Method, device and equipment for measuring high-frequency electromagnetic radiation of vehicle, medium and product

Abstract

The invention discloses a vehicle high-frequency electromagnetic radiation measurement method, device, equipment, medium and product, and relates to the technical field of vehicle test.The method comprises the steps that field uniformity verification is conducted on a whole vehicle electromagnetic reverberation chamber, it is determined that the field uniformity in a target frequency band meets the requirement, a tested vehicle needs to be parked in the whole vehicle electromagnetic reverberation chamber, and the tested vehicle needs to be parked in the target frequency band; all electric equipment which is not necessary for testing is closed by the vehicle; measuring the insertion loss of the whole vehicle electromagnetic reverberation chamber by using a vector network analyzer; performing a radiation emission test on the vehicle in the target frequency band, and receiving and recording test data by using an EMI receiver; and calculating the radiation emission power and the radiation field intensity of the vehicle based on the test data and the insertion loss.

Description

Technical Field

[0001] The present application relates to the field of vehicle testing technology, and in particular to a method, device, equipment, medium and product for measuring high-frequency electromagnetic radiation of a vehicle. Background Art

[0002] The open field is the recommended radiation emission measurement site in the standard. When different measurement sites cause differences in test results, the measurement results of the open test site shall prevail. When performing radiation emission measurements in an open field, the receiving antenna receives the vector sum of the direct wave and the reflected wave. The maximum acceptance value can only be obtained when the difference between the reflected wave and the direct wave path is an integer multiple of the wavelength. Therefore, the receiving antenna needs to scan at a specified height, and for different frequencies, the height at which the maximum field strength is received is different. Therefore, a long measurement time is required to obtain accurate results.

[0003] At present, the method of using semi-anechoic chambers to replace open test fields for radiation emission measurement has been widely used. However, since the semi-anechoic chamber is a replacement for the open field, the receiving antenna still needs to scan the height to determine the maximum value of the vehicle's electromagnetic radiation. In addition, due to the complexity of the vehicle's internal structure, when measuring the vehicle's electromagnetic radiation emission, it is necessary to consider the vehicle's radiation surface and polarization direction to the antenna, which greatly increases the measurement time. Summary of the invention

[0004] The purpose of this application is to provide a method, device, equipment, medium and product for measuring high-frequency electromagnetic radiation of a vehicle.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a method for measuring high-frequency electromagnetic radiation of a vehicle, comprising:

[0007] Performing field uniformity verification on the whole vehicle electromagnetic reverberation chamber to determine whether the field uniformity requirements are met within the target frequency band, wherein the vehicle under test in the whole vehicle electromagnetic reverberation chamber should be parked in the test area, and all electrical equipment not required for the test should be turned off;

[0008] Measuring the insertion loss of the electromagnetic reverberation chamber of the whole vehicle by using a vector network analyzer;

[0009] Performing a radiated emission test on the vehicle within the target frequency band, and receiving and recording test data using an EMI receiver;

[0010] The radiation transmission power and radiation field strength of the vehicle are calculated based on the test data and the insertion loss.

[0011] Optionally, the vehicle under test is parked at the center of a cubic workspace designed for the whole vehicle electromagnetic reverberation chamber, and all electrical equipment of the vehicle is turned off to put the vehicle in a pre-testing state.

[0012] Optionally, the step of verifying the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the field uniformity requirement is met within the target frequency band includes:

[0013] Using a transmitting antenna to inject a wireless interference signal into the electromagnetic reverberation chamber of the whole vehicle, and collecting the field strength data measured by the eight probes at each frequency point, wherein the field strength probes are arranged at eight vertex positions of the electromagnetic reverberation chamber of the whole vehicle;

[0014] The field uniformity is calculated based on the field strength data to determine whether the field uniformity requirement is met within the target frequency band.

[0015] Optionally, the step of measuring the insertion loss of the whole vehicle electromagnetic reverberation chamber by using a vector network analyzer includes:

[0016] Set the stirring paddle speed to the same speed as that used for field uniformity verification, and the transmitting antenna position to the same position;

[0017] Connecting the vector network analyzer with a transmitting antenna and a receiving antenna, and setting output power and a test frequency for the vector network analyzer;

[0018] During the test, the target parameters of the vector network analyzer are measured within the target frequency range using a maximum hold mode, and the stirrer completes at least one full rotation cycle;

[0019] After the test is completed, the measurement results of the vector network analyzer are read through a computer, and the insertion loss in the electromagnetic reverberation chamber of the whole vehicle is calculated based on the measurement results.

