A vehicle electromagnetic radiation anti-interference performance test method and control computer

Abstract

The present application belongs to the technical field of vehicle electromagnetic compatibility test, and particularly relates to a vehicle electromagnetic radiation anti-interference performance test method and a control computer, a test system is configured and test parameters are set; a forward power level required for single frequency point point-by-point calibration to reach an expected field strength is achieved, a frequency reference level database is established; frequency points are grouped, calibration data is called to generate multiple carriers, a uniform phase offset is applied for linear superposition to generate a multiple frequency carrier phase shift combination signal; the combination signal is modulated, amplified, converted into a composite electromagnetic field by an antenna and applied to the vehicle; frequency point groups are switched until full-band test is completed, and data is summarized to determine the anti-interference performance. The method realizes multiple frequency point synchronous parallel test through multiple frequency carrier phase shift technology, and improves test efficiency. The superposition state of multiple carriers is regulated and controlled through preset phase offset, which can effectively avoid power amplifier saturation distortion and field strength exceeding caused by in-phase superposition of multiple frequency signals, and ensure amplitude stability of the multiple frequency composite signal.

Description

Technical Field

[0001] This invention belongs to the field of vehicle electromagnetic compatibility (EMC) testing technology, specifically relating to a test method and control computer for vehicle electromagnetic radiation anti-interference performance based on multi-frequency carrier phase shifting technology. Background Technology

[0002] With the rapid development of automotive intelligence, electrification, and connectivity technologies, the number of electronic devices such as vehicle radar, autonomous driving controllers, high-voltage electronic control systems, and vehicle communication modules has increased significantly. This has led to increasingly complex electromagnetic interference in the vehicle operating environment, with frequent occurrences of multi-frequency superimposed electromagnetic interference scenarios. The vehicle's electromagnetic radiation immunity directly determines the overall vehicle safety and the stability of its electronic systems, and is a key indicator for vehicle factory testing and compliance certification.

[0003] Currently, the electromagnetic radiation immunity test of vehicles in the industry adopts the single-frequency point-by-point test mode and follows the test standard. During the test, the vector signal generator outputs the frequency interference signal. After completing the single frequency point dwell test, the test process is repeated with the next frequency point until the full frequency band test is completed.

[0004] The test method has a large number of frequency points in the full frequency band from 10kHz to 18GHz, and the dwell time of a single frequency point is long. The complete vehicle radiation immunity test is time-consuming and cannot meet the needs of car companies for mass production testing.

[0005] The single-frequency independent test mode simulates electromagnetic interference of a certain frequency, but it cannot reproduce the complex working conditions of multiple electromagnetic interference superimposed during actual vehicle operation. The test environment deviates significantly from the real application scenario, resulting in incomplete testing and missed detections. Summary of the Invention

[0006] This invention provides a method for testing the electromagnetic radiation immunity performance of vehicles. It utilizes multi-frequency carrier phase-shifting technology to achieve parallel testing at multiple frequency points, improving testing efficiency. Phase shift adjustment avoids signal distortion and ensures field strength accuracy. The superposition of multiple frequencies into composite signals realistically simulates complex electromagnetic environments, improving fault detection rates.

[0007] The methods include: S1: Construct an experimental system consisting of a vector signal generator, power amplifier, transmitting antenna, field strength monitoring system, and vehicle data acquisition system; set experimental parameters such as target test field strength, dwell time, polarization mode, and frequency range; S2: The vector signal generator is controlled to use a single-frequency-point mode, outputting signals point by point within the test frequency band. The field strength monitoring system provides real-time feedback and iteratively adjusts the output level of the vector signal generator until the target test field strength is reached. The reference output level of the vector signal generator corresponding to each frequency point is recorded to establish frequency-reference level calibration data. S3: Divide the test frequency band into several frequency point combinations; retrieve the frequency-reference level calibration data established in step S2, and obtain the reference output level corresponding to each frequency point; control the vector signal generator to generate multiple carrier signals, and apply a preset phase offset to each carrier signal; linearly superimpose the multiple carrier signals after applying the phase offset to generate a multi-frequency carrier phase-shifted combination signal; S4: Modulate the multi-frequency carrier phase-shifting combination signal to generate a modulated combination signal; input the modulated combination signal into a power amplifier for amplification to output a high-power multi-frequency carrier composite signal; convert the high-power multi-frequency carrier composite signal into an electromagnetic field through a transmitting antenna and apply it to the vehicle under test. S5: During the application of the electromagnetic field, the vehicle data acquisition system is used to monitor and record the working status, bus messages and fault information of each electronic control unit of the vehicle under test in real time. S6: Switch to the next frequency combination and repeat steps S3 to S5 until all frequency combinations are tested; summarize all test data and evaluate the vehicle's electromagnetic radiation anti-interference performance according to the preset failure judgment criteria.

[0008] According to another embodiment of this application, a control computer is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the vehicle electromagnetic radiation anti-interference performance test method.

[0009] As can be seen from the above technical solutions, the present invention has the following advantages: This invention employs single-frequency point-by-point field strength calibration to establish a precise frequency-level database, ensuring accurate and controllable radiated field strength at each test frequency, and meeting industry standard requirements for test precision. Multi-frequency carrier phase-shifting technology enables synchronous parallel testing at multiple frequency points, improving testing efficiency across the entire frequency band. Applying a uniform phase shift to the carrier at each frequency point disperses the peak values ​​of multiple signals along the time axis, resulting in a composite signal whose instantaneous peak amplitude is significantly lower than the sum of the peak values ​​of each signal, effectively solving the problems of power amplifier saturation distortion and excessive field strength caused by multi-frequency in-phase superposition. The multi-frequency superimposed composite signal directly recreates the real operating conditions of multi-band electromagnetic interference coexisting and superimposed coupling in actual vehicle driving environments, compensating for incomplete testing and missed detections. Attached Figure Description

