CN104683046B - A kind of analog receiver electromagnetic interference susceptibility test method and system - Google Patents
A kind of analog receiver electromagnetic interference susceptibility test method and system Download PDFInfo
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- CN104683046B CN104683046B CN201310624399.6A CN201310624399A CN104683046B CN 104683046 B CN104683046 B CN 104683046B CN 201310624399 A CN201310624399 A CN 201310624399A CN 104683046 B CN104683046 B CN 104683046B
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Abstract
The invention discloses a kind of analog receiver electromagnetic interference Susceptivity testing systems, it includes at least the signal source I and signal source II, signal source joint control circuit, combiner, audio analyzer for generating modulated-analog signal；Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer are connected respectively in 488 bus interface circuits of IEEE being connected with computer；Signal source joint control circuit is connected with signal source I and signal source II respectively, and signal source I and signal source II are connected with combiner.Signal source, combiner, audio analyzer etc. are integrated into a cabinet by the present invention, only stay two interfaces of output and input, this is for tested receiver, it is only necessary to connect two lines road can, thus connection becomes simpler；The setting of signal source joint control circuit can not only control one or more signal sources with synchronization, but also signal source joint control circuit is connected with 488 bus interface circuits of IEEE, it can be achieved that remote operation.
Description
Technical field
The present invention relates to a kind of radio system electromagnetic interference Susceptivity testing system more particularly to a kind of analog receivers
Electromagnetic interference susceptibility test method and system.
Background technology
With the development of wireless communication technique, the application of wireless telecom equipment greatly facilitates the production and life of people
It is living, but the type of wireless telecom equipment is various, model is different, thing followed electromagnetic interference EMI（Electronic
Magnetic Interference）Phenomenon also getting worse, and show with frequency equipment is more, covering bandwidth, frequency interleave weight
, easily there is the electromagnetism mutual interference between system, even results in communication disruption, system down, seriously affect nothing in folded serious feature
The overall efficiency of line electric system.Therefore, carrying out the research of radio system electromagnetic compatibility and electromagnetic interference susceptibility test has pole
For important meaning.
Carry out receiver electromagnetic susceptibility EMS（Electronic Magnetic Susceptibility）The purpose of test
Be obtain receiver susceptibility threshold, i.e., receiver by cisco unity malfunction after electromagnetic interference critical level.For tune
Width and frequency modulation etc. simulate the electromagnetic interference susceptibility test of radio system, and simulation is generated respectively using two-way or multipath signal source
Modulated signal generates the interfered signal in operation of receiver frequency range by combiner, detects receiver output signal-to-noise ratio；It adjusts
Signal source output signal level is saved, when receiver audio output reaches normal response, incoming signal level is critical level,
Reflect the electromagnetic interference sensibility of receiver, this grinds the electromagnetic compatibility of receiver performance characteristics analysis and radio system
Study carefully with important value.In existing analog receiver susceptibility test method, generally can only by manually selecting signal source,
In addition to this, existing test system connection is inconvenient, and the equipment such as two paths of signals source, combiner and audio analyzer are mutual indepedent,
The connection of test system is time-consuming and laborious；Moreover, during the test, need while adjusting the output of two signal sources very manually
Difficulty, testing efficiency are relatively low.
Invention content
The purpose of the present invention, which is that, provides a kind of analog receiver electromagnetic interference susceptibility test method and system, with solution
Certainly present in background technology can only be time-consuming and laborious by manually selecting signal source, test system connection is inconvenient, while manually
It is very difficult to adjust two signal sources, the relatively low problem of testing efficiency.
To achieve the above object, the present invention uses following technical scheme：
The present invention includes at least the signal source I for generating modulated-analog signal and signal source II, signal source joint control circuit, combining
Device, audio analyzer；Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer are connected respectively to and calculate
In the connected IEEE-488 bus interface circuit of machine；Signal source joint control circuit is connected with signal source I and signal source II respectively, signal
Source I and signal source II are connected with combiner；The signal source I, signal source II, signal source joint control circuit, combiner and audio
Analyzer is integrally disposed in cabinet.
The invention also includes filter/attenuator I and filter/attenuator II, signal source I and signal source II pass through respectively
Filter/attenuator I and filter/attenuator II are connected with combiner.
The signal source joint control circuit includes microprocessor, microprocessor respectively with Operation display module, with combiner phase
Signal source I even and signal source II, and the IEEE-488 bus interface adapter that is connected with IEEE-488 bus interface circuit.
