CN106027176B - Receiver in-band dual frequency electromagnetic radiation large signal blocking interference effect prediction method - Google Patents
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Abstract
The present invention discloses a receiver in-band dual frequency electromagnetic radiation large signal blocking interference effect prediction method, relating to the technical field of tests and evaluation of an electromagnetic environment effect. According to the method, an in-band dual frequency electromagnetic radiation large signal blocking interference effect prediction model is established through analysis of a receiver in-band large signal blocking interference mechanism, and a communication station large signal blocking interference effect test solution is designed with a certain mode of ultra-short wave communication station as a tested object. An electromagnetic radiation sensitivity change law of the tested station under the action of in-band dual frequency different weight combination is researched through station in-band single frequency and dual frequency continuous wave electromagnetic radiation large signal blocking interference effect tests. Test results show that coefficients of a dual frequency continuous wave electromagnetic radiation large signal blocking interference effect prediction model under different frequency combination and different power strength combination are all around 1, prediction errors are all within +/-3dB, and the effectiveness of the receiver in-band dual frequency continuous wave electromagnetic radiation large signal blocking interference effect prediction model is verified.
Description
Technical field
The present invention relates to electromagnetic environmental effects experiment and double frequency electricity in assessment technology field, more particularly to a kind of receiver band
Magnetic radiation strong signal blocking disturbing effect Forecasting Methodology.
Background technology
With continuing to develop for science and technology, it is continuously increased with frequency equipment, Battle Field Electromagnetic is increasingly complicated, outstanding behaviours
For radiation field intensity is high, multi radiation sources and deposit.It is objective existing that complex electromagnetic environment is equipment build-up and military struggle must be faced
It is real.Under complex electromagnetic environment, security and survival ability of the various electromagnetic environmental effects to equipping constitute very big
Influence.Therefore, the equipment Efficacy study on assessing method under complex electromagnetic environment, for the war preparedness under prediction complex electromagnetic environment
Overall support capability, raising equipment war preparedness serviceability rate and Mission Success rate have important value.
It should be noted that the radiosensitivity experiment of current electromagnetic compatibility standard defined both at home and abroad is in single radiation
Under the conditions of source carry out, experiment obtain interference, damage critical field strength can not represent Device under test in actual Battle Field Electromagnetic
Under survival ability, and under actual Battle Field Electromagnetic, with equip frequently the electromagnetic radiation source that faces it is crisscross on spatial domain,
It is random changeable in intensive overlap, efficiency on constant, frequency domain in time domain, that is to say, that what is faced in most cases is
The situation that multi-source is radiated simultaneously.In this case, if the radiation frequency of radiation source, polarised direction appropriate mix, having very much can
Signal equipment can be made to be interfered within the safe range of single source radiation effective matrix.In order to evaluate complicated electricity is equipped in frequency
Radiation effect under magnetic environment, typically can be using the half of laboratory electromagnetic environment simulation system in kind to carrying out phase with frequency equipment
The electromagnetic environmental effects answered are tested.But, Battle Field Electromagnetic is intricate, and environmental simulation is difficult to limit at all, for frequently
It is equipped in the situation of any multi-source radiating composite that may be faced on future battlefield, it is impossible to all by the environment in laboratory
Simulation and effect test method are tested and evaluated one by one.Therefore, it is necessary to being imitated with the multi-source electromagnetic radiation of frequency equipment
Forecasting Methodology is answered to be furtherd investigate.
At present, domestic and foreign scholars have realized that the deficiency of conventional radiation-sensitive degree experiment, and have carried out corresponding research.
Multiple Radio frequency interferences are had been used in the test of military aircraft and DTV receiver.Keith Armstrong analyze use
In the weak point of the electromagnetic compatibility test of automobile function safety simultaneously, it is indicated that do not account for what is occurred in electromagnetic compatibility test
Interference.Electromagnetic interference may occur simultaneously in actual electromagnetic environment, including two or more frequencies Radio frequency interference, one
Radiation interference is plus a Conduction Interference or electrostatic pulse etc..The multiple interference for occurring simultaneously can be produced by intermodulation or detection process
The new radio-frequency component of life, so as to produce interference to Device under test.Michel Mardiguian are pointed out by single-frequency susceptibility test
Equipment it is more sensitive to multiple interference signals for occurring simultaneously, although now the amplitude of each interference signal is quick less than single-frequency
Sensitivity threshold value.A.Duffy and A.Orlandi et al. use multi-source radiosensitivity experimental test intermodulation effect in reverberation chamber.
