CN112327060A - Double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and system - Google Patents
Double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and system Download PDFInfo
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Abstract
The invention discloses a double-line equivalent strong field continuous wave radiation effect test, which comprises the following steps: 1) monitoring equipment at two ends of a cable, 2) carrying out an injection pre-test, 3) carrying out a low-field-intensity electromagnetic radiation pre-test, 4) carrying out an equivalent injection test, and 5) enabling the result obtained by the injection test to be equivalent to the high-field electromagnetic radiation test; the corresponding system of the method comprises a configuration module for a double-line radiation test and a double-line injection test when the terminal equipment responds to the monitoring, and a configuration module for a double-line low-field-intensity radiation test and a double-line injection equivalent low-field-intensity radiation test when the terminal equipment responds to the non-monitoring; the invention relates to a double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and a system, which mainly aim at an interconnection system with interconnection cables being parallel lines or twisted pairs.
Description
Technical Field
The invention relates to a continuous wave electromagnetic radiation effect test method, in particular to a double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and a system, belonging to the technical field of electromagnetic radiation effect tests.
Background
Along with the development of scientific technology, frequency utilization equipment in various fields is increased continuously, wherein high-power frequency utilization equipment is not lacked, and particularly in the military field, the electromagnetic environment of the equipment is severe along with the use of strong electromagnetic pulse weapons and high-power frequency utilization equipment; such High Intensity Radiation Field (HIRF) interference may not allow the device to maintain normal operation, but it may cause hard damage or even rejection of the device; therefore, it is becoming more and more urgent to evaluate the safety performance of the equipment by performing the electromagnetic radiation effect test on the equipment; the requirement of current electromagnetic compatibility on electromagnetic radiation sensitivity field strength test standards is continuously improved, and GJB1389A-2005 indicates that the peak field strength of severe electromagnetic environments faced by land-force helicopters can reach 27460V/m within a frequency band of 2.7-3.6 GHz, and the peak field strength exceeds 2000V/m under most frequency bands; generally, the electromagnetic interference coupling channel of the weapon equipment mainly comprises: antennas, cables, apertures, shield transmissions, and the like; at present, advanced weapon systems in various countries tend to be integrated and complicated in function, various electronic devices are distributed inside the weapon systems, and information transmission or power transmission is realized among the devices or subsystems through cable interconnection; the dependence of the interconnection system on the cable causes the cable coupling channel to become one of weak links of electromagnetic protection of the interconnection system; therefore, whether electromagnetic interference caused by coupling of the interconnection cable causes electromagnetic effect or not must be evaluated in advance through a strong-field electromagnetic environment effect test; however, due to the limitations of the conventional full-level electromagnetic radiation testing method, it is not practical to simulate such a high-field electromagnetic environment under the current laboratory conditions, and the simulation in a large space range is difficult to realize; how to deal with the contradiction between the electromagnetic environment simulation condition of the laboratory and the electromagnetic compatibility test requirement is the important factor in the electromagnetic radiation effect test research; under the background, a method of replacing radiation sensitivity by current injection is developed and gradually applied and developed in a plurality of fields; however, the current injection method is mainly used for the conducted sensitivity test, and the research for the equivalent radiation sensitivity test is relatively less; the current injection method mainly includes a large current injection (BCI) method, a Direct Current Injection (DCI) method, a Pulse Current Injection (PCI) method, and the like; BCI is a common mode injection method using a ferrite injection probe, interference signals are firstly coupled to an interconnection cable through the injection probe and further coupled to EUT of a cable terminal in a conduction mode; BCI has found wide acceptance as a conducted sensitivity test method, particularly in the military and automotive industry fields; the American aerospace test Standard SAEARP5583 provides a series of test methods for carrying out high-intensity radiation field electromagnetic safety verification on airplanes; aiming at the condition that the cable is a coupling path, a large current injection method (BCI) is adopted to carry out an equivalent test; the current injection method has the advantages of high efficiency, good repeatability and the like, and has high engineering application value under certain limiting conditions; however, this method has its own problems, the most important of which is that in the case of non-linear response of the Equipment Under Test (EUT), the use of a method that linearly extrapolates the relationship between the radiation field strength and the cable induced current may cause a large error in the experiment; typically, in tests where BCI is used for radiosensitivity assessment, only one BCI injection probe is typically used on the same interconnecting cable; the test configuration is suitable for the condition that only one end of the interconnected cable is connected with the EUT, the other end of the cable is connected with auxiliary equipment, and the electromagnetic sensitivity of the cable is generally not required to be checked; however, sometimes the electromagnetic sensitivity of the devices at two ends of the cable needs to be checked at the same time, and at this time, if only one injection probe is used, it is impossible to ensure that the responses of the devices to be tested at two ends are consistent with those of the radiation test under the common conditions; to solve this problem, sergio pignai et al propose a double-ended high current injection technique; according to the technology, two ends of a cable are respectively connected with an injection probe, and the response of equipment at the two ends of the cable can be ensured to be consistent with the radiation time by controlling the amplitude and the phase difference of two injection voltage sources; the method obtains the injection source parameters through calculation, so that the accuracy of the test result depends on whether the relevant system parameter values can be accurately obtained in advance or not to a great extent, and the parameters are difficult to accurately obtain in engineering tests; in addition, the existing double-end heavy current injection technology still does not consider how to realize the equivalence of strong electric field radiation effect tests under the condition that equipment at two ends generates nonlinear response; the parallel double lines and the twisted pair lines are commonly used cables in engineering, and how to carry out a large-current injection equivalent strong field radiation effect test on a double-line interconnection system with nonlinear equipment at two ends is a key technical problem to be solved.
