A comprehensive determination method and system for the electromagnetic radiation blocking effect of a frequency-using device

Abstract

The present invention discloses a comprehensive determination method and system for the electromagnetic radiation blocking effect of a frequency-using device, which relates to the technical fields of blocking effect determination models and prediction and evaluation technologies. The method includes: determining the operating frequency point, single-frequency blocking sensitive frequency deviation range, and effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device; determining the normalized critical interference level, interference factor, and corresponding two-sided quantiles of the normal distribution of the target frequency-using device; determining the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device; obtaining the electromagnetic radiation spectrum distribution and noise electromagnetic radiation spectrum density of the working environment where the target frequency-using device is located; determining multiple third-order intermodulation signals; calculating the radio frequency blocking effect index of the target frequency-using device in the working environment; and determining whether the radio frequency blocking effect index is greater than or equal to 1. If so, the target frequency-using device is subject to blocking interference. The present invention improves the accuracy of predicting and evaluating the blocking effect of frequency-using devices.

Description

Technical Field

[0001] The present invention relates to the technical field of blocking effect determination models and prediction evaluations, and particularly to a comprehensive determination method and system for the electromagnetic radiation blocking effect of frequency-using devices. Background Technique

[0002] The rapid development of information technology is inseparable from the wide application of frequency-using devices. To achieve device interconnection and interoperability, the transmitting power of frequency-using devices has been continuously increased, and the receiving sensitivity has been further improved, which has exacerbated the complexity of the electromagnetic environment and the electromagnetic interference has become increasingly serious. To solve the technical problems of the adaptability test and evaluation of frequency-using devices in complex electromagnetic environments, research has been mainly carried out from three aspects: electromagnetic radiation effect modeling, prediction, and test evaluation, but the connection between them is relatively weak. Electromagnetic radiation effect modeling focuses on the quantitative calculation of field-line and field-circuit coupling, and has a relatively high accuracy for linear systems. Since it is difficult to accurately reflect the nonlinear response characteristics of frequency-using devices, it not only limits the improvement of the accuracy of field-circuit coupling calculation, but also cannot accurately map the mechanism of the blocking effect of frequency-using devices, making it difficult to accurately evaluate the adaptability of frequency-using devices to complex electromagnetic environments. There are many electromagnetic radiation effect prediction methods, which can generally be divided into two categories: "multi-criteria decision-making methods supported by scientific theories and expert experience" and "intelligent analysis decision-making methods supported by small-sample test data". The former lacks an accurate and reliable complex electromagnetic environment blocking effect model as a support, and the intervention of human factors has a great impact on the evaluation results. The accuracy of the latter is restricted by the test data that maps the technical characteristics of the tested devices. At present, the evaluation accuracy cannot meet the actual needs, but there is a large development space.

[0003] In the existing research on complex electromagnetic environment effect test and evaluation methods, the concept of an effect index is introduced to characterize the multi-variable problem of the complex electromagnetic environment blocking effect with the effect index. Starting from the nonlinearity of the transfer function and the mechanism of the blocking effect, three types of non-intermodulation multi-frequency blocking effect models, namely the effective value of the field strength, amplitude sensitivity, and multi-frequency insensitivity, are established. This modeling method can accurately map the mechanism of the blocking effect, but the applicable ranges of these three effect models are limited and cannot be used for the accurate prediction and evaluation of the blocking effect of frequency-using devices in all cases, directly affecting the accuracy of the prediction and evaluation of the blocking effect of frequency-using devices. Summary of the Invention

[0004] The object of the present invention is to provide a comprehensive determination method and system for the electromagnetic radiation blocking effect of frequency-using devices, which improves the accuracy of the prediction and evaluation of the blocking effect of frequency-using devices.

[0005] To achieve the above object, the present invention provides the following solution:

[0006] A comprehensive determination method for the electromagnetic radiation blocking effect of frequency-using devices, the method comprising:

[0007] Conduct a single - frequency electromagnetic radiation blocking effect test on the target frequency - using device to determine the operating frequency point, single - frequency blocking sensitive frequency deviation range, and the effective value of the single - frequency continuous - wave critical interference field strength of the target frequency - using device;

[0008] At the operating frequency point, conduct a sinusoidal amplitude - modulated electromagnetic radiation critical blocking effect test with a modulation depth of 100% on the target frequency - using device to determine the effective value of the critical interference field strength of the amplitude - modulated wave;

[0009] According to the effective value of the single - frequency continuous - wave critical interference field strength and the effective value of the critical interference field strength of the amplitude - modulated wave, determine the normalized critical interference level, interference factor, and the corresponding two - sided quantile of the normal distribution of the target frequency - using device;

[0010] Conduct a two - frequency electromagnetic radiation third - order intermodulation critical blocking effect test on the target frequency - using device to determine the third - order intermodulation blocking sensitive frequency deviation range of the target frequency - using device;

[0011] Obtain the electromagnetic radiation spectrum distribution and the noise electromagnetic radiation spectrum density of the working environment where the target frequency - using device is located;

[0012] Determine multiple first single - frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single - frequency interference signals are single - frequency interference signals in the electromagnetic radiation spectrum distribution;

[0013] Determine multiple second single - frequency interference signals according to all the first single - frequency interference signals and the third - order intermodulation blocking sensitive frequency deviation range;