[0010] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 Flowchart of the test method for vehicle electromagnetic radiation immunity performance; Figure 2 Schematic diagram of a vehicle electromagnetic radiation immunity test field strength calibration system; Figure 3 This is a schematic diagram of frequency grouping; Figure 4 This is a schematic diagram of the multi-frequency carrier phase-shifting combination signal generation process; Figure 5 Schematic diagram of a vehicle electromagnetic radiation immunity test system; Figure 6 A schematic diagram for controlling a computer. Detailed Implementation

[0012] The vehicle electromagnetic radiation anti-interference performance test method provided by this invention involves building a test platform including a vector signal generator, power amplifier, transmitting antenna, field strength monitoring, and vehicle data acquisition system, and setting parameters such as test field strength, dwell time, polarization mode, and frequency range. First, a single-frequency-point mode is used to output signals point by point, and the frequency-reference level calibration data is established through real-time feedback and adjustment via field strength monitoring. Then, the test frequency band is divided into several frequency point combinations. Based on the calibration data, multiple carrier signals are generated and linearly superimposed after applying a preset phase offset to form a multi-frequency carrier phase-shifted combination signal. After modulation and power amplification, the signal is converted into an electromagnetic field by the transmitting antenna and applied to the vehicle under test. Simultaneously, the operating status of each ECU, bus messages, and fault information are collected in real time. After completing the test of all frequency point combinations, the vehicle's electromagnetic radiation anti-interference performance is evaluated according to the failure judgment criteria.

[0013] While retaining the advantages of traditional precise field strength calibration and ensuring that the test results meet industry standards, the method uses multi-frequency carrier phase-shifting composite signal technology to achieve synchronous parallel testing at multiple frequency points, thereby improving test efficiency and simulating a real electromagnetic interference environment with multiple frequencies superimposed.

[0014] The following will describe in detail the vehicle electromagnetic radiation anti-interference performance test method involved in this application. Specific details such as particular system structures and technologies are presented for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can also be implemented in other embodiments without these specific details.

[0015] It should be understood that, when used in this specification, the term "comprising" indicates the presence of the described feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0016] The terms "one embodiment" or "some embodiments" used in this application mean that one or more embodiments of this application include the specific features, structures, or characteristics described in that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this application do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized.

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 The diagram shows a flowchart of a vehicle electromagnetic radiation anti-interference performance test method in a specific embodiment. The method includes: S1: Construct an experimental system consisting of a vector signal generator, power amplifier, transmitting antenna, field strength monitoring system, and vehicle data acquisition system; set experimental parameters such as target test field strength, dwell time, polarization mode, and frequency range.

[0019] In some embodiments, the operator connects the vector signal generator, power amplifier, and transmitting antenna sequentially according to the device connection information generated by the control computer. A directional coupler is inserted in series on the RF cable between the power amplifier output and the transmitting antenna. The main path of the directional coupler is connected to the RF cable for signal transmission, and the coupling ports are connected to a forward power probe and a reverse power probe, respectively. The coupling direction of the forward power probe is towards the transmitting antenna to sample the forward transmitted power, and the coupling direction of the reverse power probe is towards the power amplifier to sample the reflected power.

[0020] It should be noted that the field strength monitoring system is a measurement system consisting of a field strength probe and a field strength monitoring system. The field strength probe is connected to the field strength monitoring system via an optical fiber link. The dipole antenna inside the probe senses the spatial electric field, generating an induced voltage proportional to the field strength. This voltage is converted into a DC voltage signal by a detector circuit, then into a digital signal by an analog-to-digital converter, and finally into an optical signal by an electro-optical converter, transmitted via optical fiber to the field strength monitoring system. This provides measured data for the field strength calibration process in step S2.

[0021] Provide measured data and continuously monitor whether the field strength remains at the target level during the experiment in step S4. Optionally, use four probes placed at different locations in the test area and take the average value.

[0022] The vehicle data acquisition system is an integrated system consisting of a vehicle signal monitoring device, an audio and video monitoring device, and a data acquisition terminal. The vehicle data acquisition system is also used to synchronously monitor the operating status of modules such as the vehicle's power battery, motor controller, in-vehicle central control system, autonomous driving system, air conditioning system, instrument cluster, vehicle speed, and lights during the execution of step S5, and to record in real time whether any faults such as system crashes, errors, packet loss, or abnormal power occur.

[0023] The target test field strength refers to the electric field strength value that needs to be achieved in the vehicle test area as specified in the test standard or test plan. In this embodiment, the target test field strength is set to 30V / m, 50V / m, 100V / m, or other values ​​according to test requirements. In step S2, during the field strength calibration process, the control computer compares the measured field strength with the target test field strength as the convergence target for iterative adjustment, calculates the deviation, and adjusts the output level of the vector signal generator until the measured field strength reaches the target value. In step S4, during the test process, the target field strength serves as a reference benchmark for field strength monitoring, ensuring that the electromagnetic interference field strength applied to the vehicle accurately meets the standard.

[0024] Dwell time refers to the shortest duration, measured in seconds, of continuously applying an interference field strength at each test frequency. The standard stipulates that the dwell time should not be shorter than the time required for the electronic control unit of the vehicle under test to operate and respond.

[0025] The dwell time ensures that the vehicle's electronic control unit has sufficient time to fully observe and record its response to electromagnetic interference. Optionally, the dwell time is set to at least 1 second. The control computer starts the dwell time when the electromagnetic field is applied in step S4, continuously applies interference and synchronously collects vehicle data before the timer reaches zero, and stops the test group and saves the data after the timer reaches zero.

[0026] Polarization refers to the direction of the electric field vector of the electromagnetic wave radiated by the transmitting antenna. The radiation characteristics and spatial field distribution of the transmitting antenna differ under different polarizations, and the field strength values ​​generated by the same vector signal generator output level differ under the two polarizations. Optionally, a preset polarization is used; in step S2, independent calibration data are established for horizontal and vertical polarization respectively; and in step S4, the corresponding radiating element is selected according to the set polarization.

[0027] The frequency range refers to the entire frequency band covered by the test, from the starting frequency to the ending frequency. Different frequency bands use different frequency step values. The step value is smaller for low-frequency bands to ensure frequency resolution, and larger for high-frequency bands to reduce the number of test points. In this embodiment, step S1 sets the starting frequency, ending frequency, and frequency step value, and step S3 divides the entire frequency band into several groups of frequency points accordingly to achieve multi-frequency parallel testing.

