Cavity single-aperture coupling field distribution equivalent excitation test method, device and system

Abstract

The invention provides a cavity single-aperture coupling field distribution equivalent excitation test method, device and system, and relates to the field of electromagnetic environment monitoring. The method comprises the steps that when the input power of a radiating antenna is gradually adjusted to first power, the target response of a monitoring probe in a tested cavity under a far-field irradiation test is acquired, and the tested cavity is a metal cavity; shortening the distance between the radiating antenna and the aperture on the tested cavity, and obtaining a first response of the monitoring probe in the tested cavity under the equivalent irradiation test when the input power of the radiating antenna is gradually adjusted to second power after the distance is shortened; and when the first response is equal to the target response, completing the equivalent excitation test process of the tested cavity. The test efficiency, scientificity and accuracy can be improved.

Description

Technical Field

[0001] This application relates to the field of electromagnetic environment monitoring, and in particular to a method, apparatus and system for testing the equivalent excitation of coupled field distribution in a single-hole slit cavity. Background Technology

[0002] With the increasing number of high-power frequency-using equipment and the rapid development of electromagnetic offensive weapons, the electromagnetic environment within the limited space of the future informationized battlefield will become increasingly harsh. As a crucial component of the battlefield electromagnetic environment, strong radio frequency (RF) fields can be generated by numerous devices, including friendly high-power radars, communication systems, high-power microwave systems, electronic countermeasures systems, and enemy electromagnetic offensive weapons. Their wide radiation bandwidth, high intensity, and broad impact have made them one of the most severe challenges facing future informationized warfare. Our equipment faces the real problem of being susceptible to electromagnetic interference (damage) under the influence of strong RF fields, leading to reduced combat performance and even loss of combat effectiveness. To understand the performance baseline of equipment and accurately assess its survivability in the threat of strong RF fields, it is urgently necessary to conduct RF field electromagnetic environment effect tests on the equipment.

[0003] Currently, the radiated field strength of high-power transmitters, including land-based, shipborne, and airborne transmitters, can reach tens of thousands of volts per meter (for example, the peak field strength of the main beam of a transmitter in the 2.7-3.6 GHz band or the external electromagnetic environment of an army helicopter, as specified in the electromagnetic compatibility requirements of GJB1389A-2005, is as high as 27,460 V / m). The radiated power of high-power microwave weapons (narrowband) has increased to the gigawatt level. However, under domestic laboratory conditions, the simulated sinusoidal continuous wave radiated field strength is generally 1,000 V / m (around 300 V / m or lower for some microwave bands), and the radiated power of high-power microwave test systems (narrowband) is generally in the megawatt level, and is basically at a fixed frequency. Therefore, using a single full-level radiation effect test method under laboratory conditions is no longer sufficient to meet the technical requirements for testing the effects of radio frequency strong field electromagnetic environments. Summary of the Invention

[0004] This application provides a method, apparatus, and system for testing equivalent excitation of cavity single-hole slot coupling field distribution, in order to solve the problem that the existing single full-level laying effect test cannot meet the technical requirements of radio frequency strong field electromagnetic environment effect test.

[0005] In a first aspect, this application provides an equivalent excitation test method for the coupled field distribution of a single-hole slit in a cavity, including: When the input power of the radiating antenna is gradually adjusted to the first power, the target response of the monitoring probe in the test cavity under the far-field irradiation test is obtained, wherein the test cavity is a metal cavity; The distance between the radiating antenna and the aperture on the test cavity is shortened, and after the distance is shortened, the input power of the radiating antenna is gradually adjusted to the second power to obtain the first response of the monitoring probe in the test cavity under the equivalent irradiation test. When the first response equals the target response, the equivalent excitation test process of the test cavity is completed.

[0006] Secondly, this application provides an equivalent excitation test device for the coupled field distribution of a cavity single-hole slit, comprising: The target response determination module is used to acquire the target response of the monitoring probe in the test cavity under far-field irradiation test when the input power of the radiating antenna is gradually adjusted to the first power. The test cavity is a metal cavity. The first response determination module is used to shorten the distance between the radiating antenna and the aperture on the test cavity, and after shortening the distance, gradually adjust the input power of the radiating antenna to the second power to obtain the first response of the monitoring probe in the test cavity under the equivalent irradiation test. The test completion module is used to complete the equivalent excitation test process of the test cavity when the first response is equal to the target response.

