CN102128990A - Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test - Google Patents

Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test Download PDF

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CN102128990A
CN102128990A CN2011100254409A CN201110025440A CN102128990A CN 102128990 A CN102128990 A CN 102128990A CN 2011100254409 A CN2011100254409 A CN 2011100254409A CN 201110025440 A CN201110025440 A CN 201110025440A CN 102128990 A CN102128990 A CN 102128990A
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power amplifier
signal source
source output
test
output amplitude
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CN102128990B (en
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戴飞
乔祁
苏东林
白天明
徐坚
赵子华
崔燕舞
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Beihang University
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Abstract

The invention discloses a method for judging power amplifier saturation in an electromagnetic radiation sensitivity automatic test, which belongs to the field of electromagnetic compatibility sensitivity tests. The method determines whether a power amplifier generates the gain compression condition or not by increasing a signal source output amplitude, calculating a difference value delta between a standard limit value E and the practically detected electric field strength value E0 and adjusting the signal source output amplitude increment according to the difference value delta under the condition that the difference value delta does not meet a threshold value X and simultaneously comparing the relation between the difference value delta and the signal source output increment so as to judge whether the power amplifier enters a nonlinear saturation area or not and achieves the aims of determining the signal source output amplitude by dynamically adjusting the amplitude increment and judging whether the power amplifier output meets the standard limit value requirement or not. The method for judging the power amplifier saturation, disclosed by the invention, saves the test time, improves the test efficiency, prolongs the service life of the power amplifier and guarantees the accuracy of electromagnetic compatibility test results.