[0020] Optionally, the step of performing a radiation emission test on the vehicle within the target frequency band and receiving and recording test data using an EMI receiver includes:

[0021] When the vehicle is in a powered-on state, controlling the vehicle to run at a target speed, and simultaneously turning on all devices of the vehicle that can generate electromagnetic radiation, so that the vehicle operates at a maximum load state;

[0022] connecting a receiving antenna to the EMI receiver;

[0023] Using the peak detection method of the EMI receiver, the test data is read and recorded by a computer when the stirrer completes at least one complete rotation cycle.

[0024] Optionally, the step of calculating and deriving the radiation transmission power and radiation field strength of the vehicle based on the received test data includes:

[0025] Calculating the radiated transmission power of the vehicle based on the test data;

[0026] The vehicle is equivalent to a half-wave dipole antenna, and the radiation field intensity generated by the vehicle is obtained using a field intensity calculation formula based on the radiation transmission power.

[0027] In a second aspect, the present application provides a device for measuring high-frequency electromagnetic radiation of a vehicle, comprising:

[0028] A preparation module is used to verify the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the field uniformity requirement is met within the target frequency band, wherein the vehicle should be parked in the test area of ​​the whole vehicle electromagnetic reverberation chamber and all electrical equipment not required for the test should be turned off;

[0029] A measurement module, used to measure the insertion loss of the electromagnetic reverberation chamber of the whole vehicle by using a vector network analyzer;

[0030] Performing a radiated emission test on the vehicle within the target frequency band, and receiving and recording test data using an EMI receiver;

[0031] A processing module is used to calculate the radiation transmission power and radiation field strength of the vehicle based on the test data and the insertion loss.

[0032] Optionally, the vehicle under test is parked at the center of a cubic workspace designed for the whole vehicle electromagnetic reverberation chamber, and all electrical equipment of the vehicle is turned off to put the vehicle in a pre-testing state.

[0033] Optionally, the preparation module is further used to:

[0034] Using a transmitting antenna to inject a wireless interference signal into the electromagnetic reverberation chamber of the whole vehicle, and collecting the field strength data measured by the eight probes at each frequency point, wherein the field strength probes are arranged at eight vertex positions of the electromagnetic reverberation chamber of the whole vehicle;

[0035] The field uniformity is calculated based on the field strength data to determine whether the field uniformity requirement is met within the target frequency band.

[0036] Optionally, the measuring module is further used for:

[0037] Set the stirring paddle speed to the same speed as that used for field uniformity verification, and the transmitting antenna position to the same position;

[0038] Connecting the vector network analyzer with a transmitting antenna and a receiving antenna, and setting output power and a test frequency for the vector network analyzer;

[0039] During the test, the target parameters of the vector network analyzer are measured within the target frequency range using a maximum hold mode, and the stirrer completes at least one full rotation cycle;

[0040] After the test is completed, the measurement results of the vector network analyzer are read through a computer, and the insertion loss in the electromagnetic reverberation chamber of the whole vehicle is calculated based on the measurement results.

[0041] Optionally, the measuring module is further used for:

[0042] When the vehicle is in a powered-on state, controlling the vehicle to run at a target speed, and simultaneously turning on all devices of the vehicle that can generate electromagnetic radiation, so that the vehicle operates at a maximum load state;

[0043] connecting a receiving antenna to the EMI receiver;

[0044] Using the peak detection method of the EMI receiver, the test data is read and recorded by a computer when the stirrer completes at least one complete rotation cycle.

[0045] Optionally, the processing module is further used to:

[0046] Calculating the radiated transmission power of the vehicle based on the test data;

[0047] The vehicle is equivalent to a half-wave dipole antenna, and the radiation field intensity generated by the vehicle is obtained using a field intensity calculation formula based on the radiation transmission power.

[0048] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the above-mentioned methods for measuring high-frequency electromagnetic radiation of a vehicle.

[0049] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned methods for measuring high-frequency electromagnetic radiation of a vehicle.

[0050] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for measuring high-frequency electromagnetic radiation of a vehicle.

