CN112327060B - Double-wire double-terminal large current injection equivalent strong field continuous wave radiation effect test and system - Google Patents

Abstract

The invention discloses a double-wire equivalent strong field continuous wave radiation effect test. The method includes the following steps: 1) monitoring equipment at both ends of a cable, 2) carrying out an injection pre-test, and 3) carrying out a low-field-strength electromagnetic Radiation pre-test, 4) Carry out the equivalent injection test, 5) The results obtained from the injection test are equivalent to the high-field electromagnetic radiation test; the corresponding system of the above method includes the dual-line radiation test and the dual-line injection test configuration module when the terminal equipment response can be monitored , and the configuration module for the dual-line low-field-strength radiation test and the dual-line injection equivalent low-field-strength radiation test when the terminal equipment response cannot be monitored; , mainly for the interconnection system in which the interconnection cables are parallel wires or twisted pairs, the method has the advantage of being able to perform an equivalent high-field electromagnetic radiation test under the condition that the response of the device under test is nonlinear.

Description

Double-wire double-terminal large current injection equivalent strong field continuous wave radiation effect test and system

technical field

The invention relates to a continuous wave electromagnetic radiation effect test method, in particular to a double-wire double-terminal high current injection equivalent strong field continuous wave radiation effect test and system, which belongs to the technical field of electromagnetic radiation effect test.

Background technique

With the development of science and technology, frequency-using equipment in various fields is increasing, including high-power frequency-using equipment. Especially in the military field, with the use of strong electromagnetic pulse weapons and high-power frequency-using equipment, the location of equipment The electromagnetic environment is becoming increasingly harsh; this high-intensity radiation field (HIRF) interference may make the equipment unable to maintain normal work, not only that, it may also cause hard damage or even scrap the equipment; therefore, through the electromagnetic radiation effect on the equipment Tests to evaluate the safety performance of equipment are becoming more and more urgent; the current requirements for electromagnetic compatibility and field strength test standards for electromagnetic radiation sensitivity are constantly improving. GJB1389A-2005 pointed out that the harsh electromagnetic environment faced by army helicopters is in the 2.7-3.6GHz frequency band The internal peak field strength may be as high as 27460V/m, and the peak field strength exceeds 2000V/m in most frequency bands; usually, the electromagnetic interference coupling channels of weaponry mainly include: antennas, cables, holes, shielding transmission, etc. ; Nowadays, most advanced weapon systems in various countries tend to be functionally integrated and complex, with various electronic devices all over the interior, and cables are often used to interconnect each device or subsystem to achieve information transmission or power transmission; the interconnection system relies on cables As a result, the cable coupling channel has become one of the weak links in the electromagnetic protection of the interconnection system; therefore, whether the electromagnetic interference introduced by the interconnection cable coupling will lead to the generation of electromagnetic effects must be evaluated in advance through the strong field electromagnetic environment effect test; however, the traditional Due to the limitations of the full-level electromagnetic radiation test method, it is unrealistic to simulate such a high-field electromagnetic environment under current laboratory conditions, and it is even more difficult to simulate a large spatial range; how to Responding to the contradiction between the laboratory electromagnetic environment simulation conditions and the electromagnetic compatibility test requirements is the top priority in the research of electromagnetic radiation effect testing; in this context, the method of using current injection to replace radiation sensitivity came into being, and It has gradually been applied and developed in many fields; however, the current current injection method is mainly used for conduction sensitivity test, and there are relatively few studies on its use in equivalent radiation sensitivity test; the current injection method mainly includes large current injection ( BCI) method, direct current injection (DCI) method and pulsed current injection (PCI) method, etc.; BCI is a common mode injection method using a ferrite injection probe, and the interference signal is first coupled to the interconnection cable through the injection probe, and further The EUT coupled to the cable terminal in a conductive manner; as a conductive susceptibility test method, BCI has been widely accepted, especially in the military and automotive industries; A series of test methods for electromagnetic safety verification; Among them, for the case where the cable is the coupling path, it is proposed to use the large current injection method (BCI) to carry out the equivalent test; the current injection method has the advantages of high efficiency and good repeatability, and can be used in a certain Under the restricted conditions, this method has high engineering application value; however, this method also has its own problems, the most important of which is about the equipment under test ( EUT) response is nonlinear, using the method of linearly extrapolating the relationship between the radiation field strength and the cable induced current may lead to large errors in the test; usually, in the BCI test for radiation sensitivity assessment, Generally, only one BCI injection probe is used on the same interconnection cable; this test configuration is suitable for the case where only one end of the interconnection cable is connected to the EUT, and the other end of the cable is connected to auxiliary equipment, and its electromagnetic susceptibility generally does not need to be assessed; however , sometimes the electromagnetic susceptibility of the equipment at both ends of the cable needs to be assessed at the same time. Sergio Pignari et al. proposed a double-ended high current injection technology; this technology connects an injection probe at both ends of the cable, and by controlling the amplitude and phase difference of the two injected voltage sources, it can ensure that the response of the equipment at both ends of the cable is uniform. It is consistent with the radiation time; this method obtains the injection source parameters through calculation, so the accuracy of the test results largely depends on whether the relevant system parameter values can be accurately known in advance, and these parameters are difficult to obtain accurately in engineering tests; in addition, the current Some double-ended high-current injection technologies still do not consider how to achieve the equivalent of the strong electric field radiation effect test when the equipment at both ends produces a nonlinear response; parallel twin wires and twisted-pair wires are commonly used cables in engineering, how to It is a key technical problem to be solved that the equipment at both ends is a nonlinear two-wire interconnection system to carry out a large current injection equivalent strong field radiation effect test.

