CN110161338B - Test method for electromagnetic compatibility time domain management between active and passive electronic systems - Google Patents
Test method for electromagnetic compatibility time domain management between active and passive electronic systems Download PDFInfo
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- CN110161338B CN110161338B CN201910465466.1A CN201910465466A CN110161338B CN 110161338 B CN110161338 B CN 110161338B CN 201910465466 A CN201910465466 A CN 201910465466A CN 110161338 B CN110161338 B CN 110161338B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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Abstract
The invention discloses a method for testing electromagnetic compatibility time domain management between active and passive electronic systems, which comprises the following steps: step 1) testing the correctness of the shadow signal at the output end of the shadow signal of the active transmitting equipment; step 2) leading out the intermediate frequency signal after down-conversion in a receiver of the passive receiving equipment, and accessing into a receiving channel of a dual-channel oscilloscope; leading out the received shadow signal from a shadow signal receiving port of the passive receiving equipment, and accessing the received shadow signal into the other receiving channel of the dual-channel oscilloscope; and 3) performing function verification of the secret shadow management based on the step 2). The method of the invention can make the masking management adopted when the interference exists between the large-scale platform active and passive electronic systems complete the function check and the flow verification in a faster and more accurate test mode; when a fault occurs, the problem location can be quickly completed according to the method.
Description
Technical Field
The invention relates to an electromagnetic compatibility testing technology, in particular to a testing method for electromagnetic compatibility time domain management between an active electronic system and a passive electronic system.
Background
Generally, a large number of radio frequency devices are arranged on a large platform, and comprise high-power active transmitting devices (such as radars and active transmitting electromagnetic waves), passive receiving devices (such as electronic reconnaissance devices and do not transmit electromagnetic waves), and the like, and the interference problem existing among the devices cannot be completely eliminated through the optimization of the spatial positions among the devices in the corresponding electromagnetic compatibility design. The interference problem between devices on a large platform is most prominent with the interference between an active transmitting device and a passive receiving device. Due to the equipment characteristics of the passive receiving equipment, the sensitive threshold is low, and the passive receiving equipment is easily subjected to electromagnetic interference of other equipment, so that the front-end amplifier of the receiver is saturated, the performance is degraded, and a front-end device is burned down more seriously.
Shadow management is a method frequently used on a large-scale platform, belongs to an electromagnetic compatibility management measure on a time domain, and is commonly used for eliminating the interference problem between active transmitting equipment and passive receiving equipment. The method is based on the principle that the duration (microsecond level) of the pulse transmitted by the active transmitting device is relatively short (small duty cycle) relative to the pulse period (millisecond level), namely the interval between two transmitted pulses is long, and the operation of the electronic reconnaissance device receiver is temporarily interrupted in the duration of the radar transmitted pulse, namely the electronic reconnaissance device receiver does not receive external signals. Overall, the concealment still keeps the observation of the receiver of the electronic spy equipment uninterrupted and without losing the signal. However, this causes problems of checking the functional validity of the shadow management and verifying the management flow.
In the actual test stage, the functional check and the process verification of the shadow management in the traditional electromagnetic compatibility test are mainly based on the judgment that the interference result of the active transmitting equipment is actually detected to disappear at the passive receiving equipment. If the shadow management effect is not obvious or invalid, the direct reason is that the receiving end of the active transmitting device, the shadow forwarding device or the passive reconnaissance device has a fault, and the method cannot quickly locate a fault point, so that the test progress is delayed. For this reason, new test methods need to be studied to circumvent the above problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a test method for electromagnetic compatibility time domain management between active and passive electronic systems aiming at the defects in the prior art, and when the electromagnetic compatibility time domain management between the active and passive electronic systems of a large-scale platform has problems, the rapid and accurate test problem positioning can be realized.