Disclosure of Invention
In order to solve the problems, the invention provides a double-line double-end large-current injection equivalent strong-field continuous wave radiation effect test and a system, which are mainly used for an interconnection system with interconnection cables being parallel lines or twisted pairs.
The invention discloses a double-line equivalent strong-field continuous wave electromagnetic radiation effect test, which comprises the following steps:
1) monitoring equipment at two ends of a cable, connecting photoelectric conversion equipment in parallel to two terminals of the cable when the equipment at the two ends of the cable does not have a condition of output response capable of being monitored, connecting the output of the photoelectric conversion equipment to a receiver, and connecting the output of the photoelectric conversion equipment to the receiver through the photoelectric conversion equipment when the equipment at the two ends of the cable does not have the condition of output response capable of being monitored;
2) an injection pre-test is carried out, and for each test frequency point, the positions of two injection probes on the cable are adjusted to achieve the maximization of injection efficiency;
3) carrying out a low-field-intensity electromagnetic radiation pre-test, selecting a proper radiation field intensity value E1 to enable the response of the tested equipment to be in a linear region and the response amplitude to be accurately monitored, and then, respectively testing the differential mode response amplitude and the phase difference of the equipment at two ends by using a vector network analyzer;
4) carrying out an equivalent injection test, dividing the output of the same signal source into two paths through a power divider, adding an adjustable attenuator and an adjustable phase shifter on the two paths respectively, then connecting the two paths of signals into two injection probes, adjusting the signal source, the attenuator and the phase shifter to enable the response amplitude and phase difference of the two terminals to be correspondingly consistent with those during radiation, obtaining the injection source voltage U1 at the moment, obtaining the proportional coefficient k1 of the field intensity and the equivalent injection voltage to be U1/E1, and obtaining the average value of k1 through multiple tests;
5) for the condition that the response of the tested equipment cannot be directly monitored, the two ends of the cable are connected with the actual tested equipment, and for the condition that the response of the tested equipment can be directly monitored, the connection changing step is omitted, the posture of the cable and the position of the injection probe are kept unchanged, the field intensity value E2 of the strong field radiation test is carried out as required, the equivalent injection voltage value is obtained through calculation, the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged, and the result obtained through the injection test is equivalent to the strong field electromagnetic radiation test.