Contents of the invention

In order to solve the above problems, the present invention proposes a double-wire double-ended large current injection equivalent strong field continuous wave radiation effect test and system, mainly for the interconnection system where the interconnection cables are parallel wires or twisted-pair wires. The method has the following advantages: Advantages of being able to perform equivalent high-field electromagnetic radiation tests where the response of the EUT is non-linear.

Double line equivalent strong field continuous wave electromagnetic radiation effect test of the present invention, described method comprises the following steps:

1) Monitor the equipment at both ends of the cable. When there is no monitorable output response from the equipment at both ends of the cable, connect the photoelectric conversion device to the two terminals of the cable in parallel, and connect the output of the photoelectric conversion device to the receiver. For the cable If the output response of the equipment at both ends can be monitored, its output is connected to the receiver through the photoelectric conversion equipment;

2) Carry out injection pre-test, for each test frequency point, adjust the position of the two injection probes on the cable to maximize the injection efficiency;

3) Carry out the low-field-strength electromagnetic radiation pre-test, select the appropriate radiation field strength value E1, so that the response of the equipment under test is in the linear region and the response amplitude can be accurately monitored. Then, use a vector network analyzer to test the difference between the equipment at both ends. Mode response amplitude and phase difference;

4) Carry out an equivalent injection test, divide the output of the same signal source into two paths through a power divider, add an adjustable attenuator and an adjustable phase shifter on the two branches, and then connect the two paths of signals to two injection probes, Adjust the signal source, attenuator, and phase shifter so that the amplitude and phase difference of the two terminal responses are consistent with the radiation, and the injection source voltage U1 is obtained at this time, and the proportional coefficient k1=U1/ E1, multiple tests to obtain the average value of k1;

5) For the situation where the response of the device under test cannot be directly monitored, at this time, the two ends of the cable are reconnected to the actual device under test. For the case where the response of the device under test can be directly monitored, the above reconnection steps are omitted, and the cable posture and The position of the injection probe remains unchanged, and the equivalent injection voltage value is calculated according to the field strength value E2 of the strong field radiation test. The attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged. The obtained results are equivalent to the strong field electromagnetic radiation test.