The technical scheme adopted by the invention for solving the technical problems is as follows: a test method for electromagnetic compatibility time domain management between active and passive electronic systems comprises the following steps:
step 1) testing the correctness of the shadow signal at the output end of the shadow signal of the active transmitting equipment;
the specific process of the step is as follows:
1.1) checking whether the polarity, the pulse width and the amplitude of a shadow signal at the active transmitting equipment meet the requirements of a relevant interface;
1.2) checking whether the time sequence relation between the synchronous signal and the shadow signal of the active transmitting equipment meets the design requirement of electromagnetic compatibility;
the method comprises the following specific steps:
introducing a synchronous signal and a shadow signal of the active transmitting equipment into a dual-channel oscilloscope, checking whether the time sequence relationship of the two meets the design requirement of electromagnetic compatibility, namely, checking the time sequence relationship of the two by comparing the two with the oscilloscope and taking the synchronous signal as a trigger signal: whether the leading edge of the concealment signal and the leading edge of the synchronization signal meet the requirement of advance agreement or not; checking whether the level amplitude of the image hiding signal meets the requirement of high level convention or not; checking whether the polarity of the masking signal meets the positive and negative polarity convention requirements;
setting the pre-lead of the image-hiding signal as the leading edge of the pulse of the image-hiding signal minus the leading edge of the pulse of the synchronous signal;
step 2), leading out the intermediate frequency signal after down-conversion in a receiver of the passive receiving equipment, and accessing into a receiving channel of a dual-channel oscilloscope; leading out the received shadow signal from a shadow signal receiving port of the passive receiving equipment, and accessing the received shadow signal into the other receiving channel of the dual-channel oscilloscope;
step 3), carrying out function verification of shading management on the basis of the step 2);
the specific process of the step is as follows:
3.1) at the passive receiving equipment, checking whether the amplitude and the signal rising time of the cloaking signal transmitted by the long-distance cable meet the requirements or not and whether the cloaking signal can be correctly identified and used by the passive receiving equipment or not;
and 3.2) checking the signal time sequence relation of the channel A and the channel B of the dual-channel oscilloscope, wherein at the moment, the high-level section of the hiding signal can completely contain an interference signal in the intermediate-frequency signal of the passive receiving equipment, the hiding signal is used as a trigger signal, whether the intermediate-frequency signal just falls into the high-level section of the hiding signal is checked, and the test of the electromagnetic compatibility time domain management between the large-scale platform active and passive electronic systems is completed by adjusting the widening of the front edge and the back edge of the high level of the hiding signal.
According to the scheme, the broadening of the front edge and the back edge of the high level of the hiding signal in the step 3.2) is adjusted as follows:
if the interference signal in the intermediate frequency signal stably appears outside the high level front edge of the image hiding signal, the image hiding signal lead of the active device is not enough, and the front edge of the high level of the image hiding signal is adjusted at the active device to adjust the image hiding signal lead;
if the interference signal in the intermediate frequency signal stably appears outside the high-level back edge of the image-hiding signal, the back edge of the image-hiding signal needs to be widened at the forwarding equipment;
and adjusting the lead amount and the trailing edge broadening of the artifact signal until an interference signal in the intermediate frequency signal completely falls into an artifact signal high-level interval, and considering that the lead amount and the trailing edge broadening amount of the artifact signal meet the requirements at the moment.
The invention has the following beneficial effects:
1) a test method for electromagnetic compatibility time domain management between large-scale platform active and passive electronic systems is established, so that the function check and flow verification can be completed in a faster and more accurate test mode by adopting shadow management when interference exists between the large-scale platform active and passive electronic systems; when a fault occurs, the problem location can be quickly completed according to the method.
2) Interference caused by multipath effect when the active transmitting equipment transmits can be accurately judged from the inside of the receiver, so that the accuracy of shadow management between the active electronic system and the passive electronic system of the large-scale platform is improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of an embodiment of a time domain management test for electromagnetic compatibility between active and passive electronic systems of a large platform;
FIG. 2 is a schematic diagram of an embodiment of a masking signal check test;
FIG. 3 is a block diagram of a security management function check according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in FIG. 1, a testing method for time domain management of electromagnetic compatibility between active and passive electronic systems of a large platform is provided, in order to improve the testing efficiency of time domain management of electromagnetic compatibility between active and passive electronic systems, reduce troubleshooting time when a failure problem occurs,
fig. 1 shows a schematic diagram of time domain management test for electromagnetic compatibility between active and passive electronic systems of a large platform, in which electromagnetic interference between the active and passive electronic systems of the large platform is mainly caused by electromagnetic waves emitted by an active device through an antenna, and the electromagnetic waves enter the antenna of a passive reconnaissance device through linear transmission or multipath transmission to cause interference of a receiving channel of the passive reconnaissance device. The electromagnetic compatibility time domain management between the active and passive electronic systems of the large-scale platform is a solution to the above interference problem, the active device generates a shadow signal in advance when transmitting electromagnetic waves, and sends the shadow signal to a special forwarding device through a low-loss cable for signal shaping and amplification, and then transfers the signal to the passive device, and the passive device closes a signal processing unit after receiving the shadow signal within a period of time when the level of the shadow signal is high, thereby realizing time-sharing work between the active and passive devices in the time domain and achieving the purpose of eliminating interference. From fig. 1, it can be seen that the testing of the time domain management of electromagnetic compatibility between the active and passive electronic systems of the large platform includes two parts, namely a transmitting end testing part and a receiving end testing part.