[0014] Use the method of permutation and combination to combine all the second single - frequency interference signals to obtain multiple third - order intermodulation blocking interference frequency combination signals; the third - order intermodulation blocking interference frequency combination signals are composed of two or three of the second single - frequency interference signals;

[0015] Calculate the third - order intermodulation frequency of each third - order intermodulation blocking interference frequency combination signal;

[0016] Screen all the third - order intermodulation blocking interference frequency combination signals according to the third - order intermodulation frequency and the single - frequency blocking sensitive frequency deviation range to obtain multiple third - order intermodulation signals;

[0017] Determine the equivalent normalized interference signal according to all the first single - frequency interference signals and all the third - order intermodulation signals;

[0018] Determine the multi - frequency normalized interference level according to the equivalent normalized interference signal and the interference factor;

[0019] Calculate the radio frequency blocking effect index of the target frequency-using device in the working environment according to the multi-frequency normalized interference level, the normalized critical interference level, the two-sided quantile of the normal distribution, and the spectral density of the noise electromagnetic radiation;

[0020] Determine whether the radio frequency blocking effect index is greater than or equal to 1;

[0021] If so, the target frequency-using device is subject to blocking interference;

[0022] If not, the target frequency-using device is not subject to blocking interference.

[0023] Optionally, the single-frequency electromagnetic radiation blocking effect test on the target frequency-using device to determine the operating frequency point, the single-frequency blocking sensitive frequency deviation range, and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device specifically includes:

[0024] Conduct a single-frequency electromagnetic radiation blocking effect test on the target frequency-using device to determine the operating frequency point of the target frequency-using device and the critical blocking interference field strength corresponding to different radiation interference frequency deviations;

[0025] Draw a first variation curve according to the critical blocking interference field strength corresponding to the different radiation interference frequency deviations; the first variation curve is the variation curve of the critical blocking interference field strength with the radiation interference frequency deviation;

[0026] Determine the single-frequency blocking sensitive frequency deviation range and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device according to the first variation curve.

[0027] Optionally, the determination of the normalized critical interference level, the interference factor, and the corresponding two-sided quantile of the normal distribution of the target frequency-using device according to the effective value of the single-frequency continuous wave critical interference field strength and the effective value of the amplitude-modulated wave critical interference field strength specifically includes:

[0028] Calculate the ratio of the effective value of the single-frequency continuous wave critical interference field strength to the effective value of the amplitude-modulated wave critical interference field strength to obtain the ratio of the effective values;

[0029] Determine the normalized critical interference level, the interference factor, and the two-sided quantile of the normal distribution according to the ratio of the effective values.

[0030] Optionally, the two-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device specifically includes:

[0031] Conduct a two-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking interference factors corresponding to different radiation interference frequency deviations of the target frequency-using device;

[0032] Draw a second variation curve according to the third-order intermodulation blocking interference factors corresponding to the different radiation interference frequency offsets; the second variation curve is a curve of the third-order intermodulation blocking interference factor varying with the radiation interference frequency offset.

[0033] Determine the third-order intermodulation blocking sensitive frequency offset range according to the second variation curve.

[0034] Optionally, the determining the equivalent normalized interference signal according to all the first single-frequency interference signals and all the third-order intermodulation signals specifically includes:

[0035] Determine the third-order intermodulation blocking effect index of each of the third-order intermodulation signals.

[0036] Determine the equivalent normalized interference signal according to all the first single-frequency interference signals, the third-order intermodulation blocking effect indexes of all the third-order intermodulation signals, and the third-order intermodulation frequencies of all the third-order intermodulation signals.

[0037] Optionally, the screening all the third-order intermodulation blocking interference frequency combination signals according to the third-order intermodulation frequency and the single-frequency blocking sensitive frequency offset range to obtain a plurality of third-order intermodulation signals specifically includes:

[0038] Determine the third-order intermodulation blocking interference frequency combination signals whose third-order intermodulation frequencies are within the single-frequency blocking sensitive frequency offset range as third-order intermodulation signals.

[0039] Optionally, the calculating the radio frequency blocking effect index of the target frequency-using device in the working environment according to the multi-frequency normalized interference level, the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density specifically includes:

[0040] Calculate the multi-frequency blocking effect index according to the multi-frequency normalized interference level and the normalized critical interference level.

[0041] Calculate the noise electromagnetic radiation blocking effect index according to the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density.

[0042] Calculate the radio frequency blocking effect index according to the multi-frequency blocking effect index and the noise electromagnetic radiation blocking effect index.

[0043] A system for comprehensively determining the electromagnetic radiation blocking effect of a frequency-using device, the system includes:

[0044] A single-frequency test module, which is used to conduct a single-frequency electromagnetic radiation blocking effect test on a target frequency-using device to determine the operating frequency point, single-frequency blocking sensitive frequency deviation range, and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device;

[0045] A sine amplitude modulation test module, which is used to conduct a sine amplitude modulation electromagnetic radiation critical blocking effect test with a 100% modulation depth on the target frequency-using device at the operating frequency point to determine the effective value of the critical interference field strength of the amplitude-modulated wave;

[0046] A first parameter determination module, which is used to determine the normalized critical interference level, interference factor, and the corresponding two-sided quantile of the normal distribution of the target frequency-using device according to the effective value of the single-frequency continuous wave critical interference field strength and the effective value of the critical interference field strength of the amplitude-modulated wave;

[0047] A dual-frequency test module, which is used to conduct a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device;