A two-wire double-terminal high current injection equivalent strong field continuous wave radiation effect test and system, the system includes a two-wire radiation test configuration module when the terminal equipment response can be monitored, and a two-line injection test configuration when the terminal equipment response can be monitored module, and the two-line low-field-strength radiation test configuration module when the terminal equipment response cannot be monitored, and the two-line injection equivalent low-field-strength radiation test configuration module when the terminal equipment response cannot be monitored;

The two-wire radiation test configuration module when the response of the terminal equipment can be monitored includes a two-wire body, and devices arranged at both ends of the two-wire body, the output of the device is connected to an electro-optical conversion device, and the electro-optic conversion device is connected to the photoelectric conversion device through an optical fiber The photoelectric replacement device is connected to the receiver; the two ends of the double-wire body are provided with injection probes, and the input port of the injection probe is connected with a matching load; the outside of the double-wire body is provided with a radiation excitation source; for the output The equivalent relationship between the field strength and the injected voltage is measured when both ends of the cable are connected to the photoelectric receiver in parallel. When the two ends of the cable are connected to the actual equipment under test, the above field strength The equivalent relationship with the injected voltage remains unchanged; during the low-field electromagnetic radiation test, the two-wire interconnection system is placed in an anechoic chamber or an open field environment, and a high-current injection probe is connected to a suitable position on both sides of the cable. The input port is connected to a matching load; the radiation antenna position is selected according to the electromagnetic radiation sensitivity test requirements in the electromagnetic compatibility standard, and the antenna is connected to the signal source and power amplifier; a vector network analyzer with a receiver mode and capable of testing the phase difference between ports is used to test The amplitude and phase difference of the response of the two terminals; during the injection test, the positions of the two injection probes remain unchanged, and their ports are connected to the injection source, and the output of the same signal source is divided into two paths through the power divider, and the two branches are respectively connected to the adjustable attenuator And the adjustable phase shifter, also use the above-mentioned vector network analyzer to test the amplitude and phase difference of the response of the two terminals;

The two-wire injection test configuration module when the response of the terminal equipment can be monitored includes a two-wire body, and devices arranged at both ends of the two-wire body, the output of the device is connected to an electro-optical conversion device, and the electro-optic conversion device is connected to the photoelectric conversion device through an optical fiber The photoelectric replacement device is connected to the receiver; the two ends of the double-wire body are provided with an injection probe, and the input port of the injection probe is connected to an injection excitation source;

When the response of the terminal equipment cannot be monitored, the two-wire low-field radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optic conversion device The photoelectric conversion equipment is connected through an optical fiber; the photoelectric conversion equipment is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to a matching load; the outside of the double-wire body is provided with Radiation excitation source;

When the response of the terminal equipment cannot be monitored, the double-wire injection equivalent low-field-strength radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optical conversion device is connected to the photoelectric conversion device through an optical fiber; the photoelectric conversion device is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to an injection excitation source;

The injection excitation source includes a signal source, the output of the signal source is connected to a power divider, and the output of the power divider is respectively connected to an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and adjustable attenuator The device is connected to two injection probes respectively.

Further, the radiation excitation source selects the position of the radiation antenna according to the electromagnetic radiation sensitivity test requirements in the electromagnetic compatibility standard, and the antenna is connected to the signal source and the power amplifier.

Further, a vector network analyzer is set at the receiver; the vector network analyzer is a vector network analyzer with a receiver mode and capable of testing the phase difference between ports.

Compared with the prior art, the double-wire double-terminal large current injection equivalent strong field continuous wave radiation effect test and system of the present invention has the following advantages:

1. Through this injection method, the equivalent of the strong field electromagnetic radiation test can be realized under the condition that the responses at both ends of the cable appear nonlinear, which solves the limitations of the existing technical methods.

2. By selecting a high-current injection probe with an available upper frequency greater than 400MHz, it can break through the limitation of the existing high-current injection method applied below 400MHz, and provide technical means for the assessment of the strong field electromagnetic environment effect of high-speed cable interconnection systems.

Description of drawings

Fig. 1 is a schematic diagram of the radiation test configuration of the two-wire interconnection system when the terminal equipment response of the present invention can be monitored.