Werner Grommes et al. propose the susceptibility test method for intermodulation effect by the method for double source frequency sweep, but do not have
Related verification experimental verification.
The Cheng Erwei of domestic Ordnance Engineering College, State of Zhao's beam have studied electromagnetic radiation sensitivity rule under the conditions of multi-source continuous wave
Rule.Other researchs then mainly from macroscopic view, are considered in installation electromagnetical environmental effect factor is influenceed in complex electromagnetic environment
Interior, with statistical analysis techniques such as neutral net, chaos, fuzzy mathematicses, final assessment Device under test is under complex electromagnetic environment
Survival ability.
Receiver is equipped as typical battlefield with frequency, is to ensure information transmission between each combat unit and weaponry
Important tool and means, play very important effect in IT-based warfare, it is therefore necessary to receiver continuous wave electricity
Magnetic radiation strong signal blocking disturbing effect appraisal procedure is furtherd investigate.
The content of the invention
The technical problems to be solved by the invention are to provide double frequency electromagnetic radiation strong signal blocking in a kind of receiver band and do
Effect forecast method is disturbed, methods described passes through to set up with interior double frequency continuous-wave radiation strong signal blocking disturbing effect forecast model,
The prediction of electromagnetic radiation strong signal blocking disturbing effect is carried out to receiver, has the advantages that prediction accurately, easily and fast.
In order to solve the above technical problems, the technical solution used in the present invention is：Double frequency electromagnetism spoke in a kind of receiver band
Penetrate strong signal blocking disturbing effect Forecasting Methodology, it is characterised in that comprise the following steps：
If input signal is
U in formuladIt is interference signal, usIt is useful signal；
Input signal by being after limiter or bandpass filter：
B in formuladAnd BsRespectively limiter or wave filter are ω to frequencydAnd ωsThe amplitude-frequency coefficient of signal, BdAnd BsAll
It is constant；
After input signal enters receiver nonlinear device, relation between the input/output signal of nonlinear device can be with
Represented with power series：
Wherein uiIt is input signal, uoIt is output signal, An(n=0,1,2 ...) is relevant with system transfer characteristic normal
Number；
Obtained during formula (2) is substituted into formula (3)：
DC component is obtained after decomposition：
Fundametal compoment：
By formula (7) understand useful signal gain be：
Useful signal gain is under understanding mono-tone interference according to formula (8)：
Wherein, U'1、U'2It is two susceptibility thresholds of interference signal of different frequency, when receiver is subject to two sines
During the interference of continuous wave CO_2 laser signal, i.e., input signal is：
u1、u2It is two interference signals of different frequency, when receiver is subject to double frequency continuous wave CO_2 laser, by limiter
Or obtained after bandpass filter：
Formula (12) is updated in formula (3) and is obtained：
DC component is obtained after decomposition：
Fundametal compoment is：
Understand that useful signal gain is by formula (17)
When the strong signal blocking disturbing effect phenomenon that receiver occurs under different frequency, the effect of varying strength interference signal
When identical, i.e., useful signal gain size is identical, shows the interference signal of now different combinations to the generation of receiver
Influence degree is identical；Therefore, simultaneous formula (9) (10) (18) is obtained：
Then have：
Understand that sinusoidal continuous wave signal mean power is U by Paasche Wa Er identities2/ (2R), then above formula can be denoted as：
Wherein, S is effect forecast coefficient, P'1、P'2Respectively receiver is in single-frequency f1、f2Power under interference effect is quick
Sensitivity threshold value, P1、P2It is receiver in f1、f2Double frequency power combination simultaneously under interference effect；
Therefore, for two different frequencies sine continuous wave signals in the receiver pass-band that gives, if known its respective list
Solely strong signal blocking disturbing effect power susceptibility threshold value is respectively P' during radiation1、P'2, then when two frequency sine continuous waves are same
When acting on receiver, P1、P2Respectively with P'1、P'2Ratio sum S when reaching 1, receiver may produce corresponding big
Signal jam disturbing effect；Conversely, if S is less than 1, receiver is not in necessarily above-mentioned strong signal blocking disturbing effect.
