Method and system for measuring electric field before radiation sensitivity test

Abstract

The invention provides a method and system for measuring an electric field before a radiation sensitivity test, and the method comprises the steps: enabling a signal generator to output a low-level signal with a test specified frequency according to a selected modulation mode when there is no tested system; the array power amplifier amplifies the generated low-level signal, outputs a high-power array signal and outputs the high-power array signal to the array transmitting antenna so as to apply a calibration electric field; measuring the applied calibration electric field through a field intensity monitoring suite to obtain a measured field intensity value; if the measured field intensity value does not reach the preset test field intensity value, adjusting the amplitude of a low-level signal output by a signal generator until the measured field intensity value reaches the preset test field intensity value; if the output power of each channel of the array power amplifier is not abnormal, calculating the output total power of the array power amplifier based on the output power of each channel of the array power amplifier, and taking the output total power as calibration reference power before the test; according to the method, the amplitude field intensity error generated by the array power amplifier is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of radiation sensitivity measurement, and in particular relates to a method and system for measuring electric field before a radiation sensitivity test. Background Art

[0002] At present, the radiation power of external radiation sources is increasing day by day, which poses a serious threat to the normal operation of electronic information systems. In a strong electromagnetic environment, if no countermeasures are taken, it will lead to system perception confusion, command and coordination disorder, and reduced efficiency. In addition, standards such as GJB1389 series and GJB8848-2016 require that electronic information systems should be compatible with the specified external radio frequency electromagnetic environment so that the system's working performance meets the requirements.

[0003] The existing electric field measurement before the radiation sensitivity test mainly applies the electric field in the test field and measures it in the absence of the test system to establish an electric field environment with a specified field strength value. For the traditional single-channel power amplifier test configuration, the actual output power of the single-channel power amplifier can be measured by using a directional coupler and a power meter, and the actual transmission power that produces the field strength is recorded. Then, during the radiation sensitivity test, the actual output power of the power amplifier is adjusted to the recorded actual output power value. For the high field strength test requirements of the GJB1389 series and GJB8848-2016 standards, the required power amplifier power needs to be increased by 2 to 4 orders of magnitude from the 200V / m of the RS103 standard of GJB151B to thousands of V / m to tens of thousands of V / m. Therefore, array-type power amplifiers (i.e., array power amplifiers) are often used at this stage. Compared with the traditional single-channel power synthesis form, they have the following advantages: the efficiency of array spatial power synthesis is better than that of multi-stage synthesis to single-channel power synthesis, which can greatly reduce the cost of power amplifiers; reduce the power of a single channel, improve the reliability of microwave devices, and avoid problems such as thermal burnout or high-power breakdown; array antennas are smaller in size than single antennas, which facilitates the integration of test systems. However, for array-type power amplifiers, since the number of channels may be as many as dozens to hundreds, the existing pre-test electric field measurement scheme has the following problems:

[0004] 1. It is difficult to accurately evaluate the total output power of the array amplifier, because the output power of a certain channel is used as the calibration reference for the total output power of the array, and the test errors caused by temperature, mutual coupling of array units or inconsistent amplitudes of each channel when the power is adjusted significantly cannot be taken into account;

[0005] 2. It is difficult to evaluate the changes in the measured field strength caused by changes in the total array output power and antenna gain due to abnormal or faulty array amplifier output power or strong reflection from the measured system (usually a metal shell);

[0006] 3. If the traditional multi-channel power meter method is used, since the communication time of the power meter is on the order of 100ms, the cost of testing the output power of the array power amplifier is high and it will greatly increase the radiation sensitivity test time.

[0007] Therefore, at this stage, there is an urgent need to develop a method and system for measuring the electric field before a radiation sensitivity test to solve one or more of the above-mentioned technical problems. Summary of the invention

[0008] In order to solve the above technical problems, the present invention proposes a technical solution of an electric field measurement method, system, electronic device and storage medium before a radiation sensitivity test to solve the above technical problems.

[0009] The first aspect of the present invention discloses a method for measuring electric field before radiation sensitivity test, the method comprising:

[0010] Step S1, determining the irradiation position of the array transmitting antenna based on the test distance and the wave number range of the array transmitting antenna, and setting the position of the array transmitting antenna in the test site according to the irradiation position;

[0011] Step S2: In the absence of a test system, the signal generator outputs a low-level signal of a test specified frequency according to the selected modulation mode;

[0012] Step S3: the array power amplifier amplifies the generated low-level signal and outputs a high-power array signal, and outputs the high-power array signal to the array transmitting antenna to apply a calibration electric field to the test site;

[0013] Step S4: measuring the applied calibration electric field by means of a field strength monitoring kit to obtain a measured field strength value of the calibration electric field;