Fig. 2 is a schematic diagram of the injection test configuration of the two-wire interconnection system when the response of the terminal equipment can be monitored in the present invention.

Fig. 3 is a schematic diagram of the configuration of the low-field-strength radiation test of the two-wire interconnection system when the response of the terminal equipment of the present invention cannot be monitored.

Fig. 4 is a schematic diagram of the injection equivalent low field strength radiation test configuration of the two-wire interconnection system when the response of the terminal equipment of the present invention cannot be monitored.

Fig. 5 is a schematic diagram of the test configuration of the injection equivalent strong field strength radiation test of the two-wire interconnection system when the response of the terminal equipment of the present invention cannot be monitored.

Fig. 6 is a configuration block diagram of the electromagnetic radiation effect test of the tested two-wire interconnection system of the present invention.

Fig. 7 is a configuration block diagram of the equivalent injection test of the tested two-wire interconnection system of the present invention.

Fig. 8 is a schematic diagram of the test results of the double-terminal high current injection equivalent strong field electromagnetic radiation of the parallel two-wire interconnection system of the present invention.

Fig. 9 is a schematic diagram of the test configuration for double-terminal high-current common-mode injection of the present invention.

Fig. 10 is a schematic diagram of an equivalent network model for double-ended injection in the present invention.

Fig. 11 is a schematic diagram of the electromagnetic radiation test configuration of the present invention.

Fig. 12 is a schematic diagram of an equivalent network model during electromagnetic radiation of the present invention.

Detailed ways

Example 1:

As shown in Figures 1 to 7, a double-wire double-terminal large current injection equivalent strong field continuous wave radiation effect test and system, the method includes the following steps:

1) Monitor the equipment at both ends of the cable. When there is no monitorable output response from the equipment at both ends of the cable, connect the photoelectric conversion device to the two terminals of the cable in parallel, and connect the output of the photoelectric conversion device to the receiver. For the cable If the output response of the equipment at both ends can be monitored, its output is connected to the receiver through the photoelectric conversion equipment;

2) Carry out injection pre-test, for each test frequency point, adjust the position of the two injection probes on the cable to maximize the injection efficiency;

3) Carry out the low-field-strength electromagnetic radiation pre-test, select the appropriate radiation field strength value E1, so that the response of the equipment under test is in the linear region and the response amplitude can be accurately monitored. Then, use a vector network analyzer to test the difference between the equipment at both ends. Mode response amplitude and phase difference;

4) Carry out an equivalent injection test, divide the output of the same signal source into two paths through a power divider, add an adjustable attenuator and an adjustable phase shifter on the two branches, and then connect the two paths of signals to two injection probes, Adjust the signal source, attenuator, and phase shifter so that the amplitude and phase difference of the two terminal responses are consistent with the radiation, and the injection source voltage U1 is obtained at this time, and the proportional coefficient k1=U1/ E1, multiple tests to obtain the average value of k1;

5) For the situation where the response of the device under test cannot be directly monitored, at this time, the two ends of the cable are reconnected to the actual device under test. For the case where the response of the device under test can be directly monitored, the above reconnection steps are omitted, and the cable posture and The position of the injection probe remains unchanged, and the equivalent injection voltage value is calculated according to the field strength value E2 of the strong field radiation test. The attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged. The obtained results are equivalent to the strong field electromagnetic radiation test.

A two-wire double-terminal high current injection equivalent strong field continuous wave radiation effect test and system, the system includes a two-wire radiation test configuration module when the terminal equipment response can be monitored, and a two-line injection test configuration when the terminal equipment response can be monitored module, and the two-line low-field-strength radiation test configuration module when the terminal equipment response cannot be monitored, and the two-line injection equivalent low-field-strength radiation test configuration module when the terminal equipment response cannot be monitored;