[0051] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0052] The present application provides a method, device, equipment, medium and product for measuring high-frequency electromagnetic radiation of a vehicle. The method and device for quickly measuring high-frequency electromagnetic radiation of a vehicle are performed by using an electromagnetic reverberation chamber. The statistically uniform electromagnetic environment generated by the chamber does not require receiving antenna scanning, which significantly shortens the test time and improves the test efficiency. The accuracy of the test results is ensured by field uniformity verification, and the insertion loss is quickly measured using a vector network analyzer, which further improves the measurement efficiency and accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A schematic flow chart of a method for measuring high-frequency electromagnetic radiation of a vehicle provided in one embodiment of the present application;

[0055] Figure 2 A schematic diagram of a layout for verifying the uniformity of a reverberation chamber field provided in one embodiment of the present application;

[0056] Figure 3 A schematic diagram of the arrangement of an insertion loss measurement device provided in one embodiment of the present application;

[0057] Figure 4 A schematic diagram of the arrangement of a radiation emission test device provided in one embodiment of the present application;

[0058] Figure 5 A schematic diagram of functional modules of a device for measuring high-frequency electromagnetic radiation of a vehicle provided in one embodiment of the present application;

[0059] Figure 6 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0061] like Figure 1As shown, some embodiments of the present application provide a method for measuring high-frequency electromagnetic radiation of a vehicle, which includes the following steps 101 to 104. Among them:

[0062] Step 101, verifying the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the target frequency band meets the field uniformity requirement, wherein the whole vehicle electromagnetic reverberation chamber is prevented from having a vehicle under test, and all electrical equipment not required for the test is turned off.

[0063] In an embodiment of the present application, before measuring the high-frequency electromagnetic radiation of the vehicle, it is first necessary to verify the field uniformity of the electromagnetic reverberation chamber of the whole vehicle. This is to ensure that the electromagnetic field formed in the reverberation chamber is statistically uniform, isotropic and randomly polarized, so as to meet the test requirements. The vehicle to be tested is parked in the tested area of ​​the reverberation chamber, all electrical equipment of the vehicle is turned off, and then field strength probes are arranged at the 8 vertices of the cubic workspace designed in the reverberation chamber. By injecting a wireless interference signal into the reverberation chamber and collecting the field strength data measured by 8 probes at each frequency point, the field uniformity is calculated according to the method specified in the ISO 11451-5 standard, and finally it is determined that the test frequency band meets the field uniformity requirements. Field uniformity is an important parameter for subsequent radiated emission tests because it ensures the accuracy and reliability of the test results.

[0064] When conducting field uniformity verification and subsequent radiation emission tests, the vehicle under test needs to be placed in the vehicle electromagnetic reverberation chamber. At the same time, in order to ensure the accuracy of the test results, all non-test-essential electrical devices on the vehicle need to be turned off. This is to reduce the impact of electromagnetic interference generated by these devices on the test results.

[0065] Specifically, refer to Figure 2 , the vehicle under test can be parked in the tested area and all electrical equipment of the vehicle can be turned off. Field strength probes are arranged at the 8 vertices of the cubic workspace designed in the reverberation chamber. According to the maximum speed of each stirring paddle in the reverberation chamber, a reasonable rated working speed of the stirring paddle is set. The faster the speed, the shorter the test time. At the same time, a transmitting antenna is used to inject wireless interference signals into the reverberation chamber. The holding time of each frequency point is the time required for the stirring paddle with the largest size in the reverberation chamber to rotate one circle. Collect the field strength data measured by 8 probes at each frequency point, and then calculate the field uniformity according to the method specified in the ISO 11451-5 standard to determine the frequency band that meets the field uniformity requirements of the ISO 11451-5 standard.

[0066] Step 102: Use a vector network analyzer to measure the insertion loss of the electromagnetic reverberation chamber of the whole vehicle.

[0067] In the embodiment of the present application, insertion loss is an important indicator of the performance of the reverberation chamber, which indicates the reduction in signal strength due to various factors (such as reflection, scattering, etc.) when the signal passes through the reverberation chamber.

[0068] The insertion loss of the reverberation chamber can be quickly measured using a vector network analyzer. The vector network analyzer has the characteristics of fast frequency sweep, which can greatly reduce the measurement time. During the measurement process, the vehicle to be tested needs to be parked in the test area, all electrical equipment needs to be turned off, and the reasonable rated speed of the stirring paddle and the position of the transmitting antenna need to be set. Then, the S21 parameter between the transmitting antenna and the receiving antenna is measured by the vector network analyzer, and the insertion loss of the reverberation chamber is calculated using the relevant formula.

[0069] Specifically, refer to Figure 3 The insertion loss is measured using a vector network analyzer. The fast frequency sweep feature of the vector network analyzer can greatly reduce the measurement time. The vehicle to be tested is parked in the test area and all electrical devices in the vehicle are turned off. The speed of the stirring paddle is the same as that during the field uniformity verification. The position of the transmitting antenna is the same as that during the field uniformity verification, and the receiving antenna is placed in the test area.