[0048] An environmental parameter acquisition module, which is used to acquire the electromagnetic radiation spectrum distribution and the noise electromagnetic radiation spectrum density of the working environment where the target frequency-using device is located;

[0049] A first single-frequency interference signal determination module, which is used to determine a plurality of first single-frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single-frequency interference signal is a single-frequency interference signal in the electromagnetic radiation spectrum distribution;

[0050] A second single-frequency interference signal determination module, which is used to determine a plurality of second single-frequency interference signals according to all the first single-frequency interference signals and the third-order intermodulation blocking sensitive frequency deviation range;

[0051] An arrangement and combination module, which is used to combine all the second single-frequency interference signals by means of arrangement and combination to obtain a plurality of third-order intermodulation blocking interference frequency combination signals; the third-order intermodulation blocking interference frequency combination signal is composed of two or three of the second single-frequency interference signals;

[0052] A third-order intermodulation frequency calculation module, which is used to calculate the third-order intermodulation frequency of each of the third-order intermodulation blocking interference frequency combination signals;

[0053] A screening module, which is used to screen all the third-order intermodulation blocking interference frequency combination signals according to the third-order intermodulation frequency and the single-frequency blocking sensitive frequency deviation range to obtain a plurality of third-order intermodulation signals;

[0054] An equivalent normalized interference signal determination module, which is used to determine an equivalent normalized interference signal according to all the first single-frequency interference signals and all the third-order intermodulation signals;

[0055] A multi - frequency normalized interference level determination module for determining the multi - frequency normalized interference level according to the equivalent normalized interference signal and the interference factor;

[0056] A radio frequency blocking effect index calculation module for calculating the radio frequency blocking effect index of the target frequency - using device in the working environment according to the multi - frequency normalized interference level, the normalized critical interference level, the two - sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density;

[0057] A judgment module for judging whether the radio frequency blocking effect index is greater than or equal to 1;

[0058] A first output module for, if so, indicating that the target frequency - using device is subject to blocking interference;

[0059] A second output module for, if not, indicating that the target frequency - using device is not subject to blocking interference.

[0060] According to the specific embodiments provided by the present invention, the following technical effects are disclosed:

[0061] The present invention discloses a comprehensive determination method and system for the electromagnetic radiation blocking effect of a frequency - using device. Through single - frequency electromagnetic radiation blocking effect tests, sine - amplitude - modulated electromagnetic radiation critical blocking effect tests with a modulation depth of 100%, and two - frequency electromagnetic radiation third - order intermodulation critical blocking effect tests, based on single - frequency electromagnetic radiation, noise electromagnetic radiation, and third - order intermodulation signals, the radio frequency blocking effect index of the frequency - using device is calculated to determine whether the frequency - using device is subject to blocking interference. The present invention can be applied to the determination of the blocking effect of frequency - using devices in any situation, improving the accuracy of the prediction and evaluation of the blocking effect of frequency - using devices. Brief Description of the Drawings

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following - described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0063] Figure 1 It is a schematic flowchart of the comprehensive determination method for the electromagnetic radiation blocking effect of a frequency - using device provided by the embodiment of the present invention;

[0064] Figure 2 It is the first change curve graph;

[0065] Figure 3 For E ame / E sine And the normalized critical interference level value U n, interference factor α and the corresponding two-sided quantile x of the normal distribution a relation diagram;

[0066] Figure 4 is the variation relation diagram of the third-order intermodulation blocking interference factor of the tested navigation receiver with the positive radiation frequency offset;

[0067] Figure 5 is the variation relation diagram of the third-order intermodulation blocking interference factor of the tested navigation receiver with the negative radiation frequency offset;

[0068] Figure 6 is the schematic structural diagram of the comprehensive determination system for the electromagnetic radiation blocking effect of the frequency-using device provided by the embodiment of the present invention. Specific Embodiment

[0069] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0070] The purpose of the present invention is to provide a comprehensive determination method and system for the electromagnetic radiation blocking effect of a frequency-using device, aiming to improve the accuracy of predicting and evaluating the blocking effect of the frequency-using device.

[0071] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0072] Figure 1 is the schematic flow diagram of the comprehensive determination method for the electromagnetic radiation blocking effect of the frequency-using device provided by the embodiment of the present invention. As Figure 1 shown, the comprehensive determination method for the electromagnetic radiation blocking effect of the frequency-using device in this embodiment includes:

[0073] Step 101: Determine the operating frequency point, single-frequency blocking sensitive frequency offset range, and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device.

[0074] Step 101 specifically includes:

[0075] Conduct a single-frequency electromagnetic radiation blocking effect test on the target frequency-using device to determine the operating frequency point, single-frequency blocking sensitive frequency offset range, and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device.

[0076] As an alternative implementation, a single-frequency electromagnetic radiation blocking effect test is conducted on the target frequency-using device to determine the operating frequency point, the single-frequency blocking sensitive frequency deviation range, and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device, specifically including:

[0077] Conduct a single-frequency electromagnetic radiation blocking effect test on the target frequency-using device to determine the operating frequency point of the target frequency-using device and the critical blocking interference field strength corresponding to different radiation interference frequency deviations.

[0078] According to the critical blocking interference field strength corresponding to different radiation interference frequency deviations, draw a first variation curve; the first variation curve is the curve of the critical blocking interference field strength varying with the radiation interference frequency deviation.