[0028] The reference output level of the vector signal generator refers to the power level setting value of the current output port of the vector signal generator when the measured field strength reaches the target test field strength value during the field strength calibration process in step S2. It can be used as the amplitude basis for generating multi-frequency combined signals. The control computer writes the above parameters into the system configuration area.

[0029] S2: The vector signal generator is controlled to use a single-frequency-point mode, outputting signals point by point within the test frequency band. The field strength monitoring system provides real-time feedback and iteratively adjusts the output level of the vector signal generator until the target test field strength is reached. The reference output level of the vector signal generator corresponding to each frequency point is recorded to establish frequency-reference level calibration data.

[0030] S3: Divide the test frequency band into several frequency point combinations; retrieve the frequency-reference level calibration data established in step S2, and obtain the reference output level corresponding to each frequency point; control the vector signal generator to generate multiple carrier signals, and apply a preset phase offset to each carrier signal; linearly superimpose the multiple carrier signals after applying the phase offset to generate a multi-frequency carrier phase-shifted combination signal.

[0031] S4: Modulate the multi-frequency carrier phase-shifting combination signal to generate a modulated combination signal; input the modulated combination signal into a power amplifier for amplification to output a high-power multi-frequency carrier composite signal; convert the high-power multi-frequency carrier composite signal into an electromagnetic field through a transmitting antenna and apply it to the vehicle under test.

[0032] S5: During the application of the electromagnetic field, the vehicle data acquisition system is used to monitor and record the working status, bus messages and fault information of each electronic control unit of the vehicle under test in real time.

[0033] S6: Switch to the next frequency combination and repeat steps S3 to S5 until all frequency combinations are tested; summarize all test data and evaluate the vehicle's electromagnetic radiation anti-interference performance according to the preset failure judgment criteria.

[0034] As can be seen, the method achieves synchronous parallel testing of multiple frequency points through multi-frequency carrier phase shifting technology, thereby improving experimental efficiency. By controlling the superposition state of multiple carriers through preset phase offset, it avoids power amplifier saturation distortion and field strength exceeding the limit caused by the in-phase superposition of multiple frequency signals, thus ensuring the amplitude stability of the multi-frequency composite signal.

[0035] In one embodiment of the present invention, in order to further illustrate the content of the method steps of the present invention, in conjunction with... Figure 2 As shown, the control vector signal generator in step S2 adopts a single-frequency point mode, specifically including: S211: Disable the multi-frequency carrier modulation function of the vector signal generator and switch the signal output channel to single-channel continuous wave output mode; S212: Load the starting frequency of the test band into the control computer, set the vector signal generator output to an unmodulated continuous wave signal, and lock the current frequency output state; S213: Verify the impedance matching status of the output port of the vector signal generator. After confirming that the forward power transmission path is open, input a single-frequency continuous wave signal to the power amplifier.

[0036] As can be seen, by disabling the modulation enable signal of the multi-frequency carrier phase-shift modulation module through software commands, the synthesis path of multiple signals is cut off, forcing the vector signal generator into a single-channel baseband signal direct output state. The control computer sends a frequency setting command to the vector signal generator via GPIB or LAN bus, locks it to the specified frequency point, and outputs a pure sinusoidal continuous wave without any modulation processing. In step S213, the forward power probe of the power monitoring device detects the reflected power at the output port. When the reflected power is lower than the preset threshold, the impedance matching is deemed qualified, the forward power transmission path is open, and the single-frequency continuous wave signal is transmitted to the input of the power amplifier via the RF cable, ensuring that the field strength value collected by the field strength probe only reflects the radiated energy at the target frequency point.

[0037] Furthermore, the step-by-step output of signals and iterative adjustment of the output level in this embodiment specifically includes the following steps: Step S221: The field strength probe of the field strength monitoring system collects the measured field strength value of the current frequency point in the anechoic chamber test area and transmits the measured field strength value back to the control computer; Step S222: The control computer compares the measured field strength value with the target test field strength, calculates the deviation, generates a level adjustment command based on the deviation, and sends it to the vector signal generator; Step S223: After receiving the level adjustment command, the vector signal generator corrects the output level. The power amplifier synchronously amplifies the corrected signal. The field strength probe collects the measured field strength value again, so that each carrier signal has an initial phase when it is generated, until the measured field strength value falls into the allowable error range of the target test field strength.

[0038] It should be noted that the field strength probe is positioned at a predetermined location within the anechoic chamber testing area. The probe contains an isotropic sensor that converts electromagnetic field energy into a voltage signal. After analog-to-digital conversion by the field strength monitoring system, the signal is transmitted back to the control computer via a communication interface. The control computer runs an iterative level adjustment program, reads the target test field strength value, calculates the difference between the measured field strength value and the target test field strength value, and generates adjustment step sizes based on the absolute value of the difference. When the difference is greater than 3dB, a large step size is used for coarse adjustment; when the difference is between 1dB and 3dB, a medium step size is used for fine adjustment; and when the difference is less than 1dB, a micro step size is used for fine adjustment, generating a level adjustment command that includes the adjustment direction and adjustment amplitude.

[0039] After receiving the command, the programmable attenuator of the vector signal generator adjusts the attenuation amount and changes the output level. The power amplifier amplifies the adjusted signal with a fixed gain, and the field strength probe provides real-time feedback of the corrected field strength value, forming a negative feedback closed loop until the field strength value converges to within the allowable error range.

[0040] Furthermore, the specific steps for establishing frequency-reference level calibration data in this embodiment include the following: S231: Control the computer to read the output level reading of the vector signal generator when the current frequency point reaches the target test field strength, and record it as the reference output level of the vector signal generator at that frequency point; S232: The power probe of the power monitoring device synchronously reads the forward output power of the power amplifier, records it as the power amplifier output power at that frequency, and associates and binds the reference output level of the vector signal generator with the power amplifier output power. S233: The control computer writes the current frequency value, the reference output level of the vector signal generator, and the output power of the power amplifier into the calibration data table, switches to the next test frequency in ascending order of frequency, repeats steps S211 to S232, and outputs frequency-reference level calibration data after traversing the entire frequency band.

