Simulation test method and system for radiation sensitivity of electric field

Abstract

The invention provides a simulation test method and system for radiation sensitivity of an electric field. The method comprises the following steps: acquiring target field intensity of an interference source and simulation parameters of equipment to be tested; constructing a log-periodic antenna model according to the target field intensity, wherein the log-periodic antenna model is a simulation model of a non-frequency-varying broadband antenna; constructing an equipment simulation model of the to-be-tested equipment according to the simulation parameters; importing the log-periodic antenna model and the equipment simulation model into a preset simulation test environment; and in the simulation test environment, performing an electric field radiation sensitivity simulation test on the equipment simulation model based on a preset interference mode. According to the application, the antenna model is established as an interference source to apply interference to the tested equipment, so that the simulation test of the electric field radiation sensitivity is carried out, and the simulation test precision and the simulation test comprehensiveness of the electric field radiation sensitivity are improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric field radiation sensitivity and simulation testing, and in particular to a simulation testing method and system for electric field radiation sensitivity. Background Art

[0002] Electric field radiation sensitivity is an indicator that measures the device's resistance to electric field radiation within a specific frequency range. It refers to the minimum threshold at which the device can still work normally when subjected to electric field radiation of a certain intensity. The higher this threshold value, the stronger the device's anti-interference ability, and vice versa. The electric field radiation sensitivity simulation test is a method of testing and analyzing the sensitivity of the device in an electric field radiation environment through computer simulation. During the test, the simulation software will build an electromagnetic model of the device based on the device's geometric dimensions, material properties, circuit layout and other information. Then, by applying electric field radiation of a specific frequency and intensity to the model, the electric field distribution and current changes inside the device are observed, thereby evaluating the device's electric field radiation sensitivity.

[0003] In GJB151B-2013 (Requirements and Measurements for Electromagnetic Emissions and Sensitivity of Military Equipment and Subsystems), the idea of ​​simulating electric field radiation sensitivity is to establish an interference source, then irradiate the equipment under test with the interference source, and finally calculate the radiation sensitivity related data. However, the current existing simulation technology mainly uses plane waves as interference sources. However, compared with actual tests, this simulation method has a large difference in interference sources, which leads to reduced simulation accuracy and large errors. Summary of the invention

[0004] In response to the above technical problems, the present application provides a simulation test method and system for electric field radiation sensitivity, which establishes an antenna model as an interference source to interfere with the device under test, thereby performing a simulation test of the electric field radiation sensitivity, thereby improving the simulation test accuracy and comprehensiveness of the electric field radiation sensitivity.

[0005] In a first aspect, an embodiment of the present application provides a simulation test method for electric field radiation sensitivity, comprising:

[0006] Obtain the target field strength of the interference source and the simulation parameters of the device under test;

[0007] Constructing a logarithmic periodic antenna model according to the target field strength, wherein the logarithmic periodic antenna model is a simulation model of a non-frequency-variant broadband antenna;

[0008] Constructing a device simulation model of the device under test according to the simulation parameters;

[0009] Importing the log-periodic antenna model and the device simulation model into a preset simulation test environment;

[0010] In the simulation test environment, an electric field radiation sensitivity simulation test is performed on the device simulation model based on a preset interference pattern.

[0011] The embodiment of the present application provides a simulation test method for electric field radiation sensitivity, which realizes the simulation test of electric field radiation sensitivity by constructing a logarithmic periodic antenna model for releasing interference signals and a device simulation model of the device to be tested, and importing the two models into a preset simulation test environment. Among them, in the selection of the simulation model of the interference source, the embodiment of the present application selects a simulation model of a non-frequency-variable broadband antenna. The non-frequency-variable broadband antenna has a wide-band characteristic, which means that it can provide a stable interference signal within a wider frequency range and can simulate interference conditions at multiple frequencies. Compared with the establishment of a plane wave as an interference source in the prior art, the embodiment of the present application improves the simulation test accuracy of electric field radiation sensitivity. Furthermore, thanks to the characteristics of the above-mentioned non-frequency-variable broadband antenna, the embodiment of the present application can select a variety of interference modes when conducting electric field radiation sensitivity simulation tests, thereby improving the comprehensiveness of the simulation test.