[0007] Thirdly, this application provides an equivalent excitation test system for coupled field distribution in a cavity with a single aperture slit, which applies the equivalent excitation test method for coupled field distribution in a cavity with a single aperture slit as described in the first aspect. The system includes: Anechoic chamber, coaxial cable, radiating antenna, metal cavity, monitoring probe, optical fiber, directional coupler, power amplifier, signal generator, power meter and computer; The coaxial cable, the radiating antenna, the metal cavity, the monitoring probe, and the optical fiber are all housed within the anechoic chamber. The first end of the coaxial line is connected to the radiating antenna, and the second end of the coaxial line is connected to the first end of a directional coupler disposed outside the anechoic chamber. The second end of the directional coupler is connected to the power meter, and the third end of the directional coupler is connected to the output end of the power amplifier; The output terminal of the signal generator is connected to the input terminal of the power amplifier; The optical fiber is used to connect the monitoring probe installed in the anechoic chamber to the computer installed outside the anechoic chamber.

[0008] This application provides a method, apparatus, and system for equivalent excitation testing of the coupled field distribution of a cavity with a single aperture. The method involves gradually adjusting the input power of a radiating antenna to a first power to obtain the target response of a monitoring probe within the tested cavity under far-field irradiation testing. The tested cavity is a metal cavity. The distance between the radiating antenna and the aperture on the tested cavity is shortened, and after shortening the distance, the input power of the radiating antenna is gradually adjusted to a second power to obtain the first response of the monitoring probe within the tested cavity under equivalent irradiation testing. When the first response equals the target response, the equivalent excitation test process of the tested cavity is completed. This application, by gradually adjusting the power and comparing the responses, can more quickly find the equivalent excitation conditions, greatly reducing the number of experiments, saving experimental time, and improving overall experimental efficiency. Furthermore, by explicitly stating that the experiment ends when the first response equals the target response, a clear termination condition is provided, avoiding over- or under-testing that may occur in traditional methods due to a lack of clear judgment criteria. This allows the experiment to achieve the expected goals efficiently and accurately. Simultaneously, during the experiment, the two key variables—the input power of the radiating antenna and the distance between the antenna and the aperture—are clearly controlled. By gradually adjusting and precisely acquiring the response, the interference of other uncertainties on the experimental results is reduced, making the experimental results more accurately reflect the influence of the studied variables (power and distance) on the single-aperture coupling excitation of the metal cavity, thus improving the scientific rigor and accuracy of the experiment. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of the equivalent excitation test system for cavity single-hole slit coupled field distribution under far-field irradiation test provided in the embodiments of this application; Figure 2 This is a schematic diagram of the equivalent excitation test system for cavity single-hole slit coupled field distribution under near-field irradiation test provided in the embodiments of this application; Figure 3 This is a schematic diagram of the equivalent excitation test system for cavity single-slot coupling field distribution under the equivalent irradiation test of electric dipole antenna provided in the embodiments of this application; Figure 4 This is a schematic flowchart of the equivalent excitation test method for the coupling field distribution of a single-hole slit in a cavity provided in the embodiments of this application; Figure 5 This is a diagram of the experimental error of a near-field irradiation experiment under horizontal polarization provided in an embodiment of this application; Figure 6 This is a test error diagram of near-field irradiation under vertical polarization provided in the embodiments of this application; Figure 7 This is a test error diagram for the rectangular narrow slit case provided in the embodiments of this application; Figure 8 This is a test error diagram of the internal electric dipole equivalent irradiation test provided in the embodiments of this application; Figure 9 This is a schematic diagram of the equivalent excitation test device for cavity single-hole slit coupling field distribution provided in the embodiments of this application. Detailed Implementation

[0011] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0012] To make the objectives, technical solutions, and advantages of this application clearer, the following description will be provided in conjunction with the accompanying drawings and specific embodiments.