[0079] According to the first variation curve, determine the single-frequency blocking sensitive frequency deviation range and the effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device.

[0080] As a specific embodiment, set the broadcast frequency band of the satellite navigation simulator to the Beidou B1 frequency band, and use the full-level irradiation method to test the single-frequency electromagnetic radiation critical interference field strength of the tested navigation receiver. The first variation curve is as shown in Figure 2 When the frequency deviation is within ±2 MHz, the navigation receiver is most sensitive to electromagnetic radiation, and its critical interference field strength is the smallest at the operating frequency point and is almost symmetric about the operating frequency point when deviating from the operating frequency point; when the frequency deviation is in the range of 2 - 18 MHz and 19 - 56 MHz, the sensitivity shows two steps and is relatively sensitive to electromagnetic radiation; when the radiation frequency deviation (frequency deviation) is greater than 60 MHz or less than -23 MHz, the tested navigation receiver has strong anti-electromagnetic interference ability.

[0081] Step 102: Determine the normalized critical interference level, interference factor, and the corresponding two-sided quantile of the normal distribution of the target frequency-using device.

[0082] Step 102 specifically includes:

[0083] Step 1021: At the operating frequency point, conduct a sinusoidal amplitude modulation electromagnetic radiation critical blocking effect test with a modulation depth of 100% on the target frequency-using device to determine the effective value of the critical interference field strength of the amplitude-modulated wave.

[0084] Step 1022: According to the effective value of the single-frequency continuous wave critical interference field strength and the effective value of the critical interference field strength of the amplitude-modulated wave, determine the normalized critical interference level, interference factor, and the two-sided quantile of the normal distribution of the target frequency-using device.

[0085] As a specific embodiment, an amplitude-modulated wave with a 100% modulation depth is a typical three-frequency signal. Based on the test data of the critical blocking effect of the amplitude-modulated wave of the target frequency-using device and the single-frequency (same as the carrier frequency of the amplitude-modulated wave) continuous-wave electromagnetic radiation, the instantaneous values of the critical interference field strengths of the amplitude-modulated wave and the single-frequency continuous wave are respectively normalized so that the normalized critical interference level values U n , interference factor α are the same, and the effective value ratio E ame / E sine of the critical interference field strengths of the sinusoidal amplitude-modulated wave and the single-frequency continuous wave can be obtained. The corresponding normalized critical interference level value U n , the value of the interference factor α are shown in Table 1.

[0086] Table 1 Relationship between E ame / E sin and model parameters

[0087]

[0088]

[0089] According to the data in Table 1, the relationship between E ame / E sine and the normalized critical interference level value U n , interference factor α and the corresponding two-sided quantile x a of the normal distribution is as shown in Figure 3 . The normalized critical interference level value U n , the two-sided quantile x a of the normal distribution decrease monotonically with the increase of the value of E ame / E sine , while the interference factor α increases monotonically with the increase of the value of E ame / E sine .

[0090] Near the working frequency point of the tested navigation receiver, electromagnetic radiation blocking effect tests of single-frequency and sinusoidal amplitude-modulated waves with a 100% modulation depth are respectively carried out. The single frequency is the same as the carrier frequency of the amplitude-modulated wave, and the modulation frequency is set to 1 kHz. The blocking interference field strength is tested and determined, and the value of E ame / E sine is calculated. By referring to Table 1, the normalized critical interference level U n , interference factor α and the corresponding two-sided quantile x a of the normal distribution are determined. The results are listed in Table 2. In the test environment, when the navigation signals are -128 dBW, -120 dBW and -110 dBW, -80 dBW respectively, the tested navigation receiver should respectively conform to the field strength amplitude-sensitive, effective value-sensitive or multi-frequency insensitive electromagnetic radiation blocking effect models given by the mechanism modeling.

[0091] Table 2 Model parameters under different navigation signal powers

[0092]

[0093] As an alternative implementation, step 1022 specifically includes:

[0094] Calculate the ratio of the effective value of the critical interference field strength of the single-frequency continuous wave to the effective value of the critical interference field strength of the amplitude-modulated wave to obtain the ratio of the effective values.

[0095] Determine the normalized critical interference level, interference factor, and two-sided quantile of the normal distribution according to the ratio of the effective values.

[0096] Step 103: Determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device.

[0097] Step 103 specifically includes:

[0098] Conduct a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device.

[0099] As an alternative implementation, conduct a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device, specifically including:

[0100] Conduct a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking interference factors corresponding to different radiation interference frequency deviations of the target frequency-using device.

[0101] Draw a second variation curve according to the third-order intermodulation blocking interference factors corresponding to different radiation interference frequency deviations; the second variation curve is a curve of the third-order intermodulation blocking interference factor changing with the radiation interference frequency deviation.

[0102] Determine the third-order intermodulation blocking sensitive frequency deviation range according to the second variation curve.

[0103] Step 104: Obtain the electromagnetic radiation spectrum distribution and noise electromagnetic radiation spectrum density of the working environment where the target frequency-using device is located.

[0104] Step 105: Determine multiple third-order intermodulation signals.

[0105] Step 105 specifically includes:

[0106] Step 1051: Determine multiple first single-frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single-frequency interference signals are single-frequency interference signals in the electromagnetic radiation spectrum distribution.

[0107] Step 1052: Determine a plurality of second single-frequency interference signals according to all the first single-frequency interference signals and the third-order intermodulation blocking sensitivity frequency deviation range.