[0012] In a possible implementation manner, constructing a logarithmic periodic antenna model according to the target field strength includes:

[0013] Constructing an initial logarithmic periodic antenna model according to preset initial parameters and antenna structure, wherein the preset initial parameters include antenna operating frequency range, length of each dipole, dipole spacing, and matching impedance;

[0014] Determining performance requirements of the log-periodic antenna model according to the target field strength, the performance requirements including a target standing wave ratio and a target antenna gain;

[0015] The initial log-periodic antenna model is iteratively optimized several times according to the target standing wave ratio and the target antenna gain, wherein in each iteration, the length of each vibrator and the vibrator spacing are adjusted according to the performance requirements until the current standing wave ratio and the current antenna gain of the initial log-periodic antenna model meet the performance requirements, thereby obtaining the log-periodic antenna model.

[0016] The embodiment of the present application provides a method for constructing a logarithmic periodic antenna model. First, based on preset parameters and antenna structure, an initial logarithmic periodic antenna model can be quickly obtained. Then, according to the performance requirements of the test items for the antenna, each test in the initial logarithmic periodic antenna model is optimized and adjusted through multiple iterations. Among them, in the process of optimizing and adjusting the antenna model, the vibrator length and vibrator spacing of the model are mainly adjusted. This is because in the logarithmic periodic antenna model, the signal is fed to each vibrator through a collection line, and each vibrator further amplifies the signal and radiates it to space. The amplified signals output by each vibrator interact with each other and eventually form an interference signal. Therefore, the vibrator length and vibrator spacing in the logarithmic periodic antenna model have the greatest impact on the performance of the antenna model, and mainly affect the standing wave ratio and antenna gain of the antenna. The embodiment of the present application can effectively change the standing wave ratio and antenna gain of the antenna model by optimizing and adjusting the vibrator length and vibrator spacing multiple times, so that the logarithmic periodic antenna model finally obtained meets the performance requirements of the simulation test, and further improves the accuracy of the simulation test.

[0017] In a possible implementation manner, the importing the log-periodic antenna model and the device simulation model into a preset simulation test environment includes:

[0018] Determine corresponding positions of the device simulation model and the log-periodic antenna model in the simulation test environment according to the simulation test requirements of the device under test, and import the log-periodic antenna model and the device simulation model into the corresponding positions respectively;

[0019] The simulation test environment is simulated and calibrated according to the target field strength and the interference pattern.

[0020] Further, the simulation calibration of the simulation test environment according to the target field strength and the interference pattern includes:

[0021] Determining a feeding port voltage of the log-periodic antenna model according to the target field strength;

[0022] An interference signal type of the log-periodic antenna model is determined according to the interference pattern.

[0023] In an embodiment of the present application, when importing a log-periodic antenna model and a device simulation model, the simulation test environment is simulated and calibrated according to the target field strength and interference pattern, and the feed port voltage and interference signal type of the log-periodic antenna model are determined, so that the log-periodic antenna model can output an interference signal of corresponding frequency and field strength during the simulation test, thereby further improving the accuracy of the simulation test.

[0024] In a possible implementation, when the interference mode is a frequency sweep mode, performing an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment includes:

[0025] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0026] Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency;

[0027] The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0028] In an embodiment of the present application, when the interference mode is a sweep mode, the antenna model automatically and continuously changes the frequency of the output signal within a specified frequency range, and obtains the frequency domain voltage signal of the device simulation model at different frequencies, thereby evaluating the electric field radiation sensitivity of the device under test based on the frequency domain voltage signal. In the sweep mode, the frequency of the output signal can be changed automatically and continuously without manual adjustment, which greatly improves the test efficiency. At the same time, the frequency range and step of the test can be precisely controlled to ensure the accuracy of the test results. Finally, the sweep mode can cover a wide frequency range, thereby comprehensively evaluating the electric field radiation sensitivity of the device under test at different frequencies.

[0029] In a possible implementation, when the interference pattern is a single-frequency interference pattern, performing an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern in the simulation test environment includes:

[0030] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0031] According to the preset carrier amplitude and carrier frequency, the interference signal is amplitude modulated to output a single-frequency interference signal of the preset carrier frequency;

[0032] The time domain voltage signal of the preset position of the device simulation model is continuously acquired, and the time domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0033] In an embodiment of the present application, when the interference mode is a single-frequency interference mode, the interference signal output by the antenna is amplitude modulated, the frequency of the interference signal is changed, and a single-frequency interference signal of a preset frequency is generated. Accordingly, under the influence of the single-frequency interference signal, the time domain voltage signal of the device simulation model is continuously acquired, so as to evaluate the electric field radiation sensitivity of the device under test at a specific frequency, as well as the working performance and anti-interference ability of the device at this frequency based on the time domain voltage signal. Compared with the sweep frequency mode, the test steps of the single-frequency interference mode are simpler, the test time is shorter, and it can be tested for a specific frequency, which helps to quickly and accurately evaluate the electric field radiation sensitivity of the device under test at this frequency.