The two-wire radiation test configuration module when the response of the terminal equipment can be monitored includes a two-wire body, and devices arranged at both ends of the two-wire body, the output of the device is connected to an electro-optical conversion device, and the electro-optic conversion device is connected to the photoelectric conversion device through an optical fiber The photoelectric replacement device is connected to the receiver; the two ends of the double-wire body are provided with injection probes, and the input port of the injection probe is connected with a matching load; the outside of the double-wire body is provided with a radiation excitation source; for the output The equivalent relationship between the field strength and the injected voltage is measured when both ends of the cable are connected to the photoelectric receiver in parallel. When the two ends of the cable are connected to the actual equipment under test, the above field strength The equivalent relationship with the injected voltage remains unchanged; during the low-field electromagnetic radiation test, the two-wire interconnection system is placed in an anechoic chamber or an open field environment, and a high-current injection probe is connected to a suitable position on both sides of the cable. The input port is connected to a matching load; the radiation antenna position is selected according to the electromagnetic radiation sensitivity test requirements in the electromagnetic compatibility standard, and the antenna is connected to the signal source and power amplifier; a vector network analyzer with a receiver mode and capable of testing the phase difference between ports is used to test The amplitude and phase difference of the response of the two terminals; during the injection test, the positions of the two injection probes remain unchanged, and their ports are connected to the injection source, and the output of the same signal source is divided into two paths through the power divider, and the two branches are respectively connected to the adjustable attenuator And the adjustable phase shifter, also use the above-mentioned vector network analyzer to test the amplitude and phase difference of the response of the two terminals;

The two-wire injection test configuration module when the response of the terminal equipment can be monitored includes a two-wire body, and devices arranged at both ends of the two-wire body, the output of the device is connected to an electro-optical conversion device, and the electro-optic conversion device is connected to the photoelectric conversion device through an optical fiber The photoelectric replacement device is connected to the receiver; the two ends of the double-wire body are provided with an injection probe, and the input port of the injection probe is connected to an injection excitation source;

When the response of the terminal equipment cannot be monitored, the two-wire low-field radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optic conversion device The photoelectric conversion equipment is connected through an optical fiber; the photoelectric conversion equipment is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to a matching load; the outside of the double-wire body is provided with Radiation excitation source;

When the response of the terminal equipment cannot be monitored, the double-wire injection equivalent low-field-strength radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optical conversion device is connected to the photoelectric conversion device through an optical fiber; the photoelectric conversion device is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to an injection excitation source;

The injection excitation source includes a signal source, the output of the signal source is connected to a power divider, and the output of the power divider is respectively connected to an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and adjustable attenuator The device is connected to two injection probes respectively.

Wherein, the radiation excitation source selects the position of the radiation antenna according to the electromagnetic radiation sensitivity test requirements in the electromagnetic compatibility standard, and the antenna is connected to the signal source and the power amplifier. A vector network analyzer is set at the receiver; the vector network analyzer is a vector network analyzer with a receiver mode and capable of testing the phase difference between ports.

Example 2:

Taking the parallel two-wire interconnection system as an example to verify the effectiveness of this test method, in order to verify the accuracy of the test method when the impedance of the equipment port at both ends of the cable changes significantly, the test is carried out by artificially changing the impedance of the equipment under test. The details are as follows : Use the pass-through load as the test equipment at both ends of the cable, connect the pass-through loads with different resistance values at both ends of the cable during the high and low field intensity radiation test, and simulate the change of the port impedance of the test equipment during the high-field electromagnetic radiation test Happening;

As shown in Figure 6 and Figure 7; the situation that the equipment under test does not have an output response that can be easily monitored is selected as an example for verification. The test is carried out in an anechoic chamber. The splitter is divided into two paths, and an adjustable attenuator and an adjustable phase shifter are added to the two branches respectively, and then the signals of the two paths are connected to two injection probes; the equipment at both ends of the cable is connected to the anechoic chamber through a photoelectric conversion device. take measurements;

The test method is:

1) For a certain test frequency, first carry out the current injection pre-test, and adjust the position of the injection probe on the cable to avoid low injection efficiency;

2) Carry out low field strength electromagnetic radiation pre-test, select the appropriate radiation field strength value E1 to ensure that the response of the equipment under test can be accurately monitored, and use a vector network analyzer to test the response amplitude and phase difference of the equipment at both ends;