[0013] From an electromagnetic protection perspective, an ideal shield is a closed structure, which provides the best shielding effect. However, equipment inside the cavity has requirements for ventilation, heat dissipation, signal transmission, and manufacturing processes. Various openings and gaps inevitably appear on the equipment casing, such as ventilation and heat dissipation arrays, display windows, equipment gaps, and openings reserved for cables running through the casing. Therefore, at certain frequency bands, these openings and gaps may become the main coupling channels for electromagnetic interference. Researching equivalent excitation methods for the field distribution within the cavity using openings and gaps as coupling paths can provide a technical approach for proposing equivalent test methods for strong-field electromagnetic environment effects using openings and gaps as the main coupling path, thus providing a new technical means for assessing the strong-field electromagnetic environment effects of equipment.

[0014] This application employs far-field irradiation tests and near-field equivalent irradiation tests to achieve an equivalent normalized field distribution within the metal cavity. When the same radiating antenna is used for both the far-field and equivalent irradiation tests, the equivalent irradiation test has higher utilization efficiency of the radiated antenna power; that is, under the same antenna excitation power, the equivalent irradiation test generates a stronger electromagnetic field within the metal cavity. To obtain the equivalent correspondence between the far-field and equivalent irradiation tests, a monitoring probe with negligible influence on the field distribution within the metal cavity can be placed near the sensitive electronic device. The probe's response is acquired during both far-field and equivalent irradiation tests. The input power of the radiating antenna during the equivalent irradiation test is adjusted until the probe's response is equal to that during far-field irradiation, thus obtaining the equivalent correspondence between the input power of the radiating antenna during far-field and equivalent irradiation tests.

[0015] Figure 1 This is a schematic diagram of the equivalent excitation test system for cavity single-hole slit coupled field distribution provided in this application embodiment. The system includes: An anechoic chamber 1, a coaxial cable 2, a radiating antenna 3, a metal cavity 4 (i.e., the cavity under test), a monitoring probe 5, an optical fiber 6, a directional coupler 7, a power amplifier 8, a signal generator 9, a power meter 10, and a computer 11.

[0016] The coaxial cable 2, radiating antenna 3, metal cavity 4, monitoring probe 5, and optical fiber 6 are all installed in the anechoic chamber 1.

[0017] The first end of the coaxial line 2 is connected to the radiating antenna 3, and the second end of the coaxial line 2 is connected to the first end of the directional coupler 7 located outside the anechoic chamber 1.

[0018] The second end of the directional coupler 7 is connected to the power meter 10, and the third end of the directional coupler 7 is connected to the output of the power amplifier 8.

[0019] The output of signal generator 9 is connected to the input of power amplifier 8.

[0020] Fiber optic cable 6 is used to connect the monitoring probe 5, which is installed inside the anechoic chamber 1, to the computer 11, which is installed outside the anechoic chamber 1.

[0021] In the far-field irradiation test, the distance between the radiating antenna 3 and the slit on the metal cavity 4 is the first distance.

[0022] When conducting equivalent irradiation tests, if near-field irradiation tests are used, refer to... Figure 2 As shown, the distance between the radiating antenna 3 and the slit on the metal cavity 4 is shortened, and this distance is used as the second distance.

[0023] The first distance is greater than the second distance.

[0024] For example, during a far-field irradiation test, the distance between the radiating antenna and the opening in the metal cavity is approximately 2m. Correspondingly, during an equivalent irradiation test using a near-field irradiation test, the distance between the radiating antenna and the opening in the metal cavity is 0.5m.

[0025] It should be noted that, regardless of whether it is a far-field irradiation test or a near-field irradiation test, the radiating antenna is always directly facing the openings in the metal cavity.

[0026] In one possible implementation, refer to Figure 3 As shown, the system also includes an electric dipole antenna 12 during the equivalent irradiation test.

[0027] The first end of the electric dipole antenna 12 is connected to the first end of the coaxial line 2.

[0028] The second end of the electric dipole antenna 12 is disposed inside the metal cavity 4 and adjacent to the hole on the metal cavity 4. The line connecting the center of the electric dipole antenna 12 and the center of the hole on the metal cavity 4 is perpendicular to the plane where the hole is located.

[0029] Optionally, when the equivalent irradiation test uses the internal electric dipole antenna irradiation method, the electric dipole antenna is placed inside the metal cavity near the aperture, the line connecting the center of the electric dipole antenna and the center of the aperture is perpendicular to the plane where the aperture is located, and the polarization direction of the electric dipole antenna is consistent with the polarization direction of the radiating antenna under the far-field irradiation test.