[0108] Step 1053: Use the method of permutation and combination to combine all the second single-frequency interference signals to obtain a plurality of third-order intermodulation blocking interference frequency combination signals; the third-order intermodulation blocking interference frequency combination signals are composed of two or three second single-frequency interference signals.

[0109] Step 1054: Calculate the third-order intermodulation frequency of each third-order intermodulation blocking interference frequency combination signal.

[0110] Step 1055: Screen all the third-order intermodulation blocking interference frequency combination signals according to the third-order intermodulation frequency and the single-frequency blocking sensitivity frequency deviation range to obtain a plurality of third-order intermodulation signals.

[0111] As an alternative implementation, step 1055 specifically includes:

[0112] Determine the third-order intermodulation blocking interference frequency combination signals whose third-order intermodulation frequencies are within the single-frequency blocking sensitivity frequency deviation range as third-order intermodulation signals.

[0113] Step 106: Calculate the radio frequency blocking effect index of the target frequency-using device in the working environment.

[0114] Step 106 specifically includes:

[0115] Step 1061: Determine the equivalent normalized interference signal according to all the first single-frequency interference signals and all the third-order intermodulation signals.

[0116] Step 1062: Determine the multi-frequency normalized interference level according to the equivalent normalized interference signal and the interference factor.

[0117] Step 1063: Calculate the radio frequency blocking effect index of the target frequency-using device in the working environment according to the multi-frequency normalized interference level, the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density.

[0118] As an alternative implementation, step 1061 specifically includes:

[0119] Determine the third-order intermodulation blocking effect index of each third-order intermodulation signal.

[0120] Determine the equivalent normalized interference signal according to all the first single-frequency interference signals, the third-order intermodulation blocking effect indexes of all the third-order intermodulation signals, and the third-order intermodulation frequencies of all the third-order intermodulation signals.

[0121] Specifically, the calculation formula of the equivalent normalized interference signal is:

[0122]

[0123] Among them, u F (t) is the equivalent normalized interference signal, and E i is the amplitude of the electric field strength of the first single-frequency interference signal at the antenna of the frequency-using device, ω i is the angular frequency of the first single-frequency interference signal, R 3j is the third-order intermodulation blocking effect index of the third-order intermodulation signal, f 3j is the third-order intermodulation frequency of the third-order intermodulation signal, i is the order of the first single-frequency interference signal, and j is the order of the third-order intermodulation signal.

[0124] Among them, the third-order intermodulation signal includes two forms: the dual-frequency third-order signal and the triple-frequency third-order signal:

[0125] For any order of the dual-frequency third-order signal, For any order of the triple-frequency third-order intermodulation signal,

[0126] Among them, R3(f) is the third-order intermodulation blocking effect index, α1, α2, and α3 are the third-order intermodulation blocking interference factors corresponding to the out-of-band frequency points f1, f2, and f3 respectively, and E 00 , E f0 , E 10 , E 20 and, E 30 are the single-frequency critical blocking interference field strengths corresponding to the operating frequency point f0 of the target frequency-using device, the third-order intermodulation frequency point f, the out-of-band frequency points f1, f2, and f3 respectively, and E1, E2, and E3 are the radiation interference field strengths corresponding to the out-of-band frequency points f1, f2, and f3 respectively.

[0127] To determine the third-order intermodulation blocking interference factor of the target frequency-using device, first, three out-of-band interference frequency points need to be selected at equal frequency intervals as the basic frequency points, so that the third-order intermodulation signal frequencies of their pairwise combinations fall within the sensitive operating frequency band of the tested frequency-using device. Through 3 groups of critical blocking effect tests, according to calculation, the third-order intermodulation blocking interference factors of the 3 basic frequency points are determined simultaneously. Then, use the basic frequency points or other frequency points with known third-order intermodulation blocking interference factors to combine with the out-of-band interference frequencies of the third-order intermodulation blocking interference factors to be measured, so that the third-order intermodulation frequency falls within the single-frequency blocking sensitive operating frequency band of the tested frequency-using device. Through the critical blocking effect test, the third-order intermodulation blocking interference factor of the frequency point to be measured is determined; and so on, the variation relationship of the third-order intermodulation blocking interference factor of the target frequency-using device with the radiation interference frequency offset is determined.

[0128] Figure 4 , Figure 5The figure shows the variation relationships of the third-order intermodulation blocking interference factor of the tested navigation receiver with positive and negative radiation frequency offsets respectively. The third-order intermodulation blocking sensitive radiation frequency offset range is determined to be approximately -100 MHz to -9 MHz and 36 MHz to 72 MHz according to the interference factor being greater than 2.

[0129] As an alternative implementation manner, step 1063 specifically includes:

[0130] Calculate the multi-frequency blocking effect index according to the multi-frequency normalized interference level and the normalized critical interference level.

[0131] Calculate the noise electromagnetic radiation blocking effect index according to the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density.

[0132] Calculate the radio frequency blocking effect index according to the multi-frequency blocking effect index and the noise electromagnetic radiation blocking effect index.

[0133] Specifically, the calculation formula for the radio frequency blocking effect index is:

[0134]

[0135] Specifically, the calculation formula for the multi-frequency blocking effect index is:

[0136] R M =U a / U n (3)

[0137] Wherein, R M is the multi-frequency blocking effect index, U a is the multi-frequency normalized interference level, U n is the normalized critical interference level.