The microprocessor is Motorola's MC68000 microprocessors.
The Operation display module include signal source state display, signal source selecting switch and signal source functional areas by
Key, signal source state display, signal source selecting switch and signal source functional areas button are connected with microprocessor respectively；The letter
Number source state display is dot matrix LED display screen.
It further includes signal source III and signal source IV, signal source joint control circuit respectively with IV phase of signal source III and signal source
Even, signal source III and signal source IV are connected with combiner.
It further includes filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator
IV, signal source I, signal source II, signal source III and signal source IV respectively by filter/attenuator I, filter/attenuator II,
Filter/attenuator III and filter/attenuator IV are connected with combiner.
A kind of test method using analog receiver electromagnetic interference Susceptivity testing system includes the following steps：
Step 1：By signal source joint control circuit selection signal source I, for output single channel modulated signal to combiner, combiner is defeated
The radiofrequency signal gone out is exported to tested receiver, tested receiver exports audio signal to audio analyzer, when audio signal reaches
When to normal response, the output power in tracer signal source I；
Step 2：Pass through signal source joint control circuit selection signal source II, output single channel modulated signal to combiner, combiner
The radiofrequency signal of output is exported to tested receiver, and tested receiver exports audio signal to audio analyzer works as audio signal
When reaching normal response, the output power in tracer signal source II；
Step 3：By signal source joint control circuit joint control signal source I and signal source II, useful signal or interference are simulated respectively
Signal is separately input into combiner, and combiner exports composite signal to tested receiver, and tested receiver exports audio signal is extremely
Audio analyzer, when audio signal reaches normal response, the critical output power in tracer signal source I and signal source II；
Step 4：According to measurement result, tested receiver electromagnetic interference susceptibility is calculated.
The invention also includes filter/attenuator I and filter/attenuator II, letters（Invention, novel same Times）Number source I
It is connected respectively with combiner by filter/attenuator I and filter/attenuator II with signal source II.
A kind of test method using analog receiver electromagnetic interference Susceptivity testing system includes the following steps：
Step 1：By signal source joint control circuit selection signal source I, signal source I export single channel modulated signal to filter/
Attenuator I, filter/attenuator I output signal to combiner, and the radiofrequency signal of combiner output is exported to tested receiver,
Tested receiver exports audio signal is to audio analyzer, when audio signal reaches normal response, the output in tracer signal source I
Power；
Step 2：By signal source joint control circuit selection signal source II, signal source II exports single channel modulated signal to filtering
Device/attenuator II, filter/attenuator II output signal to combiner, and the radiofrequency signal of combiner output, which is exported to tested, to be connect
Receipts machine, tested receiver exports audio signal to audio analyzer, when audio signal reaches normal response, tracer signal source II
Output power；
Step 3：By signal source joint control circuit joint control signal source I and signal source II, useful signal or interference are simulated respectively
Signal is separately input into filter/attenuator I and filter/attenuator II, filter/attenuator I and filter/attenuator
II outputs signal to combiner, and combiner exports composite signal to tested receiver, tested receiver exports audio signal to sound
Frequency division analyzer, when audio signal reaches normal response, the critical output power in tracer signal source I and signal source II；
Step 4：According to measurement result, tested receiver electromagnetic interference susceptibility is calculated.
Compared with prior art, signal source, combiner, audio analyzer etc. are integrated into a cabinet by the present invention, only
Stay output and input two interfaces, this is for tested receiver, it is only necessary to connect two lines road can, thus connect
Become simpler；The setting of signal source joint control circuit can not only control one or more signal sources with synchronization, Er Qiexin
Number source joint control circuit is connected with IEEE-488 bus interface circuit, and staff can be with remote operation；Sheet using the above scheme
Invention can be achieved to include that receiver is dry for co-channel interference, adjacent frequency interference, intermodulation to the content of analog receiver sensitivity test
It disturbs, Intermodulation Interference, block the susceptibility for interfering, being mixed interference and reciprocal mixing interference etc., can be suitably used for multiple analog receiver
The application scenario of electromagnetic susceptibility test, and with simple and easy to do, the convenient and efficient feature of test.
Description of the drawings
Fig. 1 is analog receiver electromagnetic interference Susceptivity testing system schematic diagram.
Fig. 2 is the structural schematic diagram of the signal source joint control circuit in the present invention.
Fig. 3 is analog receiver electromagnetic interference susceptibility test method flow diagram of the present invention.
