Targeted electromagnetic protection method based on electromagnetic vulnerability and computer device

Abstract

The invention relates to the field of electromagnetic protection, in particular to a targeted electromagnetic protection method based on electromagnetic vulnerability and a computer device, solves the problems of troubleshooting and treatment of electromagnetic vulnerability hidden dangers of an electronic information system, and greatly improves the electromagnetic protection capability. The method comprises the following steps: acquiring electromagnetic emission characteristics of the electronic information system, analyzing an electromagnetic interference physical mechanism from the electromagnetic emission characteristics, namely analyzing the composition of a tested object, acquiring electromagnetic emission characteristic test points, sequentially carrying out electromagnetic emission characteristic test on each test point, acquiring emission characteristic data, and analyzing the electromagnetic emission characteristic data. Obtaining an electromagnetic interference physical mechanism of the tested object; designing different vulnerability test waveforms according to an electromagnetic interference physical mechanism, and obtaining vulnerability thresholds under different parameters; and finally, setting a corresponding electromagnetic protection index according to the obtained vulnerable threshold. The invention is suitable for electromagnetic protection.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic protection, and in particular to a targeted electromagnetic protection method and a computer device based on electromagnetic vulnerability. Background Art

[0002] Under the trend of informatization, electromagnetic interference has become one of the important issues that affect the normal performance of electronic information systems. At present, the system-level electromagnetic vulnerability point inspection and management of electronic information systems is still mainly carried out by traversal method, which is to shut down all devices or modules that may cause electromagnetic vulnerability one by one to find possible interference source devices. When faced with a complex system with thousands of electromagnetic transmitting devices, this one-by-one traversal method takes a lot of time and is difficult to implement.

[0003] The fundamental reason why a large number of electromagnetic vulnerability problems are difficult to solve is that there is a lack of mechanism support for electromagnetic vulnerability investigation and diagnosis methods, and there are no standardized targeted investigation and diagnosis methods. How to systematically solve the electromagnetic vulnerability problem of electronic information systems has become a difficult problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a targeted electromagnetic protection method and computer device based on electromagnetic vulnerability, which solves the problem of troubleshooting and management of electromagnetic vulnerability hazards in electronic information systems and greatly improves the electromagnetic protection capability.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose. In a first aspect, the present invention provides a targeted electromagnetic protection method based on electromagnetic vulnerability, comprising:

[0006] S1. Obtain the electromagnetic emission characteristics of the electronic information system and analyze the physical mechanism of electromagnetic interference from the electromagnetic emission characteristics;

[0007] S2. According to the physical mechanism of electromagnetic interference, different vulnerability test waveforms are designed to obtain vulnerability thresholds under different parameters;

[0008] S3. Set corresponding electromagnetic protection indicators according to the obtained vulnerability threshold.

[0009] Furthermore, step S1 specifically includes:

[0010] S101. Analyze the composition of the test product and obtain the electromagnetic emission characteristic test points;

[0011] S102, conducting electromagnetic emission characteristic tests at each test point in turn to obtain emission characteristic data;

[0012] S103. Analyze the electromagnetic emission characteristic data to obtain the physical mechanism of electromagnetic interference of the test product.

[0013] Furthermore, step S101 specifically includes:

[0014] If the test product has a chassis structure, analyze the characteristics of the chassis structure of the test product, identify the size and physical position of the holes and slits in the chassis, and mark them in descending order according to the maximum size of the holes and slits as the first test point, the second test point, ..., the nth test point of the first type of test point. If different holes and slits are in the same plane, select the largest hole and slit in the plane as the test point;

[0015] Analyze the characteristics of the interconnection cables of the tested products, and sort them into the first test point, the second test point, ..., the nth test point of the second category test points according to the importance of the signal line, control line, power line, and RF signal line. If they are in the same harness, they are marked as one test point according to the highest priority.

[0016] Analyze the characteristics of the internal boards or circuit modules of the test product, and rank the first test point, the second test point, ..., the nth test point marked as the third category test points in order according to the importance of the digital signal processing board, the analog signal processing board, the power supply board, and the RF signal processing board, and on the board according to the importance of the control and processing chip pins, the clock module pins, and the power conversion chip pins.