[0014] Step S5: if the measured field strength value does not reach the preset test field strength value, adjusting the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value;

[0015] Step S6: If there is no abnormality in the output power of each channel of the array power amplifier, the total output power of the array power amplifier is calculated based on the output power of each channel of the array power amplifier, and the total output power is used as the calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

[0016] According to the method of the first aspect of the present invention, step S6 specifically comprises:

[0017] Step S61: using multiple directional couplers, oscilloscopes and array monitoring radio frequency switch units to test the actual output power of each channel, and recording the actual transmission power of each corresponding channel;

[0018] Step S62: determining whether each channel has an abnormality based on the factory test power data of the array power amplifier and the actual output power of each channel of the array power amplifier;

[0019] Step S63: If there is no abnormality in the output power of each channel of the array power amplifier, the sum of the actual output power of each channel is calculated to obtain the total output power of the array power amplifier, and the total output power is used as the calibration reference power before the test.

[0020] According to the method of the first aspect of the present invention, step S61 specifically includes:

[0021] A directional coupler is used to couple the high-power array signals output in the forward and reverse directions of each channel of the array power amplifier into low-power signals, and the signals are connected to an array monitoring RF switch unit through a corresponding RF cable;

[0022] Connecting the coupled forward and reverse output power signals to the oscilloscope through the array monitoring radio frequency switch unit;

[0023] The oscilloscope monitors the coupled forward and reverse output power signals with the selected detection type to obtain the forward and reverse actual output power of each channel of the array power amplifier, and then calculates the actual output power of each channel of the array power amplifier.

[0024] According to the method of the first aspect of the present invention, step S62 specifically includes:

[0025] A radio frequency switching synchronization signal is applied between the array monitoring radio frequency switch unit and the oscilloscope to ensure that the switching time of the array monitoring radio frequency switch unit is synchronized with the time of the coupled forward and reverse output power signals currently tested by the oscilloscope;

[0026] The actual forward or reverse output power of the current switching channel is recorded by a control computer, and compared with the factory test power data of the array power amplifier to determine whether there is an abnormality in each channel.

[0027] According to the method of the first aspect of the present invention, the actual forward or reverse output power of the current switching channel is recorded by a control computer, and compared with the factory test power data of the array power amplifier to determine whether each channel has an abnormality, specifically comprising:

[0028] Automatically comparing the recorded actual forward or reverse output power of each channel with the factory test power data of the array power amplifier by the control computer;

[0029] When the control computer determines that the absolute value of the difference between the actual forward or reverse output power of a channel and the corresponding factory test power data is less than a preset threshold, it is determined that the channel has a power output abnormality.

[0030] According to the method of the first aspect of the present invention, the determination formula adopted by the control computer is expressed as:

[0031] |P _N -P _N_cal |≤η (1)

[0032] Among them, P _N It is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB;

[0033] P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB;

[0034] η is the preset threshold value, which is given in the manufacturer's factory test report.

[0035] A second aspect of the present invention discloses a radiation sensitivity testing method, the method comprising:

[0036] The method described in any one of the first aspects of the present invention is used to obtain a calibration reference power before the test, and to complete the field strength calibration and output power calibration before the test;

[0037] During the test, the test distance of the system under test is adjusted, and the low-level signal output by the signal generator is adjusted based on the calibration reference power before the test, so that the absolute value of the difference between the total output power of each channel of the array power amplifier and the calibration reference power before the test is less than the error limit;

[0038] Select the test location and switch to adjust the polarization mode according to the test requirements, and perform radiation sensitivity tests on all frequencies and polarization modes of the current test point.

[0039] According to the method of the second aspect of the present invention, the error limit is determined by a test experiment outline.

[0040] The third aspect of the present invention discloses a system for measuring electric field before radiation sensitivity test, the system comprising:

[0041] A first processing module is configured to determine an irradiation position of the array transmitting antenna based on a test distance and a wave number range of the array transmitting antenna, and set a position of the array transmitting antenna in a test site according to the irradiation position;

[0042] The signal generator is configured to output a low-level signal of a specified frequency of the test according to a selected modulation mode in the absence of a system under test;

[0043] The array power amplifier is configured to amplify the generated low-level signal and output a high-power array signal;

[0044] An array transmitting antenna is configured to receive the high-power array signal and transmit the high-power array signal to the test site to apply a calibration electric field;

[0045] A field strength monitoring kit is configured to measure the applied calibration electric field to obtain a measured field strength value of the calibration electric field;

[0046] The control computer is configured to, if the measured field strength value does not reach the preset test field strength value, adjust the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value; and, if there is no abnormality in the output power of each channel of the array power amplifier, calculate the total output power of the array power amplifier based on the output power of each channel of the array power amplifier, and use the total output power as a calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

[0047] According to the system of the third aspect of the present invention, the field strength monitoring kit specifically comprises: a field strength probe and a display device;

[0048] The field intensity probe is placed on the surface of the test system and is used to measure the applied calibration electric field to obtain a measured field intensity value of the calibration electric field;

[0049] The display device is used to display and monitor the measured field strength value of the calibration electric field in real time;

[0050] Wherein, the field intensity probe transmits the measured field intensity value of the calibration electric field to the display device and the control computer via optical fiber.