A test method for electromagnetic compatibility time domain management between active and passive electronic systems of a large-scale platform adopts the technical scheme that the test method is realized by the following test steps:
firstly, testing the correctness of an image hiding signal at an output end of an image hiding signal of active transmitting equipment;
the specific process of the step is as follows:
(1) checking whether the polarity, the pulse width and the amplitude of the shadow signal at the active transmitting equipment meet the requirements of a relevant interface;
(2) checking whether the time sequence relation between the synchronous signal and the shadow signal of the active transmitting equipment meets the design requirement of electromagnetic compatibility; and introducing a synchronous signal and an image hiding signal of the active transmitting equipment into a dual-channel oscilloscope, and checking whether the time sequence relation of the synchronous signal and the image hiding signal meets the design requirement of electromagnetic compatibility, wherein the image hiding signal lead is defined as the pulse leading edge of the image hiding signal minus the pulse leading edge of the synchronous signal.
As shown in fig. 2, the transmitting terminal tests the synchronous signal and the shadow signal of the active transmitting device at the same time mainly through a dual-channel oscilloscope, and checks the timing relationship between the synchronous signal and the shadow signal through comparison of the oscilloscopes, wherein the synchronous signal is used as a trigger signal at the moment, namely whether the leading edge of the shadow signal and the leading edge of the synchronous signal meet the requirement of the advance amount agreement or not; checking whether the level amplitude of the image hiding signal meets the requirement of high level convention or not; and checking whether the polarity of the masking signal meets the requirement of positive and negative polarity convention.
Step two, leading out the intermediate frequency signal after down-conversion in the passive receiving equipment receiver, and accessing into a receiving channel A of a dual-channel oscilloscope; the received shadow signal is led out from a shadow signal receiving port of the passive receiving equipment and is accessed to the other receiving channel B of the dual-channel oscilloscope.
Thirdly, verifying the function of the shading management on the basis of the second step;
the specific process of the step is as follows:
(1) at the passive receiving equipment, checking whether the amplitude and the signal rising time of the shadow signal transmitted by the long-distance cable meet the requirements or not and whether the shadow signal can be correctly identified and used by the passive receiving equipment or not;
(2) the passive receiving device is affected by the emission of the external active transmitting device, wherein the frequency signal contains the electromagnetic signal of the active transmitting device. And checking the signal time sequence relation of the channel A and the channel B of the dual-channel oscilloscope, wherein the high-level section of the shadow signal should completely contain the interference signal in the intermediate-frequency signal of the passive receiving equipment. If the interference signal in the intermediate frequency signal stably appears outside the high level front edge of the image-hiding signal, the image-hiding signal of the active device is not enough in advance and needs to be adjusted at the active device; if the interference signal in the if signal appears steadily outside the high-level trailing edge of the decoy signal, the trailing edge spreading of the decoy signal needs to be performed at the repeater. And adjusting the lead amount and the trailing edge broadening of the artifact signal until an interference signal in the intermediate frequency signal completely falls into an artifact signal high-level interval, and considering that the lead amount and the trailing edge broadening amount of the artifact signal meet the requirements at the moment.