Specific implementation mode
As shown in Figure 1, the present invention includes at least the signal source I for generating modulated-analog signal and signal source II, signal source connection
Control circuit, combiner, audio analyzer；Wherein signal source I, signal source II, signal source joint control circuit and audio analyzer difference
It is connected in the IEEE-488 bus interface circuit being connected with computer；Signal source joint control circuit respectively with signal source I and signal
Source II is connected, and signal source I and signal source II are connected with combiner.
Wherein, signal source I and signal source II are two signals with the multiband of identical working performance, more Modulation Types
Generator can generate frequency modulation（FM）, amplitude modulation（AM）The analog signal of equal Modulation Types, and there is larger output power range,
Such as power bracket is -130dBm ~ 20dBm.
Combiner is a kind of multiband combiner, and the output end of combiner is connected with tested receiver, tested receiver with
Audio analyzer is connected, and audio analyzer analysis has multi-frequency audio signal signal-to-noise ratio detection function, it can detect tested connect
The output signal-to-noise ratio of receipts machine.
As shown in Fig. 2, signal source joint control circuit of the present invention includes mainly microprocessor, signal source state display, signal
Source selecting switch, signal source functional areas button and IEEE-488 bus interface adapter.Wherein, signal source state display is used for
The output signal pattern of display source signal joint control state and signal source I and signal source II；Signal source selecting switch is realized to letter
Number source I's and signal source II individually controls or jointly controls；Signal source functional areas button realizes signal source I and signal source II outputs
The setting and adjusting of signal pattern；Microprocessor selects, is arranged for signal source, adjusting and the processing of Far end control signal,
Output control signals to signal source I and signal source II；IEEE-488 bus interface adapter is calculated for microprocessor and distal end
The transmitted in both directions of signal source state and computer instruction is realized in the conversion of machine signal.In a kind of typical signal source joint control circuit,
Microprocessor uses Motorola's MC68000 microprocessors, signal source state display to use dot matrix LED display screen.When need
When exporting one-channel signal, by signal source selecting switch selection signal source I or signal source II, sets and believe in signal source functional areas
The pattern and output power of number source I or signal source II；When needing while adjusting two paths of signals, selected by signal source selecting switch
The joint control pattern for selecting signal source I and signal source II concurrently sets and changes signal source I and II pattern of signal source and output power.
The present invention can also be by the system integration, by signal source I and signal source II, signal source joint control circuit, combiner, sound
Frequency division analyzer is integrally disposed in cabinet, builds Portable integrated analog receiver electromagnetic susceptibility test system platform.
As an improvement of the present invention：The invention also includes filter/attenuator I and filter/attenuator II, signal sources I
It is connected respectively with combiner by filter/attenuator I and filter/attenuator II with signal source II.When signal source I or signal
It, can be by filter/attenuator I or filter/attenuator II to signal source I or signal when the signal frequency that source II exports is excessive
The signal that source II exports is filtered and attenuation processing, obtains the analog signal for meeting tested receiver power and frequency range,
The case where to avoid signal source output power excessive damage tested receiver is caused because of maloperation.
As described in Figure 3, the step of test method of analog receiver electromagnetic interference Susceptivity testing system is：
Step 1：By signal source joint control circuit selection signal source I, signal source I export single channel modulated signal to filter/
Attenuator I, filter/attenuator I output signal to combiner, and the radiofrequency signal of combiner output is exported to tested receiver,
Tested receiver exports audio signal is to audio analyzer, when audio signal reaches normal response, the output in tracer signal source I
Power；
Step 2：By signal source joint control circuit selection signal source II, signal source II exports single channel modulated signal to filtering
Device/attenuator II, filter/attenuator II output signal to combiner, and the radiofrequency signal of combiner output, which is exported to tested, to be connect
Receipts machine, tested receiver exports audio signal to audio analyzer, when audio signal reaches normal response, tracer signal source II
Output power；
Step 3：By signal source joint control circuit joint control signal source I and signal source II, useful signal or interference are simulated respectively
Signal is separately input into filter/attenuator I and filter/attenuator II, filter/attenuator I and filter/attenuator
II outputs signal to combiner, and combiner exports composite signal to tested receiver, tested receiver exports audio signal to sound
Frequency division analyzer, when audio signal reaches normal response, the critical output power in tracer signal source I and signal source II；
Step 4：According to measurement result, tested receiver electromagnetic interference susceptibility is calculated.