[0051] According to the system of the third aspect of the present invention, the system further comprises a plurality of directional couplers, an oscilloscope and an array monitoring radio frequency switch unit, wherein the plurality of directional couplers, the oscilloscope and the array monitoring radio frequency switch unit are used to test the actual output power of each channel, and the actual transmission power of each corresponding channel is recorded;

[0052] The control computer is specifically configured to: determine whether there is an abnormality in each channel based on the factory test power data of the array power amplifier and the actual output power of each channel of the array power amplifier; if there is no abnormality in the output power of each channel of the array power amplifier, calculate the sum of the actual output power of each channel to obtain the total output power of the array power amplifier, and use the total output power as the calibration reference power before the test.

[0053] According to the system of the third aspect of the present invention, the directional coupler is specifically configured to couple the high-power array signals outputted in the forward and reverse directions of each channel of the array power amplifier into low-power signals, and connect them to the array monitoring RF switch unit through corresponding RF cables;

[0054] The array monitoring radio frequency switch unit is specifically configured to connect the coupled forward and reverse output power signals to the oscilloscope;

[0055] The oscilloscope is specifically configured to monitor the coupled forward and reverse output power signals with a selected detection type to obtain the forward and reverse actual output powers of each channel of the array power amplifier, and then calculate the actual output power of each channel of the array power amplifier.

[0056] According to the system of the third aspect of the present invention, a radio frequency switching synchronization signal is applied between the array monitoring radio frequency switch unit and the oscilloscope to ensure that the switching time of the array monitoring radio frequency switch unit is synchronized with the time of the coupled forward and reverse output power signals currently tested by the oscilloscope;

[0057] The actual forward or reverse output power of the current switching channel is recorded by the control computer, and compared with the factory test power data of the array power amplifier to determine whether there is an abnormality in each channel.

[0058] According to the system of the third aspect of the present invention, the control computer is also specifically configured to automatically compare the recorded actual forward or reverse output power of each channel with the factory test power data of the array power amplifier; when it is determined that the absolute value of the difference between the actual forward or reverse output power of a channel and the corresponding factory test power data is less than a preset threshold, it is determined that there is a power output abnormality in the channel.

[0059] According to the system of the third aspect of the present invention, the determination formula adopted by the control computer is expressed as:

[0060] |P _N -P _N_cal |≤η (1)

[0061] Among them, P _NIt is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB;

[0062] P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB;

[0063] η is the preset threshold value, which is given in the manufacturer's factory test report.

[0064] The electric field measurement scheme before the radiation sensitivity test proposed by the present invention has the following advantages:

[0065] 1) The total output power of the array power amplifier can be accurately measured in the test scenario with the test system, and compared with the calibration reference power before the test, which can reduce the total output power change of the array power amplifier caused by the inconsistent amplitude of each channel when the test site temperature, unit mutual coupling or power is adjusted significantly, thereby reducing the amplitude field strength error generated by the array power amplifier;

[0066] 2) The output power abnormality of one or several channels of the array power amplifier can be evaluated through factory data or maintenance test data to avoid changes in the measured field strength caused by changes in the total output power of the array power amplifier and antenna gain;

[0067] 3) By using the RF switching synchronization signal, the test time of each channel can be controlled in the ms level, ensuring that the total output power measurement time of the array power amplifier by the electric field measurement method before the test is in the hundreds of ms level, which is equivalent to the traditional single-channel power calibration time using a power meter, ensuring the test efficiency of the electric field measurement method before the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0069] Figure 1 is a flow chart of a method for measuring an electric field before a radiation sensitivity test according to an embodiment of the present invention;

[0070] Figure 2 A schematic diagram of fast switching monitoring of the forward and reverse signals of the array power amplifier using a radio frequency switch;

[0071] Figure 3 4 is a structural diagram of an electric field measurement system before a radiation sensitivity test according to an embodiment of the present invention. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0073] The first aspect of the present invention discloses a method for measuring electric field before radiation sensitivity test. Figure 1 FIG. 1 is a flow chart of a method for measuring an electric field before a radiation sensitivity test according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0074] Step S1, determining the irradiation position of the array transmitting antenna based on the test distance and the wave number range of the array transmitting antenna, and setting the position of the array transmitting antenna in the test site according to the irradiation position;

