics of the receiving device 120. For example, the receiving characteristics of the receiving device 120 can be pre-stored in the computing device 140, or the computing device 140 can acquire the receiving characteristics of the receiving device 120 from an external database or the cloud. The computing device 140 calculates the electric field energy value received by the receiving device 120 based on the receiving characteristics. The calculation formula (6) is as follows:

[0082]

[0083] Among them, EV Ant The value of the electric field energy received by the receiving device 120.

[0084] Here, the electric field energy value EV of the receiving device 120 is used. Ant The following assumptions are made regarding the two terms on the right side of the calculation formula (6).

[0085]

[0086] Thus, the formula (7) for calculating the electric field energy value emitted by test sample 110 can be obtained.

[0087] EV Sample =EV Ant -EV Env (7)

[0088] Among them, EV Env The value of the electric field energy received by the detection device 130.

[0089] In this way, the electric field energy value emitted by the test sample 110 can be calculated by the computing device 140. This electric field energy value can then be used to determine whether the test sample 110 meets electromagnetic compatibility requirements. Specifically, by comparing the actual electric field energy value emitted by the test sample 110 with the electromagnetic emission standard limits of different industries and countries (e.g., CISPR, FCC (Federal Communications Commission) standards), it can be determined whether the test sample 110 meets electromagnetic compatibility requirements. If the energy emitted by the test sample 110 exceeds the specified limit, it may interfere with nearby equipment, communication systems, or other electronic devices. In this case, the test sample 110 can be shielded; for example, conductive materials can be used to effectively shield the test sample 110 and its sensitive components to prevent electromagnetic wave leakage or entry.

[0090] Combination Figure 7 and Figure 8 As shown, since the computing device 140 simultaneously receives electromagnetic signals from the test sample 110 ( Figure 7 (dashed box A in the image) and electromagnetic signals from the external environment ( Figure 7 The dashed box B in the figure indicates that a time difference exists in signal transmission. In this embodiment, the computing device 140 calculates the time difference between the electromagnetic signal transmission of the test sample 110 (hereinafter referred to as the "sample system") and the electromagnetic signal transmission of the external environment (hereinafter referred to as the "external system") to compensate for or correct the time difference. Specifically, as shown in the figure... Figure 7As shown, the signal transmission and processing time in the test system mainly includes any one or more of the following: T0 is the time when the test sample 110 emits an electromagnetic signal; t1 is the time when the receiving device 120 acquires the first electromagnetic signal, and t'1 is the time when the detection device 130 acquires the second electromagnetic signal; t2, t4, and t6 are the times when the first electromagnetic signal passes through the shielded cable and / or optical fiber, and t'2, t'4, and t'6 are the times when the second electromagnetic signal passes through the shielded cable and / or optical fiber; t3 is the time delay and phase shift generated by the first amplification device 161, and t'3 is the time delay and phase shift generated by the second amplification device 162; t5 is the time required for the first data processing device 151 to process and / or convert data, and t'5 is the time required for the second data processing device 152 to process and / or convert data; t7 and t'7 are the times when the computing device 140 calculates and records data for the first and second electromagnetic signals, respectively.

[0091] like Figure 8 As shown, in the sample system, the time for the receiving device 120 to acquire and transmit the first electromagnetic signal is T1 = T0 + t1; the time for the first electromagnetic signal to be transmitted to the first amplification device 161 is T2 = T1 + t2; the time for the first amplification device 161 to amplify the first electromagnetic signal is T3 = T2 + t3; the time for the amplified first electromagnetic signal to be transmitted to the first data processing device 151 is T4 = T3 + t4; the time for the first data processing device 151 to process and / or convert the amplified first electromagnetic signal is T5 = T4 + t5; the time for the processed and / or converted first electromagnetic signal to be transmitted to the computing device 140 is T6 = T5 + t6; and the time for the computing device 140 to calculate and / or record the processed and / or converted first electromagnetic signal is T7 = T6 + t7. In other words, the total time for the transmission and processing of the electromagnetic signal in the sample system is the first time T7 = T6 + t7.