As shown in fig. 3, the receiver test is performed when the active device is powered and the passive device is working normally, and the shadow signal is transmitted through the low-loss cable connection. The testing method adopts a shadow signal (signal A for short) as the first path input of the dual-channel oscilloscope, simultaneously uses an intermediate frequency signal (signal B for short) as the second path input of the dual-channel oscilloscope at an intermediate frequency testing port after the down-conversion of a passive equipment receiver, uses the signal A as a trigger signal, checks whether the signal B just falls into a high level interval of the signal A, and completes the test of the electromagnetic compatibility time domain management between the large-scale platform active and passive electronic systems by adjusting the broadening of the front edge and the back edge of the high level of the signal A. Wherein the leading edge of the high level of the signal a is adjusted at the active device in fig. 1, and the trailing edge spreading of the high level is adjusted at the repeater device in fig. 1.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (1)
1. A test method for electromagnetic compatibility time domain management between active and passive electronic systems is characterized by comprising the following steps:
step 1) testing the correctness of the shadow signal at the output end of the shadow signal of the active transmitting equipment;
the specific process of the step is as follows:
1.1) checking whether the polarity, the pulse width and the amplitude of a shadow signal at the active transmitting equipment meet the requirements of a relevant interface;
1.2) checking whether the time sequence relation between the synchronous signal and the shadow signal of the active transmitting equipment meets the design requirement of electromagnetic compatibility;
the method comprises the following specific steps:
introducing a synchronous signal and a shadow signal of the active transmitting equipment into a dual-channel oscilloscope, checking whether the time sequence relationship of the two meets the design requirement of electromagnetic compatibility, namely, checking the time sequence relationship of the two by comparing the two with the oscilloscope and taking the synchronous signal as a trigger signal: whether the leading edge of the concealment signal and the leading edge of the synchronization signal meet the requirement of advance agreement or not; checking whether the level amplitude of the image hiding signal meets the requirement of high level convention or not; checking whether the polarity of the masking signal meets the positive and negative polarity convention requirements;
setting the pre-lead of the image-hiding signal as the leading edge of the pulse of the image-hiding signal minus the leading edge of the pulse of the synchronous signal;
step 2), leading out the intermediate frequency signal after down-conversion in a receiver of the passive receiving equipment, and accessing into a receiving channel of a dual-channel oscilloscope; leading out the received shadow signal from a shadow signal receiving port of the passive receiving equipment, and accessing the received shadow signal into the other receiving channel of the dual-channel oscilloscope;
step 3), carrying out function verification of shading management on the basis of the step 2);
the specific process of the step is as follows:
3.1) at the passive receiving equipment, checking whether the amplitude and the signal rising time of the cloaking signal transmitted by the long-distance cable meet the requirements or not and whether the cloaking signal can be correctly identified and used by the passive receiving equipment or not;
3.2) checking the signal time sequence relation of the channel A and the channel B of the dual-channel oscilloscope, wherein at the moment, a high-level section of the hiding signal can completely contain an interference signal in an intermediate-frequency signal of the passive receiving equipment, the hiding signal is taken as a trigger signal, whether the intermediate-frequency signal just falls into the high-level section of the hiding signal is checked, and the test of the electromagnetic compatibility time domain management between the large-scale platform active and passive electronic systems is completed by adjusting the widening of the front edge and the back edge of the high level of the hiding signal;
the broadening of the front edge and the back edge of the high level of the hiding signal in the step 3.2) is adjusted as follows:
if the interference signal in the intermediate frequency signal stably appears outside the high level front edge of the image hiding signal, the image hiding signal lead of the active device is not enough, and the front edge of the high level of the image hiding signal is adjusted at the active device to adjust the image hiding signal lead;
if the interference signal in the intermediate frequency signal stably appears outside the high-level back edge of the image-hiding signal, the back edge of the image-hiding signal needs to be widened at the forwarding equipment;
and adjusting the lead amount and the trailing edge broadening of the artifact signal until an interference signal in the intermediate frequency signal completely falls into an artifact signal high-level interval, and considering that the lead amount and the trailing edge broadening amount of the artifact signal meet the requirements at the moment.
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| CN110703213B (en) * | 2019-10-09 | 2021-12-21 | 中国舰船研究设计中心 | Radar interference environment equivalent physical simulation method and device |
| CN111337888B (en) * | 2020-04-13 | 2020-10-23 | 北京航天长征飞行器研究所 | Dense decoy jamming method, computer device and computer readable storage medium |
| CN112084294B (en) * | 2020-09-14 | 2022-07-26 | 重庆长安新能源汽车科技有限公司 | Whole vehicle electromagnetic compatibility grading management method based on artificial intelligence |
| CN112418309B (en) * | 2020-11-20 | 2022-06-03 | 中国舰船研究设计中心 | Electromagnetic compatibility management and control method prediction method based on machine learning |
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