[0075] Step S2: In the absence of a test system, the signal generator outputs a low-level signal of a test specified frequency according to the selected modulation mode;

[0076] Step S3: the array power amplifier amplifies the generated low-level signal and outputs a high-power array signal, and outputs the high-power array signal to the array transmitting antenna to apply a calibration electric field to the test site;

[0077] Step S4: measuring the applied calibration electric field by means of a field strength monitoring kit to obtain a measured field strength value of the calibration electric field;

[0078] Step S5: if the measured field strength value does not reach the preset test field strength value, adjusting the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value;

[0079] Step S6: If there is no abnormality in the output power of each channel of the array power amplifier, the total output power of the array power amplifier is calculated based on the output power of each channel of the array power amplifier, and the total output power is used as the calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

[0080] In step S1, the irradiation position of the array transmitting antenna is determined based on the test distance and the wave number range of the array transmitting antenna, and the position of the array transmitting antenna in the test site is set according to the irradiation position.

[0081] Specifically, in this embodiment, before testing a large test system, in order to ensure that all parts of the test system are fully irradiated, the test site is first divided into several test areas in accordance with standards such as GJB8848-2016, and then the irradiation position for electromagnetic calibration or measurement is selected according to the test distance and the beam range of the array transmitting antenna.

[0082] For test scenarios with a large number of channels and fast test rate requirements, it is preferred to use an oscilloscope test. According to Appendix E of GJB8848-2016, an oscilloscope is a commonly used time domain measurement instrument with the advantages of fast speed, wide frequency range, high measurement accuracy, and the ability to measure single and transient signals.

[0083] In step S2, in the absence of a system under test, the signal generator outputs a low-level signal of a test specified frequency according to the selected modulation method.

[0084] Specifically, the modulation method of the signal generator in this embodiment includes a digital modulation method, a pulse modulation method, an angle modulation method, an analog modulation method, and the like.

[0085] In step S3, the array power amplifier amplifies the generated low-level signal to output a high-power array signal, and outputs the high-power array signal to the array transmitting antenna to apply a calibration electric field to the test site.

[0086] Specifically, in this embodiment, the high-power array signal output by the array power amplifier is output to the array transmitting antenna via a corresponding radio frequency cable.

[0087] In step S4, the applied calibration electric field is measured by a field strength monitoring kit to obtain a measured field strength value of the calibration electric field.

[0088] Specifically, in this embodiment, a field strength monitoring kit is used to measure the applied calibration electric field. The field strength monitoring kit specifically includes a field strength probe and a display device; the field strength probe is placed on the surface of the test system and is used to measure the applied calibration electric field to obtain the measured field strength value of the calibration electric field; the display device is used to display and monitor the measured field strength value of the calibration electric field in real time.

[0089] In step S5, if the measured field strength value does not reach the preset test field strength value, the amplitude of the low-level signal output by the signal generator is adjusted until the measured field strength value reaches the preset test field strength value.

[0090] Specifically, in this embodiment, the detection mode of the detector is selected according to the debugging mode selected according to the applied field strength, and the applied calibration field strength is adjusted to reach the field strength value required for the test by adjusting the output of the signal generator.

[0091] In step S6, if there is no abnormality in the output power of each channel of the array power amplifier, the total output power of the array power amplifier is calculated based on the output power of each channel of the array power amplifier, and the total output power is used as the calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

[0092] In some embodiments, step S6 in the method of the present invention specifically includes:

[0093] Step S61: using multiple directional couplers, oscilloscopes and array monitoring radio frequency switch units to test the actual output power of each channel, and recording the actual transmission power of each corresponding channel;

[0094] Step S62: determining whether each channel has an abnormality based on the factory test power data of the array power amplifier and the actual output power of each channel of the array power amplifier;

[0095] Step S63: If there is no abnormality in the output power of each channel of the array power amplifier, the sum of the actual output power of each channel is calculated to obtain the total output power of the array power amplifier, and the total output power is used as the calibration reference power before the test.

[0096] In some embodiments, step S61 in the method of the present invention specifically includes:

[0097] A directional coupler is used to couple the high-power array signals output in the forward and reverse directions of each channel of the array power amplifier into low-power signals, and the signals are connected to an array monitoring RF switch unit through a corresponding RF cable;

[0098] Connecting the coupled forward and reverse output power signals to the oscilloscope through the array monitoring radio frequency switch unit;

[0099] The oscilloscope monitors the coupled forward and reverse output power signals with the selected detection type to obtain the forward and reverse actual output power of each channel of the array power amplifier, and then calculates the actual output power of each channel of the array power amplifier.