[0017] Furthermore, step S102 specifically includes:

[0018] For the first test point, the second test point, ..., and the nth test point of the first type of test point, a typical antenna sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out radiation emission tests to obtain radiation emission characteristic data of the test product, and the obtained radiation emission characteristic data is corrected in combination with the antenna sensor characteristics;

[0019] For the first test point, the second test point, ..., and the nth test point of the second type of test points, a typical caliper probe sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out conducted emission tests to obtain the conducted emission characteristic data of the test product, and the obtained conducted emission characteristic data is corrected in combination with the characteristics of the caliper probe sensor;

[0020] For the first test point, the second test point, ..., and the nth test point of the third type of test points, near-field emission tests are carried out in sequence using typical near-field probe sensors, low-noise amplifiers, and signal receiving devices to obtain near-field emission characteristic data of the test product, and data correction is performed on the obtained near-field emission characteristic data in combination with the characteristics of the near-field probe sensor.

[0021] Furthermore, step S103 specifically includes:

[0022] Separation of broadband components and detail components: separation of broadband and detail components for the radiated emission, conducted emission, and near-field emission characteristic data obtained from the test;

[0023] Identify mismatched electromagnetic interference mechanisms, extract broadband mismatch parameters, use a combination function of multiple mismatched structure transmission characteristics to fit broadband components, and obtain broadband mismatch characteristic parameters;

[0024] Identify the broadband comb spectrum interference mechanism, extract the broadband periodic excitation source parameters, use the mixed combination function of multiple broadband periodic excitation sources, fit the frequency point sequence with amplitude values ​​greater than the threshold in the narrowband component, obtain the fundamental frequency of the periodic pulse signal, and the fundamental frequency of the periodic trapezoidal wave signal, and arrange the obtained fundamental frequencies in order of size, give the original broadband periodic excitation source fundamental frequency parameters, remove the repeated fundamental frequencies and the fundamental frequency values ​​close to the set range, and give the final broadband periodic excitation source fundamental frequency parameter list;

[0025] Identify the narrowband frequency interference mechanism, extract the narrowband excitation source parameters, remove the frequency and its harmonic frequency amplitude values ​​corresponding to the fundamental frequency parameters of the original broadband periodic excitation source in the detail component, find the frequency points with amplitudes greater than the threshold among the remaining frequency points, arrange the frequency points in order of amplitude size, and give the final narrowband excitation source parameter list.

[0026] Furthermore, step S2 specifically includes:

[0027] S201, obtaining an electromagnetic vulnerability threshold for mismatch electromagnetic interference;

[0028] Based on the obtained broadband mismatch characteristic parameters, an arbitrary waveform generator is used to sort the central frequencies from low to high to generate a periodic damped signal. The periodic damped signal is used as an excitation signal to carry out vulnerability tests on the first, second and third test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the mismatch signal.

[0029] S202, obtaining a vulnerability threshold for broadband comb spectrum interference;

[0030] Based on the obtained broadband periodic excitation source parameters, an arbitrary waveform generator is used to generate a corresponding broadband pulse signal. The broadband pulse signal is used as the excitation signal to carry out vulnerability tests on the first, second and third test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the broadband comb spectrum interference signal.

[0031] S203, obtaining a vulnerability threshold for narrowband point-frequency interference;

[0032] Based on the acquired narrowband excitation source parameters, an arbitrary waveform generator is used to generate the corresponding continuous wave signal. Taking the continuous wave signal as the excitation signal, vulnerability tests are carried out on the first, second and third test points to obtain the vulnerability thresholds of the test items at different coupling channels under the excitation of narrowband point frequency signals.

[0033] In a second aspect, the present invention provides a computer device, including a memory, wherein the memory stores program instructions, and when the program instructions are executed, the above-mentioned targeted electromagnetic protection method based on electromagnetic vulnerability is executed.