[0092] Furthermore, in the external system, the time for the detection device 130 to acquire and transmit the second electromagnetic signal is T'1 = T0 + t'1; the time for the second electromagnetic signal to be transmitted to the second amplification device 162 is T'2 = T'1 + t'2; the time for the second amplification device 162 to amplify the second electromagnetic signal is T'3 = T'2 + t'3; the time for the amplified second electromagnetic signal to be transmitted to the second data processing device 152 is T'4 = T'3 + t'4; the time for the second data processing device 152 to process and / or convert the amplified second electromagnetic signal is T'5 = T'4 + t'5; the time for the processed and / or converted second electromagnetic signal to be transmitted to the computing device 140 is T'6 = T'5 + t'6; and the time for the computing device 140 to calculate and / or record the processed and / or converted second electromagnetic signal is T'7 = T'6 + t'7. In other words, the total time for the transmission and processing of the electromagnetic signal in the external system is the second time T'7 = T'6 + t'7.

[0093] Therefore, the time difference between the sample system and the external system is calculated using formula (8).

[0094]

[0095] After obtaining the difference between the first time T7 of the sample system and the second time T'7 of the external system, the computing device 140 can perform time alignment processing. Specifically, based on the time difference data, the timestamps of the data from the sample system and the external system are adjusted to the same reference time to ensure that the data from both systems are collected and processed at the same point in time, avoiding data errors caused by time delay. After time alignment is completed, the electromagnetic signals of the sample system and the external system can be analyzed under the same time reference to more accurately evaluate the electromagnetic compatibility of the test sample 110 and improve the test accuracy of the test system.

[0096] like Figure 9 As shown, since electromagnetic signals undergo attenuation during transmission, affecting signal strength, in this embodiment, the computing device 140 can calculate the attenuation during signal transmission to make the data calculated and processed by the computing device 140 approximate the actual scenario. Specifically, in the sample system, the computing device 140 calculates a first compensation value, which includes: the attenuation value -L1 of the first electromagnetic signal transmitted from the receiving device 120 to the first amplification device 161, the amplification value A2 of the first electromagnetic signal in the first amplification device 161, the attenuation value -L3 of the first electromagnetic signal transmitted from the first amplification device 161 to the first data processing device 151, and the amplification value A4 of the first electromagnetic signal in the first data processing device 151. In the external system, the computing device 140 calculates a second compensation value, which includes: the attenuation value -L'1 of the second electromagnetic signal transmitted from the detection device 130 to the second amplification device 162, the amplification value A'2 of the second electromagnetic signal in the second amplification device 162, the attenuation value -L'3 of the second electromagnetic signal transmitted from the second amplification device 162 to the second data processing device 152, and the amplification value A'4 of the second electromagnetic signal in the second data processing device 152. It should be noted that since the distances between the first data processing device 151 and the computing device 140, and between the second data processing device 152 and the computing device 140, are relatively close, signal attenuation is ignored in this embodiment. Furthermore, when the second data processing device 152 is a data acquisition card, the influence of the second data processing device 152 on the second electromagnetic signal can be ignored, because data acquisition cards typically do not contain attenuators or internal amplifiers.

[0097] Thus, the formula (9) for calculating the first compensation value of the sample system is as follows:

[0098] C Sample=-(-L1+A2-L3+A4) (9)

[0099] The formula (10) for calculating the second compensation value of the external system is as follows:

[0100] C Pi =-(-L ′ 1+A ′ 2-L ′ 3+A ′ 4) (10)

[0101] After calculating the first and second compensation values, the computing device 140 can perform compensation processing in response to the calculated values. Specifically, compensation processing can be performed by adjusting the amplitude of the electromagnetic signal, so that the signal strength received by the computing device 140 reflects the true electric field strength. This reduces deviations during signal transmission, ensures more accurate test signals, and the compensated signal data more accurately reflects the electromagnetic compatibility of the test sample 110, further improving the testing accuracy of the testing system.

[0102] Reference Figure 10 An electromagnetic compatibility testing method according to an embodiment of the present invention includes the following steps:

[0103] Step S101: Arrange test samples 110 in the test site, wherein the test site is an open test site.

[0104] Step S102: Obtain the first electromagnetic signal of test sample 110.

[0105] Step S103: Acquire a second electromagnetic signal from outside the test site.

[0106] Step S104: Calculate the electromagnetic compatibility of test sample 110 based on the first electromagnetic signal and the second electromagnetic signal.