[0100] In some embodiments, step S62 in the method of the present invention specifically includes:

[0101] A radio frequency switching synchronization signal is applied between the array monitoring radio frequency switch unit and the oscilloscope to ensure that the switching time of the array monitoring radio frequency switch unit is synchronized with the time of the coupled forward and reverse output power signals currently tested by the oscilloscope;

[0102] The actual forward or reverse output power of the current switching channel is recorded by a control computer, and compared with the factory test power data of the array power amplifier to determine whether there is an abnormality in each channel.

[0103] In some embodiments, the method of the present invention records the actual forward or reverse output power of the current switching channel by controlling the computer, and compares it with the factory test power data of the array power amplifier to determine whether each channel has an abnormality, specifically including:

[0104] Automatically comparing the recorded actual forward or reverse output power of each channel with the factory test power data of the array power amplifier by the control computer;

[0105] When the control computer determines that the absolute value of the difference between the actual forward or reverse output power of a channel and the corresponding factory test power data is less than a preset threshold, it is determined that the channel has a power output abnormality.

[0106] In some embodiments, the determination formula used by the control computer in the method of the present invention is expressed as:

[0107] |P _N -P _N_cal |≤η (1)

[0108] Among them, P _N It is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB;

[0109] P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB;

[0110] η is the preset threshold value, which is given in the manufacturer's factory test report.

[0111] Specifically, in this embodiment, a directional coupler is used to couple the high-power array signals output in the forward and reverse directions of each channel of the array power amplifier into low-power signals, which are then connected to the array monitoring RF switch unit through corresponding RF cables.

[0112] Then, the array monitoring RF switch unit is used to connect the monitoring power of the forward and reverse outputs of each channel of the array power amplifier to an oscilloscope (or receiver), and the selected detection type is used to monitor the forward and reverse power of the coupled output. For example, if the peak field strength is required, the power detection uses the average value detection, and the average value reading can be converted into peak power according to the modulation method and modulation parameters.

[0113] The measured field strength value is obtained by real-time monitoring of the field strength value by the field strength probe, and the signal amplitude output by the signal generator is continuously adjusted until the measured field strength value (i.e., the calibrated field strength value) reaches the field strength value required for the radiation sensitivity test (i.e., the preset test field strength value).

[0114] Among them, an RF switching synchronization signal is applied between the array monitoring RF switch unit (preferably a solid-state electronic switch) and the oscilloscope (or receiver) to ensure that the switching time of the array monitoring RF switch unit is synchronized with the time of the forward and reverse coupling signals currently tested by the oscilloscope (or receiver), and the forward and direction monitoring test data of the current switching channel are recorded by a computer. The test time of each channel can be controlled to the ms level through the switching of the solid-state electronic switch, ensuring the efficiency of the electric field measurement method before the test. The schematic diagram of the fast switching monitoring of the forward and reverse signals of the array power amplifier using the array monitoring RF switch unit is as follows Figure 2 shown.

[0115] The control computer can automatically record the forward or reverse monitoring test data of each calibration frequency according to the channel number (that is, the forward or reverse actual output power of each channel), and use this data to judge the abnormality and fault of each channel: the control computer automatically compares the forward monitoring test data of each calibration frequency automatically recorded according to the channel number (that is, the forward actual output power of each channel) _N Compared with the amplitude data P of the array power amplifier factory test _N_cal Comparison (the amplitude data of the factory test is pre-imported into the control computer for comparison processing). When the program of the control computer determines that the power of a channel monitoring test is less than the preset threshold value compared with the factory test power data, it can be determined that there is a power output abnormality.

[0116] |P _N -P _N_cal |≤η (1)

[0117] Among them, P _N It is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB;

[0118] P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB;

[0119] η is the preset threshold value, which is given in the manufacturer's factory test report.

[0120] When there is no output abnormality in the output power monitored by each channel, the output powers of all channels can be added together to obtain the total power output by the array power amplifier and recorded (all required frequency points and polarization tests must be completed). This power data is used as the reference power for calibration before the test to complete the field strength calibration of the electric field measurement method and the array output power calibration before the test.

[0121] In summary, the electric field measurement solution before the radiation sensitivity test proposed in the embodiment of the present invention has the following advantages:

[0122] 1) The total output power of the array power amplifier can be accurately measured in the test scenario with the test system, and compared with the calibration reference power before the test, which can reduce the total output power change of the array power amplifier caused by the inconsistent amplitude of each channel when the test site temperature, unit mutual coupling or power is adjusted significantly, thereby reducing the amplitude field strength error generated by the array power amplifier;

[0123] 2) The output power abnormality of one or several channels of the array power amplifier can be evaluated through factory data or maintenance test data to avoid changes in the measured field strength caused by changes in the total output power of the array power amplifier and antenna gain;

[0124] 3) By using the RF switching synchronization signal, the test time of each channel can be controlled in the ms level, ensuring that the total output power measurement time of the array power amplifier by the electric field measurement method before the test is in the hundreds of ms level, which is equivalent to the traditional single-channel power calibration time using a power meter, ensuring the test efficiency of the electric field measurement method before the test.