Description

A kind of electromagnetic radiation sensitivity degree is judged the saturated method of power amplifier in the test automatically
Technical field
The present invention relates to the electromagnetic compatibility field of automatic testing, be specifically related to a kind of electromagnetic radiation sensitivity degree and judge the saturated method of power amplifier in the test automatically.
Background technology
According to GJB151A-97 " military equipment and subsystem Electromagnetic Launching and susceptibility require " regulation, electromagnetic compatibility test comprises electromagnetic interference (EMI) test and electromagnetic susceptibility (EMS) test two large divisions, and wherein the electromagnetic susceptibility test comprises conducted susceptibility and radiosensitivity test again.The ultimate principle of susceptibility test is to disturb generation equipment to produce the electromagnetic interference (EMI) of certain magnitude, lose time very much and manually signal source is regulated, so use automated EMC test system respectively each frequency of test specimen to be carried out the automatic adjusting of signal source amplitude.As shown in Figure 1, electromagnetic radiation sensitivity degree Auto-Test System generally is made up of signal source, power amplifier, radiating antenna, field sensor, surveillance equipment, PC.The signal source output signal transfers to the input end of power amplifier through radio-frequency cable, power amplifier output terminal output high-power signal is to radiating antenna excitation end, radiating antenna produces the undesired signal of certain intensity under the high-power signal excitation, the intensity that adds undesired signal that surveillance equipment collection and display field sensor receive at place, test specimen position, PC connects the control port and the signal source of surveillance equipment respectively, on the one hand adds the electromagnetic radiation field acquisition process and controls the instrument parameter setting of monitoring equipment what monitoring equipment received; The also instrument parameter setting in control signal source according to the regulation of GJB151A-97 standard for the field intensity ultimate value, is adjusted the output amplitude of signal source on the other hand, makes it reach the desired ultimate value of GJB151A-97 standard.
In electromagnetic radiation sensitivity degree test, need be in wider frequency add electromagnetic radiation field to investigate the electromagnetic susceptibility of test specimen to what test specimen applied certain intensity.Test specimen position place adds the ultimate value requirement that the electromagnetic radiation field strength must meet certain testing standard, so when each frequency applies interference, need an initial amplitude be set to signal source, adjust the signal source output amplitude with this as the starting point, the electromagnetic radiation field strength that adds that makes field sensor receive reaches the intensity (ultimate value) that testing standard is stipulated, just can step to next test frequency point then and continue test.In the electromagnetic radiation sensitivity degree is tested automatically, when being regulated, the signal source output amplitude need judge whether power amplifier enters non-linear saturation area, as shown in Figure 2, at input signal not during ingoing power amplifier nonlinearity saturation region, the family curve of power amplifier has amplification characteristic preferably, can continue to increase input signal strength and satisfy the requirement of standard limit value until output; If input signal enters the amplifier nonlinearity saturation region, then continue to increase input signal strength and will can not change power amplifier output signal intensity, can not reach the desired ultimate value of standard, also power amplifier might be burnt out.The gain compression phenomenon occurring in the non-linearity of power amplifier saturation region is a build-in attribute of power amplifier, inevitable, but the position of non-linear saturation area can not accurately be located.Therefore, whether when increasing power amplifier input signal amplitude (being the signal source output amplitude), need differentiate ingoing power amplifier nonlinearity saturation region.
The method that existing judgement power amplifier is saturated is all differentiated with experience Control Circulation number of times.As shown in Figure 3, E among Fig. 3 is the standard electric field strength, difference DELTA when the field intensity value of standard limit value and test position in the process of the test does not satisfy threshold values X requirement, still a small range Z (in the Z＞X) time, promptly | Δ |＜Z, the beginning cycle count, when cycle index reaches an empirical value, be generally 6 times, think that power amplifier enters non-linear saturation area, the output of judgement power amplifier can not be satisfied the requirement of standard limit value, quits a program.
Judge that to power amplifier is whether saturated following shortcoming is arranged in this way:
1, the method adopts the experience cycle index, may carry out repeatedly circulation in the saturation region of power amplifier, the cost plenty of time, has reduced the efficient of testing.
2, constantly increasing input signal amplitude in the power amplifier saturation region may cause damage to power amplifier, reduces power amplifier properties.
Summary of the invention
The present invention judges in order the gain compression situation whether to occur by the observation power amplifier whether it enters non-linear saturation area; determine that can power amplifier output satisfy the requirement of standard limit value; protect power amplifier simultaneously, adopted the saturated method of a kind of quick judgement power amplifier.By the relation of compare test position field intensity increment and signal source amplitude output signal increment, judge whether power amplifier enters non-linear saturation area.
A kind of electromagnetic radiation sensitivity degree is judged the saturated method of power amplifier in the test automatically, comprises the steps:
Step 1, the initial cycle count value is made as i=1, setting signal source output amplitude S simultaneously, S sets according to the antenna factor of used antenna in difference test frequency signal source output amplitude;
The electric field intensity value E of step 2, read test position 0, electric field intensity value E 0Applying unit is dB μ V/m;
Step 3, judgement cycle index i, carry out different operations according to cycle index i:
A, if i=1, then carried out for the 4th step;
B, if i＞1, and the electric field intensity increment (E at test position place 0-E 1) and signal source output amplitude increment (α Δ) between satisfy 0.8＜(E 0-E 1)/α Δ＜1.25, then power amplifier does not enter non-linear saturation area, carries out for the 4th step; Otherwise power amplifier enters non-linear saturation area, and tracer signal source output amplitude is also carried out next frequency adjustment.
Step 4, basis of calculation ultimate value E and the actual electric field intensity value E that records 0Between difference DELTA, this moment, standard limit value E used dB μ V/m equally, the unit that obtains difference DELTA is dB, Δ=E-E 0
Step 5, judge that whether difference DELTA satisfies | Δ |＜X, if difference DELTA meets the demands, tracer signal source output amplitude and carry out next frequency adjustment then; If difference DELTA does not meet the demands, then enter step 6; The general value of X is 0.1～0.5, preferably is taken as 0.1.
Step 6, adjust signal source output amplitude S=S+ α Δ, cycle index adds 1 simultaneously, i.e. i=i+1, and make E 1=E 0Wherein, α generally is taken as 0.5≤α≤0.9 for adjusting coefficient, preferably is taken as 0.8.
Step 7, repeating step two～step 6, satisfy up to difference DELTA | Δ |＜X, then the signal source adjustment of current frequency finishes, and proceeds the amplitude adjustment of next frequency.
The invention has the advantages that:
1, reduces the time of experimental test, improve the efficient of test.
2, the mode with stepping makes test position field intensity value draw close to the standard limit value, has both protected testing apparatus, has guaranteed the accuracy of test again.
3, judge by quick whether power amplifier enters non-linear saturation area, reduce the number of times that increases input signal in non-linear saturation area, the protection power amplifier prolongs the power amplifier life-span.
Description of drawings
Fig. 1 is a radiosensitivity test block diagram in the prior art;
Fig. 2 is the power amplifier family curve;
Fig. 3 is existing judgement power amplifier saturation process process flow diagram;
Fig. 4 is the process flow diagram of the inventive method.
Embodiment
Below in conjunction with accompanying drawing method of the present invention is elaborated.
A kind of electromagnetic radiation sensitivity degree is judged the saturated method of power amplifier in the test automatically, and flow process has following steps as shown in Figure 4:
The first step, the initial cycle count value is made as i=1, simultaneously setting signal source initial amplitude S;
S sets according to the antenna factor of used antenna in difference test frequency signal source output amplitude.
The electric field intensity value E of second step, read test position 0, electric field intensity value E 0Applying unit is dB μ V/m, is convenient to subsequent calculations;
The 3rd step, judgement cycle index i, carry out different operations according to the difference of cycle index i:
A, if i=1, then order was carried out for the 4th step;
B, if i＞1, then elder generation compares the electric field intensity increment and the signal source output amplitude increment at test position place, judge whether power amplifier enters non-linear saturation area, if power amplifier enters non-linear saturation area, then can not satisfy standard-required, then tracer signal source output amplitude and carry out next frequency adjustment in this test frequency power amplifier output signal intensity; If power amplifier does not enter non-linear saturation area, then order was carried out for the 4th step;
Electric field intensity increment (E with the test position place 0-E 1) compare with signal source output amplitude increment (α Δ), consider the unfavorable situation of dynamic range internal linear of power amplifier, use discriminant 0.8＜(E 0-E 1)/α Δ＜1.25 are differentiated, and judge whether power amplifier the gain compression situation occurs, and wherein, α generally is taken as 0.5～0.9 for adjusting coefficient.If 0.8＜(E 0-E 1Set up)/α Δ＜1.25, and power amplifier does not enter non-linear saturation area; Otherwise power amplifier enters non-linear saturation area.
The 4th step, basis of calculation ultimate value E and the actual electric field intensity value E that records 0Between difference DELTA, Δ=E-E 0, this moment, standard limit value E used dB μ V/m equally, and the unit that obtains difference DELTA is dB;
The 5th the step, judge whether difference DELTA satisfies the requirement of threshold values X, promptly | Δ |＜X, the general value of X is 0.1～0.5, preferably is taken as 0.1.If difference DELTA satisfies the requirement of threshold values X, tracer signal source output amplitude and carry out next frequency adjustment then; If difference DELTA does not satisfy the requirement of threshold values X, then entered for the 6th step;
The actual electric field intensity value that records obtains by surveillance equipment.
Difference DELTA is used for estimating the electric field intensity value of test and the distance between the standard limit value, is next step foundation of adjusting signal source amplitude increment.
The 6th step, adjust signal source output amplitude S=S+ α Δ, cycle index adds 1 simultaneously, i.e. i=i+1, and make E 1=E 0Wherein, α generally is taken as 0.5≤α≤0.9 for adjusting coefficient, preferably is taken as 0.8.
The 7th step, repeat～the six step of second step, satisfy the requirement of threshold values X up to difference DELTA, promptly | Δ |＜X, then the signal source adjustment of current frequency finishes, and proceeds the amplitude adjustment of next frequency.