[0030] For example, refer to Figure 3 As shown, the configuration of the far-field irradiation test is the same as that of the verification test of the near-field equivalent irradiation test. During the equivalent irradiation test, the electric dipole antenna 12 is placed inside the metal cavity 4, close to the side of the metal cavity 4 with holes and slots, with a spacing of about 1 cm. The polarization direction is consistent with the polarization direction of the radiating antenna 3 during the far-field irradiation test.

[0031] Figure 4 This is a flowchart illustrating the implementation of the equivalent excitation test method for coupled field distribution in a cavity with a single aperture slit, as provided in this application embodiment. The method is applied to applications such as... Figure 1-3 The equivalent excitation test system for coupled field distribution in a single-hole slit cavity shown is described in detail below: In step 101, as the input power of the radiating antenna is gradually adjusted to the first power, the target response of the monitoring probe in the test cavity under the far-field irradiation test is obtained. The test cavity is a metal cavity.

[0032] In this embodiment, a far-field irradiation experiment is conducted using a monitoring probe placed inside the test cavity, whose influence on the field distribution within the test cavity is negligible. The monitoring probe is located near a sensitive electronic device within the test cavity. Based on the testing requirements of the far-field irradiation experiment, the input power of the radiating antenna is gradually adjusted to a first power level. At the same time, the target response of the monitoring probe inside the test cavity is obtained during the far-field irradiation experiment. .

[0033] In this embodiment of the application, when gradually adjusting the input power of the radiating antenna, the input power of the radiating antenna is gradually increased from small to large until a first power is reached. As long as the target response of the monitoring probe is monitored If the input power of the radiating antenna can be accurately obtained, then the input power of the radiating antenna can be stopped.

[0034] Traditional methods may require numerous repeated experiments to accurately simulate the excitation effects under different conditions. However, the embodiments of this application, by gradually adjusting the power and comparing the response, can find the equivalent excitation conditions more quickly. For example, there is no need to conduct too many aimless power and distance combination experiments; the key parameters (power and distance) can be adjusted directly, greatly reducing the number of experiments, thereby saving experimental time and improving overall experimental efficiency.

[0035] In step 102, the distance between the radiating antenna and the slit on the test cavity is shortened, and after shortening the distance, the input power of the radiating antenna is gradually adjusted to the second power to obtain the first response of the monitoring probe in the test cavity under the equivalent irradiation test.

[0036] In this embodiment of the application, when conducting the equivalent irradiation test, the same radiating antenna as in the far-field irradiation test is used when employing the near-field irradiation method. However, it is necessary to shorten the distance between the radiating antenna and the aperture on the test cavity, and after shortening the distance, gradually adjust the input power of the radiating antenna to the second power. The response of the monitoring probe within the test cavity under equivalent irradiation test is obtained at the current time, denoted as the first response. .

[0037] In this embodiment, shortening the distance between the radiating antenna and the aperture on the test cavity can include two scenarios: The first scenario is, as referenced Figure 2 As shown, the distance between the radiating antenna and the aperture on the test cavity is shortened to a predetermined number of wavelengths, i.e., a near-field irradiation test. For example, the distance between the radiating antenna and the aperture on the test cavity is shortened to about one wavelength.

[0038] The second scenario is, as referred to Figure 3As shown, the radiating antenna is replaced with an electric dipole antenna, and the electric dipole antenna is adjusted to be placed in a preset position inside the test cavity. The preset position inside the test cavity is adjacent to the hole on the test cavity, and the line connecting the center of the electric dipole antenna and the center of the hole on the test cavity is perpendicular to the plane where the hole is located. That is, the internal electric dipole antenna is used for irradiation. The electric dipole antenna is placed inside the test cavity close to the hole, and the line connecting the center of the electric dipole antenna and the center of the hole is perpendicular to the plane where the hole is located. The polarization direction of the electric dipole antenna is consistent with the polarization direction of the radiating antenna in the far-field irradiation test.

[0039] In one possible implementation, when the first case is true, after shortening the distance, gradually adjusting the input power of the radiating antenna to the second power, and obtaining the first response of the monitoring probe within the test cavity under the equivalent irradiation test, may include: By gradually adjusting the input power of the radiating antenna into the test cavity through the holes and slots to the second power, the first response of the monitoring probe in the test cavity under the equivalent irradiation test is obtained.