[0125] The first aspect of the present invention discloses a radiation sensitivity testing method, the method comprising:

[0126] The method described in any one of the above items of the first aspect of the present invention is used to obtain a calibration reference power before the test, and to complete the field strength calibration and output power calibration before the test;

[0127] During the test, the test distance of the system under test is adjusted, and the low-level signal output by the signal generator is adjusted based on the calibration reference power before the test, so that the absolute value of the difference between the total output power of each channel of the array power amplifier and the calibration reference power before the test is less than the error limit;

[0128] Select the test location and switch to adjust the polarization mode according to the test requirements, and perform radiation sensitivity tests on all frequencies and polarization modes of the current test point.

[0129] In some embodiments, the error limits in the methods of the present invention are determined by a test protocol.

[0130] Specifically, after the calibration is completed in this embodiment, during the test, the test distance is adjusted in the presence of the test system, the output of the signal generator is adjusted, and the total output power of each channel of the array power amplifier is adjusted to meet the error range of the calibration reference power before the test:

[0131] |P_ toatal (dB)-P_ cal (dB)|≤ε

[0132] P_ toatal (dB) is the logarithmic form of the total output power of each channel of the array power amplifier during the test;

[0133] P_ cal (dB) is the logarithmic form of the total output power of each channel of the array power amplifier during the electric field measurement and calibration before the test;

[0134] ε is the error limit for judging whether the test requirements are met, which is generally determined by the test program.

[0135] After that, the test location can be selected and the polarization mode can be switched and adjusted according to the experimental requirements to complete the radiation sensitivity test of all frequencies and polarization modes at the current test point;

[0136] Finally, the entire test system and the radiation test antenna are moved to the next test point to conduct a radiation sensitivity test on the next area, and so on to complete the full-scale radiation experiment of the large object under test.

[0137] The third aspect of the present invention discloses an electric field measurement system before a radiation sensitivity test. Figure 3 FIG. 4 is a structural diagram of an electric field measurement system before a radiation sensitivity test according to an embodiment of the present invention; Figure 3 As shown, the system comprises:

[0138] A first processing module is configured to determine an irradiation position of the array transmitting antenna based on a test distance and a wave number range of the array transmitting antenna, and set a position of the array transmitting antenna in a test site according to the irradiation position;

[0139] The signal generator is configured to output a low-level signal of a specified frequency of the test according to a selected modulation mode in the absence of a system under test;

[0140] The array power amplifier is configured to amplify the generated low-level signal and output a high-power array signal;

[0141] An array transmitting antenna is configured to receive the high-power array signal and transmit the high-power array signal to the test site to apply a calibration electric field;

[0142] A field strength monitoring kit is configured to measure the applied calibration electric field to obtain a measured field strength value of the calibration electric field;

[0143] The control computer is configured to, if the measured field strength value does not reach the preset test field strength value, adjust the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value; and, if there is no abnormality in the output power of each channel of the array power amplifier, calculate the total output power of the array power amplifier based on the output power of each channel of the array power amplifier, and use the total output power as a calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

[0144] In some embodiments, the field strength monitoring kit in the system of the present invention specifically includes: a field strength probe and a display device;

[0145] The field intensity probe is placed on the surface of the test system and is used to measure the applied calibration electric field to obtain a measured field intensity value of the calibration electric field;

[0146] The display device is used to display and monitor the measured field strength value of the calibration electric field in real time;

[0147] Wherein, the field intensity probe transmits the measured field intensity value of the calibration electric field to the display device and the control computer via optical fiber.

[0148] In some embodiments, the system of the present invention further comprises a plurality of directional couplers, an oscilloscope and an array monitoring radio frequency switch unit, and the actual output power of each channel is tested by using the plurality of directional couplers, an oscilloscope and an array monitoring radio frequency switch unit, and the actual transmission power of each corresponding channel is recorded;

[0149] The control computer is specifically configured to: determine whether there is an abnormality in each channel based on the factory test power data of the array power amplifier and the actual output power of each channel of the array power amplifier; if there is no abnormality in the output power of each channel of the array power amplifier, calculate the sum of the actual output power of each channel to obtain the total output power of the array power amplifier, and use the total output power as the calibration reference power before the test.