Further technical scheme is：Under single-frequency continuous wave electromagnetic radiation, strong signal blocking interference effect is carried out
The test method answered is as follows：
Mono-tone interference signal is produced using signal source, by producing radiation field by log-periodic antenna after power amplification,
Transmitting station is arranged in radiation field and radio station is received, and attenuator is connected between transmitting station and radiating antenna, for mould
Intend decay of the telecommunication to signal between two radio station, receiving radio station side, connect between reception antenna and reception radio station
Directional couple device is connect, is connected to a signal transmission through fiber system by the detection port of directional couple device, and it is right by putting
Point signal transmission through fiber system connection spectrum analyzer, is monitored in distal end by spectrum analyzer and receives radio station main frame input port
The forward power at place；In test, transmitting station transmitting normal communications signal, log-periodic antenna produces interference radiation field docking
Receive radio station to be disturbed, observation receives the strong signal blocking disturbing effect phenomenon that radio station occurs, and is recorded by spectrum analyzer
Communication station strong signal blocking disturbing effect power susceptibility threshold value under single-frequency continuous wave electromagnetic radiation.
Further technical scheme is：The point-to-point signal transmission through fiber system includes electrical to optical converter, transmission light
Fine and optical-electrical converter, the electrical to optical converter is connected with one end of Transmission Fibers, and optical-electrical converter is another with Transmission Fibers
End connection.
Further technical scheme is：The experiment side of strong signal blocking disturbing effect is carried out under double frequency continuous wave CO_2 laser
Method is as follows：
Two signal sources each produce a mono-tone interference signal, are passed through two mono-tone interference signals using power combiner
Power combing is carried out, the interference signal of synthesis produces radiation field after amplifying through power amplifier by log-periodic antenna, in spoke
Penetrate in field and arrange transmitting station and receive radio station, and attenuator is connected between transmitting station and radiating antenna, for simulating two
Decay of the telecommunication to signal between individual radio station, is receiving radio station side, and connection is fixed between reception antenna and reception radio station
To coupling device, by the detection port tie point of directional couple device to a signal transmission through fiber system, and by point-to-point
Signal transmission through fiber system connects spectrum analyzer, is monitored in distal end by spectrum analyzer and received at the main frame input port of radio station
Forward power；In test, transmitting station transmitting normal communications signal, log-periodic antenna produces two mono-tone interference signals
The interference radiation field of synthesis, disturbs receiving radio station, changes different frequency and power combination is tested, and by frequency spectrum
Analyzer records the frequency and power of two mono-tone interference signals when strong signal blocking disturbing effect occurs in communication station, will survey
Double frequency electromagnetic radiation strong signal blocking interference in receiver band is verified in the formula of the result substitution effect forecast coefficient S of examination
The validity of effect forecast method.
Further technical scheme is：The point-to-point signal transmission through fiber system includes electrical to optical converter, transmission light
Fine and optical-electrical converter, the electrical to optical converter is connected with one end of Transmission Fibers, and optical-electrical converter is another with Transmission Fibers
End connection.
It is using the beneficial effect produced by above-mentioned technical proposal：Methods described hinders by big signal in receiver band
Plug disturbing effect Analysis on Mechanism, sets up with interior double frequency electromagnetic radiation strong signal blocking disturbing effect forecast model, and with ultrashort wave
Communication station is study subject, devises communication station strong signal blocking disturbing effect testing program.By in communication station band
Single-frequency and double frequency continuous wave strong signal blocking disturbing effect are tested, and be have studied the double frequency difference weight combination in band of tested radio station and are made
With lower electromagnetic radiation sensitivity Changing Pattern.Result of the test shows：Different frequency combination, the lower double frequency of different capacity intensity combination connect
Continuous ripple electromagnetic radiation strong signal blocking disturbing effect predictive coefficient S all 1 or so, all within ± 3dB, test predicated error by experiment
The validity with interior double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect forecast model is demonstrate,proved.It is continuous by double frequency in band
Ripple strong signal blocking disturbing effect forecast model, carries out strong signal blocking disturbing effect and is predicted, with prediction to receiver
Accurately, advantage easily and fast.