[0034] The beneficial effects of the present invention are:

[0035] The present invention first obtains the electromagnetic emission characteristics of the electronic information system, analyzes the physical mechanism of electromagnetic interference from the electromagnetic emission results, and then designs different vulnerability test waveforms according to the physical mechanism of electromagnetic interference of the electronic information system, obtains vulnerability thresholds under different parameters, and finally proposes electromagnetic protection indicators according to the vulnerability parameters and vulnerability thresholds. The present invention makes full use of the effective information in the electromagnetic emission spectrum of the electronic information system, obtains the interference mechanism of the test product through spectrum feature analysis, and designs different vulnerability test excitation signals based on this for targeted testing. Compared with the traditional method of checking one by one by trial and error, the judgment method based on physical mechanism provided by the present invention can greatly improve the efficiency and accuracy of electromagnetic vulnerability judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of a targeted electromagnetic protection method based on electromagnetic vulnerability provided by an embodiment of the present invention;

[0037] Figure 2 It is a flow chart of different stages of a targeted electromagnetic protection method based on electromagnetic vulnerability provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] The present invention provides a targeted electromagnetic protection method based on electromagnetic vulnerability, such as Figure 1 As shown, including:

[0040] S1. Obtain the electromagnetic emission characteristics of the electronic information system and analyze the physical mechanism of electromagnetic interference from the electromagnetic emission characteristics;

[0041] Step S1 specifically includes:

[0042] S101. Analyze the composition of the test product and obtain the electromagnetic emission characteristic test points;

[0043] If the test product has a chassis structure, analyze the structural characteristics of the chassis of the test product, identify the size and physical position of the holes and slits of the chassis, and mark them in descending order as the first test point, the second test point, ..., the nth test point of the first type of test point according to the maximum size of the holes and slits (such as the bevel, diameter, and long slit). If different holes and slits are in the same plane, select the largest hole and slit in the plane as the test point;

[0044] Analyze the characteristics of the interconnected cables of the tested products, and sort them into the first test point, the second test point, ..., the nth test point of the second category test points according to the importance of the signal line, control line, power line, and RF signal line. If cables of different types cannot be separated, that is, they are in the same harness, they are marked as one test point according to the highest priority.

[0045] Analyze the characteristics of the internal boards or circuit modules of the test product, and rank the first test point, the second test point, ..., the nth test point marked as the third category test points in order according to the importance of the digital signal processing board, analog signal processing board, power board, and RF signal processing board, and on the boards according to the importance of the control and processing chip pins, clock module pins, and power conversion chip pins. Modules on the same board are given priority.

[0046] S102, conducting electromagnetic emission characteristic tests at each test point in turn to obtain emission characteristic data;

[0047] For the first test point, the second test point, ..., and the nth test point of the first type of test point, a typical antenna sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out radiation emission tests to obtain radiation emission characteristic data of the test product, and the obtained radiation emission characteristic data is corrected in combination with the antenna sensor characteristics;

[0048] For the first test point, the second test point, ..., and the nth test point of the second type of test points, a typical caliper probe sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out conducted emission tests to obtain the conducted emission characteristic data of the test product, and the obtained conducted emission characteristic data is corrected in combination with the characteristics of the caliper probe sensor;

[0049] For the first test point, the second test point, ..., and the nth test point of the third type of test points, near-field emission tests are carried out in sequence using typical near-field probe sensors, low-noise amplifiers, and signal receiving devices to obtain near-field emission characteristic data of the test product, and data correction is performed on the obtained near-field emission characteristic data in combination with the characteristics of the near-field probe sensor.

[0050] S103, analyzing electromagnetic emission characteristic data to obtain the physical mechanism of electromagnetic interference of the test product;

[0051] Separation of broadband components and detail components: separation of broadband and detail components for the radiated emission, conducted emission, and near-field emission characteristic data obtained from the test;

[0052] Identify the mismatch electromagnetic interference mechanism, extract broadband mismatch parameters, use the combination function of multiple mismatch structure transmission characteristics (mainly the spectrum characteristics of single damped pulse signal) to fit the broadband component, and obtain the broadband mismatch characteristic parameters, including center frequency, bandwidth, attenuation coefficient, etc.

[0053] Identify the broadband comb spectrum interference mechanism, extract the broadband periodic excitation source parameters, use a mixed combination function of multiple broadband periodic excitation sources (mainly periodic pulse signals and periodic trapezoidal wave signals), fit the frequency point sequence with amplitude values ​​greater than the threshold in the narrowband component, obtain the fundamental frequency of the periodic pulse signal, and the fundamental frequency of the periodic trapezoidal wave signal, and arrange the obtained fundamental frequencies in order of size, give the original broadband periodic excitation source fundamental frequency parameters (including repeated fundamental frequencies), eliminate repeated fundamental frequencies and fundamental frequency values ​​close to the set range (such as 5%, 6%, 7%, etc.), and give the final broadband periodic excitation source fundamental frequency parameter list;

[0054] Identify the narrowband frequency interference mechanism, extract the narrowband excitation source parameters, remove the frequency and its harmonic frequency amplitude values ​​corresponding to the fundamental frequency parameters of the original broadband periodic excitation source in the detail component, find the frequency points with amplitudes greater than the threshold among the remaining frequency points, arrange the frequency points in order of amplitude size, and give the final narrowband excitation source parameter list.

