CN117375736B - Differential mode injection test method and system for electromagnetic compatibility sensitivity test - Google Patents
Differential mode injection test method and system for electromagnetic compatibility sensitivity test Download PDFInfo
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- H04B17/00—Monitoring; Testing
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- H04B17/0085—Monitoring; Testing using service channels; using auxiliary channels using test signal generators
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Abstract
The invention relates to the technical field of electromagnetic compatibility sensitivity test, and discloses a differential mode injection test method and a system for electromagnetic compatibility sensitivity test,the method comprises at least performing power scanning at the same frequency to measure multiple groups of low irradiation field intensity components E 1 And obtaining multiple groups of calibration injection voltages V according to the monitored power components 1 The method comprises the steps of carrying out a first treatment on the surface of the By monitoring the power component U 1 Obtaining a plurality of low irradiation field intensity components E 1 Multiple groups of measured calibration injection voltages V 1 And a low irradiation field strength component E 1 Calculating a plurality of K values, and obtaining an average value of the K values; to calculate the equivalent injection voltage V 2 And to make the target field intensity E 2 Is V 2 The method comprises the steps of carrying out a first treatment on the surface of the Adjusting the power of the signal source to make the voltage of the injection port be the calculated equivalent injection voltage V 2 Performing injection test; the test system is based on the test method. The test method and the system enable electromagnetic compatibility sensitivity test results and injection voltage to simulate radiation sensitivity characteristics more truly.
Description
Technical Field
The invention relates to the technical field of electromagnetic compatibility sensitivity test of radio communication, in particular to a differential mode injection test method and a differential mode injection test system for electromagnetic compatibility sensitivity test.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With intentional and unintentional electromagnetic radiation, high field intensity radiation sensitivity is also of increasing interest, especially for military warplanes, ships and civilian vehicles, airliners, etc., where high field intensity radiation sensitivity testing is required during the development stage. However, the radiation field intensity which can be simulated in the laboratory at present is limited by various types, including high cost of a high-power microwave source, low field intensity of low frequency and the like, and the radiation field intensity is more difficult to realize by simulation for the requirement of tens of thousands of volts of meters of high field intensity.
The nature of high field strength radiated interference is that interference currents are generated in the tested equipment, thereby affecting the normal operation of the tested equipment. Based on the above considerations, the high power radiation sensitivity test can be converted into a current conduction sensitivity test. The existing mature differential mode injection test method adopts an asymmetric directional coupler to perform voltage injection, and the main path signal and the auxiliary path signal of the coupler have 180-degree phase relation, so that the auxiliary path signal is only the main path signal which is inverted in the time domain, the waveform characteristics of the auxiliary path signal are not changed, and the main path signal monitoring can be realized through the auxiliary path.
And (3) aiming at an interconnection system, an antenna feed system and the like, checking electromagnetic sensitivity of equipment connected with two sections of cables. In the experimental test process, the existing differential film injection method is used for testing, and the steps are found to be slightly complicated and the injection voltage difference is large under different conditions according to the test steps in GJB 8848-2016.
The existing differential film injection method has the technical problems that: when using the differential film injection method, the field strength E is known by low irradiation in the linear region of the test system response 01 Obtaining the regulated injection voltage V 01 Using k=e 01 /V 01 Obtaining a transfer function K by using K and a predetermined target radiation field intensity E 02 Obtaining the adjusted equivalent injection voltage V of the target field intensity 02 。
In a specific test process, the adjustment is complicated: first, the existing test is to test the low irradiation field intensity E 01 As a known quantity, the power output of the power amplifier is required to be continuously regulated so that the field intensity of the receiving antenna reaches the low irradiation field intensity E 01 Adjusting injection voltage V based on the monitored power component and based on the monitored power component acquisition 01 Thus, the transfer function K is obtained, and the adjustment needs to be continuously tested, slowly approaches, and needs longer time. Secondly, the equivalent injection voltage V is regulated when the target field intensity is obtained 02 When the method is used, the power output of the power amplifier is continuously debugged, and further, the power output is obtained, and the debugging time is longer. In addition, the injection voltage of the test method is large in difference under different conditions, and the measurement accuracy is not very accurate.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the differential mode injection test method for electromagnetic compatibility sensitivity test, which optimizes the existing differential mode injection method, improves the test efficiency through amplitude scanning, eliminates the random error of the system by using statistical average, ensures that the test result is more accurate, ensures that the injection voltage is more accurate and can simulate the radiation sensitivity characteristic more truly.