[0138] The calculation formula for the noise electromagnetic radiation blocking effect index is:

[0139]

[0140] Wherein, R N is the noise electromagnetic radiation blocking effect index, x a is the two-sided quantile of the normal distribution, U n is the normalized critical interference level, j is the serial number of the sampling point of the noise, n is the maximum value of the serial number of the sampling point of the noise, G(f j ) is the ratio of the spectrum analyzer reading to the detection bandwidth, P i0 (f j ) is the antenna receiving power corresponding to the single-frequency critical interference field strength of the target frequency-using device, Δf j is the frequency interval of the sampling point.

[0141] Among them, the derivation process of formula (4) is as follows:

[0142] Since the amplitude and phase of the noise vary randomly, the field strengths of noises at different frequencies cannot be directly superimposed. Instead, starting from the spectral distribution of the random noise, the effect modeling must be carried out using statistical theory.

[0143] If the spectral density function of the noise electric field strength is E(f), and it follows a normal distribution with a variance of at the frequency point f and varies with time, the contribution of the noise electromagnetic radiation in the frequency band of f~f+df to the multi-frequency blocking interference effect index of the target frequency-using device depends on its normalized electric field strength E(f)df / E i0 (f), which follows a Gaussian distribution with a mean of 0 and a variance of . Its probability density function is:

[0144]

[0145] The random noise interference can be regarded as the combined action of infinitely many single-frequency (narrowband) interferences. According to the probability distribution theorem, the linear combination of a finite number of independent random variables that follow a Gaussian distribution still follows a Gaussian distribution. Therefore, the normalized noise amplitude U follows a Gaussian distribution with a mean of 0 and a variance of σ *2 . Its probability density function is:

[0146]

[0147]

[0148] According to the properties of the normal distribution, the normalized noise electric field amplitude with a probability greater than α is the normalized noise interference level value U a corresponding to the upper α / 2 quantile: If the power spectrum G(f) of the noise electromagnetic radiation is measured with a spectrum analyzer in combination with an antenna, and the antenna received power corresponding to the single-frequency critical interference field strength E i0 (f) of the target frequency-using device is P i0 (f j ), then:

[0149]

[0150] Combined with formula (3), formula (4) can be obtained.

[0151] Step 107: Determine whether the RF blocking effect index is greater than or equal to 1.

[0152] Step 108: If so, the target frequency-using device is under blocking interference.

[0153] Step 109: If not, the target frequency-using device is not under blocking interference.

[0154] If not, the target frequency-using device is not subject to blocking interference and is operating normally.

[0155] Figure 6 It is a schematic structural diagram of a comprehensive determination system for the electromagnetic radiation blocking effect of a frequency-using device provided by an embodiment of the present invention. As Figure 6 shown, the comprehensive determination system for the electromagnetic radiation blocking effect of the frequency-using device in this embodiment includes:

[0156] A single-frequency test module 201, configured to perform a single-frequency electromagnetic radiation blocking effect test on the target frequency-using device to determine the operating frequency point, single-frequency blocking sensitive frequency deviation range, and effective value of the single-frequency continuous wave critical interference field strength of the target frequency-using device.

[0157] A sine amplitude modulation test module 202, configured to perform a sine amplitude modulation electromagnetic radiation critical blocking effect test with a 100% modulation depth on the target frequency-using device at the operating frequency point to determine the effective value of the critical interference field strength of the amplitude-modulated wave.

[0158] A first parameter determination module 203, configured to determine the normalized critical interference level, interference factor, and corresponding two-sided quantiles of the normal distribution of the target frequency-using device according to the effective value of the single-frequency continuous wave critical interference field strength and the effective value of the critical interference field strength of the amplitude-modulated wave.

[0159] A dual-frequency test module 204, configured to perform a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range and the third-order intermodulation blocking interference factor corresponding to different radiation interference frequency deviations of the target frequency-using device.

[0160] An environmental parameter acquisition module 205, configured to acquire the electromagnetic radiation spectrum distribution and the noise electromagnetic radiation spectrum density of the working environment where the target frequency-using device is located.

[0161] A first single-frequency interference signal determination module 206, configured to determine a plurality of first single-frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single-frequency interference signals are single-frequency interference signals in the electromagnetic radiation spectrum distribution.

[0162] A second single-frequency interference signal determination module 207, configured to determine a plurality of second single-frequency interference signals according to all the first single-frequency interference signals and the third-order intermodulation blocking sensitive frequency deviation range.

[0163] An arrangement and combination module 208, configured to combine all the second single-frequency interference signals by means of arrangement and combination to obtain a plurality of third-order intermodulation blocking interference frequency combination signals; the third-order intermodulation blocking interference frequency combination signals are composed of two or three second single-frequency interference signals.

[0164] A third-order intermodulation frequency calculation module 209, configured to calculate the third-order intermodulation frequency of each third-order intermodulation blocking interference frequency combination signal.

[0165] A screening module 210, configured to screen all third-order intermodulation blocking interference frequency combination signals according to the third-order intermodulation frequency and the single-frequency blocking sensitive frequency deviation range, so as to obtain a plurality of third-order intermodulation signals.

[0166] An equivalent normalized interference signal determination module 211, configured to determine an equivalent normalized interference signal according to all first single-frequency interference signals and all third-order intermodulation signals.

[0167] A multi-frequency normalized interference level determination module 212, configured to determine a multi-frequency normalized interference level according to the equivalent normalized interference signal and the interference factor.