[0055] S2. According to the physical mechanism of electromagnetic interference, different vulnerability test waveforms are designed to obtain vulnerability thresholds under different parameters;

[0056] Step S2 specifically includes:

[0057] S201, obtaining an electromagnetic vulnerability threshold for mismatch electromagnetic interference;

[0058] Based on the obtained broadband mismatch characteristic parameters (including center frequency, bandwidth, attenuation coefficient, etc.), an arbitrary waveform generator is used to sort the center frequencies from low to high to generate a periodic damping signal. The periodic damping signal is used as an excitation signal to carry out vulnerability tests on the first, second and third test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the mismatch signal.

[0059] S202, obtaining a vulnerability threshold for broadband comb spectrum interference;

[0060] Based on the obtained broadband periodic excitation source parameters (including rising edge, repetition frequency, etc.), an arbitrary waveform generator is used to generate a corresponding broadband pulse signal. The broadband pulse signal is used as an excitation signal to carry out vulnerability tests on the first type of test points, the second type of test points, and the third type of test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the broadband comb spectrum interference signal;

[0061] S203, obtaining a vulnerability threshold for narrowband point-frequency interference;

[0062] Based on the acquired narrowband excitation source parameters (frequency), an arbitrary waveform generator is used to generate the corresponding continuous wave signal. Taking the continuous wave signal as the excitation signal, vulnerability tests are carried out on the first, second and third test points to obtain the vulnerability thresholds of the test object at different coupling channels under the excitation of the narrowband point frequency signal.

[0063] S3. Set corresponding electromagnetic protection indicators according to the obtained vulnerability threshold.

[0064] According to the test and analysis of step S1, the physical waveform and its time-frequency domain parameters related to the electromagnetic inherent properties of the test object can be obtained; according to the test and analysis of step S2, the sensitivity threshold of the test object under the injection of the above-mentioned waveforms can be obtained. These two types of information provide a basis for the electromagnetic protection parameters of the test object and can support the corresponding electromagnetic protection design.

[0065] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A targeted electromagnetic protection method based on electromagnetic vulnerability, characterized in that: include: S1. Obtain the electromagnetic emission characteristics of the electronic information system and analyze the physical mechanism of electromagnetic interference from the electromagnetic emission characteristics; S2. According to the physical mechanism of electromagnetic interference, different vulnerability test waveforms are designed to obtain vulnerability thresholds under different parameters; S3. Set corresponding electromagnetic protection indicators according to the obtained vulnerability threshold.

2. The targeted electromagnetic protection method based on electromagnetic vulnerability according to claim 1, characterized in that: Step S1 specifically includes: S101. Analyze the composition of the test product and obtain the electromagnetic emission characteristic test points; S102, conducting electromagnetic emission characteristic tests at each test point in turn to obtain emission characteristic data; S103. Analyze the electromagnetic emission characteristic data to obtain the physical mechanism of electromagnetic interference of the test product.

3. The targeted electromagnetic protection method based on electromagnetic vulnerability according to claim 2, characterized in that: Step S101 specifically includes: If the test product has a chassis structure, analyze the characteristics of the chassis structure of the test product, identify the size and physical position of the holes and slits in the chassis, and mark them in descending order according to the maximum size of the holes and slits as the first test point, the second test point, ..., the nth test point of the first type of test point. If different holes and slits are in the same plane, select the largest hole and slit in the plane as the test point; Analyze the characteristics of the interconnection cables of the tested products, and sort them into the first test point, the second test point, ..., the nth test point of the second category test points according to the importance of the signal line, control line, power line, and RF signal line. If they are in the same harness, they are marked as one test point according to the highest priority. Analyze the characteristics of the internal boards or circuit modules of the test product, and rank the first test point, the second test point, ..., the nth test point marked as the third category test points in order according to the importance of the digital signal processing board, the analog signal processing board, the power supply board, and the RF signal processing board, and on the board according to the importance of the control and processing chip pins, the clock module pins, and the power conversion chip pins.