Brief description of the drawings
Fig. 1 is electromagnetic interference classification chart；
Fig. 2 is communication station single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect test configurations figure；
Communication station single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is sensitive when Fig. 3 working frequencies are 40MHz
Write music line chart；
Communication station single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is sensitive when Fig. 4 working frequencies are 60MHz
Write music line chart；
Communication station single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is sensitive when Fig. 5 working frequencies are 80MHz
Write music line chart；
Fig. 6 is communication station double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect test configurations figure；
First group of communication station double frequency continuous wave electromagnetic radiation strong signal blocking interference effect when Fig. 7 working frequencies are 40MHz
Answer sensitivity curve figure；
Communication station double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is sensitive when Fig. 8 working frequencies are 60MHz
Write music line chart；
Second group of communication station double frequency continuous wave electromagnetic radiation strong signal blocking interference effect when Fig. 9 working frequencies are 40MHz
Answer sensitivity curve figure；
Communication station double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is sensitive when Figure 10 working frequencies are 80MHz
Write music line chart.
Specific embodiment
With reference to the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Many details are elaborated in the following description in order to fully understand the present invention, but the present invention can be with
Other manner described here is different from using other to implement, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is not limited by following public specific embodiment.
It is described the invention discloses double frequency electromagnetic radiation strong signal blocking disturbing effect Forecasting Methodology in a kind of receiver band
The analysis process of method is as follows：
The sorting technique of electromagnetic interference of setting out from different angles is different, according to electronic system receiver to electromagnetic interference
Electromagnetic interference can be divided into linear disturbance and Nonlinear perturbations by response, and electromagnetic interference classification is as shown in Figure 1.Linear disturbance is usual
Disturbed including co-channel interference and adjacent frequency, now receiver is equivalent to bandpass filter.And common Nonlinear perturbations have intermodulation to do
Disturb, Intermodulation Interference, look genuine response etc., be all the non-linear generation due to electronic system.The definition for blocking interference has many kinds,
Broadly, due to the effect of interference signal, beyond the dynamic range of electronic device in electronic system, or electronics is changed
The biasing of device, so that the sensitivity of receiver declines, the significantly reduced phenomenon of gain of useful signal can be referred to as hindering
Plug interference.So above-mentioned several interference can also be divided into the category of obstruction interference.Band internal congestion for receiver is disturbed
The phenomenons such as intermodulation, intermodulation will not be produced, belongs to strong signal blocking interference.
Electromagnetic wave can all first pass through limiter or bandpass filter by the radio-frequency front-end that antenna is coupled into receiver,
Selection suppression is carried out to input signal, it is considered to which receiver is disturbed by a sinusoidal continuous wave CO_2 laser signal, i.e. input signal
For：
U in formuladIt is interference signal, usIt is useful signal.
Input signal by being after limiter or bandpass filter：
B in formuladAnd BsRespectively limiter or wave filter are ω to frequencydAnd ωsThe amplitude-frequency coefficient of signal, receiver
Most situations are all operated in the range of linearity in real electromagnetic environment, so here it is considered that BdAnd BsAll it is constant.
Then input signal enters in the nonlinear devices such as receiver low-noise amplifier and frequency mixer, by the basic of circuit
Knowledge understands that the relation between the input/output signal of general nonlinearity circuit can be represented with power series：
Wherein uiIt is input signal, uoIt is output signal, An(n=0,1,2 ...) is relevant with system transfer characteristic normal
Number.
Obtained during formula (2) is substituted into formula (3)：
DC component is obtained after decomposition
Fundametal compoment
Because harmonic component, intermodulation component and intermodulation component that generation is disturbed in band will not cause shadow to receiver substantially
Ring, just repeat no more herein.
If interference signal amplitude is sufficiently strong, by influenceing still very important after the passband of receiver, receiver output
Useful signal will reduce even disappear, this phenomenon be exactly strong signal blocking interference.The increasing of useful signal is understood by formula (7)
Benefit is
As can be seen here：(1) A is worked as3When=0, K=A1, now useful signal gain be constant, but in reality it is non-linear because
Sub- A3Negative generally is, so strong signal blocking effect is all due to A3Cause；(2) either useful signal is too strong still
Interference signal is too strong all to reduce gain coefficient K, whenWhen, K=0 shows that useful signal is complete
Full obstruction falls, and this is the mechanism of strong signal blocking interference in receiver band.
What the single-frequency susceptibility threshold equipped with frequency was to determine, but under Complicated Electromagnetic Environment in Battlefield, signal frequency is wrong
Comprehensive complicated, signal amplitude is overlapped mutually, and is likely to appear in the safe range that monofrequency radiation effect test is assessed with frequency equipment
There is electromagnetic interference.Because electromagnetic environment simulation is difficult to limit at all, for being equipped on future battlefield and may be faced with frequency
Any multi-source radiating composite situation, it is impossible to all carried out one by one by the environmental simulation and effect test method in laboratory
Test and evaluation.Therefore the present invention sets up double frequency in receiver band from the strong signal blocking disturbing effect mechanism of receiver
Continuous wave electromagnetic radiation strong signal blocking disturbing effect forecast model.