[0034] In a possible implementation, the log-periodic antenna model includes a collection line, a feeding port, a plurality of dipole element pairs and a lumped port;

[0035] The lengths of the oscillators in the same dipole oscillator pair are the same, and the lengths of the oscillators in different dipole oscillator pairs are different. The dipole oscillator pairs are arranged in order from long to short along the collection line according to the length of the oscillators, and are bilaterally symmetrical based on the collection line.

[0036] The two ends of the collective line are the feeding port and the lumped port respectively, wherein the dipole pair closest to the lumped port has the longest dipole length, and the dipole pair closest to the feeding port has the shortest dipole length.

[0037] The embodiment of the present application provides a model structure of a logarithmic periodic antenna model. The logarithmic periodic antenna itself can be divided into two parts. One part is called the collective line, which is responsible for feeding each vibrator, which is equivalent to a transmission line; the other part is the vibrator, which is used to guide and amplify electromagnetic waves, so that the electromagnetic signal received by the antenna is stronger. By establishing a feeding point on the antenna, the signal will be fed to each vibrator through the collective line, and each vibrator will further amplify the signal and radiate it into space. The logarithmic periodic antenna provided in the embodiment of the present application can ensure that the antenna has a small standing wave ratio and high gain by adjusting the vibrator length and the vibrator spacing; a large number of vibrators can ensure good directivity of the antenna; the feeding method and feeding point adopted can also ensure good directivity and standing wave ratio of the antenna.

[0038] In a second aspect, accordingly, an embodiment of the present application provides a simulation test system for electric field radiation sensitivity, including an acquisition module, an antenna model construction module, a device model construction module, an import module, and a test module;

[0039] Wherein, the acquisition module is used to obtain the target field strength of the interference source and the simulation parameters of the device under test;

[0040] The antenna model construction module is used to construct a logarithmic periodic antenna model according to the target field strength, and the logarithmic periodic antenna model is a simulation model of a non-frequency-variant broadband antenna;

[0041] The device model building module is used to build a device simulation model of the device under test according to the simulation parameters;

[0042] The import module is used to import the log-periodic antenna model and the device simulation model into a preset simulation test environment;

[0043] The test module is used to perform an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern in the simulation test environment.

[0044] In a possible implementation, when the interference mode is a frequency sweep mode, the test module performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment, including:

[0045] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0046] Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency;

[0047] The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0048] In a possible implementation, when the interference pattern is a single-frequency interference pattern, the test module performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern in the simulation test environment, including:

[0049] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0050] According to the preset carrier amplitude and carrier frequency, the interference signal is amplitude modulated to output a single-frequency interference signal of the preset carrier frequency;

[0051] The time domain voltage signal of the preset position of the device simulation model is continuously acquired, and the time domain voltage signal is the result of the electric field radiation sensitivity simulation test. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 : A flow chart of a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0053] Figure 2 : A structural schematic diagram of a logarithmic periodic antenna model in a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0054] Figure 3 : Schematic diagram of a simulation test environment in a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0055] Figure 4 : A schematic diagram of using CST to calculate the electric field radiation sensitivity of EUT in a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0056] Figure 5 : A schematic diagram of the frequency domain voltage signal of a device simulation model in a sweep frequency mode in a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0057] Figure 6 : A schematic diagram of the time domain voltage signal of a device simulation model under a single-frequency interference mode in a simulation test method for electric field radiation sensitivity provided in an embodiment of the present application.

[0058] Figure 7 : A structural diagram of a simulation test system for electric field radiation sensitivity provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] 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.

[0060] It should be noted that the step numbers in the text are only for the convenience of explanation of the specific embodiments and do not serve to limit the order in which the steps are executed. In the description of this application, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0061] Embodiment 1:

[0062] like Figure 1As shown, embodiment 1 provides a simulation test method for electric field radiation sensitivity, including steps S1-S5:

[0063] Step S1, obtaining the target field strength of the interference source and the simulation parameters of the device under test;

[0064] Step S2: constructing a logarithmic periodic antenna model according to the target field strength, wherein the logarithmic periodic antenna model is a simulation model of a non-frequency-variable broadband antenna;

[0065] Step S3, constructing a device simulation model of the device under test according to the simulation parameters;

[0066] Step S4, importing the log-periodic antenna model and the device simulation model into a preset simulation test environment;

[0067] Step S5: In the simulation test environment, perform an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern.