[0107] Please refer to the above text for the function of the electromagnetic compatibility test method according to this embodiment. Figures 3 to 6 The content mentioned above will not be repeated here.

[0108] Reference Figure 11 According to another embodiment of the present invention, the electromagnetic compatibility testing method includes the following steps:

[0109] Step S201: Arrange the test sample 110 and the receiving device 120 in the test site, and evenly arrange multiple detection devices 130 around the test site, wherein the test site is an open test site.

[0110] Step S202: Calibrate the distance between each detection device 130 and the receiving device 120, as well as the angle of each detection device 130 relative to the receiving device 120 with the center O of the test site as a reference, and calculate the calibration factor based on the calibrated distance and angle.

[0111] Step S203: Acquire the first electromagnetic signal of the test sample 110 through the receiving device 120.

[0112] Step S204: Amplify the first electromagnetic signal.

[0113] Step S205: Acquire a second electromagnetic signal outside the test site through multiple detection devices 130.

[0114] Step S205 further includes: acquiring a second electromagnetic signal in the surrounding space through multiple detection devices 130.

[0115] Step S206: Amplify the second electromagnetic signal.

[0116] Step S207: Perform a Fast Fourier Transform on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal into frequency-domain information.

[0117] Step S208: Synthesize the second electromagnetic signal in the surrounding space and perform a fast Fourier transform on the synthesized second electromagnetic signal to convert the time domain information of the second electromagnetic signal into the frequency domain information.

[0118] Step S209: Calculate the electromagnetic compatibility of test sample 110 based on the first electromagnetic signal and the second electromagnetic signal.

[0119] Please refer to the above text for the function of the electromagnetic compatibility test method according to this embodiment. Figures 3 to 9 The content mentioned above will not be repeated here.

[0120] Reference Figure 12 , Figure 12 This is a schematic diagram of a computer device according to one embodiment of the present invention.

[0121] The present invention also provides a computer device 200, such as Figure 12 As shown, the computer device 200 may include a memory 210 and a processor 220. The memory 210 may store instructions 211, which may be executed by the processor 220. When the processor 220 executes the instructions 211, it implements the electromagnetic compatibility test method according to the above-described embodiment.

[0122] The computer device 200 in this embodiment can be a laptop, desktop computer, or cloud server, etc. It is understood that the components included in the computer device 200 are not limited to the memory 210 and processor 220, and can vary depending on different needs. Exemplarily, the computer device 200 may also include multiple components connected to its input / output interfaces (…). Figure 12 (Not shown in the image), including but not limited to: input units, such as keyboards, mice, etc.; output units, such as displays, speakers, etc.; storage units, such as semiconductor storage devices, magnetic surface storage devices, optical storage devices, etc.; and communication units, such as network interface cards, wireless communication transceivers, etc.

[0123] In some implementations, memory 210 may include, for example, random access memory (RAM) or read-only memory (ROM). Memory 210 may be used to store instructions, programs, code, and other programs and data required by the computer device, but is not limited thereto.

[0124] In addition, the processor 220 can be a central processing unit (CPU) or other general-purpose processors, such as digital signal processing (DSP), field-programmable gate array (FPGA), programmable logic array (PLA), etc.

[0125] In an exemplary embodiment of the present invention, a computer-readable storage medium is also provided having computer-executable instructions stored thereon for performing an electromagnetic compatibility test method according to the above embodiments.

[0126] Alternatively, the computer-readable storage medium according to this embodiment may be a ROM, RAM, semiconductor storage device, magnetic surface storage device, and optical storage device, etc.

[0127] The present invention also proposes a computer program product comprising computer-executable instructions that, when executed, cause at least one processor to perform an electromagnetic compatibility test method according to the above embodiments.

[0128] Generally, various embodiments of the present invention can be implemented in hardware, dedicated circuitry, software programs, firmware, logic circuitry, or any combination thereof, as needed. Specifically, some aspects may be implemented in hardware, while others may be implemented in firmware or software programs executable by a controller, microprocessor, or other computing device. When aspects of embodiments of the present invention are illustrated or described as block diagrams, flowcharts, or using some other graphical representation, it will be understood that the blocks, apparatuses, systems, techniques, or methods described herein can be implemented as non-limiting examples in hardware, software, firmware, dedicated circuitry, logic circuitry, general-purpose hardware, or controllers or other computing devices, or some combination thereof.