[0040] Optionally, when the distance between the radiating antenna and the aperture is directly shortened, and after shortening, the input power of the radiating antenna to the test cavity is gradually adjusted to a second power. At that time, obtain the first response of the monitoring probe inside the test cavity during the equivalent irradiation test. .

[0041] In one possible implementation, when it is the second case, after shortening the distance, gradually adjusting the input power of the radiating antenna to the second power, and obtaining the first response of the monitoring probe in the test cavity under the equivalent irradiation test, may include: By gradually adjusting the input power of the electric dipole antenna to the second power, the first response of the monitoring probe in the test cavity under equivalent irradiation test is obtained.

[0042] Optionally, when using an electric dipole antenna for equivalent irradiation testing, after shortening, the input power of the electric dipole antenna to the tested cavity is gradually adjusted to the second power. At that time, obtain the first response of the monitoring probe inside the test cavity during the equivalent irradiation test. .

[0043] In this embodiment of the application, the two key variables of the radiating antenna input power and the distance between the antenna and the aperture were clearly controlled during the experiment. By gradually adjusting and accurately acquiring the response, the interference of other uncertainties on the experimental results was reduced, making the experimental results more accurately reflect the influence of the studied variables (power and distance) on the single-aperture coupling excitation of the metal cavity, thus improving the scientific nature and accuracy of the experiment.

[0044] In step 103, when the first response equals the target response, the equivalent excitation test process of the test cavity is completed.

[0045] In this embodiment of the application, when the first response obtained in step 102 The target response obtained in step 101 When the values ​​are equal, the equivalent excitation test process of the test cavity is completed. At this point, the far-field irradiation test and the equivalent irradiation test achieve equivalence in the field distribution within the test cavity. Because the equivalent irradiation test has higher power utilization efficiency, under the same input power of the radiating antenna, the equivalent irradiation test can achieve a stronger radiation field environment within the test cavity, and can be used for equivalent tests of external strong field irradiation.

[0046] To verify the correctness of the embodiments of this application, typical experiments were conducted based on the execution process of the cavity single-hole slit coupling field distribution equivalent excitation test method and the structural composition of the cavity single-hole slit coupling field distribution equivalent excitation test system provided in the embodiments of this application.

[0047] First, the feasibility and accuracy of the equivalent irradiation test can be verified in two ways: a rectangular slit and a square aperture. For example, the dimensions of the metal cavity being tested can be 0.4m*0.4m*0.4m, the dimensions of the rectangular slit can be 0.2m*0.2m, and the side length of the square aperture can be 0.2m.

[0048] Then, using Figure 1 and Figure 2 The experimental system shown was used to conduct far-field irradiation experiments, such as... Figure 1 As shown, the distance between the radiating antenna 3 and the opening on the metal cavity 4 is approximately 2m; during the equivalent irradiation test (i.e., near-field irradiation test), as... Figure 2 As shown, the distance between the radiating antenna 3 and the aperture on the metal cavity 4 is approximately 0.5m. It should be noted that, regardless of whether it is a far-field irradiation test or an equivalent irradiation test, the radiating antenna 3 is always directly facing the aperture.

[0049] This application primarily verifies whether the normalized distribution within the metal cavity is consistent during far-field and equivalent irradiation. Therefore, only the position of the radiating antenna is changed during far-field and near-field irradiation tests, while the input power of the radiating antenna remains unchanged. The monitoring probe is approximately 20 cm from the lower surface of the metal cavity. One field strength test position is selected in each of the following locations within the metal cavity: the center (number 1), the front side (number 2), the rear side (number 3), the left side (number 4), and the right side (number 5). This ensures that the test field strength position remains unchanged during both far-field and equivalent irradiation.

[0050] When the radiating antenna is horizontally polarized, the field strength at different locations within the metal cavity under far-field and near-field irradiation at 500MHz is shown in Table 1. It can be seen that, under the same input power of the radiating antenna, the electric field strength within the metal cavity under near-field irradiation is significantly greater than that under far-field irradiation, and the maximum decibel error of the normalized field distribution is 0.56dB, which is consistent with the theoretical results, proving the correctness of the embodiments of this application.