[0068] The embodiment of the present application provides a simulation test method for electric field radiation sensitivity, which realizes the simulation test of electric field radiation sensitivity by constructing a logarithmic periodic antenna model for releasing interference signals and a device simulation model of the device to be tested, and importing the two models into a preset simulation test environment. Among them, in the selection of the simulation model of the interference source, the embodiment of the present application selects a simulation model of a non-frequency-variable broadband antenna. The non-frequency-variable broadband antenna has a wide-band characteristic, which means that it can provide a stable interference signal within a wider frequency range and can simulate interference conditions at multiple frequencies. Compared with the establishment of a plane wave as an interference source in the prior art, the embodiment of the present application improves the simulation test accuracy of electric field radiation sensitivity. Furthermore, thanks to the characteristics of the above-mentioned non-frequency-variable broadband antenna, the embodiment of the present application can select a variety of interference modes when conducting electric field radiation sensitivity simulation tests, thereby improving the comprehensiveness of the simulation test.

[0069] In a possible implementation manner, in step S2, constructing a logarithmic periodic antenna model according to the target field strength includes:

[0070] Constructing an initial logarithmic periodic antenna model according to preset initial parameters and antenna structure, wherein the preset initial parameters include antenna operating frequency range, length of each dipole, dipole spacing, and matching impedance;

[0071] Determining performance requirements of the log-periodic antenna model according to the target field strength, the performance requirements including a target standing wave ratio and a target antenna gain;

[0072] The initial log-periodic antenna model is iteratively optimized several times according to the target standing wave ratio and the target antenna gain, wherein in each iteration, the length of each vibrator and the vibrator spacing are adjusted according to the performance requirements until the current standing wave ratio and the current antenna gain of the initial log-periodic antenna model meet the performance requirements, thereby obtaining the log-periodic antenna model.

[0073] The embodiment of the present application provides a method for constructing a logarithmic periodic antenna model. First, based on preset parameters and antenna structure, an initial logarithmic periodic antenna model can be quickly obtained. Then, according to the performance requirements of the test items for the antenna, each test in the initial logarithmic periodic antenna model is optimized and adjusted through multiple iterations. Among them, in the process of optimizing and adjusting the antenna model, the vibrator length and vibrator spacing of the model are mainly adjusted. This is because in the logarithmic periodic antenna model, the signal is fed to each vibrator through a collection line, and each vibrator further amplifies the signal and radiates it to space. The amplified signals output by each vibrator interact with each other and eventually form an interference signal. Therefore, the vibrator length and vibrator spacing in the logarithmic periodic antenna model have the greatest impact on the performance of the antenna model, and mainly affect the standing wave ratio and antenna gain of the antenna. The embodiment of the present application can effectively change the standing wave ratio and antenna gain of the antenna model by optimizing and adjusting the vibrator length and vibrator spacing multiple times, so that the logarithmic periodic antenna model finally obtained meets the performance requirements of the simulation test, and further improves the accuracy of the simulation test.

[0074] In a preferred embodiment, the log-periodic antenna model is constructed as follows:

[0075] (1) The required operating frequency range of the preset antenna is 30MHz-1GHz.

[0076] (2) Calculate the length of each oscillator: The length of the oscillator will affect the standing wave ratio and gain of the antenna. The length of the oscillator decreases logarithmically, usually using the formula L n =L 0 ·r n , where L 0 is the length of the longest oscillator, preset L 0 The value is 1.73m, r is the proportional factor, and the preset value of r is 0.8. n is the serial number of the vibrator, and the preset value of n is 22. According to the formula, the lengths of each vibrator in the logarithmic periodic antenna can be calculated as follows:

[0077] L 0 =1.73m×0.8 0 ≈1.73m

[0078] L 1 =1.73m×0.8 1 ≈1.38m

[0079] …

[0080] L 22 =1.73m×0.8 22 ≈0.013m

[0081] (3) Calculate the dipole spacing (d): The dipole spacing affects the antenna's standing wave ratio and gain. It is usually 0.2 to 0.5 times the dipole length, and d is preset to 0.3L. n ,but:

[0082] d 0 =0.3L 0 =0.519

[0083] d 1 =0.3L 1 =0.414

[0084] …

[0085] d 21 =0.3L 21 =0.005

[0086] (4) Feeding point: Adjacent elements of the log-periodic antenna are cross-fed, and the feeding point is located at the end of the shortest element. In this embodiment, the feeding point of the antenna is realized by adding a discrete port at the end of the shortest element of the log-periodic antenna.

[0087] (5) Add a lumped port at one end of the longest oscillator and set the matching impedance to 50Ω.

[0088] (6) Model building: Use electromagnetic simulation software CST to build a three-dimensional model, input the length and spacing of the vibrator, and set the feeding port at the feeding point. The three-dimensional model is as follows: Figure 2 shown.