[0041] As can be seen, a vehicle electromagnetic radiation anti-interference field strength calibration system was constructed. This system consists of a vector signal generator, a power amplifier, a transmitting antenna, a field strength monitoring system, and an anechoic chamber. The multi-frequency carrier modulation function of the vector signal generator was disabled, and a traditional single-frequency calibration mode was adopted. Within the 10kHz–18GHz test frequency band, test frequencies were selected according to the standard-specified frequency intervals, covering the entire band. An unmodulated continuous wave signal was output separately for each frequency point. The field strength value of the anechoic chamber test area was acquired in real time through a field strength probe, and the output level of the vector signal generator was iteratively fine-tuned until the test field strength reached the desired value. E 0, record the reference output level of the vector signal generator corresponding to this frequency point. P 0( f and power amplifier output power P A ( f This generates complete frequency-reference level calibration data, enabling accurate calibration across the entire frequency band.

[0042] In one embodiment of the present invention, in order to further illustrate the content of the method steps of the present invention, in conjunction with... Figure 3 As shown, based on step S3, the test frequency band is divided into several frequency point combinations; the frequency-reference level calibration data established in step S2 is retrieved to obtain the reference output level corresponding to each frequency point; the vector signal generator is controlled to generate multiple carrier signals, and a preset phase offset is applied to each carrier signal, specifically including: S311: The control computer calculates the frequency value of each frequency point in ascending order based on the set start frequency, end frequency and frequency step value, starting from the start frequency and using the frequency step as the increment, until the end frequency is reached or exceeded, generating a full-band frequency point sequence. Based on the preset number of frequency points n in each group, the above frequency point sequence is divided into m groups from front to back. Each group contains n non-overlapping frequency points, and the nth frequency point is recorded. i Group 1 j The frequency value of each frequency point is f i,j ,in i =1,2,…,m; j =1,2,…,n.

[0043] S312: Controls the computer to traverse the frequency values ​​of all frequency points within the current group. f i,j Using each frequency value as a search keyword, a lookup operation is performed in the generated frequency-reference level calibration data table to read the reference output level power value corresponding to the frequency. P 0( f i,j ); If a calibration record matching the current polarization mode exists in the calibration data table, the record is read first; otherwise, the calibration record under the default polarization mode is read. The power values ​​of the reference output level at each frequency point are temporarily stored in the power array in memory.

[0044] S313: Controls the computer to read the reference output level power values ​​for each frequency point. P 0( f i,j Convert from dBm units to linear power values ​​and read the characteristic impedance value of the RF output port of the vector signal generator. Z According to the amplitude calculation formula

[0045] Calculate the voltage amplitude of the carrier signal at each frequency point. ; The control computer controls the voltage amplitude. Adjust the output level parameters of each signal in the multi-channel signal generation module of the vector signal generator to match the amplitude of each carrier signal with the calculated value.

[0046] S314: Control the computer to read the total number of frequency points n in the current group, according to the formula.

[0047] Calculate the phase offset to be applied at the j-th frequency point within the group. The control computer will calculate the phase offset. Write the phase control register of the multi-frequency carrier phase-shifting modulation module of the vector signal generator so that each carrier signal has an initial phase when it is generated.

[0048] It should be noted that the control computer reads the set start frequency value Fstart, end frequency value Fstop, and frequency step value Fstep. The control computer assigns the start frequency value Fstart to the current frequency variable Fcurrent and writes Fcurrent to the first element of the frequency sequence array.

[0049] Control the computer to perform a loop operation: In each loop, increment the current frequency variable by a frequency step value Fstep, and append the incremented frequency value to the next element of the frequency point sequence array. Repeat this operation until the current frequency variable is greater than or equal to the termination frequency value Fstop, at which point the loop terminates.

[0050] This generates an ordered frequency point sequence containing all test frequencies, with a total number of frequencies of ((Fstop - Fstart) / Fstep) + 1. The control computer reads the preset number n of frequencies per group, and starting from the first element of the frequency point sequence, divides every n frequencies into a group, continuing this division until all frequencies are covered; if the last group has fewer than n frequencies, the remaining frequencies are treated as a separate group. The control computer assigns a unique group number to each group. i ( i =1,2,…,m), and assign a group number to each frequency point within the group. j ( j =1,2,…,n), record the first... i Group 1 j The frequency value of each frequency point is f i,j .

[0051] Furthermore, the calibration data table is sorted in ascending order of frequency values. Starting from the first record, the table is scanned sequentially, comparing the frequency value in each record with the search keyword until a record matching the keyword is found. After reading, the value of the reference level field is recorded. P 0( f i,j ).

[0052] The control computer determines whether an independent calibration column matching the current test polarization exists in the calibration data table. If it does, it reads the reference level power value corresponding to that column; otherwise, it reads the calibration value under the default polarization. The control computer stores the read reference level power value into the power array element corresponding to the current frequency point in memory. P 0( f i,jThe control computer sequentially performs the above search and read operations on all frequency points within the current group until the reference level power values ​​of all frequency points within the group are stored in the power array.

[0053] Distinguishing the polarization mode when reading the calibration value ensures that the output power of the multi-frequency synthesized signal at each frequency point is completely consistent with the power under that polarization mode during calibration, avoiding field strength errors introduced by different polarization modes.

[0054] The calibrated power value P 0( f i,j The voltage amplitude is converted into a voltage value, which ensures that the actual output power of each frequency point during multi-frequency synthesis is consistent with the reference power during calibration, thereby ensuring that the field strength generated at each frequency point after passing through the power amplifier and antenna accurately reaches the target value.