A double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and a system thereof are disclosed, the system comprises a double-line radiation test configuration module when the terminal equipment responds to monitoring, a double-line injection test configuration module when the terminal equipment responds to monitoring, a double-line low field intensity radiation test configuration module when the terminal equipment responds to non-monitoring and a double-line injection equivalent low field intensity radiation test configuration module when the terminal equipment responds to non-monitoring;
the double-line radiation test configuration module comprises a double-line body and devices arranged at two ends of the double-line body when the terminal device responds to the monitoring state, wherein the output of the devices is connected with an electro-optical conversion device, and the electro-optical conversion device is connected with the photoelectric conversion device through an optical fiber; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body; for the condition that the output response is not monitored, the equivalent relation of the field intensity and the injection voltage is measured under the condition that the two ends of the cable are connected with the photoelectric receiver in parallel, and when the two ends of the cable are connected with actual tested equipment in a changing way, the equivalent relation of the field intensity and the injection voltage is unchanged; during a low-field-intensity electromagnetic radiation test, the two-wire interconnection system is placed in an anechoic chamber or an open field environment, a large-current injection probe is respectively connected to appropriate positions on two sides of a cable, and an input port of the probe is connected with a matched load; selecting a radiation antenna position according to the test requirement of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, wherein the antenna is connected with a signal source and a power amplifier; using a vector network analyzer which has a receiver mode and can test the phase difference between ports to test the response amplitude and the phase difference of the two terminals; during injection test, the positions of the two injection probes are unchanged, the ports of the two injection probes are connected with injection sources, the output of the same signal source is divided into two paths through a power divider, the two paths are respectively connected with an adjustable attenuator and an adjustable phase shifter, and the amplitude and the phase difference of the response of the two terminals are tested by using the vector network analyzer;
the double-line injection test configuration module comprises a double-line body and devices arranged at two ends of the double-line body when the terminal device responds to the monitoring, wherein the output of the devices is connected with an electro-optical conversion device, and the electro-optical conversion device is connected with the photoelectric conversion device through an optical fiber; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the double-wire low-field-intensity radiation test configuration module comprises a double-wire body, devices arranged at two ends of the double-wire body and electro-optical conversion devices connected in parallel to two ends of the double-wire body, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body;
the double-line injection equivalent low-field-intensity radiation test configuration module comprises a double-line body, devices arranged at two ends of the double-line body and electro-optical conversion devices connected in parallel to two ends of the double-line body when the terminal device responses to the unmonitorable condition, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the injection excitation source comprises a signal source, the output of the signal source is connected to a power divider, the output of the power divider is respectively connected with an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and the adjustable attenuator are respectively connected with two injection probes.
Furthermore, the radiation excitation source selects the position of a radiation antenna according to the test requirement of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, and the antenna is connected with a signal source and a power amplifier.
Further, a vector network analyzer is arranged at the receiver; the vector network analyzer is provided with a receiver mode and can test phase difference between ports.
Compared with the prior art, the double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and system have the following advantages:
1. by the injection method, the equivalence of the strong-field electromagnetic radiation test can be realized under the condition that the response at the two ends of the cable is nonlinear, and the limitation of the prior art method is solved.
2. By selecting the high-current injection probe with the available upper limit frequency of more than 400MHz, the limitation that the existing high-current injection method is applied to the frequency below 400MHz can be broken through, and a technical means is provided for the effect examination of the high-field electromagnetic environment of the high-speed cable interconnection system.
Drawings
Fig. 1 is a schematic view of a radiation test configuration of a two-wire interconnection system when the response of the terminal device of the present invention can be monitored.
Fig. 2 is a schematic diagram of an injection test configuration of a two-wire interconnect system when the response of the terminal equipment can be monitored according to the present invention.
FIG. 3 is a schematic diagram of a low field intensity radiation test configuration of a two-wire interconnect system when the response of the terminal device is not monitorable.
Fig. 4 is a schematic diagram of an injection equivalent low field radiation test configuration of a two-wire interconnection system when the response of the terminal device is not monitorable.
Fig. 5 is a schematic diagram of an injection equivalent strong field radiation test configuration of a two-wire interconnection system when the response of the terminal device is not monitorable.
FIG. 6 is a block diagram of an electromagnetic radiation effect test configuration of a tested two-wire interconnect system of the present invention.
FIG. 7 is a block diagram of an equivalent injection test configuration for a tested two-wire interconnect system of the present invention.
FIG. 8 is a diagram of the test results of the double-end high-current injection equivalent high-field electromagnetic radiation test of the parallel two-wire interconnection system of the invention.
FIG. 9 is a schematic diagram of a test configuration during double-ended high-current co-injection according to the present invention.
FIG. 10 is a schematic diagram of an equivalent network model for dual injection according to the present invention.
FIG. 11 is a schematic diagram of an electromagnetic radiation testing arrangement of the present invention.
FIG. 12 is a schematic diagram of an equivalent network model during electromagnetic radiation according to the present invention.