[0051] Table 1 Field distribution within the far-field and near-field irradiation cavity at 500MHz

[0052] Further, the decibel error of the normalized field distribution at different frequencies was obtained as follows: Figure 5 As shown. Figure 5 It can be seen that the normalized field distribution error in the 400MHz to 700MHz frequency band is the largest at 1.2dB, and the decibel error modulus of most test points is less than 0.6dB. The reason for the above large error is that the field strength value is too small in this scenario, which makes it impossible for the field strength test probe to measure accurately. Figure 5 It can be seen that the equivalent error increases above 1.5GHz, which is consistent with the theory.

[0053] Further experiments yielded the equivalent test error under vertical polarization conditions of the radiating antenna, as follows: Figure 6 As shown. It should be noted that the test was simplified for frequencies from 400MHz to 700MHz, with three test locations for the field strength: the center, slightly to the left, and slightly to the right of the metal cavity. The test errors at different frequencies are basically consistent with the horizontal polarization. The above test results show that when the aperture size is smaller than the wavelength but comparable to it, the equivalent test accuracy of the near-field irradiation equivalent test method is very high. When the aperture size is larger than the electromagnetic wave wavelength, the equivalent error begins to increase, with a maximum error of approximately 4dB. Simultaneously, the radiation power utilization efficiency of the near-field irradiation method is significantly higher than that of the traditional far-field irradiation method. Therefore, the feasibility and accuracy of the near-field irradiation equivalent excitation test method are proven.

[0054] Based on the above experiments, the aperture size was changed to 20cm*2cm, with the long side parallel to the ground. Under these conditions, the field strength generated within the metal cavity when the radiating antenna is horizontally polarized is extremely weak, resulting in a large monitoring error. Therefore, in this case, the main test focuses on the magnitude of the equivalent error when the radiating antenna is vertically polarized. The experimental results are as follows: Figure 7 As shown in the figure, the normalized field strength error at the selected frequencies is less than 2dB, meeting the accuracy requirements. The reason for the larger error in the narrow-slit case compared to the wide-slit case is mainly that in the narrow-slit case, with the same antenna input power, the field strength value at certain locations inside the metal cavity is smaller, leading to a larger error because the monitoring probe cannot accurately measure it.

[0055] In addition, using Figure 1 and Figure 3 The experimental system shown has the same configuration for the external field irradiation test as the verification test of the near-field irradiation equivalent excitation method. During the equivalent irradiation test, the electric dipole antenna is placed inside the metal cavity, close to the side of the metal cavity with holes, with a spacing of about 1 cm. The polarization direction is consistent with the polarization direction of the radiating antenna during far-field irradiation.

[0056] Far-field irradiation tests and equivalent irradiation tests (i.e., electric dipole antenna tests) were conducted separately. Six test positions were selected on the plane of the monitoring probe within the metal cavity, approximately 20 cm and 30 cm from the aperture, one on the left, one in the center, and one on the right, for a total of six test positions. The test results are as follows: Figure 8 As shown, except for the 400MHz test where the error at a few locations reached 3-4dB, the errors at other locations were all controlled within 1dB. The reason for the larger error at some test points at 400MHz was mainly due to the smaller field strength value at the test point in the corresponding test scenario, making accurate measurement impossible and leading to increased test error. The above experimental results demonstrate the feasibility and accuracy of the equivalent irradiation test of the electric dipole inside the metal cavity.

[0057] This application provides an equivalent excitation test method for the coupled field distribution of a cavity with a single aperture. The method involves gradually adjusting the input power of a radiating antenna to a first power to obtain the target response of a monitoring probe within the tested cavity under far-field irradiation. The tested cavity is a metal cavity. The distance between the radiating antenna and the aperture on the tested cavity is shortened. After shortening the distance, the input power of the radiating antenna is gradually adjusted to a second power to obtain the first response of the monitoring probe within the tested cavity under equivalent irradiation. When the first response equals the target response, the equivalent excitation test process of the tested cavity is completed. This application, by gradually adjusting the power and comparing the responses, can more quickly find the equivalent excitation conditions, greatly reducing the number of experiments, saving experimental time, and improving overall experimental efficiency. Furthermore, by explicitly stating that the experiment ends when the first response equals the target response, a clear termination condition is provided, avoiding over- or under-testing that may occur in traditional methods due to a lack of clear judgment criteria. This allows the experiment to achieve the expected goals efficiently and accurately. Simultaneously, during the experiment, the two key variables—the input power of the radiating antenna and the distance between the antenna and the aperture—are clearly controlled. By gradually adjusting and precisely acquiring the response, the interference of other uncertainties on the experimental results is reduced, making the experimental results more accurately reflect the influence of the studied variables (power and distance) on the single-aperture coupling excitation of the metal cavity, thus improving the scientific rigor and accuracy of the experiment.