[0055] Furthermore, the computer is controlled according to the formula = Calculate the first in the group j Phase offset to be applied at each frequency point The formula can be expanded to: the first frequency point ( j The phase offset of (=1) is φ 1=0; the second frequency point ( j =2) phase offset is φ 2 = 2π / n²; the third frequency point ( j The phase offset of =3) is φ 3 = 4π / n²; and so on, the nth frequency point ( j The phase offset of =n) is φ n =2π(n-1) / n². The control computer will calculate the phase offset. Write the phase control register of the multi-frequency carrier phase-shifting modulation module of the vector signal generator, and control the computer to perform the above phase offset calculation and phase control register writing operations on all frequency points in the current group in sequence until the initial phase of all frequency points in the group is set.

[0056] Furthermore, in this embodiment S3, the linear superposition of the multi-carrier signals after phase shifting to generate a multi-frequency carrier phase-shifted combination signal specifically includes: S321: Send a start command to the vector signal generator. Based on the amplitude parameters of each frequency point set in step S313 and the initial phase parameters of each frequency point set in step S314, the generator operates in parallel under the same system clock drive, with each channel independently outputting a channel with a specified frequency. f i,j , Specify amplitude and specified initial phase φ jThe carrier signal.

[0057] S322: Based on multiple carrier signals, within each clock cycle, the instantaneous values ​​of each signal at the same moment are algebraically summed to obtain the instantaneous amplitude of the superimposed multiple signals at that moment. .

[0058] S323: The vector signal generator outputs the obtained instantaneous amplitude after conditioning and conversion.

[0059] It should be noted that each signal generation channel operates synchronously under the same system clock, based on the amplitude parameters set in step S313 and the initial phase parameters set in step S314. Each channel independently generates a signal with a specified frequency. , Specify amplitude and specified initial phase The carrier signal, whose instantaneous value corresponds to the j-th term in the time domain. All channels operate synchronously, with each channel independently outputting a sequence of instantaneous carrier signal values. In this way, each signal is generated independently, with varying frequencies. Amplitude The three parameters, including phase, are independently adjustable and do not affect each other.

[0060] Furthermore, the linear superposition of multiple sinusoidal signals in the time domain follows the superposition theorem, meaning the instantaneous value of the synthesized signal at any given moment is equal to the algebraic sum of the instantaneous values ​​of each component signal at the same moment. The adder circuit inside the signal synthesis module performs this arithmetic summation operation. Due to the frequency of each signal... Since the initial phases of the signals are different, the instantaneous values ​​of each signal at the same moment may all be positive, all be negative, or alternate between positive and negative. The algebraic sum depends on the specific phase state of each signal at the current moment. The output bit width of the adder circuit is extended to accommodate the sum of the peak values ​​of each signal, ensuring that the synthesized signal is not clipped or distorted. After processing by the signal conditioning circuit inside the vector signal generator, which includes amplification, filtering, and attenuation, a multi-frequency carrier phase-shifted composite signal in analog form is output from the RF output port of the vector signal generator. This ensures that the output level at each frequency point is consistent with the reference level recorded during calibration, thereby guaranteeing that the actual radiation field strength at each frequency point reaches the target value.

[0061] In one embodiment of the present invention, in order to further illustrate the content of the method steps of the present invention, in conjunction with... Figure 4 As shown, based on the modulation processing of the multi-frequency carrier phase-shifting combination signal in step S4, a modulated combination signal is generated; the modulated combination signal is input to a power amplifier for amplification, and a high-power multi-frequency carrier composite signal is output; the high-power multi-frequency carrier composite signal is converted into an electromagnetic field through a transmitting antenna and applied to the vehicle under test, specifically including: A modulation parameter command is sent to the vector signal generator to apply a modulation scheme to the multi-frequency carrier phase-shifting combination signal generated in step S3, generate a modulated combination signal, and send it to the power amplifier. The forward power probe of the power monitoring device couples the forward power at the input of the power amplifier, and the reverse power probe couples the reflected power. The power meter sends the power reading back to the control computer. The control computer compares the forward power with the rated input power of the power amplifier to confirm that the forward power is within the linear input range. The power amplifier amplifies the modulated combined signal with a preset gain and outputs a high-power multi-frequency carrier composite signal. The power monitoring device monitors the forward and reverse output power of the power amplifier in real time and controls the computer to calculate the reflection coefficient. When the reflection coefficient exceeds the preset threshold, the output level of the vector signal generator is reduced until the reflection coefficient falls back below the threshold. A high-power, multi-frequency carrier composite signal is transmitted via a coaxial cable through a wall panel connector into the anechoic chamber. It is then radiated to the area where the vehicle under test is located via a transmitting antenna mounted above the chamber floor. The transmitting antenna maintains a distance of [missing information - likely a specific distance between it and the vehicle under test]. d The field strength is ≥2m, forming a multi-frequency superimposed composite electromagnetic interference field around the vehicle under test; the vehicle signal monitoring device and audio-visual monitoring device are arranged inside the vehicle under test, and the collected data is transmitted to the data acquisition terminal through optical fiber.

[0062] As can be seen, after receiving the modulation parameter instructions from the control computer, the vector signal generator mixes and modulates the baseband multi-frequency carrier phase-shifted combination signal generated in step S3 with a high-frequency carrier. This process shifts the spectrum of the multi-frequency signal from the baseband to the set radio frequency band, and simultaneously loads a specific modulation method according to the instructions, ultimately generating a modulated combination signal.

[0063] The modulated combined signal is then fed into a power amplifier. The power amplifier's function is to amplify the input modulated signal without distortion to the high power level required for the test, within a preset linear operating range. To ensure the amplifier always operates in the linear region, a power monitoring device couples the forward and reflected power on the transmission line in real time using its forward and reverse power probes. The power meter sends the readings back to the control computer, which compares the forward power with the amplifier's rated input to confirm it is within the linear range, thus avoiding signal clipping distortion caused by overdrive.

[0064] While the signal is amplified, the control computer continuously calculates the reflection coefficient. When the reflection coefficient exceeds a preset threshold, it indicates a mismatch between the load and the amplifier's output impedance. At this point, the control computer reduces the output level of the vector signal generator to decrease the transmitted power until the reflection coefficient falls back below the safe threshold. This effectively prevents permanent damage to the power amplifier caused by excessive reflected power.