[0089] (7) Iterative optimization. After the logarithmic periodic antenna model is established according to the corresponding parameters, the standing wave ratio and antenna gain of the antenna are calculated by simulation according to the target field strength, and then the antenna performance is evaluated whether it meets the requirements. If not, it is necessary to adjust the antenna parameters and optimize the antenna simulation model until the antenna performance meets the requirements. The specific performance requirement for the antenna in this embodiment is that the radiation field strength of the antenna is 10V / m at a distance of 1m from the antenna. The evaluation index is achieved by establishing a Field Probe in the CST Microwave Studio and then changing the position of the field strength probe until the field strength amplitude monitored by the field strength probe is less than 10% of the target field strength.

[0090] In a possible implementation, in step S4, importing the log-periodic antenna model and the device simulation model into a preset simulation test environment includes:

[0091] Determine corresponding positions of the device simulation model and the log-periodic antenna model in the simulation test environment according to the simulation test requirements of the device under test, and import the log-periodic antenna model and the device simulation model into the corresponding positions respectively;

[0092] The simulation test environment is simulated and calibrated according to the target field strength and the interference pattern.

[0093] In a preferred embodiment, the simulation test environment is as follows: Figure 3 As shown, in the test layout model of EUT, a test table model is established. The test table is 90cm high, 300cm long, and 150cm wide. The corresponding materials of the test table are set in CST. A grounding plate model is established on the test table. The grounding plate is 300cm long, 150cm wide, and 0.2cm thick. The material of the grounding plate is set as PEC in CST. A lap copper plate model is established on the grounding plate. The grounding copper plate is 160cm long, 40cm wide, and 0.2cm thick. Six grounding copper plates are evenly arranged on the grounding plate. The material of the grounding copper plate is set as Cu in CST. A foam board model is established on the grounding plate. The foam board is 250cm long, 100cm wide, and 5cm thick. The corresponding materials of the foam board are set in CST. A cable model is established on the foam board. The cable type is set as bare wire in CST, and the cable length is 200cm. The left side of the cable is LISN, and the right side is EUT.

[0094] Further, the simulation calibration of the simulation test environment according to the target field strength and the interference pattern includes:

[0095] Determining a feeding port voltage of the log-periodic antenna model according to the target field strength;

[0096] An interference signal type of the log-periodic antenna model is determined according to the interference pattern.

[0097] In an embodiment of the present application, when importing a log-periodic antenna model and a device simulation model, the simulation test environment is simulated and calibrated according to the target field strength and interference pattern, and the feed port voltage and interference signal type of the log-periodic antenna model are determined, so that the log-periodic antenna model can output an interference signal of corresponding frequency and field strength during the simulation test, thereby further improving the accuracy of the simulation test.

[0098] In a preferred embodiment, determining the feeding port voltage of the log-periodic antenna model according to the target field strength is specifically:

[0099] To ensure that the field strength at a certain distance from the antenna is 10V / m, the feed port voltage of the log-periodic antenna model needs to be determined using the antenna factor. The antenna factor is the ratio of the electric field strength received near the antenna to the voltage generated at the antenna port. For example, CST can be used to calculate when the voltage at the antenna port is U 0 The electric field strength E received near the antenna 0 , then the electric field strength received near the antenna should be E = 10V / m. At this time, the voltage at the antenna port can be calculated using the formula Right now Figure it out.

[0100] Furthermore, when the interference mode is a single-frequency interference mode, it is also necessary to perform amplitude modulation (AM) on the interference signal emitted by the antenna model during the simulation test. The modulation formula of the AM signal can be expressed by the following formula:

[0101] s(t)=(A+m(t))cos(2πf c t)

[0102] Where s(t) is the modulated AM signal, A is the carrier amplitude, m(t) is the modulated signal, i.e. the interference signal, cos(2πf c t) is the carrier signal, where f c is the carrier frequency.

[0103] Let m(t) = A m cos(2πf m t)

[0104] Among them, A m is the amplitude of the modulating signal; f m is the frequency of the modulating signal.

[0105] Substituting the above modulation signal into the modulation formula of the AM signal, we can get:

[0106] s(t)=(A+A m cos(2πf m t))cos(2πf c t)

[0107] In a possible implementation, in step S5, when the interference mode is a frequency sweep mode, performing an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment includes:

[0108] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0109] Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency;

[0110] The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0111] In an embodiment of the present application, when the interference mode is a sweep mode, the antenna model automatically and continuously changes the frequency of the output signal within a specified frequency range, and obtains the frequency domain voltage signal of the device simulation model at different frequencies, thereby evaluating the electric field radiation sensitivity of the device under test based on the frequency domain voltage signal. In the sweep mode, the frequency of the output signal can be changed automatically and continuously without manual adjustment, which greatly improves the test efficiency. At the same time, the frequency range and step of the test can be precisely controlled to ensure the accuracy of the test results. Finally, the sweep mode can cover a wide frequency range, thereby comprehensively evaluating the electric field radiation sensitivity of the device under test at different frequencies.