The technical scheme adopted by the invention is as follows: a differential mode injection test method for electromagnetic compatibility sensitivity test at least comprises the following steps:
power scanning is carried out under the same frequency to measure a plurality of groups of low-irradiation field intensity components E 1 And obtaining multiple groups of calibration injection voltages V according to the monitored power components 1 The method comprises the steps of carrying out a first treatment on the surface of the And
by monitoring the power component U 1 Obtaining a plurality of low-irradiation field intensity components E 1 Multiple groups of measured calibration injection voltages V 1 And a low irradiation field strength component E 1 Substituting formula (1) to calculate a plurality of K values, and to obtain an average value of the plurality of K valuesThe method comprises the steps of carrying out a first treatment on the surface of the And
average value of KSubstituting the field strength E into the formula (2) to calculate the target field strength E 2 Is equivalent to the injection voltage V 2 ；
Wherein:
（1）；
(2) The method comprises the steps of carrying out a first treatment on the surface of the And
adjusting the power of the signal source to make the injection port voltage be the calculated equivalent injection voltage V 2 And performing injection test on the tested equipment.
In the present technical solution, the average value of K is calculated using formula (3)
（3）
Wherein: n is the number of test power scans, E i And V i The i-th single test value of the low irradiation field strength component and the calibration injection voltage, respectively.
In the technical scheme, the tested equipment of the differential mode injection testing method is placed in a testing system in a anechoic chamber, and the testing system is ensured to be in a linear response area.
In the technical scheme, when the power scanning is carried out under the same frequency, different low-irradiation field intensity components E are obtained through a spectrometer 1 Is a monitoring power component U 1 Maintaining the signal source at a fixed frequency, and continuously adjusting the output power of the signal source by the signal source so as to test and record multiple groups of low-irradiation field intensity components E 1 And monitoring the power component U 1 。
In the technical scheme, during injection voltage test, the output end of the power amplifier is connected to the injection port of the asymmetric directional coupler, and the signal source injection power value is regulated to ensure that the monitoring power of the spectrometer is equal to the monitoring power component U 1 Record the calibration injection voltage V 1 By monitoring the power components U by multiple groups 1 Obtaining multiple groups of calibration injection voltages V 1 Obtaining。
In the present technical solution, when determining the target field strength E 2 Is equal to the equivalent injection voltage ofWhen the signal source power is regulated, the injection port voltage is equal to the equivalent injection voltage V 2 And then performing injection voltage test on the tested equipment.
A differential mode injection test system for electromagnetic compatibility sensitivity test, which is performed by using the differential mode injection test method, the differential mode injection test system comprising:
the transmitting terminal comprises a signal source, a power amplifier and a transmitting antenna which are sequentially connected, wherein the signal source is used for providing a low-power signal, and the power amplifier amplifies the low-power signal and radiates the low-power signal through the transmitting antenna; the receiving end comprises a receiving antenna, an attenuator and a power meter which are connected in sequence, wherein the receiving antenna is positioned in the area where the tested equipment is positioned, receives power and is connected to the power meter through the attenuator; the tested device is also connected with a frequency spectrograph and a first load and/or a second load and/or a third load; the tested equipment is provided with a conduction connection, an asymmetric directional coupler is connected at the conduction connection, the asymmetric directional coupler is used for realizing current injection and monitoring injection voltage, and the spectrometer is used for measuring the injection voltage.
In the technical scheme, the transmitting antenna is replaced by a field intensity probe.