Useful signal gain is under understanding mono-tone interference according to formula (8)
U'1、U'2It is two amplitude thresholds of interference signal of different frequency.Consider that receiver is subject to two sinusoidal continuous waves
The interference of interference signal, i.e. input signal are：
u1、u2It is two interference signals of different frequency.When receiver is subject to double frequency continuous wave CO_2 laser, by limiter
Or obtained after bandpass filter frequency-selecting suppression：
Formula (12) is updated in formula (3) and is obtained
DC component is obtained after decomposition
Fundametal compoment is
Understand that useful signal gain is by formula (17)
When the strong signal blocking disturbing effect phenomenon that receiver occurs under different frequency, the effect of varying strength interference signal
When identical, i.e., useful signal gain size is identical, shows the interference signal of now different combinations to the generation of receiver
Influence degree is identical.Therefore, simultaneous formula (9) (10) (18) is obtained：
Then
Understand that sinusoidal continuous wave signal mean power is U by Paasche Wa Er identities2/ (2R), then above formula can be denoted as：
Wherein, S is effect forecast coefficient, P'1、P'2It is receiver in single-frequency f1、f2Power susceptibility under interference, P1、P2
It is receiver in f1、f2Power susceptibility double frequency is disturbed simultaneously under is combined；
Therefore, for two different frequencies sine continuous wave signals in the receiver pass-band that gives, if known its respective list
Solely strong signal blocking disturbing effect power susceptibility threshold value is respectively P' during radiation1、P'2, then when two frequency sine continuous waves
(power combination is P1、P2) while when acting on receiver, P1、P2Respectively with P'1、P'2Ratio sum S when reaching 1, receiver
May produce why corresponding strong signal blocking disturbing effect (says it is that, there may be interference, reason is given P1、P2Not
Must be the power in most sensitive polarised direction)；Conversely, if S is less than 1, receiver is not in necessarily above-mentioned strong signal blocking
Disturbing effect.
It is worth noting that, when the frequency of two interference signals is equal, and model above is not met, because two
After the sine-wave superimposed of same frequency, it is a sine wave signal to be considered as, and this amplitude and the size of power with signal
It is relevant with phase.
In order to verify the correctness of above-mentioned institute's established model, the present invention is right respectively with certain type ultrashort wave radio set as subjects
Tested radio station has carried out single-frequency continuous wave strong signal blocking effect test and double frequency continuous wave strong signal blocking effect test.
For analog communication system, speech intelligibility is the criterion most directly perceived of Simulation communication quality；For number
For word communication system, the quality of digital communication quality is typically all evaluated using the bit error rate.Therefore the present invention selects language respectively
Sound definition and error rates of data are used as Simulation communication station and the criterion of digital communication station communication quality quality.With reference to
Early stage trial test and national military standard《Voice communication interference effect assessment criteria》、《Digital communication interference effect assessment criteria》, selection
Operating failure level (working condition of communications receiving equipment is destroyed under interference signal effect, loses receive capabilities, it is impossible to
Communication) criterion that is disturbed as voice communication radio station, the bit error rate is equal to 10% criterion being disturbed as digital communication radio station.
Single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is tested：
The experiment of radio station single-frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is carried out in open area test site, and specific experiment is matched somebody with somebody
Put as shown in Figure 2.Signal source produces interference signal by producing radiation field by log-periodic antenna after power amplification.For mould
Intend the telecommunication between 2 radio station, the attenuator of 40dB or so will be connected between transmitting station and radiating antenna.Receiving
Radio station side, directional couple device is connected in reception antenna and between receiving radio station, is connected by the detection port of coupling device
Point-to-point signal transmission through fiber system, and the forward direction electricity received at the main frame input port of radio station is monitored in distal end by Optical Fiber Transmission
Pressure (power).Relative position in process of the test between the attitude of each antenna and radio station keeps constant.Transmitting-receiving radio station working frequency
For 40MHz, 60MHz, 80MHz are tested respectively.Result of the test as seen in figures 3-5, f in figureiIt is interference signal frequency, " * "
Voice signal is blocked the watt level of interference signal completely when representing voice communication, and the bit error rate reaches when " o " represents digital communication
To the watt level of 10% interference signal.