[0150] In some embodiments, the directional coupler in the system of the present invention is specifically configured to couple the high-power array signals outputted in the forward and reverse directions of each channel of the array power amplifier into low-power signals, and connect them to the array monitoring RF switch unit through corresponding RF cables;

[0151] The array monitoring radio frequency switch unit is specifically configured to connect the coupled forward and reverse output power signals to the oscilloscope;

[0152] The oscilloscope is specifically configured to monitor the coupled forward and reverse output power signals with a selected detection type to obtain the forward and reverse actual output powers of each channel of the array power amplifier, and then calculate the actual output power of each channel of the array power amplifier.

[0153] In some embodiments, in the system of the present invention, a radio frequency switching synchronization signal is applied between the array monitoring radio frequency switch unit and the oscilloscope to ensure that the switching time of the array monitoring radio frequency switch unit is synchronized with the time of the coupled forward and reverse output power signals currently tested by the oscilloscope;

[0154] The actual forward or reverse output power of the current switching channel is recorded by the control computer, and compared with the factory test power data of the array power amplifier to determine whether there is an abnormality in each channel.

[0155] In some embodiments, the control computer in the system of the present invention is also specifically configured to automatically compare the recorded actual forward or reverse output power of each channel with the factory test power data of the array power amplifier; when it is determined that the absolute value of the difference between the actual forward or reverse output power of a channel and the corresponding factory test power data is less than a preset threshold, it is determined that there is a power output abnormality in the channel.

[0156] In some embodiments, the determination formula used by the control computer in the system of the present invention is expressed as:

[0157] |P _N -P _N_cal |≤η (1)

[0158] Among them, P _N It is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB;

[0159] P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB;

[0160] η is the preset threshold value, which is given in the manufacturer's factory test report.

[0161] Specifically, the test system of this embodiment can be used to perform radiation sensitivity tests on large-sized test systems in a large microwave darkroom or in an open field, and includes: a signal generator, an oscilloscope or a receiver (including a detector), a detector, an array power amplifier, an array transmitting antenna, an array monitoring RF switch, a field strength monitoring kit, a directional coupler, a control computer and data transmission equipment, cables and connectors and other test accessories.

[0162] Among them, the signal generator is used to generate low-level signals of different frequencies and styles (such as continuous wave, pulse, amplitude modulation, phase modulation, etc.). The oscilloscope (or receiver) includes at least one host and two power test channels, which can be used to monitor the output and reflected power values ​​of each channel of the array power amplifier. The host is used to display the power values ​​of the two power test channels. The array power amplifier is used to amplify the low-level signal generated by the signal generator, output a high-power array signal, and then output it to the array transmitting antenna through an RF cable. The array transmitting antenna radiates the high-power signal output by the array power amplifier into space. The directional coupler is used to couple the high-level signals of the forward and reverse outputs of the power amplifier into low-level signals, and then connect them to the array monitoring RF switch through an RF cable. The array monitoring RF switch is used to quickly switch the forward output power and reverse reflected power monitoring values ​​of each channel of the array power amplifier to the two monitoring channels of the oscilloscope (receiver) through the RF switch for real-time monitoring. The field strength monitoring kit includes a field strength probe (or receiving antenna) and a display device. The field strength probe (or receiving antenna) is placed on the surface of the test system, and the detected field strength value is transmitted to the display device via optical fiber to monitor the current radiation field strength value.

[0163] Please note that the technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. The above embodiments only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several variations and improvements can be made, which all belong to the scope of protection of the present application. Therefore, the scope of protection of the patent in this application shall be based on the attached claims.

[0164] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for measuring electric field before radiation sensitivity test, characterized in that: The method comprises: Step S1, determining the irradiation position of the array transmitting antenna based on the test distance and the wave number range of the array transmitting antenna, and setting the position of the array transmitting antenna in the test site according to the irradiation position; Step S2: In the absence of a test system, the signal generator outputs a low-level signal of a test specified frequency according to the selected modulation mode; Step S3: the array power amplifier amplifies the generated low-level signal and outputs a high-power array signal, and outputs the high-power array signal to the array transmitting antenna to apply a calibration electric field to the test site; Step S4: measuring the applied calibration electric field by means of a field strength monitoring kit to obtain a measured field strength value of the calibration electric field; Step S5: if the measured field strength value does not reach the preset test field strength value, adjusting the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value; Step S6: If there is no abnormality in the output power of each channel of the array power amplifier, the total output power of the array power amplifier is calculated based on the output power of each channel of the array power amplifier, and the total output power is used as the calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

2. The method for measuring electric field before radiation sensitivity test according to claim 1, characterized in that: The step S6 specifically includes: Step S61: using multiple directional couplers, oscilloscopes and array monitoring radio frequency switch units to test the actual output power of each channel, and recording the actual transmission power of each corresponding channel; Step S62: determining whether each channel has an abnormality based on the factory test power data of the array power amplifier and the actual output power of each channel of the array power amplifier; Step S63: If there is no abnormality in the output power of each channel of the array power amplifier, the sum of the actual output power of each channel is calculated to obtain the total output power of the array power amplifier, and the total output power is used as the calibration reference power before the test.