Compared with the prior art, the invention has the beneficial effects that:
1. the transmitting power of the power amplifier is used as a known quantity, the process of continuously adjusting the output value of the power amplifier is avoided, the testing efficiency is improved, and the low irradiation field intensity component E is obtained in the test 1 Obtaining the monitored power component U 1 Obtaining a calibration injection voltage V in an injection test link 1 。
2. And the K is subjected to multiple result equalization processing, so that inaccuracy caused by the fact that the value of the K value is changed in each test process is solved, and errors caused by the randomness of the system are reduced. Since the K value fluctuates on the one hand to monitor the power component U 1 And calibrating injection voltage V 1 Certain tolerance exists in the measuring process, accurate test is difficult to achieve, and on the other hand, the tolerance is caused by random errors of a system and is difficult to directly avoid.
3. By means of low-irradiance field intensity component E 1 And its calibration injection voltage V 1 Obtaining a transfer function K=E 1 /V 1 Secondly, the target field intensity E is utilized 2 And a transfer function K, obtaining an equivalent injection voltage V 2 =E 2 *V 1 /E 1 It should be clear that K is a function of frequency, i.e. the same K value of frequency is unchanged, thereby improving the overall detection efficiency。
In summary, the differential mode injection test method for electromagnetic compatibility sensitivity test improves the test efficiency by amplitude scanning, eliminates the random error of the system by using statistical average, and leads the test result to be more accurate, thereby improving the efficiency and quality of electromagnetic compatibility sensitivity test.
Drawings
FIG. 1 is a flow chart of a differential mode injection test method;
FIG. 2 shows a low irradiance field strength component E according to an embodiment of the invention 1 Testing and monitoring power component U 1 A schematic diagram of a connection structure of a test time difference mode injection test system;
FIG. 3 shows a calibration injection voltage V according to an embodiment of the present invention 1 Schematic diagram of connection structure of time difference mode injection test system.
Wherein: 1-signal source, 2-power amplifier, 3-transmitting antenna, 4-receiving antenna, 5-attenuator, 6-power meter, 7-tested equipment, 8-load one, 9-spectrometer, 10-load two, 11-load three, 12-asymmetric directional coupler.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the indicated combinations or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, in the description process of the embodiment of the present invention, the positional relationships of the devices such as "upper", "lower", "front", "rear", "left" and "right" in all the figures are all standardized in fig. 2.
According to the existing differential mode injection test method for electromagnetic compatibility sensitivity test, the response of a test system is in a linear region, and the known low irradiation field intensity E is adopted 01 Obtaining the regulated injection voltage V 01 According to the formula k=e 01 /V 01 Obtaining a transfer function K from K and a predetermined target radiation field intensity E 02 Obtaining the adjusted equivalent injection voltage V of the target field intensity 02 ，V 02 =E 02 /K=E 02 *V 01 /E 01 . K is a function of frequency, and the same frequency K should have the same value. The existing test will have low irradiation field strength E 01 As a known quantity, the power output of the power amplifier is required to be continuously regulated so that the field intensity of the receiving antenna reaches the low irradiation field intensity E 01 Simultaneously acquiring monitoring power U 01 According to the monitoring power U 01 Obtaining the regulated injection voltage V 01 Thereby obtaining a transfer function K according to the low irradiation field intensity component E 1 Adjusting the power amplifier output is a fairly time consuming process and the test time is overall longer.
In order to solve the above problems, as shown in fig. 1, a differential mode injection test method for electromagnetic compatibility sensitivity test is provided, which at least comprises the following steps:
s1, performing power scanning under the same frequency to measure a plurality of groups of low-irradiation field intensity components E 1 And obtaining multiple groups of calibration injection voltages V according to the monitored power components 1 ；
S2 by monitoring the power component U 1 Obtaining a plurality of low-irradiation field intensity components E 1 Multiple groups of measured calibration injection voltages V 1 And a low irradiation field strength component E 1 Substituting formula (1) to calculate a plurality of K values, and S3 is performed to obtain an average value of a plurality of K；
And S4 willSubstituting the field strength E into the formula (2) to calculate the target field strength E 2 Equivalent injection of (a)Voltage V 2 ；
Wherein:
（1）；
（2）；
s5, adjusting the power of the signal source to enable the voltage of the injection port to be the equivalent injection voltage V obtained through calculation 2 And performing injection test on the tested equipment.
In at least some embodiments, the average calculation of K is calculated using equation (3)
（3）
Wherein: n is the number of test power scans, E i And V i The i-th single test value of the low irradiation field strength component and the calibration injection voltage, respectively.