By Fig. 3~5 it can be seen that tested radio station electromagnetic interference in different working frequencies sensitive bandwidth all for ±
30kHz or so, this is that interfering frequency deviates radio station working frequency and exceedes because radio frequency front-end filter amplitude versus frequency characte is determined
After 30kHz, critical jamming power is improved and is not less than 40dB, and the outer antijamming capability of tested radio station band is very strong.
Double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect is tested：
Double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect in radio station is tested and tests essentially identical with single-frequency continuous wave,
The difference is that double frequency interference signal is produced by two signal generators, power combing is then carried out by power combiner, passed through
It is radiate by log-periodic antenna after power amplification, other experimental conditions are consistent with single-frequency experiment, specific experiment is matched somebody with somebody
Put as shown in Figure 6.
When it is 40MHz, 60MHz, 80MHz to receive and dispatch radio station working frequency, combined in different interfering frequencies, different faces
Multigroup experiment has been carried out to the digital communication in tested radio station, voice communication under the combination of boundary jamming power.Select wherein four groups at random
Result of the test is as shown in Fig. 7~10.
Can be seen that the combination of power susceptibility under double frequency continuous wave CO_2 laser of tested radio station substantially meets by Fig. 7~10 ellipse
Circle relation, oval major axis and short axle is respectively two threshold values of monofrequency radiation susceptibility, the interference combination inside ellipse, examines
Consider under conditions of test error leaves certain safety coefficient, tested radio station will not be interfered；Interference outside ellipse
Combination, tested radio station will likely be interfered.
Model is verified：
Forecast model is built according to formula (20) to verify above-mentioned four groups of test datas, as a result as shown in table 1 to table 4.
The radio station working frequency of table 1 carries out digital communication checking test when being 40MHz
The radio station working frequency of table 2 carries out digital communication checking test when being 60MHz
The radio station working frequency of table 3 carries out voice communication checking test when being 40MHz
The radio station working frequency of table 4 carries out voice communication checking test when being 80MHz
By the above results as can be seen that different frequency is combined, different capacity intensity combines lower double frequency continuous wave electromagnetic radiation
All 1 or so, predicated error meets army to the effect forecast coefficient S of strong signal blocking disturbing effect forecast model within ± 3dB
With the tolerance requirements of standard, so as to demonstrate the correctness and validity of institute's established model of the present invention.This is meant that when communication electricity
Platform is in the two-frequency electromagnetic field of a certain given frequency and intensity, only it is to be understood that communication station monofrequency radiation effect under the frequency
Susceptibility threshold, can just be predicted to the radiation effect of tested communication station.
The present invention is analyzed by strong signal blocking interference mechanism in receiver band, is set up with the interior big letter of double frequency electromagnetic radiation
Number obstruction disturbing effect forecast model, and with certain type ultra short wave communication radio station as study subject, devises the big signal of communication station
Obstruction disturbing effect testing program.Effect is disturbed by single-frequency in communication station band and the strong signal blocking of double frequency continuous wave electromagnetic radiation
Should test, have studied tested radio station electromagnetic radiation sensitivity Changing Pattern under double frequency difference weight compound action in band.Experiment
Result shows that the lower double frequency continuous wave electromagnetic radiation strong signal blocking disturbing effect of different frequency combination, the combination of different capacity intensity is pre-
Model coefficient is surveyed all 1 or so, predicated error demonstrates double frequency continuous wave electromagnetic radiation in receiver band all within ± 3dB
The validity of strong signal blocking disturbing effect forecast model.