As a further improvement on the present invention：The invention also includes signal source III and signal source IV, signal source joint control circuits
It is connected respectively with signal source III and signal source IV, signal source III and signal source IV are connected with combiner, can survey in this way
The susceptibility that amount tested receiver interferes multiple signals, increases test function.
The invention also includes filter/attenuator I, filter/attenuator II, filters, and/attenuator III and filter/declines
Subtract device IV, signal source I, signal source II, signal source III and signal source IV pass through filter/attenuator I, filter/decaying respectively
Device II, filter/attenuator III and filter/attenuator IV are connected with combiner.By filter/attenuator I, filter/
Attenuator II, filter/attenuator III and filter/attenuator IV are to signal source I, signal source II, signal source III and signal source
IV is filtered and attenuation processing, the analog signal for being suitble to input tested receiver is obtained, to avoid because of signal source I, signal source
II, the case where signal source III and signal source IV export signal power excessive damage tested receiver.
In order to better illustrate the test method of the present invention, below for measuring AM receiver third order intermodulation degree of suppression
It is illustrated：
Step 1：By signal source joint control circuit, it is zero to make the output of signal source II, and the Modulation Types in setting signal source I are
Amplitude modulation（AM）, the frequency in Regulate signal source I to tested receiver tuned frequency；
Step 2：The output power in Regulate signal source I makes tested receiver audio output reach normal response, tracer signal
The output power in source I；
Step 3：By signal source joint control circuit, it is zero to make the output of signal source I, and the Modulation Types in setting signal source II are
Amplitude modulation（AM）, the frequency in Regulate signal source II to tested receiver tuned frequency；
Step 4：The output power in Regulate signal source II makes tested receiver audio output reach normal response, record letter
The output power in number source II；
Step 5：The frequency in Regulate signal source I is, and, whereinFor the maximum bandwidth of tested receiver；
Step 6：The frequency in Regulate signal source II is, and, then have, i.e. signal source
I and the third order intermodulation of signal source II fall into the working band of tested receiver；
Step 7：By signal source joint control circuit, the output power in simultaneous equal Regulate signal source I and signal source II, until
Until there is normal response in tested receiver（Tested receiver audio Signal-to-Noise-and-distortion ratio SIAND）, record signal source I at this time and letter
The output power in number source II is respectivelyWith；
Step 8：Can by shutdown signal source I and signal source II, when judging that receiver responds, input signal whether be
Inter-modulated signal.Receiver is caused to produce normal response if it is inter-modulated signal, then calculating receiver third order intermodulation degree of suppression is：
Step 9：Return to step 1 changes tested receiver working frequency, when can measure different frequency, tested receiver
Third order intermodulation degree of suppression；
Step 10：Above-mentioned measuring process can be realized on far-end computer by IEEE-488 bus interface circuit, obtain
Degree of suppression result of calculation.
Because above-mentioned embodiment be only allow technical staff to be better understood from the present invention, therefore, the technical field of the invention
Technical staff can make an amendment or supplement or substitute by a similar method to described embodiment, such as increase multichannel letter
Number source（It is more than four tunnels）, the susceptibility that test receiver interferes multi signal without departing from the present invention or surmounts affiliated
Range defined in claim.
Claims (8)
1. a kind of analog receiver electromagnetic interference Susceptivity testing system, it is characterised in that：It, which is included at least, generates analog-modulated
The signal source I and signal source II of signal, signal source joint control circuit, combiner, audio analyzer；Wherein signal source I, signal source
II, signal source joint control circuit and audio analyzer are connected respectively in the IEEE-488 bus interface circuit being connected with computer；
Signal source joint control circuit is connected with signal source I and signal source II respectively, and signal source I and signal source II are connected with combiner；Institute
Signal source I, signal source II, signal source joint control circuit, combiner and audio analyzer is stated to be integrally disposed in cabinet；
Pass through signal source joint control circuit selection signal source I, output single channel modulated signal to combiner, the radio frequency letter of combiner output
Number output is to tested receiver, tested receiver exports audio signal to audio analyzer, when audio signal reaches normal response
When, the output power in tracer signal source I；
Pass through signal source joint control circuit selection signal source II, output single channel modulated signal to combiner, the radio frequency of combiner output
Signal is exported to tested receiver, tested receiver exports audio signal to audio analyzer, is rung when audio signal reaches standard
At once, the output power in tracer signal source II；
By signal source joint control circuit joint control signal source I and signal source II, useful signal or interference signal are simulated, combining is input to
Device, combiner export composite signal to tested receiver, tested receiver exports audio signal to audio analyzer, when audio is believed
When number reaching normal response, the critical output power in tracer signal source I and signal source II；
According to measurement result, tested receiver electromagnetic interference susceptibility is calculated.
2. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterised in that：It further includes
Filter/attenuator I and filter/attenuator II, signal source I and signal source II pass through filter/attenuator I and filtering respectively
Device/attenuator II is connected with combiner.
3. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterised in that：The signal
Source joint control circuit includes microprocessor, the signal source I and signal that microprocessor is connected with Operation display module, with combiner respectively
Source II, and the IEEE-488 bus interface adapter being connected with IEEE-488 bus interface circuit are connected.
4. analog receiver electromagnetic interference Susceptivity testing system according to claim 3, it is characterised in that：Micro- place
Reason device is Motorola's MC68000 microprocessors.
5. analog receiver electromagnetic interference Susceptivity testing system according to claim 3, it is characterised in that：The operation
Display module includes signal source state display, signal source selecting switch and signal source functional areas button, signal source status display
Screen, signal source selecting switch and signal source functional areas button are connected with microprocessor respectively；The signal source state display is
Dot matrix LED display screen.
6. analog receiver electromagnetic interference Susceptivity testing system according to claim 1, it is characterised in that：It further includes
Signal source III and signal source IV, signal source joint control circuit are connected with signal source III and signal source IV respectively, signal source III and signal
Source IV is connected with combiner.
7. analog receiver electromagnetic interference Susceptivity testing system according to claim 6, it is characterised in that：It further includes
Filter/attenuator I, filter/attenuator II, filter/attenuator III and filter/attenuator IV, signal source I, signal
Source II, signal source III and signal source IV pass through filter/attenuator I, filter/attenuator II, filter/attenuator III respectively
It is connected with combiner with filter/attenuator IV.
8. a kind of test method using analog receiver electromagnetic interference Susceptivity testing system as claimed in claim 7,
It is characterized in that, includes the following steps：
Step 1：By signal source joint control circuit selection signal source I, signal source I exports single channel modulated signal to filter/decaying
Device I, filter/attenuator I output signal to combiner, and the radiofrequency signal of combiner output is exported to tested receiver, is tested
Receiver exports audio signal is to audio analyzer, when audio signal reaches normal response, the output work in tracer signal source I
Rate；
Step 2：By signal source joint control circuit selection signal source II, the output single channel modulated signal of signal source II to filter/decline
Subtracting device II, filter/attenuator II outputs signal to combiner, and the radiofrequency signal of combiner output is exported to tested receiver,
Tested receiver exports audio signal is to audio analyzer, when audio signal reaches normal response, tracer signal source II it is defeated
Go out power；
Step 3：By signal source joint control circuit joint control signal source I and signal source II, useful signal or interference signal, input are simulated
To filter/attenuator I and filter/attenuator II, filter/attenuator I and filter/attenuator II output signal to conjunction
Road device, combiner export composite signal to tested receiver, and tested receiver exports audio signal to audio analyzer works as audio
When signal reaches normal response, the critical output power in tracer signal source I and signal source II；
Step 4：According to measurement result, tested receiver electromagnetic interference susceptibility is calculated.
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| CN106254009B (en) * | 2016-07-21 | 2018-08-03 | 北京航空航天大学 | A kind of Unmanned Aerial Vehicle Data Link test electromagnetic interference signal recurrence system and reproducing method |
| CN106646074A (en) * | 2017-03-07 | 2017-05-10 | 东南大学 | Modeling method of conducted electromagnetic interference receiver |
| CN107102216A (en) * | 2017-03-23 | 2017-08-29 | 北京中科国技信息系统有限公司 | Radiation immunity multisignal source measuring system and method |
| CN112415265B (en) * | 2020-09-04 | 2024-06-18 | 西安益翔航电科技有限公司 | System and method for testing radio frequency conduction sensitivity of redundancy |
| CN112637941B (en) * | 2020-12-16 | 2023-03-24 | 中电科航空电子有限公司 | Out-of-band radiation adjustment system and method for airborne electromagnetic wave equipment |
| CN113193927B (en) * | 2021-04-28 | 2022-09-23 | 中车青岛四方机车车辆股份有限公司 | Method and device for obtaining electromagnetic sensitivity index |
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