The differential mode injection test method of the invention takes the output of the power amplifier as known, and when the connection structure diagram of the differential mode injection test system is shown in figure 2, the power scanning is carried out under the same frequency to measure a plurality of groups of low irradiation field intensity components E 1 And monitoring the power component U 1 When the connection structure of the differential mode injection test system is shown in FIG. 3, the power component U is monitored 1 Obtaining a plurality of calibration injection voltages V 1 The continuous regulation process of the output value of the power amplifier is avoided, the test efficiency is improved, and then when the connection structure diagram of the differential mode injection test system is shown as figure 2, the low irradiation field intensity component E is obtained by test 1 And monitoring the power component U 1 Obtaining a calibration injection voltage V in an injection test link 1 . The power scanning improves the testing efficiency, and the injection voltage V is calibrated by a plurality of groups 1 And a low irradiation field strength component E 1 That is, a plurality of K values can be obtained at one frequency, the K values are statistically averaged, the test error is eliminated, and the final average value is usedCan obtain more accurate injection voltage。
In at least some embodiments, the device under test 7 of the differential mode injection test method is performed by a test system placed in a anechoic chamber and the test system is guaranteed to be in a linear response area to improve the effectiveness and accuracy of the test.
In at least some embodiments, the different low-irradiance field strength components E are obtained by the spectrometer 9 while performing the power sweep at the same frequency 1 Is a monitoring power component U 1 Keeping the signal source 1 at a certain fixed frequency, the signal source 1 continuously adjusts the output power of the signal source 1 so as to test and record multiple groups of field intensity low-irradiation field intensity components E 1 And monitoring the power component U 1 。
In at least some embodiments, as shown in fig. 3, the output of the power amplifier 2 is connected to the injection port of the asymmetrical directional coupler 12 during injection voltage testing, and the signal source 1 injection power value is adjusted so that the monitored power of the spectrometer 9 is equal to the monitored power component U 1 Record the calibration injection voltage V 1 By monitoring the power components U by multiple groups 1 Obtaining multiple groups of calibration injection voltages V 1 Further, calculate the average value of K。
In at least some embodiments, when determining the target field strength E 2 Is equal to the equivalent injection voltage ofWhen the power of the signal source 1 is regulated, the injection port voltage is equal to the equivalent injection voltage V 2 And then, performing injection voltage test on the tested equipment 7, thereby realizing accurate test on electromagnetic compatibility of the tested equipment.
In at least some embodiments, as shown in fig. 2 and 3, a differential mode injection test system for electromagnetic compatibility sensitivity testing, the differential mode injection test system comprising:
the transmitting terminal is shown in the left side position and comprises a signal source 1, a power amplifier 2 and a transmitting antenna 3 which are sequentially connected, wherein the signal source 1 is used for providing a low-power signal, the signal source 1 is used for setting a test frequency and a low-power signal in a specific test, and the power amplifier 2 amplifies the low-power signal and radiates the low-power signal through the transmitting antenna 3;
the receiving end comprises a receiving antenna 4, an attenuator 5 and a power meter 6 which are connected in sequence, wherein the receiving antenna 4 is positioned in the area where the tested equipment 7 is positioned, and the receiving antenna 4 receives power and is connected to the power meter 6 through the attenuator 5; the tested device 7 is also connected with the frequency spectrograph 9 and the first load 8 and/or the second load 10 and/or the third load 11, and in the implementation process, the first load 8, the second load 10 and the third load 11 can be connected with the tested device 7 as required without all connection; the test devices 7 are connected in a conducting way, and an asymmetric directional coupler 12 is connected at the conducting way, the asymmetric directional coupler 12 is used for realizing current injection and monitoring injection voltage, and the spectrometer 9 is used for measuring the injection voltage. The differential mode injection test system is matched with the differential mode injection test method, so that the electromagnetic compatibility sensitivity can be tested efficiently and rapidly, the test result is more accurate, and the efficiency and quality of the electromagnetic compatibility sensitivity test are improved.
In at least some embodiments, the receiving antenna 4 uses a field strength probe instead of it to achieve a test field strength value for better testing.