[0070] Port 1 of the vector network analyzer is connected to the transmitting antenna through an RF cable, and port 2 is connected to the receiving antenna through an RF cable. The frequency point and step length to be measured are determined according to the test needs. The scanning frequency range should be within the frequency band of the transmitting antenna and the receiving antenna. Set the appropriate output power P of the vector network analyzer output , the output power of the transmitting antenna should be higher than the ambient noise floor. During the test, the maximum hold mode is used to measure the S21 parameter of the vector network analyzer in the target frequency range. The stirrer should complete at least one full rotation cycle so that the vector network analyzer can capture the peak power from the receiving antenna in the selected frequency range. After the test is completed, the measurement results of the vector network analyzer are read by a computer, and the insertion loss in the reverberation chamber is calculated using formulas (1) and (2).

[0071] P Receive =10+S 21 (1)

[0072] Insert_Loss=(P output -L output_loss )+(10log(σ))-P Receive (2)

[0073] Among them, P Receive is the power received by port2 at the corresponding frequency, in dBm. Insert_Loss is the insertion loss in the reverberation chamber, in dB. outputis the output power of the vector network analyzer, in dBm. output_loss is the cable loss at the corresponding frequency from port 1 to the transmitting antenna, in dB. σ is the antenna efficiency of the transmitting antenna (0.75 for log-periodic antenna and 0.9 for horn antenna).

[0074] The insertion loss of the cabin must be remeasured each time a different vehicle is measured. The insertion loss and radiated emission measurements must use the same receiving antenna, transmitting antenna, and RF cable. The antenna positions must remain unchanged.

[0075] Step 103: Perform a radiation emission test on the vehicle within the target frequency band, and use an EMI receiver to receive and record test data.

[0076] In the embodiment of the present application, after determining that the uniformity of the reverberation chamber field in the test frequency band meets the requirements, the vehicle can be tested for radiation emission. During the test, the vehicle should be powered on and the speed should be controlled within the specified range (such as about 40km / h). At the same time, all equipment that can generate electromagnetic radiation and work for a long time should be turned on to operate at maximum load.

[0077] During the test, the EMI receiver is used to receive and record the test data. The EMI receiver has a peak detection function and sets the displayed data to the maximum hold mode. The boundary conditions of the reverberation chamber are changed by the rotation of the stirrer, so that a statistically uniform, isotropic and randomly polarized electromagnetic environment is formed in the chamber. During the test, at least one complete stirring cycle should be completed so that the EMI receiver can capture the peak power from the receiving antenna in the selected frequency range.

[0078] Specifically, refer to Figure 4 The radiated emission of the reverberation chamber measures the radiated power of the vehicle. The radiated power of the vehicle is attenuated by the insertion loss of the cabin and then received by the receiving antenna. Therefore, the total radiated emission power of the vehicle is the sum of the radiated emission power (dBm) of the vehicle measured at each measurement frequency and the insertion loss (dB) of the reverberation chamber.

[0079] During the test, the stirring paddle speed is the same as that during field uniformity verification and insertion loss measurement. The vehicle is powered on and the vehicle speed is controlled at about 40km / h. All equipment that can generate electromagnetic radiation and work for a long time should be turned on and made to work at the maximum load state. For specific working conditions, please refer to the requirements for vehicle status in GB 34660 standard.

[0080] Connect the receiving antenna to the EMI receiver using the same RF cable used to measure the insertion loss. Disconnect the RF cable between the transmitting antenna and the vector network analyzer and connect the RF cable with a 50Ω load impedance. Use the peak detection method of the EMI receiver and set the displayed data to the maximum hold mode. The stirrer completes at least one full rotation cycle so that the EMI receiver captures the peak power from the receiving antenna in the selected frequency range. There should be at least 200 scans in one stirring cycle. Read the measurement results of the vector network analyzer on a computer

[0081] Step 104: Calculate the radiation transmission power and radiation field strength of the vehicle based on the test data and the insertion loss.

[0082] In the embodiment of the present application, the radiation transmission power and radiation field strength of the vehicle can be calculated based on the test data and the insertion loss. The radiation transmission power indicates the power of the electromagnetic radiation generated by the vehicle, while the radiation field strength indicates the strength of the electric field or magnetic field formed in space by the electromagnetic radiation generated by the vehicle. By calculating the radiation transmission power and considering the influence of the insertion loss, the radiation field strength value of the vehicle in the actual environment can be obtained.

[0083] Specifically, after the measurement is completed, the radiated emission power of the vehicle is calculated using the following formula (3):

[0084]

[0085] Where P is the total radiated power of the vehicle at a given frequency, in W; P Receive is the maximum power received by the receiving antenna, in dBm; Insert_loss is the calculated insertion loss, in dB.