[0065] The high-power multi-frequency carrier composite signal, after linear amplification, enters the anechoic chamber. The signal is then fed to the transmitting antenna. The transmitting antenna converts high-frequency electrical energy into electromagnetic waves and radiates them into space, creating a multi-frequency superimposed composite electromagnetic interference field around the vehicle under test. Simultaneously, vehicle signal monitoring and audio / video monitoring devices located inside the vehicle transmit the collected vehicle response data in real time to a data acquisition terminal outside the anechoic chamber, ensuring the authenticity and accuracy of the monitoring data.

[0066] In one embodiment of the present invention, to further illustrate the content of the method steps of the present invention, as follows: Figure 5 As shown, based on step S5, during the application of the electromagnetic field, the vehicle data acquisition system is used to monitor and record in real time the operating status, bus messages, and fault information of each electronic control unit of the vehicle under test, specifically including: S51: Install a vehicle signal monitoring device, an audio-visual monitoring device, and a data acquisition terminal inside the vehicle under test; connect the analog sampling port of the vehicle signal monitoring device to the signal output terminals of the power battery management system, motor controller, vehicle central control unit, autonomous driving controller, air conditioning controller, instrument cluster, vehicle speed sensor, and lighting controller, respectively; align the camera module of the audio-visual monitoring device with the central control display screen and the instrument cluster display screen; connect the data acquisition terminal to the OBD diagnostic port of the vehicle under test.

[0067] S52: Configure the sampling frequency, CAN message identifier filter table and fault judgment threshold in the data acquisition terminal; control the data acquisition terminal to synchronously collect voltage value, current value and status level value according to the sampling frequency, listen to the CAN bus message stream and capture target identifier message, and also receive video stream data output by the audio and video monitoring device.

[0068] S53: Compare the collected voltage, current and status level values ​​with the fault judgment threshold item by item; compare the identifier and data payload of the acquired CAN message stream with the standard message database item by item; compare the similarity of the displayed frames of the video stream data with the normal display reference frames. If any comparison result deviates from the normal range, the voltage value, current value, status level value, CAN message content and video frame sequence number corresponding to that moment are written to the local storage unit and marked with a timestamp.

[0069] It can be seen that if any of the voltage, current, status level, CAN message, and video similarity deviates from the normal range, all data will be recorded in a coordinated manner to ensure the integrity of the failure mode and meet the test requirements.

[0070] In one embodiment of the present invention, to further illustrate the content of the method steps of the present invention, the evaluation of the electromagnetic radiation anti-interference performance of the vehicle based on the preset failure judgment criteria in step S6 specifically includes: S61: Establish a failure judgment criterion library, including voltage over-limit criteria, current over-limit criteria, abnormal status level criteria, CAN message timeout criteria, CRC check error criteria, abnormal display criteria, and function degradation criteria; group the collected working status data, bus messages, and fault information by frequency point, and extract abnormal data items from each group.

[0071] S62: Compare each group of abnormal data entries with the failure judgment criterion library item by item to identify abnormal events such as voltage values ​​exceeding the normal operating range, current values ​​exceeding the overcurrent threshold, status levels falling into the transition range, missing CAN message identifiers or abnormal data loads, grayscale root mean square deviation of the display screen exceeding the limit, and functional module response delay or output interruption; count the number of abnormal events and the duration of abnormal events corresponding to each group of frequency points.

[0072] S63: Set failure judgment thresholds, including the threshold for the number of abnormal events in a single frequency point combination and the threshold for the duration of abnormal events; compare the number of abnormal events and the duration of abnormal events in each frequency point combination with the corresponding thresholds. If the number of abnormal events exceeds the threshold or the duration of abnormal events exceeds the threshold, the electromagnetic radiation anti-interference performance of the vehicle corresponding to that frequency point combination is judged to be unqualified; summarize the judgment results of all frequency point combinations and output the vehicle electromagnetic radiation anti-interference performance evaluation information.

[0073] It should be noted that the voltage over-limit criteria record the upper and lower boundaries of the normal operating range of the total positive and negative voltage of the power battery management system, and the upper and lower boundaries of the normal operating range of the three-phase current of the motor controller. The current over-limit criterion records the overcurrent threshold of the three-phase current of the motor controller and the overcurrent threshold of the LED drive current of the lighting controller. The abnormal state level criteria record the high-level tolerance range and low-level tolerance range of the backlight PWM feedback terminal of the vehicle central control unit, and the effective level judgment boundary of the enable state terminal of the autonomous driving controller system. The CAN message timeout criteria record the maximum allowed interval time for each target identifier message, and the CRC check error criteria record the number of errors tolerated in the CRC checksum of the data field. The abnormal display criteria record the grayscale root mean square deviation threshold of the central control display screen and the instrument cluster display screen. The function degradation criteria record the upper limit of time from receiving a command to the effective feedback at the air conditioning compressor clutch feedback end, and the upper limit of time from vehicle movement to the output pulse at the vehicle speed sensor magnetoelectric pulse output end.

[0074] Furthermore, the control computer compares the analyzed voltage values ​​in each group with the upper and lower boundaries of the voltage over-limit criteria, and marks entries that are higher than the upper boundary or lower than the lower boundary as voltage over-limit anomalies.

[0075] The current values ​​are compared one by one with the overcurrent threshold of the current over-limit criterion, and the items that exceed the overcurrent threshold are marked as current over-limit anomalies.

[0076] The state level value is compared with the high-level tolerance range and low-level tolerance range of the state level anomaly criterion. Entries that do not fall within either the high-level tolerance range or the low-level tolerance range are marked as state level anomalies.

[0077] The CAN message identifier is compared item by item with the whitelist identifier of the CAN message timeout criterion. Entries whose whitelist identifiers do not appear within the maximum allowed interval are marked as message timeout exceptions. The CAN message data field CRC checksum is compared with the standard CRC polynomial calculation result. Entries that do not match are marked as CRC error exceptions.