In the following description of a specific test method, the present example realizes full-automatic test by computer software, and selects several frequencies and powers, and power values are selected to be-15 dBm and-20 dBm, so that more power can be actually tested to optimize the K value precision.
The test contents to be performed are as follows: test frequencies 2.2GHz, 2.4GHz, 2.6GHz, 2.8GHz, 3.0GHz and 3.2GHz; the power of the signal source is-15 dBm and-20 dBm.
1) According to FIG. 2 differential mode injectionConnecting structure diagram of in-test system, setting frequency to 2.2GHz, switching signal source power to-15 dBm and-20 dBm in turn, and testing low irradiation field intensity component E twice 1 And monitoring the power component U 1 。
2) Sequentially completing low irradiation field intensity components E of other frequencies according to the step 1) 1 And monitoring the power component U 1 Testing, test data are shown in tables 1 and 2;
3) According to the frequencies and monitoring power components U shown in tables 1 and 2 1 Injection test is performed according to the device connection diagram of fig. 3, and the output power of the signal source is adjusted to enable the monitoring power of the spectrometer to reach the monitoring power component U 1 Recording the injection port voltage as the calibration injection voltage V 1 The different frequencies and signal source power tests were completed, complementing tables 1 and 2.
4) Using k=e 1 /V 1 Calculating the K value of the transfer function of all frequency points as shown in table 3;
5) As shown in Table 4, it can be seen from Table 4 that there is a certain test error in the K value at the same frequency, the error at 2.8GHz is up to-6.78%, and the error mainly comes from the monitored power component U of the small signal 1 And (5) a systematic random error.
6) The average value of K is obtained according to the following formulaN is the test power quantity, E i And V i Is a single test value.
Determination of the mean value of K by multiple testsAccording to the target field strength E 2 Can calculate the equivalent injection voltageVoltage injection measurement by means of fig. 3And (5) testing.
TABLE 1 Signal Source output-15 dBm
TABLE 2 Signal Source output-20 dBm
Table 3 data processing analysis
Table 4K value treatment
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present invention, however, the present invention is not limited thereto, for low irradiance field strength component E 1 The invention adopts an antenna to obtain, and can also test the field intensity value through a field intensity probe. The test example selects two power values, and more power values can be selected to improve K-value accuracy.
In summary, the test of the present invention is performed in two steps, first using a low irradiation field strength component E 1 And its calibration injection voltage V 1 Obtaining a transfer function K=E 1 /V 1 Secondly, the target field intensity E is utilized 2 And a transfer function K, obtaining a target field intensity E 2 Is equivalent to the injection voltage V 2 =E 2 *V 1 /E 1 It is clear that K is a function of frequency, i.e. the same K value is unchanged.
From the concrete implementation example of the invention, 6 frequency points are selected, the power samples of the signal source are respectively-15 dBm and-20 dBm, and the K value test is carried out under the conditions. Firstly, the testing efficiency is improved through power scanning, when two power samples are selected, at least 30% of time can be saved according to actual measurement, and the higher the number of the power samples is, the higher the high efficiency of the method can be embodied; and secondly, the test precision is improved, taking a test K value of 2.8GHz as an example, the deviation of the test results of two times is 6.78%, the test precision can be improved by 3.89% through averaging, and the test precision can be further optimized by properly increasing the number of power samples.
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various extensions and modifications can be made without departing from the spirit of the present invention.
Claims (7)
1. The differential mode injection test method for electromagnetic compatibility sensitivity test is characterized by at least comprising the following steps:
power scanning is carried out under the same frequency to measure a plurality of groups of low-irradiation field intensity components E 1 And obtaining multiple groups of calibration injection voltages V according to the monitored power components 1 The method comprises the steps of carrying out a first treatment on the surface of the And
by monitoring the power component U 1 Obtaining a plurality of low-irradiation field intensity components E 1 Multiple groups of measured calibration injection voltages V 1 And a low irradiation field strength component E 1 Substituting formula (1) to calculate a plurality of K values, and averaging the obtained K values to obtain an average value of KThe method comprises the steps of carrying out a first treatment on the surface of the And
will beSubstituting the field strength E into the formula (2) to calculate the target field strength E 2 Is equivalent to the injection voltage V 2 ；
Wherein:
（1）；
(2) The method comprises the steps of carrying out a first treatment on the surface of the And
adjusting the power of the signal source to make the injection port voltage be the calculated equivalent injection voltage V 2 Performing injection test on the tested equipment;
the average value of K is calculated using equation (3)
（3）
Wherein: n is the number of test power scans, E i And V i The i-th single test value of the low irradiation field strength component and the calibration injection voltage, respectively.