Detailed Description
Example 1:
as shown in fig. 1 to 7, a two-wire two-end high current injection equivalent strong field continuous wave radiation effect test and system, the method includes the following steps:
1) monitoring equipment at two ends of a cable, connecting photoelectric conversion equipment in parallel to two terminals of the cable when the equipment at the two ends of the cable does not have a condition of output response capable of being monitored, connecting the output of the photoelectric conversion equipment to a receiver, and connecting the output of the photoelectric conversion equipment to the receiver through the photoelectric conversion equipment when the equipment at the two ends of the cable does not have the condition of output response capable of being monitored;
2) an injection pre-test is carried out, and for each test frequency point, the positions of two injection probes on the cable are adjusted to achieve the maximization of injection efficiency;
3) carrying out a low-field-intensity electromagnetic radiation pre-test, selecting a proper radiation field intensity value E1 to enable the response of the tested equipment to be in a linear region and the response amplitude to be accurately monitored, and then, respectively testing the differential mode response amplitude and the phase difference of the equipment at two ends by using a vector network analyzer;
4) carrying out an equivalent injection test, dividing the output of the same signal source into two paths through a power divider, adding an adjustable attenuator and an adjustable phase shifter on the two paths respectively, then connecting the two paths of signals into two injection probes, adjusting the signal source, the attenuator and the phase shifter to enable the response amplitude and phase difference of the two terminals to be correspondingly consistent with those during radiation, obtaining the injection source voltage U1 at the moment, obtaining the proportional coefficient k1 of the field intensity and the equivalent injection voltage to be U1/E1, and obtaining the average value of k1 through multiple tests;
5) for the condition that the response of the tested equipment cannot be directly monitored, the two ends of the cable are connected with the actual tested equipment, and for the condition that the response of the tested equipment can be directly monitored, the connection changing step is omitted, the posture of the cable and the position of the injection probe are kept unchanged, the field intensity value E2 of the strong field radiation test is carried out as required, the equivalent injection voltage value is obtained through calculation, the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged, and the result obtained through the injection test is equivalent to the strong field electromagnetic radiation test.
A double-line double-end heavy current injection equivalent strong field continuous wave radiation effect test and a system thereof are disclosed, the system comprises a double-line radiation test configuration module when the terminal equipment responds to monitoring, a double-line injection test configuration module when the terminal equipment responds to monitoring, a double-line low field intensity radiation test configuration module when the terminal equipment responds to non-monitoring and a double-line injection equivalent low field intensity radiation test configuration module when the terminal equipment responds to non-monitoring;
the double-line radiation test configuration module comprises a double-line body and devices arranged at two ends of the double-line body when the terminal device responds to the monitoring state, wherein the output of the devices is connected with an electro-optical conversion device, and the electro-optical conversion device is connected with the photoelectric conversion device through an optical fiber; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body; for the condition that the output response is not monitored, the equivalent relation of the field intensity and the injection voltage is measured under the condition that the two ends of the cable are connected with the photoelectric receiver in parallel, and when the two ends of the cable are connected with actual tested equipment in a changing way, the equivalent relation of the field intensity and the injection voltage is unchanged; during a low-field-intensity electromagnetic radiation test, the two-wire interconnection system is placed in an anechoic chamber or an open field environment, a large-current injection probe is respectively connected to appropriate positions on two sides of a cable, and an input port of the probe is connected with a matched load; selecting a radiation antenna position according to the test requirement of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, wherein the antenna is connected with a signal source and a power amplifier; using a vector network analyzer which has a receiver mode and can test the phase difference between ports to test the response amplitude and the phase difference of the two terminals; during injection test, the positions of the two injection probes are unchanged, the ports of the two injection probes are connected with injection sources, the output of the same signal source is divided into two paths through a power divider, the two paths are respectively connected with an adjustable attenuator and an adjustable phase shifter, and the amplitude and the phase difference of the response of the two terminals are tested by using the vector network analyzer;
the double-line injection test configuration module comprises a double-line body and devices arranged at two ends of the double-line body when the terminal device responds to the monitoring, wherein the output of the devices is connected with an electro-optical conversion device, and the electro-optical conversion device is connected with the photoelectric conversion device through an optical fiber; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the double-wire low-field-intensity radiation test configuration module comprises a double-wire body, devices arranged at two ends of the double-wire body and electro-optical conversion devices connected in parallel to two ends of the double-wire body, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body;
the double-line injection equivalent low-field-intensity radiation test configuration module comprises a double-line body, devices arranged at two ends of the double-line body and electro-optical conversion devices connected in parallel to two ends of the double-line body when the terminal device responses to the unmonitorable condition, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the injection excitation source comprises a signal source, the output of the signal source is connected to a power divider, the output of the power divider is respectively connected with an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and the adjustable attenuator are respectively connected with two injection probes.