3. The method for measuring electric field before radiation sensitivity test according to claim 2, characterized in that: The step S61 specifically includes: A directional coupler is used to couple the high-power array signals output in the forward and reverse directions of each channel of the array power amplifier into low-power signals, and the signals are connected to an array monitoring RF switch unit through a corresponding RF cable; Connecting the coupled forward and reverse output power signals to the oscilloscope through the array monitoring radio frequency switch unit; The oscilloscope monitors the coupled forward and reverse output power signals with the selected detection type to obtain the forward and reverse actual output power of each channel of the array power amplifier, and then calculates the actual output power of each channel of the array power amplifier.

4. The method for measuring electric field before radiation sensitivity test according to claim 3, characterized in that: The step S62 specifically includes: A radio frequency switching synchronization signal is applied between the array monitoring radio frequency switch unit and the oscilloscope to ensure that the switching time of the array monitoring radio frequency switch unit is synchronized with the time of the coupled forward and reverse output power signals currently tested by the oscilloscope; The actual forward or reverse output power of the current switching channel is recorded by a control computer, and compared with the factory test power data of the array power amplifier to determine whether there is an abnormality in each channel.

5. The method for measuring electric field before radiation sensitivity test according to claim 4, characterized in that: The controlling computer records the actual forward or reverse output power of the current switching channel and compares it with the factory test power data of the array power amplifier to determine whether each channel has an abnormality, specifically including: Automatically comparing the recorded actual forward or reverse output power of each channel with the factory test power data of the array power amplifier by the control computer; When the control computer determines that the absolute value of the difference between the actual forward or reverse output power of a channel and the corresponding factory test power data is less than a preset threshold, it is determined that the channel has a power output abnormality.

6. The method for measuring electric field before radiation sensitivity test according to claim 5, characterized in that: The determination formula adopted by the control computer is expressed as: |P _N - P _N_cal |≤η (1) Among them, P _N It is the logarithmic form of the output power of the Nth channel of the array power amplifier during the test, in dB; P _N_cal It is the logarithmic form of the output power of the Nth channel of the array power amplifier when it leaves the factory, in dB; η is the preset threshold value, which is given in the manufacturer's factory test report.

7. A radiation sensitivity testing method, characterized in that: The method comprises: Adopting a method for measuring electric field before a radiation sensitivity test as described in any one of claims 1 to 6 to obtain a calibration reference power before the test, and completing field strength calibration and output power calibration before the test; During the test, the test distance of the system under test is adjusted, and the low-level signal output by the signal generator is adjusted based on the calibration reference power before the test, so that the absolute value of the difference between the total output power of each channel of the array power amplifier and the calibration reference power before the test is less than the error limit; Select the test location and switch to adjust the polarization mode according to the test requirements, and perform radiation sensitivity tests on all frequencies and polarization modes of the current test point.

8. A radiation sensitivity testing method according to claim 7, characterized in that: The error limits are determined by the test program.

9. A system for measuring electric field before radiation sensitivity test, characterized in that: The system comprises: A first processing module is configured to determine an irradiation position of the array transmitting antenna based on a test distance and a wave number range of the array transmitting antenna, and set a position of the array transmitting antenna in a test site according to the irradiation position; The signal generator is configured to output a low-level signal of a specified frequency of the test according to a selected modulation mode in the absence of a system under test; The array power amplifier is configured to amplify the generated low-level signal and output a high-power array signal; An array transmitting antenna is configured to receive the high-power array signal and transmit the high-power array signal to the test site to apply a calibration electric field; A field strength monitoring kit is configured to measure the applied calibration electric field to obtain a measured field strength value of the calibration electric field; The control computer is configured to, if the measured field strength value does not reach the preset test field strength value, adjust the amplitude of the low-level signal output by the signal generator until the measured field strength value reaches the preset test field strength value; and, if there is no abnormality in the output power of each channel of the array power amplifier, calculate the total output power of the array power amplifier based on the output power of each channel of the array power amplifier, and use the total output power as a calibration reference power before the test to complete the field strength calibration and output power calibration before the test.

10. The electric field measurement system before radiation sensitivity test according to claim 9, characterized in that: The field strength monitoring kit specifically includes: a field strength probe and a display device; The field intensity probe is placed on the surface of the test system and is used to measure the applied calibration electric field to obtain a measured field intensity value of the calibration electric field; The display device is used to display and monitor the measured field strength value of the calibration electric field in real time; Wherein, the field intensity probe transmits the measured field intensity value of the calibration electric field to the display device and the control computer via optical fiber.

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