3) Carry out the equivalent injection test, adjust the signal source, attenuator and phase shifter, so that the amplitude and phase difference of the two terminal responses are consistent with the radiation time, obtain the injection source voltage U1 at this time, and obtain the field strength and equivalent injection The proportional coefficient of voltage k1=U1/E1, and the average value of k1 is obtained from multiple tests;

4) Change the two ends of the cable to pass-through loads with different resistance values, keep the cable posture and the position of the injection probe unchanged, and carry out the field strength value E2 of the strong field radiation test as required. E2 is 10dB higher than E1. The equivalent injection voltage value is calculated, the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged, and the response at both ends of the equivalent injection test of electromagnetic radiation is obtained;

5) Reconnect both ends of the cable to through-type loads with different resistances, keep the cable posture and the position of the injection probe unchanged, and carry out the field strength value E3 of the strong field radiation test as required. E3 is 10dB higher than E2 , the equivalent injection voltage value is calculated, the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged, and the response at both ends obtained from the equivalent injection test of electromagnetic radiation is obtained;

Among them, since each injection source contributes to the response at both ends, it is necessary to repeatedly adjust the amplitude and phase of the output of the injection source several times during the injection test to ensure that the terminal response is consistent with the radiation.

The test results are shown in Figure 8. From the test results, it can be seen that the test error is small and can meet the engineering test requirements. The main reasons for the error are:

1) In the equivalent injection test of low-field-strength radiation, the amplitude and phase of the two injection sources deviate, which leads to an increase in the error of the extrapolation test;

2) During the test, the attitude of the cable will inevitably change to a certain extent, resulting in a change in the equivalent relationship between the field strength and the injected voltage, thus increasing the test error.

The above test results show that the double-line equivalent strong field continuous wave electromagnetic radiation effect test proposed by the present invention is effective and feasible.

When monitoring the response of the equipment under test at both ends of the cable, if there is no output response of the two equipment under test that can be monitored, the response of the input port of the two equipment under test can be tested by connecting in parallel. The effect relationship has nothing to do with the characteristics of the equipment under test at both ends, so this test method will not affect the accuracy of the equivalent injection method, and its verification is as follows:

The test configuration of double-ended injection is shown in Figure 9, and its equivalent simplified network model is shown in Figure 10, which is similar to the single-ended injection method.

F _P1 ＝(V _S1 -Y _P1 V _S1 ) ^T (8)

F _P2 ＝(V _S2 -Y _P2 ·V _S2 ) ^T (9)

V _S1 = V _S1 (1 0) ^T (15)

V _S2 = V _S2 (1 0) ^T (16)

为左端探头耦合到平行双线上的共模阻抗，

为左端探头耦合到平行双线上的差模阻抗，

为左端探头耦合到平行双线上的共模导纳，

为左端探头耦合到平行双线上的差模导纳。Φ_P1为右端探头模态域矩阵，Z_P2为模态域右端探头阻抗矩阵，Y_P2为模态域右端探头导纳矩阵，

为右端探头耦合到平行双线上的共模阻抗，

为右端探头耦合到平行双线上的差模阻抗，

为右端探头耦合到平行双线上的共模导纳，

为右端探头耦合到平行双线上的差模导纳。Among them, Z _C is the modal domain matrix of the parallel two lines, Z _CM is the common mode characteristic impedance of the parallel two lines, Z _DM is the differential mode characteristic impedance of the parallel two lines, Φ _W(L1) is the parallel The two-wire transmission matrix, corresponding to the length of the parallel two-wire is L ₁ , Φ _W(L2) is the parallel two-wire transmission matrix under the modal domain from the right side of the left end probe to the left side of the right end probe, and the corresponding parallel two-line length is L ₂ , Φ _{W (L3)} is the parallel two-line transmission matrix under the right modal domain of the right-end probe, and the corresponding parallel two-line length is L ₃ , Φ _P1 is the modal domain matrix of the left-end probe, Z _P1 is the impedance matrix of the left-end probe in the modal domain, Y _P1 is the probe admittance matrix at the left end of the modal domain,