[0129] Computer-readable program instructions or computer program products for executing various embodiments of the present invention can also be stored in the cloud. When needed, users can access the computer-readable program instructions stored in the cloud for executing an embodiment of the present invention via mobile internet, fixed network or other networks, thereby implementing various embodiments of the present invention.

[0130] It should be understood that the embodiments shown in the figures only illustrate optional configurations of the electromagnetic compatibility testing system according to the present invention; however, they are merely illustrative and not limiting. Other configurations may be adopted without departing from the spirit and scope of the present invention.

[0131] The technical content and features of the present invention have been disclosed above. However, it is understood that those skilled in the art can make various changes and improvements to the disclosed concepts under the inventive concept of the present invention, all of which fall within the protection scope of the present invention. The description of the above embodiments is illustrative rather than restrictive, and the protection scope of the present invention is determined by the claims.

Claims

1. An electromagnetic compatibility testing system, characterized in that, The testing system includes: Test sample (110), the test sample (110) is arranged in the test site, wherein the test site is an open test site; A receiving device (120) is arranged in the test site and configured to acquire a first electromagnetic signal of the test sample (110); Multiple detection devices (130) are evenly arranged around the test site and configured to acquire a second electromagnetic signal outside the test site; A computing device (140) configured to calculate the electromagnetic compatibility of the test sample (110) based on the first electromagnetic signal and the second electromagnetic signal.

2. The testing system according to claim 1, characterized in that, The test system includes a first data processing device (151) configured to acquire the first electromagnetic signal from the receiving device (120) and send the first electromagnetic signal to the computing device (140).

3. The testing system according to claim 2, characterized in that, The first data processing device (151) or the computing device (140) is configured to perform a fast Fourier transform on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal into frequency-domain information.

4. The testing system according to claim 2, characterized in that, Each of the detection devices (130) is configured to acquire the second electromagnetic signal in the surrounding space, wherein the test system includes a second data processing device (152), which is configured to acquire the second electromagnetic signal acquired by each of the detection devices (130) and send the second electromagnetic signal to the computing device (140).

5. The testing system according to claim 4, characterized in that, The second data processing device (152) or the computing device (140) is configured to synthesize the second electromagnetic signal in the surrounding space and perform fast Fourier transform processing on the synthesized second electromagnetic signal to convert the time domain information of the second electromagnetic signal into frequency domain information.

6. The testing system according to claim 4, characterized in that, The receiving device (120) and the first data processing device (151) and / or the detection device (130) and the second data processing device (152) are connected by optical fiber and / or shielded cable.

7. The testing system according to any one of claims 4 to 6, characterized in that, The first data processing device (151) includes a radio frequency receiver or a spectrum analyzer, and / or the second data processing device (152) includes any one of a data acquisition card, a radio frequency receiver, and a spectrum analyzer.

8. The testing system according to any one of claims 4 to 6, characterized in that, The testing system includes a first amplification device (161) and / or a second amplification device (162). The first amplification device (161) is located between the receiving device (120) and the first data processing device (151) to amplify the first electromagnetic signal. The second amplification device (162) is located between the detection device (130) and the second data processing device (152) to amplify the second electromagnetic signal.

9. The testing system according to claim 8, characterized in that, The computing device (140) is configured to calculate a first time when the receiving device (120) and / or the first amplification device (161) and / or the first data processing device (151) and / or the computing device (140) processes the first electromagnetic signal, and a second time when the detection device (130) and / or the second amplification device (162) and / or the second data processing device (152) and / or the computing device (140) processes the second electromagnetic signal, and to calculate the difference between the first time and the second time, and to perform time alignment processing in response to the calculated difference.

10. The testing system according to claim 8, characterized in that, The computing device (140) is configured to calculate a first compensation value for the first electromagnetic signal by the receiving device (120) and / or the first amplifying device (161) and / or the first data processing device (151), and a second compensation value for the second electromagnetic signal by the detection device (130) and / or the second amplifying device (162) and / or the second data processing device (152), and to perform compensation processing in response to the calculated first compensation value and the second compensation value.