Claims (2)
1. double frequency electromagnetic radiation strong signal blocking disturbing effect Forecasting Methodology in a kind of receiver band, it is characterised in that including as follows
Step：
1) measuring receiver is in single-frequency f1、f2Power susceptibility threshold value P' under interference1、P'2；
Receiver is in single-frequency f1、f2Power susceptibility threshold value P' under interference1、P'2Measuring method it is as follows：Produced using signal source
Mono-tone interference signal, by producing radiation field by log-periodic antenna after power amplification, arranges transmitting station in radiation field
With receive radio station, and attenuator is connected between transmitting station and radiating antenna, lead at a distance between two radio station for being simulated
Believe the decay to signal, receiving radio station side, directional couple device is connected between reception antenna and reception radio station, by orientation
The detection port of coupling device is connected to a signal transmission through fiber system, and connects frequency by point-to-point signal transmission through fiber system
Spectrometer, the forward power received at the main frame input port of radio station is monitored by spectrum analyzer in distal end；In test, hair
Radio platform launches normal communications signal, and log-periodic antenna produces interference radiation field to disturb receiving radio station, and observation is received
The strong signal blocking disturbing effect phenomenon that radio station occurs, and recorded under the effect of single-frequency continuous wave electromagnetic radiation by spectrum analyzer
Communication station strong signal blocking disturbing effect power susceptibility threshold value；
2) measuring receiver is in f1、f2Power combination P under two frequencies interference simultaneously1、P2；
Receiver is in f1、f2Power combination P under two frequencies interference simultaneously1、P2Measuring method it is as follows：Two signal sources are each
Produce a mono-tone interference signal, using power combiner by two mono-tone interference signals through carrying out power combing, synthesis it is dry
Disturb after signal amplifies through power amplifier and radiation field is produced by log-periodic antenna, transmitting station is arranged in radiation field and is connect
Radio station is received, and attenuator is connected between transmitting station and radiating antenna, for telecommunication pair between two radio station of simulation
The decay of signal, is receiving radio station side, directional couple device is connected between reception antenna and reception radio station, by directional couple
The detection port tie point of device connects frequency spectrum to a signal transmission through fiber system by point-to-point signal transmission through fiber system
Analyzer, the forward power received at the main frame input port of radio station is monitored by spectrum analyzer in distal end；In test, transmitting
Normal communications signal is launched in radio station, and log-periodic antenna produces two interference radiation fields of mono-tone interference signal synthesis, to receiving
Radio station is disturbed, and changes different frequency and power combination is tested, and is recorded when communication station goes out by spectrum analyzer
Two power combination P of mono-tone interference signal during existing strong signal blocking disturbing effect1、P2；
3) by power susceptibility threshold value P'1、P'2With power combination P1、P2Substitute into formulaPairing effect predictive coefficient S
Calculated, when the value of effect forecast coefficient S reaches 1, prediction receiver is imitated there may be corresponding strong signal blocking interference
Should；Conversely, if S is less than 1, receiver is not in necessarily strong signal blocking disturbing effect.
2. double frequency electromagnetic radiation strong signal blocking disturbing effect Forecasting Methodology in receiver band as claimed in claim 1, it is special
Levy and be：The point-to-point signal transmission through fiber system includes electrical to optical converter, Transmission Fibers and optical-electrical converter, the electric light
Converter is connected with one end of Transmission Fibers, and optical-electrical converter is connected with the other end of Transmission Fibers.
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| CN106569074B (en) * | 2016-11-15 | 2017-10-27 | 中国人民解放军军械工程学院 | Conducted susceptibility method of testing based on coupling device |
| 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 |
| CN107360580B (en) * | 2017-07-31 | 2020-10-30 | 中国人民解放军63892部队 | Communication efficiency evaluation test method and device for ultrashort wave wireless communication equipment |
| CN108270487B (en) * | 2017-12-11 | 2019-10-08 | 上海微波技术研究所（中国电子科技集团公司第五十研究所） | Fibre-optic transmission system (FOTS) based on ultrashort wave radio set |
| CN108490281B (en) * | 2018-01-31 | 2020-08-11 | 中国人民解放军陆军工程大学 | Method for predicting random noise electromagnetic radiation effect of frequency equipment and terminal equipment |
| CN109347499B (en) * | 2018-09-30 | 2022-03-29 | 中国人民解放军海军工程大学 | Method for analyzing interference mechanism of radio frequency front end of communication receiver |
| CN109547130B (en) * | 2018-12-12 | 2021-06-08 | 中国人民解放军陆军工程大学 | Method and device for predicting second-order intermodulation low-frequency blocking effect of out-of-band electromagnetic radiation |
| CN110632386B (en) * | 2019-08-16 | 2021-07-30 | 山东大学 | Solar radio interference filtering method, readable storage medium and electronic equipment |
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| CN101661686B (en) * | 2009-09-18 | 2011-07-20 | 中国舰船研究设计中心 | Laboratory simulation method of ship surface composite electromagnetic environment |
| CN102164013B (en) * | 2011-04-18 | 2013-12-11 | 西安电子科技大学 | Electromagnetic compatibility (EMC) comprehensive predictive analysis system and analysis method for co-site interference of radio station |
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