[0112] In a preferred embodiment, the simulation frequency is set to 0 GHz-1 GHz in CST 3D Studio; appropriate boundary conditions are set, usually open boundary, ie, open (add space); and the Hexahedral TLM solver is selected.

[0113] If the frequency sweep mode is used, first create an AC task in the CST 2D studio; then add the excitation voltage signal of the antenna feed port obtained after the simulation environment is calibrated to the antenna feed port; then use CST to perform simulation calculations in the frequency sweep mode; at this time, the excitation voltage signal will be fed to each oscillator through the collection line, and each oscillator will further amplify the signal and radiate it into space; finally, the frequency domain voltage signal sensed by the sensitive part of the device can be obtained.

[0114] If a single-frequency interference mode is used, it is necessary to first establish a transient task in CST, and then add the calibrated and modulated excitation voltage signal of the antenna feed port to the antenna feed port; then use CST to perform simulation calculations of the single-frequency interference mode; at this time, the excitation voltage signal will be fed to each oscillator through the collection line, and each oscillator will further amplify the signal and radiate it into space; finally, the time domain voltage signal sensed by the sensitive part of the equipment can be obtained. The schematic diagram of using CST to calculate the EUT electric field radiation sensitivity is shown in the figure. Figure 4 shown.

[0115] Through simulation, we can monitor the frequency domain voltage signals of key parts of the EUT obtained by the sweep frequency mode under the 10V / m electric field radiated by the logarithmic periodic antenna, such as Figure 5 As shown in the figure, the time domain voltage signal of the key parts of the EUT obtained by applying the interference mode at a single frequency point is as follows Figure 6 shown.

[0116] In a possible implementation, the log-periodic antenna model includes a collection line, a feeding port, a plurality of dipole element pairs and a lumped port;

[0117] The lengths of the oscillators in the same dipole oscillator pair are the same, and the lengths of the oscillators in different dipole oscillator pairs are different. The dipole oscillator pairs are arranged in order from long to short along the collection line according to the length of the oscillators, and are bilaterally symmetrical based on the collection line.

[0118] The two ends of the collective line are the feeding port and the lumped port respectively, wherein the dipole pair closest to the lumped port has the longest dipole length, and the dipole pair closest to the feeding port has the shortest dipole length.

[0119] The embodiment of the present application provides a model structure of a logarithmic periodic antenna model. The logarithmic periodic antenna itself can be divided into two parts. One part is called the collective line, which is responsible for feeding each vibrator, which is equivalent to a transmission line; the other part is the vibrator, which is used to guide and amplify electromagnetic waves, so that the electromagnetic signal received by the antenna is stronger. By establishing a feeding point on the antenna, the signal will be fed to each vibrator through the collective line, and each vibrator will further amplify the signal and radiate it into space. The logarithmic periodic antenna provided in the embodiment of the present application can ensure that the antenna has a small standing wave ratio and high gain by adjusting the vibrator length and the vibrator spacing; a large number of vibrators can ensure good directivity of the antenna; the feeding method and feeding point adopted can also ensure good directivity and standing wave ratio of the antenna.

[0120] Embodiment 2:

[0121] like Figure 7 As shown, the second embodiment provides a simulation test system for electric field radiation sensitivity, including an acquisition module 10, an antenna model construction module 20, a device model construction module 30, an import module 40 and a test module 50;

[0122] Wherein, the acquisition module 10 is used to obtain the target field strength of the interference source and the simulation parameters of the device under test;

[0123] The antenna model construction module 20 is used to construct a logarithmic periodic antenna model according to the target field strength, and the logarithmic periodic antenna model is a simulation model of a non-frequency-variable broadband antenna;

[0124] The device model building module 30 is used to build a device simulation model of the device under test according to the simulation parameters;

[0125] The import module 40 is used to import the log-periodic antenna model and the device simulation model into a preset simulation test environment;

[0126] The testing module 50 is used to perform an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern in the simulation test environment.