4. The targeted electromagnetic protection method based on electromagnetic vulnerability according to claim 3, characterized in that: Step S102 specifically includes: For the first test point, the second test point, ..., and the nth test point of the first type of test point, a typical antenna sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out radiation emission tests to obtain radiation emission characteristic data of the test product, and the obtained radiation emission characteristic data is corrected in combination with the antenna sensor characteristics; For the first test point, the second test point, ..., and the nth test point of the second type of test points, a typical caliper probe sensor, a low noise amplifier, and a signal receiving device are used to sequentially carry out conducted emission tests to obtain the conducted emission characteristic data of the test product, and the obtained conducted emission characteristic data is corrected in combination with the characteristics of the caliper probe sensor; For the first test point, the second test point, ..., and the nth test point of the third type of test points, near-field emission tests are carried out in sequence using typical near-field probe sensors, low-noise amplifiers, and signal receiving devices to obtain near-field emission characteristic data of the test product, and data correction is performed on the obtained near-field emission characteristic data in combination with the characteristics of the near-field probe sensor.

5. The targeted electromagnetic protection method based on electromagnetic vulnerability according to claim 4, characterized in that: Step S103 specifically includes: Separation of broadband components and detail components: separation of broadband and detail components for the radiated emission, conducted emission, and near-field emission characteristic data obtained from the test; Identify mismatched electromagnetic interference mechanisms, extract broadband mismatch parameters, use a combination function of multiple mismatched structure transmission characteristics to fit broadband components, and obtain broadband mismatch characteristic parameters; Identify the broadband comb spectrum interference mechanism, extract the broadband periodic excitation source parameters, use the mixed combination function of multiple broadband periodic excitation sources, fit the frequency point sequence with amplitude values ​​greater than the threshold in the narrowband component, obtain the fundamental frequency of the periodic pulse signal, and the fundamental frequency of the periodic trapezoidal wave signal, and arrange the obtained fundamental frequencies in order of size, give the original broadband periodic excitation source fundamental frequency parameters, remove the repeated fundamental frequencies and the fundamental frequency values ​​close to the set range, and give the final broadband periodic excitation source fundamental frequency parameter list; Identify the narrowband frequency interference mechanism, extract the narrowband excitation source parameters, remove the frequency and its harmonic frequency amplitude values ​​corresponding to the fundamental frequency parameters of the original broadband periodic excitation source in the detail component, find the frequency points with amplitudes greater than the threshold among the remaining frequency points, arrange the frequency points in order of amplitude size, and give the final narrowband excitation source parameter list.

6. The targeted electromagnetic protection method based on electromagnetic vulnerability according to claim 5, characterized in that: Step S2 specifically includes: S201, obtaining an electromagnetic vulnerability threshold for mismatch electromagnetic interference; Based on the obtained broadband mismatch characteristic parameters, an arbitrary waveform generator is used to sort the central frequencies from low to high to generate a periodic damped signal. The periodic damped signal is used as an excitation signal to carry out vulnerability tests on the first, second and third test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the mismatch signal. S202, obtaining a vulnerability threshold for broadband comb spectrum interference; Based on the obtained broadband periodic excitation source parameters, an arbitrary waveform generator is used to generate a corresponding broadband pulse signal. The broadband pulse signal is used as the excitation signal to carry out vulnerability tests on the first, second and third test points to obtain the vulnerability thresholds of the test product at different coupling channels under the excitation of the broadband comb spectrum interference signal. S203, obtaining a vulnerability threshold for narrowband point-frequency interference; Based on the acquired narrowband excitation source parameters, an arbitrary waveform generator is used to generate the corresponding continuous wave signal. Taking the continuous wave signal as the excitation signal, vulnerability tests are carried out on the first, second and third test points to obtain the vulnerability thresholds of the test items at different coupling channels under the excitation of narrowband point frequency signals.

7. A computer device comprising a memory, wherein the memory stores program instructions, characterized in that: When the program instructions are executed, the targeted electromagnetic protection method based on electromagnetic vulnerability as described in any one of claims 1 to 6 is executed.

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