The radiation excitation source selects the position of a radiation antenna according to the test requirement of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, and the antenna is connected with a signal source and a power amplifier. A vector network analyzer is arranged at the receiver; the vector network analyzer is provided with a receiver mode and can test phase difference between ports.
Example 2:
the effectiveness of the test method is verified by taking a parallel two-wire interconnection system as an example, and in order to verify the accuracy of the test method under the condition that the impedance of equipment ports at two ends of a cable is obviously changed, the test is carried out by adopting a mode of artificially changing the impedance of tested equipment, which is specifically as follows: the through type loads are used as test equipment for two end ends of the cable, the through type loads with different resistance values are connected to the two ends of the cable during high and low field intensity radiation tests, and the impedance change condition of the port of the test equipment during high field intensity electromagnetic radiation tests is simulated;
as shown in fig. 6 and 7; the method comprises the following steps of selecting a case that a tested device does not have output response which can be conveniently monitored for verification, carrying out a test in a anechoic chamber, dividing the same signal source output into two paths through a power divider in order to ensure that the frequencies of injection signals at two ends are completely consistent, adding an adjustable attenuator and an adjustable phase shifter on the two paths respectively, and then connecting the two paths of signals into two injection probes; the response of equipment at two ends of the cable is connected to the outside of the anechoic chamber through a photoelectric conversion device for measurement;
the test method comprises the following steps:
1) for a certain test frequency, firstly, carrying out a current injection pre-test, and adjusting the position of an injection probe on a cable to avoid the over-low injection efficiency;
2) developing a low-field electromagnetic radiation pre-test, selecting a proper radiation field intensity value E1 to ensure that the response of the tested equipment can be accurately monitored, and respectively testing the response amplitude and the phase difference of the equipment at two ends by using a vector network analyzer;
3) carrying out an equivalent injection test, adjusting a signal source, an attenuator and a phase shifter to enable the amplitude and the phase difference of the response of the two terminals to be correspondingly consistent with those of radiation, obtaining the current injection source voltage U1, obtaining a proportional coefficient k1 of the field intensity and the equivalent injection voltage U1/E1, and obtaining the average value of k1 through multiple tests;
4) the two ends of the cable are connected with passing loads with different resistance values, the posture of the cable and the position of an injection probe are kept unchanged, a field intensity value E2 of a strong field radiation test is carried out according to needs, the E2 is increased by 10dB compared with the E1, an equivalent injection voltage value is obtained through calculation, the attenuation multiple of an adjustable attenuator and the phase shift value of an adjustable phase shifter are unchanged, and two-end response obtained through the equivalent injection test of electromagnetic radiation is obtained;
5) connecting the two ends of the cable with passing loads with different resistance values again, keeping the posture of the cable and the position of the injection probe unchanged, developing a field intensity value E3 of a strong field radiation test according to needs, increasing the E3 by 10dB compared with E2, calculating to obtain an equivalent injection voltage value, keeping the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter unchanged, and obtaining two-end response obtained by the equivalent injection test of electromagnetic radiation;
because each injection source contributes to both end responses, the amplitude and phase of the output of the injection source need to be adjusted repeatedly for several times during injection test to ensure that the end responses are consistent with the radiation times.
The test result is shown in fig. 8, and it can be known from the test result that the test error is small, and the engineering test requirements can be met, and the error is mainly caused by:
1) in an equivalent injection test of low-field intensity radiation, the amplitude and the phase of two injection sources have deviation, so that the error of an extrapolation test is increased;
2) in the test process, the posture of the cable is inevitably changed to a certain extent, so that the equivalent relation between the field intensity and the injection voltage is changed, and the test error is increased.
The test result shows that the double-line equivalent strong-field continuous wave electromagnetic radiation effect test provided by the invention is effective and feasible.