[0127] In a possible implementation manner, the antenna model construction module 20 constructs a logarithmic periodic antenna model according to the target field strength, including:

[0128] Constructing an initial logarithmic periodic antenna model according to preset initial parameters and antenna structure, wherein the preset initial parameters include antenna operating frequency range, length of each dipole, dipole spacing, and matching impedance;

[0129] Determining performance requirements of the log-periodic antenna model according to the target field strength, the performance requirements including a target standing wave ratio and a target antenna gain;

[0130] The initial log-periodic antenna model is iteratively optimized several times according to the target standing wave ratio and the target antenna gain, wherein in each iteration, the length of each vibrator and the vibrator spacing are adjusted according to the performance requirements until the current standing wave ratio and the current antenna gain of the initial log-periodic antenna model meet the performance requirements, thereby obtaining the log-periodic antenna model.

[0131] In a possible implementation, the import module 40 imports the log-periodic antenna model and the device simulation model into a preset simulation test environment, including:

[0132] Determine corresponding positions of the device simulation model and the log-periodic antenna model in the simulation test environment according to the simulation test requirements of the device under test, and import the log-periodic antenna model and the device simulation model into the corresponding positions respectively;

[0133] The simulation test environment is simulated and calibrated according to the target field strength and the interference pattern.

[0134] Further, the simulation calibration of the simulation test environment according to the target field strength and the interference pattern includes:

[0135] Determining a feeding port voltage of the log-periodic antenna model according to the target field strength;

[0136] An interference signal type of the log-periodic antenna model is determined according to the interference pattern.

[0137] In a possible implementation, when the interference mode is a frequency sweep mode, the test module 50 performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment, including:

[0138] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0139] Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency;

[0140] The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0141] In a possible implementation, when the interference mode is a single-frequency interference mode, the test module 50 performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment, including:

[0142] Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal;

[0143] According to the preset carrier amplitude and carrier frequency, the interference signal is amplitude modulated to output a single-frequency interference signal of the preset carrier frequency;

[0144] The time domain voltage signal of the preset position of the device simulation model is continuously acquired, and the time domain voltage signal is the result of the electric field radiation sensitivity simulation test.

[0145] In a possible implementation, the log-periodic antenna model includes a collection line, a feeding port, a plurality of dipole element pairs and a lumped port;

[0146] The lengths of the oscillators in the same dipole oscillator pair are the same, and the lengths of the oscillators in different dipole oscillator pairs are different. The dipole oscillator pairs are arranged in order from long to short along the collection line according to the length of the oscillators, and are bilaterally symmetrical based on the collection line.

[0147] The two ends of the collective line are the feeding port and the lumped port respectively, wherein the dipole pair closest to the lumped port has the longest dipole length, and the dipole pair closest to the feeding port has the shortest dipole length.

[0148] The embodiment of the present application provides a simulation test system for electric field radiation sensitivity, which realizes the simulation test of electric field radiation sensitivity by constructing a logarithmic periodic antenna model for releasing interference signals and a device simulation model of the device to be tested, and importing the two models into a preset simulation test environment. Among them, in the selection of the simulation model of the interference source, the embodiment of the present application selects a simulation model of a non-frequency-variable broadband antenna. The non-frequency-variable broadband antenna has a wide-band characteristic, which means that it can provide a stable interference signal within a wider frequency range and can simulate interference conditions at multiple frequencies. Compared with the establishment of a plane wave as an interference source in the prior art, the embodiment of the present application improves the simulation test accuracy of electric field radiation sensitivity. Furthermore, thanks to the characteristics of the above-mentioned non-frequency-variable broadband antenna, the embodiment of the present application can select a variety of interference modes when conducting electric field radiation sensitivity simulation tests, thereby improving the comprehensiveness of the simulation test.

[0149] The more detailed working principle and step flow of this embodiment can refer to, but are not limited to, the relevant records of Embodiment 1.

[0150] The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present application in detail. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A simulation test method for electric field radiation sensitivity, characterized in that: include: Obtain the target field strength of the interference source and the simulation parameters of the device under test; Constructing a logarithmic periodic antenna model according to the target field strength, wherein the logarithmic periodic antenna model is a simulation model of a non-frequency-variant broadband antenna; Constructing a device simulation model of the device under test according to the simulation parameters; Importing the log-periodic antenna model and the device simulation model into a preset simulation test environment; In the simulation test environment, an electric field radiation sensitivity simulation test is performed on the device simulation model based on a preset interference pattern.