is the common-mode impedance of the left end probe coupled to the parallel pair of wires,

is the differential-mode impedance of the left-end probe coupled to the parallel pair of lines,

is the common-mode admittance of the left probe coupled to the parallel pair of lines,

is the differential-mode admittance of the left probe coupled to the parallel pair of lines. Φ _P1 is the modal domain matrix of the probe at the right end, Z _P2 is the impedance matrix of the probe at the right end of the modal domain, Y _P2 is the admittance matrix of the probe at the right end of the modal domain,

is the common-mode impedance of the right-hand probe coupled to the parallel pair of wires,

is the differential-mode impedance of the right-hand probe coupled to the parallel pair of lines,

is the common-mode admittance of the right-hand probe coupled to the parallel pair of wires,

is the differential-mode admittance of the right-hand probe coupled to the parallel pair of lines.

According to the link parameter calculation method, we can get

为模态域下注入法右端EUT的响应矩阵，

为模态域下注入法左端测试设备的响应矩阵，F_P1为左端探头源向量，V_S1为左端注入源向量，V_S1为左端注入探头加载到平行双线上的共模电压。F_P2为右端探头源向量，V_S2为右端注入源向量，V_S2为右端注入探头加载到平行双线上的共模电压。进一步得in,

is the response matrix of EUT at the right end of the injection method under the modal domain,

is the response matrix of the test equipment at the left end of the injection method under the modal domain, F _P1 is the source vector of the probe at the left end, V _S1 is the injection source vector at the left end, and V _S1 is the common-mode voltage loaded by the injection probe at the left end on the parallel double lines. F _P2 is the source vector of the probe at the right end, V _S2 is the injection source vector at the right end, and V _S2 is the common-mode voltage loaded by the injection probe at the right end onto the parallel double lines. get further

Next, the radiation time response is calculated. The radiation time test configuration is shown in Figure 11, and the corresponding network model is shown in Figure 12.

Available

in

Since the field line coupling process is a linear process, S ₁ and S ₂ have a linear relationship with the radiation field strength E, therefore, V _SL1 , V _SR1 , V _SL2 , V _SR2 , V _SL3 , V _SR3 have a linear relationship with the radiation field strength E .

Put formula (22) into (21) and expand to get

The relationship between radiation and terminal response during injection is analyzed below. Since the focus of attention is on the differential mode responses of the left and right terminals, it is necessary to satisfy that the differential mode responses of the left and right terminals are equal, that is

Under the above constraints, the relationship between the injection voltage and the equivalent voltage source during electromagnetic radiation can be obtained as

After calculation, it can be obtained that each k parameter in the above formula has no relationship with the equipment under test at the left and right ends, while V _SL1 , V _SR1 , V _SL2 , and V _SR2 are all linearly related to the field strength E. Therefore, it can be concluded that Conclusion: The radiation field strength E has a linear relationship with the equivalent injection voltages V _S1 and V _S2 , and the double-ended high current injection can achieve linear equivalent irradiation, and is not affected by the impedance parameters of the equipment under test at the left and right ends.

The above-mentioned embodiments are only preferred implementation modes of the present invention, so all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims (3)