[0058] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0059] The following are device embodiments of this application. For details not described in detail, please refer to the corresponding method embodiments described above.

[0060] Figure 9 A schematic diagram of the exoskeleton device control optimization device provided in an embodiment of this application is shown. For ease of explanation, only the parts related to the embodiment of this application are shown, and are described in detail below: like Figure 9 As shown, the exoskeleton device control optimization device 9 includes: The target response determination module 91 is used to obtain the target response of the monitoring probe in the test cavity under far-field irradiation test when the input power of the radiating antenna is gradually adjusted to the first power. The test cavity is a metal cavity. The first response determination module 92 is used to shorten the distance between the radiating antenna and the hole on the test cavity, and after shortening the distance, gradually adjust the input power of the radiating antenna to the second power to obtain the first response of the monitoring probe in the test cavity under the equivalent irradiation test. The test completion module 93 is used to complete the equivalent excitation test process of the test cavity when the first response equals the target response.

[0061] This application provides an equivalent excitation test device for the coupled field distribution of a cavity with a single aperture. By gradually adjusting the input power of the radiating antenna to a first power, the target response of the monitoring probe inside the test cavity under far-field irradiation test is obtained. The test cavity is a metal cavity. The distance between the radiating antenna and the aperture on the test cavity is shortened, and after shortening the distance, the input power of the radiating antenna is gradually adjusted to a second power to obtain the first response of the monitoring probe inside the test cavity under equivalent irradiation test. When the first response equals the target response, the equivalent excitation test process of the test cavity is completed. This application, by gradually adjusting the power and comparing the responses, can more quickly find the equivalent excitation conditions, greatly reducing the number of experiments, saving experimental time, and improving overall experimental efficiency. Furthermore, by explicitly stating that the experiment ends when the first response equals the target response, a clear termination condition is provided, avoiding over- or under-testing that may occur in traditional methods due to a lack of clear judgment criteria. This allows the experiment to achieve the expected goals efficiently and accurately. Simultaneously, during the experiment, the two key variables—the input power of the radiating antenna and the distance between the antenna and the aperture—are clearly controlled. By gradually adjusting and precisely acquiring the response, the interference of other uncertainties on the experimental results is reduced, making the experimental results more accurately reflect the influence of the studied variables (power and distance) on the single-aperture coupling excitation of the metal cavity, thus improving the scientific rigor and accuracy of the experiment.

[0062] In one possible implementation, the first response determination module can be used to: Shorten the distance between the radiating antenna and the slits on the test cavity to a preset number of wavelengths.

[0063] In one possible implementation, the first response determination module can specifically be used for: By gradually adjusting the input power of the radiating antenna into the test cavity through the holes and slots to the second power, the first response of the monitoring probe in the test cavity under the equivalent irradiation test is obtained.

[0064] In one possible implementation, the first response determination module can also be used for: Replace the radiating antenna with an electric dipole antenna and adjust the electric dipole antenna to a preset position inside the test cavity. The preset position inside the test cavity is adjacent to the hole on the test cavity, and the line connecting the center of the electric dipole antenna and the center of the hole on the test cavity is perpendicular to the plane where the hole is located.

[0065] In one possible implementation, the first response determination module can also be used for: By gradually adjusting the input power of the electric dipole antenna to the second power, the first response of the monitoring probe in the test cavity under equivalent irradiation test is obtained.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0067] Those skilled in the art will recognize that the templates, units, and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0068] If the module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above embodiments of the equivalent excitation test method for single-hole slit coupling field distribution in various cavities. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory, a random access memory, an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A cavity single-aperture seam-coupled field distribution equivalent excitation test method, characterized in that, The method comprises the following steps: obtaining a target response of a monitoring probe in a test cavity under far-field irradiation test when gradually adjusting input power of a radiation antenna to a first power, wherein the test cavity is a metal cavity; shortening a distance between the radiation antenna and an aperture on the test cavity, and obtaining a first response of the monitoring probe in the test cavity under equivalent irradiation test when gradually adjusting input power of the radiation antenna to a second power after shortening the distance; completing equivalent excitation test process of the test cavity when the first response is equal to the target response.