2. A simulation test method for electric field radiation sensitivity according to claim 1, characterized in that: The step of constructing a logarithmic periodic antenna model according to the target field strength includes: Constructing an initial logarithmic periodic antenna model according to preset initial parameters and antenna structure, wherein the preset initial parameters include antenna operating frequency range, length of each dipole, dipole spacing, and matching impedance; Determining performance requirements of the log-periodic antenna model according to the target field strength, the performance requirements including a target standing wave ratio and a target antenna gain; The initial log-periodic antenna model is iteratively optimized several times according to the target standing wave ratio and the target antenna gain, wherein in each iteration, the length of each vibrator and the vibrator spacing are adjusted according to the performance requirements until the current standing wave ratio and the current antenna gain of the initial log-periodic antenna model meet the performance requirements, thereby obtaining the log-periodic antenna model.

3. The simulation test method of electric field radiation sensitivity according to claim 1, characterized in that: The step of importing the log-periodic antenna model and the device simulation model into a preset simulation test environment includes: Determine corresponding positions of the device simulation model and the log-periodic antenna model in the simulation test environment according to the simulation test requirements of the device under test, and import the log-periodic antenna model and the device simulation model into the corresponding positions respectively; The simulation test environment is simulated and calibrated according to the target field strength and the interference pattern.

4. A simulation test method for electric field radiation sensitivity according to claim 3, characterized in that: The performing simulation calibration on the simulation test environment according to the target field strength and the interference pattern includes: Determining a feeding port voltage of the log-periodic antenna model according to the target field strength; An interference signal type of the log-periodic antenna model is determined according to the interference pattern.

5. The simulation test method of electric field radiation sensitivity according to claim 1, characterized in that: When the interference mode is a frequency sweep mode, the electric field radiation sensitivity simulation test is performed on the device simulation model based on a preset interference mode in the simulation test environment, including: Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal; Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency; The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

6. The simulation test method for electric field radiation sensitivity according to claim 1, characterized in that: When the interference mode is a single-frequency interference mode, the electric field radiation sensitivity simulation test is performed on the device simulation model based on a preset interference mode in the simulation test environment, including: Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal; According to the preset carrier amplitude and carrier frequency, the interference signal is amplitude modulated to output a single-frequency interference signal of the preset carrier frequency; The time domain voltage signal of the preset position of the device simulation model is continuously acquired, and the time domain voltage signal is the result of the electric field radiation sensitivity simulation test.

7. A simulation test method for electric field radiation sensitivity according to any one of claims 1 to 6, characterized in that: The logarithmic periodic antenna model includes a collection line, a feeding port, a plurality of dipole element pairs and a lumped port; The lengths of the oscillators in the same dipole oscillator pair are the same, and the lengths of the oscillators in different dipole oscillator pairs are different. The dipole oscillator pairs are arranged in order from long to short along the collection line according to the length of the oscillators, and are bilaterally symmetrical based on the collection line. The two ends of the collective line are the feeding port and the lumped port respectively, wherein the dipole element pair closest to the lumped port has the longest element length, and the dipole element pair closest to the feeding port has the shortest element length.

8. A simulation test system for electric field radiation sensitivity, characterized in that: It includes an acquisition module, an antenna model building module, a device model building module, an import module and a test module; Wherein, the acquisition module is used to obtain the target field strength of the interference source and the simulation parameters of the device under test; The antenna model construction module is used to construct a logarithmic periodic antenna model according to the target field strength, and the logarithmic periodic antenna model is a simulation model of a non-frequency-variant broadband antenna; The device model building module is used to build a device simulation model of the device under test according to the simulation parameters; The import module is used to import the log-periodic antenna model and the device simulation model into a preset simulation test environment; The test module is used to perform an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference pattern in the simulation test environment.

9. The electric field radiation sensitivity simulation test system according to claim 8, characterized in that: When the interference mode is a frequency sweep mode, the test module performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment, including: Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal; Continuously changing the frequency of the interference signal according to a preset frequency sweep range and step, thereby outputting a variable frequency interference signal with a continuously changing frequency; The frequency domain voltage signal of the preset position of the device simulation model is continuously acquired, and the frequency domain voltage signal is the result of the electric field radiation sensitivity simulation test.

10. The electric field radiation sensitivity simulation test system according to claim 8, characterized in that: When the interference mode is a single-frequency interference mode, the test module performs an electric field radiation sensitivity simulation test on the device simulation model based on a preset interference mode in the simulation test environment, including: Applying a feeding port voltage to a feeding port in the log-periodic antenna model so that each oscillator in the log-periodic antenna model generates a corresponding electromagnetic wave, thereby outputting an interference signal; According to the preset carrier amplitude and carrier frequency, the interference signal is amplitude modulated to output a single-frequency interference signal of the preset carrier frequency; The time domain voltage signal of the preset position of the device simulation model is continuously acquired, and the time domain voltage signal is the result of the electric field radiation sensitivity simulation test.

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