[0168] A radio frequency blocking effect index calculation module 213, configured to calculate a radio frequency blocking effect index of a target frequency-using device in a working environment according to the multi-frequency normalized interference level, the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density.

[0169] A judgment module 214, configured to judge whether the radio frequency blocking effect index is greater than or equal to 1.

[0170] A first output module 215, configured to, if so, indicate that the target frequency-using device is blocked by interference;

[0171] A second output module 216, configured to, if not, indicate that the target frequency-using device is not blocked by interference.

[0172] In the present specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0173] Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A comprehensive determination method for the electromagnetic radiation blocking effect of a frequency-using device, characterized in that, The method includes: Conduct a single - frequency electromagnetic radiation blocking effect test on the target frequency - using device to determine the operating frequency point, single - frequency blocking - sensitive frequency deviation range, and the effective value of the single - frequency continuous - wave critical interference field strength of the target frequency - using device; At the operating frequency point, conduct a sinusoidal amplitude - modulated electromagnetic radiation critical blocking effect test with a 100% modulation depth on the target frequency - using device to determine the effective value of the amplitude - modulated wave critical interference field strength; According to the effective value of the single - frequency continuous - wave critical interference field strength and the effective value of the amplitude - modulated wave critical interference field strength, determine the normalized critical interference level, interference factor, and the corresponding two - sided quantile of the normal distribution of the target frequency - using device; Conduct a two - frequency electromagnetic radiation third - order intermodulation critical blocking effect test on the target frequency - using device to determine the third - order intermodulation blocking - sensitive frequency deviation range of the target frequency - using device; Obtain the electromagnetic radiation spectrum distribution and the noise electromagnetic radiation spectrum density of the working environment where the target frequency - using device is located; Determine a plurality of first single - frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single - frequency interference signals are single - frequency interference signals in the electromagnetic radiation spectrum distribution; Determine a plurality of second single - frequency interference signals according to all the first single - frequency interference signals and the third - order intermodulation blocking - sensitive frequency deviation range; Using the permutation and combination method, combine all the second single - frequency interference signals to obtain a plurality of third - order intermodulation blocking interference frequency combination signals; the third - order intermodulation blocking interference frequency combination signals are composed of two or three of the second single - frequency interference signals; Calculate the third - order intermodulation frequency of each of the third - order intermodulation blocking interference frequency combination signals; Screen all the third - order intermodulation blocking interference frequency combination signals according to the third - order intermodulation frequency and the single - frequency blocking - sensitive frequency deviation range to obtain a plurality of third - order intermodulation signals; Determine the equivalent normalized interference signal according to all the first single - frequency interference signals and all the third - order intermodulation signals; Determine the multi - frequency normalized interference level according to the equivalent normalized interference signal and the interference factor; Calculate the radio - frequency blocking effect index of the target frequency - using device in the working environment according to the multi - frequency normalized interference level, the normalized critical interference level, the two - sided quantile of the normal distribution, and the noise electromagnetic radiation spectrum density; Judge whether the radio - frequency blocking effect index is greater than or equal to 1; If so, the target frequency - using device is subject to blocking interference; If not, the target frequency - using device is not subject to blocking interference.

2. The comprehensive determination method of the electromagnetic radiation blocking effect of the frequency-using device according to claim 1, wherein, The step of conducting a single - frequency electromagnetic radiation blocking effect test on the target frequency - using device to determine the operating frequency point, single - frequency blocking - sensitive frequency deviation range, and the effective value of the single - frequency continuous - wave critical interference field strength of the target frequency - using device specifically includes: Conduct a single - frequency electromagnetic radiation blocking effect test on the target frequency - using device to determine the operating frequency point of the target frequency - using device and the critical blocking interference field strength corresponding to different radiation interference frequency deviations; Draw a first variation curve according to the critical blocking interference field strength corresponding to different radiation interference frequency deviations; the first variation curve is a curve of the critical blocking interference field strength changing with the radiation interference frequency deviation; Determine the single - frequency blocking sensitive frequency deviation range and the effective value of the single - frequency continuous - wave critical interference field strength of the target frequency - using device according to the first change curve.

3. The comprehensive determination method of the electromagnetic radiation blocking effect of the frequency-using device according to claim 1, characterized in that, Determine the normalized critical interference level, interference factor, and corresponding two - sided quantile of the normal distribution of the target frequency - using device according to the effective value of the single - frequency continuous - wave critical interference field strength and the effective value of the amplitude - modulated wave critical interference field strength. Specifically, it includes: Calculate the ratio of the effective value of the single - frequency continuous - wave critical interference field strength to the effective value of the amplitude - modulated wave critical interference field strength to obtain the ratio of effective values. Determine the normalized critical interference level, the interference factor, and the two - sided quantile of the normal distribution according to the ratio of effective values.

4. The comprehensive determination method for the electromagnetic radiation blocking effect of a frequency-using device according to claim 1, wherein Conduct a two - frequency electromagnetic radiation third - order intermodulation critical blocking effect test on the target frequency - using device to determine the third - order intermodulation blocking sensitive frequency deviation range of the target frequency - using device. Specifically, it includes: Conduct a two - frequency electromagnetic radiation third - order intermodulation critical blocking effect test on the target frequency - using device to determine the third - order intermodulation blocking interference factor corresponding to different radiation interference frequency deviations of the target frequency - using device. Draw a second change curve according to the third - order intermodulation blocking interference factor corresponding to different radiation interference frequency deviations; the second change curve is a curve of the third - order intermodulation blocking interference factor changing with the radiation interference frequency deviation. Determine the third - order intermodulation blocking sensitive frequency deviation range according to the second change curve.