When the tested devices at two ends of the cable are monitored to respond, if the two tested devices do not have output responses which can be monitored, the responses of the input ports of the two tested devices can be tested in a parallel connection mode, and because the equivalent relation between the radiation field intensity and the injection voltage is irrelevant to the characteristics of the tested devices at the two ends, the accuracy of the equivalent injection method cannot be influenced by the testing mode, and the testing method is verified as follows:
the experimental configuration for double-ended injection is shown in FIG. 9, and its equivalent simplified network model is shown in FIG. 10, similar to the single-ended injection method, resulting in
FP1＝(VS1-YP1·VS1)T (8)
FP2＝(VS2-YP2·VS2)T (9)
VS1＝VS1(1 0)T (15)
VS2＝VS2(1 0)T (16)
Wherein Z isCAs a matrix of parallel bi-linear modal domains, ZCMFor parallel two-wire common-mode characteristic impedance, ZDMFor parallel two-line differential mode characteristic impedance, phiW(L1)Is a parallel double-line transmission matrix under the left modal domain of a left-end probe, and the length of a corresponding parallel double line is L1，ΦW(L2)Is a parallel double-line transmission matrix under the modal domain from the right side of a left end probe to the left side of a right end probe, and the length of a corresponding parallel double line is L2，ΦW(L3)Is a parallel double-line transmission matrix under the right modal domain of the right-end probe, and the length of the corresponding parallel double line is L3，ΦP1Is a left-end probe modal domain matrix, ZP1Is a modal domain left end probe impedance matrix, YP1Is a modal domain left-end probe admittance matrix,
for the left-end probe to be coupled to a common mode impedance on the parallel twin wires,
for differential mode impedance coupling of the left-hand probe to the parallel twin lines,
for the left-end probe to be coupled to the common mode admittance on the parallel twin wires,
is a differential mode admittance with a left-hand probe coupled to parallel twin lines. PhiP1Is a right-hand probe modal domain matrix, ZP2Is a modal domain right-end probe impedance matrix, YP2Is a modal domain right-end probe admittance matrix,
for the right-hand probe to be coupled to the common mode impedance on the parallel twin wires,
the right-hand probe is coupled to differential mode impedance on the parallel two lines,
for the right-hand probe to be coupled to the common mode admittance on the parallel twin lines,
the right-hand probe is coupled to differential mode admittances on parallel twin lines.
According to the link parameter calculation method, the link parameter can be obtained
Wherein the content of the first and second substances,
for the response matrix of the EUT at the right end of the modal domain,
response matrix for left-end test equipment for modal-domain injection, FP1Is the source vector of the left probe, VS1For left-end injection of source vector, VS1The left-end injection probe is loaded with a common mode voltage on the parallel double lines. FP2Is the right-hand probe source vector, VS2Injecting a source vector, V, into the right endS2Common mode voltage applied to the parallel double lines for the right-hand injection probe. Further obtain
The responses at irradiation are calculated below, the experimental configuration at irradiation is shown in fig. 11, and the corresponding network model is shown in fig. 12.
Can obtain the product
Wherein
Since the field line coupling process is a linear process, S1、S2Linearly related to the radiation field strength E, and thus VSL1、VSR1、VSL2、VSR2、VSL3、VSR3Linearly with the radiation field strength E.
Bringing (21) the formula (22) in and unfolding it
The relationship between radiation and injected terminal response is analyzed below. Because the focus of attention is the differential mode response of the left terminal and the right terminal, the requirement that the differential mode responses of the left terminal and the right terminal are equal is met, namely
Under the constraint conditions, the relation between the injection voltage and the equivalent voltage source during electromagnetic radiation can be obtained as
Through calculation, each k parameter in the above formula has no relation with the tested equipment at the left and right ends, and VSL1，VSR1，VSL2，VSR2Both are linear with the field strength E, so that the conclusion can be drawn: radiation field intensity E and equivalent injection voltage VS1And VS2The linear relation is formed, the double-end heavy current injection can realize the linear equivalent irradiation, and is not influenced by the impedance parameters of the tested equipment at the left end and the right end.
The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.