2. A differential mode injection test method for electromagnetic compatibility sensitivity testing according to claim 1, characterized in that the device under test (7) of the differential mode injection test method is performed by a test system placed in an anechoic chamber and ensures that the test system is in a linear response zone.
3. The differential mode injection test method for electromagnetic compatibility sensitivity test of claim 2, wherein:
when the power scanning is carried out under the same frequency, different low irradiation field intensity components E are obtained through a frequency spectrograph (9) 1 Is a monitoring power component U 1 Keeping the signal source (1) at a certain fixed frequency, the signal source (1) continuously adjusts the output power of the signal source (1) for testing and recording multiple groups of low-irradiation field intensity components E 1 And monitoring the power component U 1 。
4. A differential mode injection test method for electromagnetic compatibility sensitivity test according to claim 3, characterized in that, during injection voltage test, the output end of the power amplifier (2) for test is connected to the injection port of the asymmetric directional coupler (12), and the injection power value of the signal source (1) is adjusted to make the frequencyThe monitoring power of the spectrometer (9) is equal to the monitoring power component U 1 Record the calibration injection voltage V 1 。
5. The differential mode injection test method for electromagnetic compatibility sensitivity test of claim 4,
when determining the target field strength E 2 Is equal to the equivalent injection voltage ofWhen in use, the power of the signal source (1) is firstly regulated to lead the voltage of the injection port to be equivalent to the injection voltage V 2 And then performing injection voltage test on the tested equipment (7).
6. A differential mode injection test system for electromagnetic compatibility sensitivity test, characterized in that the differential mode injection test method according to any one of claims 1 to 5 is used for the test, the differential mode injection test system comprising:
the transmitting terminal comprises a signal source (1), a power amplifier (2) and a transmitting antenna (3) which are sequentially connected, wherein the signal source (1) is used for providing a low-power signal, and the power amplifier (2) amplifies the low-power signal and radiates the low-power signal through the transmitting antenna (3); and
the receiving end comprises a receiving antenna (4), an attenuator (5) and a power meter (6) which are connected in sequence, wherein the receiving antenna (4) is positioned in an area where tested equipment (7) is positioned, and the receiving antenna (4) receives power and is connected to the power meter (6) through the attenuator (5); the tested device (7) is also connected with a frequency spectrograph (9) and a load one (8) and/or a load two (10) and/or a load three (11); the test devices (7) are connected in a conductive manner, and an asymmetric directional coupler (12) can be connected to the conductive connection, the asymmetric directional coupler (12) is used for realizing current injection and monitoring injection voltage, and the spectrometer (9) is used for measuring injection voltage.
7. A differential mode injection test system for electromagnetic compatibility sensitivity testing according to claim 6, characterized in that the transmitting antenna (3) is replaced with a field strength probe.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128990A (en) * | 2011-01-24 | 2011-07-20 | 北京航空航天大学 | Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test |
| CN112733329A (en) * | 2020-12-22 | 2021-04-30 | 浙江大学 | Hierarchical positioning method for uniform region of reverberation room field |
| CN113009254A (en) * | 2021-02-24 | 2021-06-22 | 中国人民解放军陆军工程大学 | High-power high-linearity current injection probe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102128990A (en) * | 2011-01-24 | 2011-07-20 | 北京航空航天大学 | Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test |
| CN112733329A (en) * | 2020-12-22 | 2021-04-30 | 浙江大学 | Hierarchical positioning method for uniform region of reverberation room field |
| CN113009254A (en) * | 2021-02-24 | 2021-06-22 | 中国人民解放军陆军工程大学 | High-power high-linearity current injection probe |
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