2. The cavity single-aperture SEF method of claim 1, wherein, The step of shortening the distance between the radiation antenna and the aperture on the test cavity comprises: shortening the distance between the radiation antenna and the aperture on the test cavity to a preset number of wavelengths.

3. The cavity single-aperture SEF method of claim 2, wherein, The step of obtaining the first response of the monitoring probe in the test cavity under the equivalent irradiation test when gradually adjusting input power of the radiation antenna to the second power after shortening the distance comprises: obtaining the first response of the monitoring probe in the test cavity under the equivalent irradiation test when gradually adjusting input power of the radiation antenna to the second power through the aperture on the test cavity.

4. The cavity single-aperture SEF method of claim 1, wherein, The step of shortening the distance between the radiation antenna and the aperture on the test cavity comprises: replacing the radiation antenna with an electric dipole antenna, and adjusting the electric dipole antenna to be placed at a preset internal position of the test cavity, wherein the preset internal position is adjacent to the aperture on the test cavity, and a line connecting a center of the electric dipole antenna and a center of the aperture on the test cavity is perpendicular to a plane on which the aperture is located.

5. The cavity single-aperture SLCF distribution equivalent excitation test method according to claim 4, characterized in that, The step of obtaining the first response of the monitoring probe in the test cavity under the equivalent irradiation test when gradually adjusting input power of the radiation antenna to the second power after shortening the distance comprises: obtaining the first response of the monitoring probe in the test cavity under the equivalent irradiation test when gradually adjusting input power of the electric dipole antenna to the second power.

6. A cavity single-aperture leaky-wave field distribution equivalent excitation test device, characterized in that, The method comprises the following steps: obtaining a target response of a monitoring probe in a test cavity under far-field irradiation test when gradually adjusting input power of a radiation antenna to a first power, wherein the test cavity is a metal cavity; obtaining a first response of the monitoring probe in the test cavity under equivalent irradiation test when gradually adjusting input power of the radiation antenna to a second power after shortening a distance between the radiation antenna and an aperture on the test cavity; completing equivalent excitation test process of the test cavity when the first response is equal to the target response.

7. A cavity single-aperture, leaky-mode, field-pattern equivalent excitation test system, characterized by, The system comprises: an anechoic chamber, a coaxial line, a radiation antenna, a metal cavity, a monitoring probe, an optical fiber, a directional coupler, a power amplifier, a signal generator, a power meter and a computer; the coaxial line, the radiation antenna, the metal cavity, the monitoring probe and the optical fiber are arranged in the anechoic chamber; The first end of the coaxial line is connected with the radiation antenna, and the second end of the coaxial line is connected with the first end of the directional coupler arranged outside the anechoic chamber; The second end of the directional coupler is connected with the power meter, and the third end of the directional coupler is connected with the output end of the power amplifier; The output end of the signal generator is connected with the input end of the power amplifier; The optical fiber is used for connecting the monitoring probe arranged in the anechoic chamber with the computer arranged outside the anechoic chamber.

8. The cavity single-aperture, leaky-wave field distribution equivalent excitation test system of claim 7, wherein, When the far field irradiation test is performed, the distance between the radiation antenna and the aperture on the metal cavity is a first distance; When the equivalent irradiation test is performed, the distance between the radiation antenna and the aperture on the metal cavity is a second distance; The first distance is greater than the second distance.

9. The cavity single-aperture SLCF distribution equivalent excitation test system according to claim 7, wherein, When the equivalent irradiation test is performed, the system further comprises an electric dipole antenna; The first end of the electric dipole antenna is connected with the first end of the coaxial line; The second end of the electric dipole antenna is arranged inside the metal cavity and adjacent to the aperture on the metal cavity, and the line connecting the center of the electric dipole antenna with the center of the aperture on the metal cavity is perpendicular to the plane on which the aperture is located.

10. The cavity single-aperture, leaky-wave field distribution equivalent excitation test system of claim 9, wherein, The polarization direction of the electric dipole antenna is consistent with the polarization direction of the radiation antenna under the far field irradiation test.

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