[0086] The field strength calculation formula is as follows (4):

[0087]

[0088] Where E is the calculated radiation field strength generated by the vehicle, in V / m; P is the total radiation emission power of the vehicle, in W; α is the inherent impedance of free space, approximately equal to 377Ω; R is the distance to the vehicle under test, in m.

[0089] The embodiment of the present application uses an electromagnetic reverberation chamber to perform a method and device for quickly measuring a vehicle's high-frequency electromagnetic radiation. Through the statistically uniform electromagnetic environment generated by the electromagnetic reverberation chamber, there is no need to change the position of the receiving antenna relative to the vehicle, which significantly shortens the test time and improves the test efficiency. The accuracy of the test results is ensured by field uniformity verification, and the insertion loss is quickly measured using a vector network analyzer, further improving the measurement efficiency and accuracy.

[0090] Optionally, the vehicle under test is parked at the center of a cubic workspace designed for the whole vehicle electromagnetic reverberation chamber, and all electrical equipment of the vehicle is turned off to put the vehicle in a pre-testing state.

[0091] In the embodiment of the present application, the vehicle under test needs to be parked in the center of the cubic workspace of the vehicle electromagnetic reverberation chamber design. This is because the reverberation chamber is designed to produce a statistically uniform, isotropic and randomly polarized electromagnetic environment inside it. Parking the vehicle in the center ensures that the vehicle is in the best position in this uniform electromagnetic field, thereby obtaining more accurate test results.

[0092] Before the test, the vehicle under test needs to turn off all electrical equipment. This is to ensure that during the test, the vehicle's electromagnetic radiation only comes from its own electromagnetic characteristics and is not affected by electromagnetic interference from other electrical equipment. Turning off electrical equipment helps reduce test errors and improve test accuracy.

[0093] By parking the vehicle under test in a designated location and turning off all electrical devices, the vehicle is ready for testing. This step is an important part of the test process, as it ensures the consistency and repeatability of the test conditions and provides a good foundation for subsequent test steps.

[0094] Optionally, step 101 includes:

[0095] Step 1011, using a transmitting antenna to inject a wireless interference signal into the electromagnetic reverberation chamber of the whole vehicle, and collecting field strength data measured by the eight probes at each frequency point, wherein the field strength probes are arranged at eight vertex positions of the electromagnetic reverberation chamber of the whole vehicle.

[0096] Step 1012: Calculate field uniformity based on the field strength data and determine a target frequency band required by standard field uniformity.

[0097] In an embodiment of the present application, in the preparation stage of the electromagnetic reverberation chamber test of the whole vehicle, it is necessary to use a transmitting antenna to inject wireless interference signals into the reverberation chamber. These signals cover a series of frequency points and are used to simulate and evaluate the electromagnetic field distribution in the reverberation chamber. These probes can measure and record the field strength data at each frequency point. Since the reverberation chamber is usually designed in a cubic shape, the layout of 8 vertices can provide a comprehensive, three-dimensional electromagnetic field distribution evaluation.

[0098] After collecting the measurement data of 8 field strength probes at each frequency point, it is necessary to calculate according to the method specified in the ISO 11451-5 standard to evaluate the field uniformity in the reverberation chamber. It is key to ensure that the reverberation chamber can provide a statistically uniform, isotropic and randomly polarized electromagnetic environment within a specific frequency band. Based on the calculated field uniformity data, the frequency bands that meet the standard field uniformity requirements can be determined. These frequency bands are the basis for subsequent vehicle radiated emission tests to ensure the accuracy and reliability of the test results.

[0099] Optionally, the step 102 includes:

[0100] Step 1021, setting the stirring blade speed to be the same as the speed during field uniformity verification, and the transmitting antenna position is the same.

[0101] In the embodiment of the present application, when performing insertion loss measurement, the speed of the stirring paddle is set to be the same as the speed during field uniformity verification. This is to ensure the consistency of the test conditions, so as to accurately evaluate the impact of the electromagnetic environment in the reverberation chamber on the measurement results.

[0102] At the same time, the position of the transmitting antenna is the same as that during the field uniformity verification. This setting helps to maintain the stability and repeatability of the test environment and further improve the accuracy of the measurement results.

[0103] Step 1022, connecting the vector network analyzer with a transmitting antenna and a receiving antenna, and setting output power and a test frequency for the vector network analyzer.

[0104] In the embodiment of the present application, the vector network analyzer is a key device for measuring the insertion loss. Before the test, the vector network analyzer needs to be connected to the transmitting antenna and the receiving antenna.

[0105] Next, set the appropriate output power and test frequency for the vector network analyzer. The output power should ensure that the output power of the transmitting antenna is higher than the ambient noise floor to ensure the accuracy of the measurement; and the test frequency is set according to the test requirements.