[0078] The sum of the absolute values ​​of the pixel-level differences between the grayscale matrix of the video frame and the grayscale matrix of the normal display reference frame is calculated and converted into the root mean square deviation of grayscale. Entries that exceed the threshold of the display abnormality criterion are marked as display abnormalities.

[0079] Optionally, the grayscale matrix size is the product of the horizontal and vertical pixel counts, and the root mean square deviation is calculated using the following formula: ,in The grayscale value of the frame to be tested. is the grayscale value of the baseline frame, and N is the total number of pixels.

[0080] The feedback time of the air conditioning compressor clutch and the pulse output time of the vehicle speed sensor are compared with the time limit of the function degradation criteria. Items that exceed the time limit are marked as function degradation anomalies.

[0081] The system tracks the cumulative occurrence of various abnormal events within each frequency combination and records the duration of each abnormal event. This ensures consistent and repeatable evaluation criteria, supports multi-dimensional failure mode identification (FMT) testing, and improves the accuracy and relevance of testing.

[0082] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0083] like Figure 6As shown, this application also provides a control computer, including a display module 103, a memory 102, a processor 101, a communication module 104, and a computer program stored in the memory and executable on the processor 101. When the processor 101 executes the program, it implements the steps of the vehicle electromagnetic radiation anti-interference performance test method.

[0084] In embodiments of the present invention, the control computer includes, but is not limited to, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The control computer may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments described and / or claimed herein.

[0085] In this embodiment, processor 101 may be implemented using at least one of an application-specific integrated circuit, a programmable logic device, a field-programmable gate array, a processor, a controller, a microcontroller, a microprocessor, or an electronic unit designed to perform the functions described herein. In some cases, such an implementation may be implemented within a controller. For software implementation, implementations such as processes or functions may be implemented with separate software modules that allow the performance of at least one function or operation. Software code may be implemented by a software application (or program) written in any suitable programming language, and the software code may be stored in memory and executed by the controller.

[0086] The display module 103 is used to display information input by the user or information provided to the user. The display module 103 may include a display panel, which may be configured in the form of a liquid crystal display, an organic light-emitting diode, or the like.

[0087] The memory 102 can be used to store software programs and various data. The memory 102 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0088] The communication module 104 transmits radio signals to and / or receives radio signals from at least one of a base station, an external terminal, and a server. Such radio signals may include voice call signals, video call signals, or various types of data sent and / or received according to text and / or multimedia messages.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test method for the electromagnetic radiation immunity performance of a vehicle, characterized in that the method... include: S1: Construct an experimental system consisting of a vector signal generator, a power amplifier, a transmitting antenna, a field strength monitoring system, and a vehicle data acquisition system; Set the target test field strength, dwell time, polarization mode, and frequency range; S2: The vector signal generator is controlled to use a single-frequency-point mode, outputting signals point by point within the test frequency band. The field strength monitoring system provides real-time feedback and iteratively adjusts the output level of the vector signal generator until the target test field strength is reached. The reference output level of the vector signal generator corresponding to each frequency point is recorded to establish frequency-reference level calibration data. S3: Divide the test frequency band into several groups of frequency points; Retrieve the frequency-reference level calibration data established in step S2, obtain the reference output level corresponding to each group of frequency points; control the vector signal generator to generate multiple carrier signals, and apply a preset phase offset to each carrier signal; linearly superimpose the multiple carrier signals after applying the phase offset to generate a multi-frequency carrier phase-shifted combination signal; S4: Modulate the multi-frequency carrier phase-shifting combination signal to generate a modulated combination signal; input the modulated combination signal into a power amplifier for amplification to output a high-power multi-frequency carrier composite signal; convert the high-power multi-frequency carrier composite signal into an electromagnetic field through a transmitting antenna and apply it to the vehicle under test. S5: During the application of the electromagnetic field, the vehicle data acquisition system is used to monitor and record the working status, bus messages and fault information of each electronic control unit of the vehicle under test in real time. S6: Switch to the next frequency combination and repeat steps S3 to S5 until all frequency combinations are tested; summarize all test data and evaluate the vehicle's electromagnetic radiation anti-interference performance according to the preset failure judgment criteria.

2. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, The control vector signal generator in S2 adopts a single-frequency point mode, specifically including: Turn off the multi-frequency carrier modulation function of the vector signal generator and switch the signal output channel to single-channel continuous wave output mode; Load the starting frequency of the test band into the control computer, set the vector signal generator output to an unmodulated continuous wave signal, and lock the current frequency output state. After verifying the impedance matching status of the vector signal generator output port and confirming that the forward power transmission path is conducting, input a single-frequency continuous wave signal to the power amplifier.

3. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, In S2, signals are output point by point within the test frequency band. The field strength monitoring system provides real-time feedback and iteratively adjusts the output level of the vector signal generator until the target test field strength is achieved. Specifically, this includes: The field strength monitoring system's field strength probe collects the measured field strength value at the current frequency point in the anechoic chamber test area and transmits the measured field strength value back to the control computer. The control computer compares the measured field strength value with the target test field strength, calculates the deviation, generates a level adjustment command based on the deviation, and sends it to the vector signal generator. After receiving the level adjustment command, the vector signal generator corrects the output level. The power amplifier synchronously amplifies the corrected signal, and the field strength probe collects the measured field strength value again, so that each carrier signal has an initial phase when it is generated, until the measured field strength value falls into the allowable error range of the target test field strength.

4. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 2, characterized in that, In S2, establishing the frequency-reference level calibration data specifically includes: Read the output level reading of the vector signal generator when the current frequency point reaches the target test field strength, and record it as the reference output level of the vector signal generator at that frequency point; The power probe of the power monitoring device synchronously reads the forward output power of the power amplifier and records it as the power amplifier output power at that frequency point. The reference output level of the vector signal generator is then associated and bound with the power amplifier output power. Write the current frequency value, the vector signal generator reference output level, and the power amplifier output power into the calibration data table. Switch to the next test frequency in ascending order and repeat the test. After traversing the entire frequency band, output the frequency-reference level calibration data.

5. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, In step S3, the test frequency band is divided into several frequency point combinations; the frequency-reference level calibration data established in step S2 is retrieved to obtain the reference output level corresponding to each frequency point; the vector signal generator is controlled to generate multiple carrier signals, and a preset phase offset is applied to each carrier signal, specifically including: Based on the set start frequency, end frequency, and frequency step value, the frequency value of each frequency point is calculated sequentially starting from the start frequency with the frequency step as the increment, until the end frequency is reached or exceeded, generating a full-band frequency point sequence arranged in ascending order. Based on the preset number of frequency points n in each group, the above frequency point sequence is divided into m groups from front to back. Each group contains n non-overlapping frequency points, and the nth frequency point is recorded. i Group 1 j The frequency value of each frequency point is f i,j ,in i =1,2,…,m; j =1,2,…,n; Control the computer to traverse the frequency values ​​of all frequency points within the current group. f i,j Using each frequency value as a search keyword, a lookup operation is performed in the generated frequency-reference level calibration data table to read the reference output level power value corresponding to the frequency. P 0( f i,j ); If a calibration record matching the current polarization mode exists in the calibration data table, the record is read first; otherwise, the calibration record under the default polarization mode is read. The power values ​​of the reference output level at each frequency point are temporarily stored in the power array in memory. The control computer will read the reference output level power values ​​at each frequency point. P 0( f i,j Convert from dBm units to linear power values ​​and read the characteristic impedance value of the RF output port of the vector signal generator. Z According to the amplitude calculation formula Calculate the voltage amplitude of the carrier signal at each frequency point. ; The control computer controls the voltage amplitude. Adjust the output level parameters of each signal in the multi-channel signal generation module of the vector signal generator to match the amplitude of each carrier signal with the calculated value; The computer reads the total number of frequency points n in the current group, according to the formula. Calculate the first in the group j Phase offset to be applied at each frequency point The control computer will calculate the phase offset. Write the phase control register of the multi-frequency carrier phase-shifting modulation module of the vector signal generator so that each carrier signal has an initial phase when it is generated.

6. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 5, characterized in that, In S3, the multi-carrier signals after phase shifting are linearly superimposed to generate a multi-frequency carrier phase-shifted combination signal, specifically including: A start command is sent to the vector signal generator. Based on the set amplitude parameters and initial phase parameters for each frequency point, the generator operates in parallel under the same system clock, with each channel independently outputting a signal at a specified frequency. f i,j , Specify amplitude and specified initial phase The carrier signal; Based on multiple carrier signals, within each clock cycle, the instantaneous values ​​of each signal at the same moment are algebraically summed to obtain the instantaneous amplitude of the superimposed multiple signals at that moment. The vector signal generator outputs the obtained instantaneous amplitude after conditioning and conversion.

7. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, S4 specifically includes: A modulation parameter command is sent to the vector signal generator to apply a modulation scheme to the multi-frequency carrier phase-shifting combination signal generated in step S3, generate a modulated combination signal, and send it to the power amplifier. The forward power probe of the power monitoring device couples the forward power at the input of the power amplifier, and the reverse power probe couples the reflected power. The power meter transmits the power reading back to the control computer. The control computer compares the forward power with the rated input power of the power amplifier to confirm that the forward power is within the linear input range.

8. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, S5 specifically includes: A vehicle signal monitoring device, an audio-visual monitoring device, and a data acquisition terminal are installed inside the vehicle under test. The analog sampling port of the vehicle signal monitoring device is connected to the signal output terminals of the power battery management system, motor controller, vehicle central control unit, autonomous driving controller, air conditioning controller, instrument cluster, vehicle speed sensor, and lighting controller, respectively. The camera module of the audio-visual monitoring device is aligned with the central control display screen and the instrument cluster display screen. The data acquisition terminal is connected to the OBD diagnostic port of the vehicle under test. Configure the sampling frequency, CAN message identifier filter table, and fault judgment threshold in the data acquisition terminal; control the data acquisition terminal to synchronously acquire voltage values, current values, and status level values ​​according to the sampling frequency, listen to the CAN bus message stream and capture target identifier messages, and also receive video stream data output by the audio and video monitoring device; The collected voltage, current, and status level values ​​are compared with the fault judgment threshold item by item; the identifiers and data payloads of the acquired CAN message stream are compared with the standard message database item by item; and the similarity of the displayed frames of the video stream data with the normal display reference frames is compared. If any comparison result deviates from the normal range, the voltage value, current value, status level value, CAN message content and video frame sequence number corresponding to that moment are written to the local storage unit and marked with a timestamp.

9. The test method for vehicle electromagnetic radiation anti-interference performance according to claim 1, characterized in that, In S6, the evaluation of the vehicle's electromagnetic radiation immunity performance according to the preset failure judgment criteria specifically includes: Establish a failure judgment criterion library, including voltage over-limit criteria, current over-limit criteria, abnormal status level criteria, CAN message timeout criteria, CRC check error criteria, abnormal display criteria, and function degradation criteria; group the collected working status data, bus messages, and fault information by frequency point, and extract abnormal data items from each group. Each abnormal data entry is compared with the failure judgment criterion library to identify abnormal events such as voltage values ​​exceeding the normal operating range, current values ​​exceeding the overcurrent threshold, status levels falling into the transition range, missing CAN message identifiers or abnormal data payloads, grayscale root mean square deviation of the display screen exceeding the limit, and functional module response delay or output interruption; the number of abnormal events and the duration of abnormality corresponding to each frequency point combination are counted. Set a failure judgment threshold, and compare the number of abnormal events and the duration of abnormal events for each frequency point combination with the corresponding threshold. When the number of abnormal events exceeds the quantity threshold or the duration of abnormal events exceeds the time threshold, the electromagnetic radiation anti-interference performance of the vehicle corresponding to that frequency point combination is judged to be unqualified. Summarize the judgment results of all frequency point combinations and output the vehicle electromagnetic radiation anti-interference performance evaluation information.

10. A control computer, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the vehicle electromagnetic radiation anti-interference performance test method as described in any one of claims 1 to 9.

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