Claims (4)
1. The double-line equivalent strong field continuous wave radiation effect test is characterized by comprising the following steps of:
1) monitoring equipment at two ends of a cable, connecting photoelectric conversion equipment in parallel to two terminals of the cable when the equipment at the two ends of the cable does not have a condition of output response capable of being monitored, connecting the output of the photoelectric conversion equipment to a receiver, and connecting the output of the photoelectric conversion equipment to the receiver through the photoelectric conversion equipment when the equipment at the two ends of the cable does not have the condition of output response capable of being monitored;
2) carrying out an injection pre-test, adjusting the positions of two injection probes on the cable for each test frequency point, observing the change condition of the response sizes of two terminal devices along with the injection positions, giving up the injection position with small terminal response, selecting one of the positions with large terminal response, and not moving the injection probes after determination;
3) carrying out a low-field-intensity electromagnetic radiation pre-test, selecting a radiation field intensity value E1 within the electromagnetic environment simulation capacity range of a laboratory, reducing the radiation field intensity as much as possible on the premise that the monitoring response of a tested device end can be accurately measured by using a receiver during selection, enabling the response of the tested device to be in a linear region if the output response of the tested device can be directly monitored, and then respectively testing the differential mode response amplitude and the phase difference of the devices at two ends by using a vector network analyzer;
4) carrying out an equivalent injection test, dividing the output of the same signal source into two paths through a power divider, adding an adjustable attenuator and an adjustable phase shifter on the two paths respectively, then connecting the two paths of signals into two injection probes, adjusting the signal source, the attenuator and the phase shifter to ensure that the response amplitude and the phase difference of the two terminals are correspondingly consistent with those during radiation, obtaining the injection source voltage U1 at the moment, obtaining the proportional coefficient k1= U1/E1 of the field intensity and the equivalent injection voltage, and obtaining the average value of k1 through multiple tests;
5) for the condition that the response of the tested equipment cannot be directly monitored, the two ends of the cable are connected with the actual tested equipment, and for the condition that the response of the tested equipment can be directly monitored, the connection changing step is omitted, the posture of the cable and the position of the injection probe are kept unchanged, the field intensity value E2 of the strong field radiation test is carried out as required, the equivalent injection voltage value is obtained through calculation, the attenuation multiple of the adjustable attenuator and the phase shift value of the adjustable phase shifter are unchanged, and the result obtained through the injection test is equivalent to the strong field electromagnetic radiation test.
2. The double-line heavy-current injection equivalent strong-field continuous wave radiation effect test system is characterized in that: the system comprises a terminal equipment response monitoring double-line radiation test configuration module, a terminal equipment response monitoring double-line injection test configuration module, a terminal equipment response non-monitoring double-line low field intensity radiation test configuration module and a terminal equipment response non-monitoring double-line injection equivalent low field intensity radiation test configuration module;
the double-line radiation test configuration module comprises a double-line body formed by parallel lines or twisted pairs and equipment arranged at two ends of the double-line body when the terminal equipment can monitor responses, wherein the output of the equipment is connected with electro-optical conversion equipment, and the electro-optical conversion equipment is connected with photoelectric conversion equipment through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body;
the double-line injection test configuration module comprises a double-line body and devices arranged at two ends of the double-line body when the terminal device responds to the monitoring, wherein the output of the devices is connected with an electro-optical conversion device, and the electro-optical conversion device is connected with the photoelectric conversion device through an optical fiber; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the double-wire low-field-intensity radiation test configuration module comprises a double-wire body, devices arranged at two ends of the double-wire body and electro-optical conversion devices connected in parallel to two ends of the double-wire body, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-line body, and input ports of the injection probes are connected with matched loads; a radiation excitation source is arranged outside the double-line body;
the double-line injection equivalent low-field-intensity radiation test configuration module comprises a double-line body, devices arranged at two ends of the double-line body and electro-optical conversion devices connected in parallel to two ends of the double-line body when the terminal device responses to the unmonitorable condition, wherein the electro-optical conversion devices are connected with the electro-optical conversion devices through optical fibers; the photoelectric conversion equipment is connected to a receiver; injection probes are arranged at two ends of the double-wire body, and input ports of the injection probes are connected with injection excitation sources;
the injection excitation source comprises a signal source, the output of the signal source is connected to a power divider, the output of the power divider is respectively connected with an adjustable phase shifter and an adjustable attenuator, and the adjustable phase shifter and the adjustable attenuator are respectively connected with two injection probes.
3. The test and system for the radiation effect of the double-wire double-end high-current injection equivalent strong-field continuous wave as claimed in claim 2, wherein: the radiation excitation source selects the position of a radiation antenna according to the test requirement of electromagnetic radiation sensitivity in the electromagnetic compatibility standard, and the antenna is connected with a signal source and a power amplifier.
4. The double-wire double-end large current injection equivalent strong field continuous wave radiation effect test and system according to claim 4, wherein: a vector network analyzer is arranged at the receiver; the vector network analyzer is provided with a receiver mode and can test phase difference between ports.
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