[0106] Step 1023, during the test, the target parameters of the vector network analyzer within the target frequency range are measured using the maximum hold mode, and the stirrer completes at least one full rotation cycle.

[0107] In the embodiment of the present application, during the test, the maximum hold mode is used to measure the S21 parameter (ie, the transmission coefficient) of the vector network analyzer within the target frequency range. This parameter reflects the signal transmission efficiency from the transmitting antenna to the receiving antenna and is a key data for calculating the insertion loss.

[0108] At the same time, the stirrer completes at least one full rotation cycle. This is to ensure that the electromagnetic environment in the reverberation chamber is fully mixed during the measurement process, thereby obtaining more accurate measurement results.

[0109] Step 1024, after the test is completed, the measurement result of the vector network analyzer is read through a computer, and the insertion loss in the electromagnetic reverberation chamber of the whole vehicle is calculated based on the measurement result.

[0110] In the embodiment of the present application, after the test is completed, the measurement results of the vector network analyzer are read by a computer, and these results include the S21 parameter values ​​measured at different frequency points.

[0111] Based on these measurement results, the insertion loss of the vehicle electromagnetic reverberation chamber can be calculated. Insertion loss is one of the important indicators for evaluating the performance of the reverberation chamber, which reflects the attenuation degree of the reverberation chamber to the electromagnetic signal.

[0112] Optionally, the step 103 includes:

[0113] Step 1031, when the vehicle is in a powered-on state, controlling the vehicle to run at a target speed, and simultaneously turning on all devices of the vehicle that can generate electromagnetic radiation, so that the vehicle operates at a maximum load state.

[0114] In the embodiment of the present application, first, the vehicle is powered on to start the vehicle's electrical system in preparation for subsequent testing. The vehicle is controlled to run at a predetermined target speed. The operating state of the vehicle in actual use is simulated to more accurately assess its electromagnetic radiation level. All devices on the vehicle that can generate electromagnetic radiation, such as the engine, motor, electronic control unit (ECU), etc., are turned on, and the vehicle is operated at maximum load. This is to stimulate the maximum potential of the vehicle's electromagnetic radiation and ensure that the test can cover all possible radiation sources.

[0115] Step 1032, connecting the receiving antenna to the EMI receiver.

[0116] In the embodiment of the present application, the receiving antenna is connected to an EMI (electromagnetic interference) receiver. The receiving antenna is used to capture electromagnetic radiation signals generated by the vehicle, and the EMI receiver is responsible for receiving and processing these signals.

[0117] Step 1033, using the peak detection method of the EMI receiver, read and record the test data through a computer when the stirrer completes at least one complete rotation cycle.

[0118] In the embodiment of the present application, the peak detection method of the EMI receiver is used. The peak detection method can capture the maximum value in the signal, which is very useful for evaluating the intensity of electromagnetic radiation.

[0119] The test data is read and recorded by the computer when the stirrer completes at least one complete rotation cycle. The rotation of the stirrer is to make the electromagnetic field in the reverberation chamber more uniform, thereby ensuring the accuracy of the test results. During the rotation of the stirrer, the measurement data of the EMI receiver is continuously read and recorded for subsequent analysis and processing.

[0120] Optionally, the step 104 includes:

[0121] Step 1041, calculating the radiation transmission power of the vehicle based on the test data.

[0122] Step 1042: Equivalently treat the vehicle as a half-wave dipole antenna, and use a field strength calculation formula based on the radiation transmission power to obtain the radiation field strength generated by the vehicle.

[0123] In the embodiment of the present application, after completing the electromagnetic radiation test on the vehicle, we obtained a series of test data. These data reflect the intensity of electromagnetic radiation generated by the vehicle at different frequencies. Based on these test data, we can calculate the radiation emission power of the vehicle. The radiation emission power is a physical quantity that describes the ability of an electromagnetic radiation source (in this case, the vehicle) to emit electromagnetic energy. It is usually expressed as the electromagnetic energy emitted per unit time, and the unit may be watts (W) or milliwatts (mW), etc. The method for calculating the radiation emission power may involve processing and analysis of the test data, including filtering, calibration, correction and other steps to ensure accurate results.

[0124] In order to simplify the problem and facilitate calculation, we equate the vehicle to a half-wave dipole antenna. A half-wave dipole antenna is a simple antenna model whose length is equal to half the wavelength of the electromagnetic wave and whose two ends are open. This equivalence is a common method based on electromagnetic field theory and antenna theory. By simplifying the complex vehicle structure into a simple antenna model, we can more easily analyze and calculate the electromagnetic radiation field strength generated by the vehicle.