5. The comprehensive determination method for the electromagnetic radiation blocking effect of a frequency-using device according to claim 1, characterized in that, Determine the equivalent normalized interference signal according to all the first single - frequency interference signals and all the third - order intermodulation signals. Specifically, it includes: Determine the third - order intermodulation blocking effect index of each third - order intermodulation signal. Determine the equivalent normalized interference signal according to all the first single - frequency interference signals, the third - order intermodulation blocking effect indexes of all the third - order intermodulation signals, and the third - order intermodulation frequencies of all the third - order intermodulation signals.

6. The comprehensive determination method of the electromagnetic radiation blocking effect of a frequency-using device according to claim 1, characterized in that Screen all the third - order intermodulation blocking interference frequency combination signals according to the third - order intermodulation frequency and the single - frequency blocking sensitive frequency deviation range to obtain multiple third - order intermodulation signals. Specifically, it includes: Determine the third - order intermodulation blocking interference frequency combination signals whose third - order intermodulation frequencies are within the single - frequency blocking sensitive frequency deviation range as third - order intermodulation signals.

7. The comprehensive determination method of the electromagnetic radiation blocking effect of a frequency-using device according to claim 1, characterized in that, Calculate the radio - frequency blocking effect index of the target frequency - using device in the working environment according to the multi - frequency normalized interference level, the normalized critical interference level, the two - sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density. Specifically, it includes: Calculate the multi - frequency blocking effect index according to the multi - frequency normalized interference level and the normalized critical interference level. Calculate the noise electromagnetic radiation blocking effect index according to the normalized critical interference level, the two - sided quantile of the normal distribution, and the noise electromagnetic radiation spectral density. Calculate the radio - frequency blocking effect index according to the multi - frequency blocking effect index and the noise electromagnetic radiation blocking effect index.

8. A comprehensive determination system for the electromagnetic radiation blocking effect of a frequency-using device, characterized in that, The system includes: A single - frequency test module, which is used to conduct a single - frequency electromagnetic radiation blocking effect test on the target frequency - using device to determine the operating frequency point, single - frequency blocking sensitive frequency deviation range, and the effective value of the single - frequency continuous - wave critical interference field strength of the target frequency - using device. A sine amplitude modulation test module, which is used to perform a sine amplitude modulation electromagnetic radiation critical blocking effect test with an amplitude modulation depth of 100% on the target frequency-using device at the working frequency point to determine the effective value of the critical interference field strength of the amplitude-modulated wave; A first parameter determination module, which is used to determine the normalized critical interference level, interference factor, and corresponding two-sided quantile of the normal distribution of the target frequency-using device according to the effective value of the critical interference field strength of the single-frequency continuous wave and the effective value of the critical interference field strength of the amplitude-modulated wave; A dual-frequency test module, which is used to perform a dual-frequency electromagnetic radiation third-order intermodulation critical blocking effect test on the target frequency-using device to determine the third-order intermodulation blocking sensitive frequency deviation range of the target frequency-using device; An environmental parameter acquisition module, which is used to acquire the electromagnetic radiation spectrum distribution and the noise electromagnetic radiation spectrum density of the working environment where the target frequency-using device is located; A first single-frequency interference signal determination module, which is used to determine a plurality of first single-frequency interference signals according to the electromagnetic radiation spectrum distribution; the first single-frequency interference signal is a single-frequency interference signal in the electromagnetic radiation spectrum distribution; A second single-frequency interference signal determination module, which is used to determine a plurality of second single-frequency interference signals according to all the first single-frequency interference signals and the third-order intermodulation blocking sensitive frequency deviation range; An arrangement and combination module, which is used to combine all the second single-frequency interference signals by means of arrangement and combination to obtain a plurality of third-order intermodulation blocking interference frequency combination signals; the third-order intermodulation blocking interference frequency combination signal is composed of two or three of the second single-frequency interference signals; A third-order intermodulation frequency calculation module, which is used to calculate the third-order intermodulation frequency of each of the third-order intermodulation blocking interference frequency combination signals; A screening module, which is used to screen all the third-order intermodulation blocking interference frequency combination signals according to the third-order intermodulation frequency and the single-frequency blocking sensitive frequency deviation range to obtain a plurality of third-order intermodulation signals; An equivalent normalized interference signal determination module, which is used to determine an equivalent normalized interference signal according to all the first single-frequency interference signals and all the third-order intermodulation signals; A multi-frequency normalized interference level determination module, which is used to determine the multi-frequency normalized interference level according to the equivalent normalized interference signal and the interference factor; A radio frequency blocking effect index calculation module, which is used to calculate the radio frequency blocking effect index of the target frequency-using device in the working environment according to the multi-frequency normalized interference level, the normalized critical interference level, the two-sided quantile of the normal distribution, and the noise electromagnetic radiation spectrum density; A judgment module, which is used to judge whether the radio frequency blocking effect index is greater than or equal to 1; A first output module, which is used to output that the target frequency-using device is blocked by interference if it is; A second output module, which is used to output that the target frequency-using device is not blocked by interference if it is not.

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