1. double line equivalent strong field continuous wave radiation effect test method, it is characterized in that, described method comprises the steps: 1) Monitor the equipment at both ends of the cable. When the equipment at both ends of the cable has no monitorable output response, connect the photoelectric conversion device to the two terminals of the cable in parallel, and connect the output of the photoelectric conversion device to the receiver. For the cable If the output response of the equipment at both ends can be monitored, its output is connected to the receiver through the photoelectric conversion equipment; 2) Carry out the pre-injection test. For each test frequency point, adjust the position of the two injection probes on the cable, observe the change of the response size of the two terminal equipment with the injection position, give up the injection position with a small terminal response, and test the injection position on multiple terminals. Select one of the positions with the largest response, and do not move the injection probe after confirmation; 3) Carry out the low-field-strength electromagnetic radiation pre-test, and select the radiation field strength value E1 within the scope of the laboratory's electromagnetic environment simulation capability. Radiation field strength, if the output response of the equipment under test can be directly monitored, make the response of the equipment under test in the linear region, and then use a vector network analyzer to test the differential mode response amplitude and phase difference of the equipment at both ends; 4) Carry out an equivalent injection test, divide the output of the same signal source into two paths through a power divider, add an adjustable attenuator and an adjustable phase shifter on the two branches, and then connect the two paths of signals to two injection probes, Adjust the signal source, attenuator, and phase shifter so that the amplitude and phase difference of the two terminal responses are consistent with the radiation, and the injection source voltage U1 is obtained at this time, and the proportional coefficient k1=U1/ E1, multiple tests to obtain the average value of k1; 5) For the case where the response of the device under test cannot be directly monitored, at this time, the two ends of the cable are reconnected to the actual device under test. For the case where the response of the device under test can be directly monitored, the above reconnection steps are omitted to maintain the cable posture and The position of the injection probe remains unchanged, and the equivalent injection voltage value is calculated according to the field strength value E2 of the strong field radiation test. The attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged. The obtained results are equivalent to the strong field electromagnetic radiation test; The method employs the following system: The system includes a two-line radiation test configuration module when the terminal equipment response can be monitored, a two-line injection test configuration module when the terminal equipment response can be monitored, and a two-line low field strength radiation test configuration module and the terminal equipment when the terminal equipment response cannot be monitored. Equivalent low-field-strength radiation test configuration module for double-line injection when the response cannot be monitored; The two-wire radiation test configuration module when the response of the terminal equipment can be monitored includes a two-wire body composed of parallel wires or twisted pairs, and equipment arranged at both ends of the two-wire body. The output of the equipment is connected to an electro-optical conversion device. The electro-optical conversion equipment is connected to the photoelectric conversion equipment through optical fibers; the photoelectric conversion equipment is connected to the receiver; the two ends of the double-wire body are provided with injection probes, and the input port of the injection probe is connected to a matching load; the two-wire body A radiation excitation source is provided externally; The two-wire injection test configuration module when the response of the terminal equipment can be monitored includes a two-wire body, and devices arranged at both ends of the two-wire body, the output of the device is connected to an electro-optical conversion device, and the electro-optic conversion device is connected to the photoelectric conversion device through an optical fiber The photoelectric replacement device is connected to the receiver; the two ends of the double-wire body are provided with an injection probe, and the input port of the injection probe is connected to an injection excitation source; When the response of the terminal equipment cannot be monitored, the two-wire low-field radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optic conversion device The photoelectric conversion equipment is connected through an optical fiber; the photoelectric conversion equipment is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to a matching load; the outside of the double-wire body is provided with Radiation excitation source; When the response of the terminal equipment cannot be monitored, the double-wire injection equivalent low-field-strength radiation test configuration module includes a double-wire body, equipment arranged at both ends of the double-wire body, and electro-optical conversion equipment connected in parallel to both ends of the double-wire body. The electro-optical conversion device is connected to the photoelectric conversion device through an optical fiber; the photoelectric conversion device is connected to the receiver; injection probes are arranged at both ends of the double-wire body, and the input port of the injection probe is connected to an injection excitation source; The injection excitation source includes a signal source, the output of the signal source is connected to a power divider, and the output of the power divider is respectively connected to an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and adjustable attenuator The device is connected to two injection probes respectively. 2. The double-wire equivalent strong field continuous wave radiation effect test method according to claim 1, characterized in that: the radiation excitation source selects the radiation antenna position according to the test requirements of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, and the antenna is connected signal source and power amplifier. 3. the two-wire equivalent strong field continuous wave radiation effect test method according to claim 1, is characterized in that: the vector network analyzer is set at the receiver; the vector network analyzer is equipped with receiver mode and can A vector network analyzer that tests the phase difference between ports.

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