[0125] After obtaining the radiated transmission power of the vehicle, we can use the field strength calculation formula to calculate the radiated field strength generated by the vehicle. The field strength calculation formula is usually based on the basic theory of electromagnetic fields, such as Maxwell's equations. For half-wave dipole antennas, there are specific field strength calculation formulas that can be used. These formulas take into account factors such as the size, shape, radiated transmission power of the antenna, and the propagation characteristics of electromagnetic waves in space. Substituting the radiated transmission power of the vehicle into the field strength calculation formula and considering other relevant parameters (such as distance, frequency, etc.), we can calculate the radiated field strength generated by the vehicle at different locations. This result is of great significance for evaluating the electromagnetic compatibility of vehicles, determining safe distances, and formulating relevant standards.

[0126] Based on the same inventive concept, the embodiment of the present application also provides a device for measuring vehicle high-frequency electromagnetic radiation for implementing the above-mentioned method for measuring vehicle high-frequency electromagnetic radiation. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of one or more vehicle high-frequency electromagnetic radiation measuring devices provided below can refer to the limitations of the vehicle high-frequency electromagnetic radiation measuring method above, and will not be repeated here.

[0127] In an exemplary embodiment, Figure 5 As shown, a device 20 for measuring high-frequency electromagnetic radiation of a vehicle is provided, comprising:

[0128] Preparation module 201, used to verify the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the target frequency band meets the field uniformity requirement, wherein the vehicle under test in the whole vehicle electromagnetic reverberation chamber is parked in the test area, and all electrical devices not required for the test are turned off;

[0129] A measuring module 202 is used to measure the insertion loss of the electromagnetic reverberation chamber of the whole vehicle by using a vector network analyzer;

[0130] Performing a radiated emission test on the vehicle within the target frequency band, and receiving and recording test data using an EMI receiver;

[0131] The processing module 203 is used to calculate the radiation transmission power and radiation field strength of the vehicle based on the test data and the insertion loss.

[0132] Optionally, the vehicle under test is parked at the center of a cubic workspace designed for the whole vehicle electromagnetic reverberation chamber, and all electrical equipment of the vehicle is turned off to put the vehicle in a pre-testing state.

[0133] Optionally, the preparation module 201 is further used for:

[0134] Using a transmitting antenna to inject a wireless interference signal into the electromagnetic reverberation chamber of the whole vehicle, and collecting the field strength data measured by the eight probes at each frequency point, wherein the field strength probes are arranged at eight vertex positions of the electromagnetic reverberation chamber of the whole vehicle;

[0135] The field uniformity is calculated based on the field strength data to determine whether the field uniformity requirement is met within the target frequency band.

[0136] Optionally, the measuring module 202 is further configured to:

[0137] Set the stirring paddle speed to the same speed as that used for field uniformity verification, and the transmitting antenna position to the same position;

[0138] Connecting the vector network analyzer with a transmitting antenna and a receiving antenna, and setting output power and a test frequency for the vector network analyzer;

[0139] During the test, the target parameters of the vector network analyzer are measured within the target frequency range using a maximum hold mode, and the stirrer completes at least one full rotation cycle;

[0140] After the test is completed, the measurement results of the vector network analyzer are read through a computer, and the insertion loss in the electromagnetic reverberation chamber of the whole vehicle is calculated based on the measurement results.

[0141] Optionally, the measuring module 202 is further configured to:

[0142] When the vehicle is in a powered-on state, controlling the vehicle to run at a target speed, and simultaneously turning on all devices of the vehicle that can generate electromagnetic radiation, so that the vehicle operates at a maximum load state;

[0143] connecting a receiving antenna to the EMI receiver;

[0144] Using the peak detection method of the EMI receiver, the test data is read and recorded by a computer when the stirrer completes at least one complete rotation cycle.

[0145] Optionally, the processing module 203 is further configured to:

[0146] Calculating the radiated transmission power of the vehicle based on the test data;

[0147] The vehicle is equivalent to a half-wave dipole antenna, and the radiation field intensity generated by the vehicle is obtained using a field intensity calculation formula based on the radiation transmission power.

[0148] The embodiments of the present application use a method and device for quickly measuring high-frequency electromagnetic radiation of a vehicle by utilizing an electromagnetic reverberation chamber. The statistically uniform electromagnetic environment generated by the chamber eliminates the need for receiving antenna scanning, significantly shortens the test time, improves the test efficiency, and ensures the accuracy of the test results through field uniformity verification. At the same time, a vector network analyzer is used to quickly measure the insertion loss, further improving the measurement efficiency and accuracy.

[0149] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 6As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store measurement data of high-frequency electromagnetic radiation of vehicles. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for measuring high-frequency electromagnetic radiation of a vehicle is implemented.