11. The testing system according to any one of claims 1 to 6, characterized in that, The testing system includes a calibration unit (170) configured to calibrate the distance between each of the detection devices (130) and the receiving device (120) and the angle of each of the detection devices (130) relative to the receiving device (120) with respect to the center (O) of the test site, and to calculate a calibration factor based on the calibrated distance and angle.

12. The testing system according to claim 11, characterized in that, The computing device (140) is configured to calculate the electric field strength of the first electromagnetic signal acquired by the receiving device (120) using the following formula: Where i is the number of the detection devices (130), K is the calibration factor, and E Ant E is the electric field strength of the first electromagnetic signal acquired by the receiving device (120). pi E is the electric field strength of the second electromagnetic signal acquired by the detection device (130). sample The electric field strength of the electromagnetic signal emitted by the test sample (110).

13. The testing system according to claim 12, characterized in that, The computing device (140) is configured to acquire the directionality and reception efficiency of the receiving device (120) for electromagnetic signals, and to calculate the electric field energy value received by the receiving device (120) using the following formula: Among them, EV Ant F is the electric field energy value received by the receiving device (120). Ant The receiving characteristics of the receiving device (120).

14. The testing system according to claim 13, characterized in that, The computing device (140) is configured to calculate the electric field energy value emitted by the test sample (110) based on the electric field energy value received by the receiving device (120) to obtain the electromagnetic compatibility of the test sample (110), wherein the calculation formula for the electric field energy value emitted by the test sample (110) is as follows: HOUSE Sample =EV Ant -HOUSE Env Among them, EV Sample The electric field energy value emitted by the test sample (110), EV Env The electric field energy value received by the detection device (130).

15. The testing system according to any one of claims 1 to 6, characterized in that, The test sample (110) includes a vehicle and / or electronic equipment of the vehicle, and / or the receiving device (120) includes a receiving antenna, and / or the detection device (130) includes a detector, and / or the computing device (140) includes a computer.

16. A method for testing electromagnetic compatibility, characterized in that, The testing method includes: Test samples (110) (S101) are arranged in the test site, wherein the test site is an open test site; Acquire the first electromagnetic signal of the test sample (110) (S102); Acquire the second electromagnetic signal outside the test site (S103); The electromagnetic compatibility of the test sample (110) is calculated based on the first electromagnetic signal and the second electromagnetic signal (S104; S209).

17. The test method according to claim 16, characterized in that, The testing method includes: acquiring the first electromagnetic signal through a receiving device (120) (S203), the receiving device (120) being arranged in the test site; and / or acquiring the second electromagnetic signal through a plurality of detection devices (130) (S205), the plurality of detection devices (130) being evenly arranged around the test site.

18. The test method according to claim 16, characterized in that, The testing method includes: performing a fast Fourier transform on the first electromagnetic signal to convert the time-domain information of the first electromagnetic signal into frequency-domain information (S207).

19. The test method according to claim 17, characterized in that, The testing method includes: The second electromagnetic signal in the surrounding space is acquired by multiple detection devices (130); The second electromagnetic signal in the surrounding space is synthesized and the synthesized second electromagnetic signal is processed by fast Fourier transform to convert the time domain information of the second electromagnetic signal into frequency domain information (S208).

20. The test method according to any one of claims 16 to 19, characterized in that, The test method includes: amplifying the first electromagnetic signal (S204); and / or amplifying the second electromagnetic signal (S206).

21. The test method according to any one of claims 16 to 19, characterized in that, The testing method includes: calibrating the distance between each of the detection devices (130) and the receiving device (120) and the angle of each of the detection devices (130) relative to the receiving device (120) with reference to the center (O) of the test site, and calculating a calibration factor (S202) based on the calibrated distance and angle.

22. A computer device, characterized in that, The computer device (200) includes a memory (210), a processor (220), and instructions (211) stored in the memory (210) and executable by the processor (220), wherein the processor (220) executes the instructions (211) to implement the electromagnetic compatibility test method according to any one of claims 16 to 21.

23. A computer-readable storage medium, characterized in that, The computer-readable storage medium has computer-executable instructions stored thereon for performing the electromagnetic compatibility test method according to any one of claims 16 to 21.

24. A computer program product comprising computer-executable instructions, characterized in that, When the computer-executable instructions are executed by at least one processor, the electromagnetic compatibility test method according to any one of claims 16 to 21 is implemented.

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