[0150] Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0151] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0152] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0153] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0154] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0155] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0156] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0157] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0158] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for measuring high-frequency electromagnetic radiation of a vehicle, characterized in that: The method for measuring high-frequency electromagnetic radiation of a vehicle comprises: Verify the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the target frequency band meets the field uniformity requirements. The vehicle under test in the whole vehicle electromagnetic reverberation chamber must be parked in the test area, and all electrical equipment not required for the test must be turned off. Measuring the insertion loss of the electromagnetic reverberation chamber of the whole vehicle by using a vector network analyzer; Performing a radiated emission test on the vehicle within the target frequency band, and receiving and recording test data using an EMI receiver; The radiation transmission power and radiation field strength of the vehicle are calculated based on the test data and the insertion loss.

2. The method for measuring high-frequency electromagnetic radiation of a vehicle according to claim 1, characterized in that: The vehicle under test is parked at the center of the cubic workspace designed for the whole vehicle electromagnetic reverberation chamber, and all electrical equipment of the vehicle is turned off to put the vehicle in a pre-testing state.

3. The method for measuring high-frequency electromagnetic radiation of a vehicle according to claim 1, characterized in that: The step of verifying the field uniformity of the whole vehicle electromagnetic reverberation chamber to determine whether the field uniformity requirement is met within the target frequency band includes: Using a transmitting antenna to inject a wireless interference signal into the electromagnetic reverberation chamber of the whole vehicle, and collecting field strength data measured by 8 field strength probes at each frequency point, where the field strength probes are arranged at 8 vertex positions of the electromagnetic reverberation chamber of the whole vehicle; The field uniformity is calculated based on the field strength data to determine whether the field uniformity requirement is met within the target frequency band.

4. The method for measuring high-frequency electromagnetic radiation of a vehicle according to claim 1, characterized in that: The step of measuring the insertion loss of the vehicle electromagnetic reverberation chamber by using a vector network analyzer comprises: Set the stirring paddle speed to the same speed as that used for field uniformity verification, and the transmitting antenna position to the same position; Connecting the vector network analyzer with a transmitting antenna and a receiving antenna, and setting output power and a test frequency for the vector network analyzer; During the test, the target parameters of the vector network analyzer are measured within the target frequency range using a maximum hold mode, and the stirrer completes at least one full rotation cycle; After the test is completed, the measurement results of the vector network analyzer are read through a computer, and the insertion loss in the electromagnetic reverberation chamber of the whole vehicle is calculated based on the measurement results.

5. The method for measuring high-frequency electromagnetic radiation of a vehicle according to claim 1, characterized in that: The step of performing a radiation emission test on the vehicle within the target frequency band and using an EMI receiver to receive and record test data comprises: When the vehicle is in a powered-on state, controlling the vehicle to run at a target speed, and simultaneously turning on all devices of the vehicle that can generate electromagnetic radiation, so that the vehicle operates at a maximum load state; connecting a receiving antenna to the EMI receiver; Using the peak detection method of the EMI receiver, the test data is read and recorded by a computer when the stirrer completes at least one complete rotation cycle.

6. The method for measuring high-frequency electromagnetic radiation of a vehicle according to claim 1, characterized in that: The step of calculating and obtaining the radiation transmission power and radiation field strength of the vehicle based on the received test data includes: Calculating the radiated transmission power of the vehicle based on the test data; The vehicle is equivalent to a half-wave dipole antenna, and the radiation field intensity generated by the vehicle is obtained using a field intensity calculation formula based on the radiation transmission power.

7. A device for measuring high-frequency electromagnetic radiation of a vehicle, characterized in that: The device for measuring high-frequency electromagnetic radiation of a vehicle comprises: A preparation module is used to verify the field uniformity of the whole vehicle electromagnetic reverberation chamber and determine whether the field uniformity requirements are met within the target frequency band, wherein the vehicle under test in the whole vehicle electromagnetic reverberation chamber should be parked within the tested area, and all electrical equipment not required for the test should be turned off; A measurement module, used to measure the insertion loss of the electromagnetic reverberation chamber of the whole vehicle using a vector network analyzer; Performing a radiated emission test on the vehicle within the target frequency band, and receiving and recording test data using an EMI receiver; A processing module is used to calculate the radiation transmission power and radiation field strength of the vehicle based on the test data and the insertion loss.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for measuring high-frequency electromagnetic radiation of a vehicle according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for measuring high-frequency electromagnetic radiation of a vehicle according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for measuring high-frequency electromagnetic radiation of a vehicle according to any one of claims 1 to 6 are implemented.

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