Claims (4)

1. an electromagnetic radiation sensitivity degree is judged the saturated method of power amplifier in the test automatically, it is characterized in that comprising the steps:
Step 1, the initial cycle count value is made as i=1, simultaneously setting signal source output amplitude S;
S sets according to the antenna factor of used antenna in difference test frequency signal source output amplitude;
The electric field intensity value E of step 2, read test position 0
Electric field intensity value E 0Applying unit is dB μ V/m;
Step 3, judgement cycle index i, carry out different operations according to cycle index i:
A, if i=1, then carried out for the 4th step;
B, if i＞1, and the electric field intensity increment (E at test position place 0-E 1) and signal source output amplitude increment (α Δ) between satisfy 0.8＜(E 0-E 1)/(α Δ)＜1.25, then power amplifier does not enter non-linear saturation area, carries out for the 4th step; Otherwise power amplifier enters non-linear saturation area, and tracer signal source output amplitude is also carried out next frequency adjustment; Wherein, α is for adjusting coefficient;
The intensity E of step 4, basis of calculation ultimate value E and the actual undesired signal that records 0Between difference DELTA, Δ=E-E 0, standard limit value E unit uses dB μ V/m, and the unit of difference DELTA is dB;
Step 5, judge that whether difference DELTA satisfies | Δ |＜X, if satisfy, tracer signal source output amplitude and carry out next frequency adjustment then; If do not satisfy, then execution in step six; Wherein the threshold X value is 0.1≤X≤0.5;
Step 6, adjust signal source output amplitude S=S+ α Δ, cycle index adds 1 simultaneously, i.e. i=i+1, and make E 1=E 0Wherein, α is taken as 0.5≤α≤0.9 for adjusting coefficient;
Step 7, repeating step two～six, satisfy up to difference DELTA | Δ |＜X, then the signal source adjustment of current frequency finishes, and proceeds the amplitude adjustment of next frequency.
2. a kind of electromagnetic radiation sensitivity degree according to claim 1 is judged the saturated method of power amplifier in the test automatically, and it is characterized in that: the actual electric field intensity value that records described in the step 2 is to obtain by surveillance equipment.
3. a kind of electromagnetic radiation sensitivity degree according to claim 1 is judged the saturated method of power amplifier in the test automatically, and it is characterized in that: the threshold X value is 0.1.
4. a kind of electromagnetic radiation sensitivity degree according to claim 1 is judged the saturated method of power amplifier in the test automatically, it is characterized in that: adjusting the factor alpha value is 0.8.
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CN106990311A (en) * 2017-05-22 2017-07-28 中国电子科技集团公司第四十研究所 Judge the system and method whether field strength is stablized in a kind of radiosensitivity test
CN107121647A (en) * 2017-04-06 2017-09-01 上海斐讯数据通信技术有限公司 The sensitivity measuring method and system of a kind of core inductance
CN107657386A (en) * 2017-09-30 2018-02-02 北京无线电测量研究所 A kind of method and system for the damage risk for determining device
CN110595524A (en) * 2018-06-12 2019-12-20 迈来芯保加利亚有限公司 Sensor saturation fault detection
CN111025028A (en) * 2019-12-30 2020-04-17 内蒙合成化工研究所 Solid propellant electromagnetic radiation sensitivity testing device and method
CN112415265A (en) * 2020-09-04 2021-02-26 西安益翔航电科技有限公司 System and method for testing radio frequency conducted sensitivity of redundancy
CN112904091A (en) * 2021-01-13 2021-06-04 成都四威功率电子科技有限公司 PID-based field intensity radiation automatic test system control method
CN113114392A (en) * 2021-03-23 2021-07-13 中国电子科技集团公司第二十九研究所 Method and device for automatically testing sensitivity of broadband radio frequency system
CN113866516A (en) * 2021-09-30 2021-12-31 北京航空航天大学 Signal source amplitude adjusting method and device based on noise floor area judgment
CN114217141A (en) * 2021-10-29 2022-03-22 江铃汽车股份有限公司 Vehicle electromagnetic compatibility test method, system, storage medium and test equipment
CN117375736A (en) * 2023-12-08 2024-01-09 南京纳特通信电子有限公司 Differential mode injection test method and system for electromagnetic compatibility sensitivity test

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CN101344557A (en) * 2008-09-04 2009-01-14 北京航空航天大学 Radiation sensitivity test method of protection power amplifier
CN101349730A (en) * 2008-09-04 2009-01-21 北京航空航天大学 Method for setting signal source amplitude initial value in electromagnetic radiation sensitiveness automatic test

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CN101344559A (en) * 2008-09-04 2009-01-14 北京航空航天大学 Signal source amplitude adjustment method in electromagnetic compatibility sensitivity test
CN101344560A (en) * 2008-09-04 2009-01-14 北京航空航天大学 Method for adjusting output amplitude of signal source in electromagnetic compatibility sensitivity test
CN101344557A (en) * 2008-09-04 2009-01-14 北京航空航天大学 Radiation sensitivity test method of protection power amplifier
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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107121647A (en) * 2017-04-06 2017-09-01 上海斐讯数据通信技术有限公司 The sensitivity measuring method and system of a kind of core inductance
CN107121647B (en) * 2017-04-06 2020-02-11 上海斐讯数据通信技术有限公司 Magnetic core inductance sensitivity measurement method and system
CN106990311A (en) * 2017-05-22 2017-07-28 中国电子科技集团公司第四十研究所 Judge the system and method whether field strength is stablized in a kind of radiosensitivity test
CN107657386A (en) * 2017-09-30 2018-02-02 北京无线电测量研究所 A kind of method and system for the damage risk for determining device
CN110595524A (en) * 2018-06-12 2019-12-20 迈来芯保加利亚有限公司 Sensor saturation fault detection
CN111025028A (en) * 2019-12-30 2020-04-17 内蒙合成化工研究所 Solid propellant electromagnetic radiation sensitivity testing device and method
CN112415265A (en) * 2020-09-04 2021-02-26 西安益翔航电科技有限公司 System and method for testing radio frequency conducted sensitivity of redundancy
CN112904091B (en) * 2021-01-13 2023-11-21 成都四威功率电子科技有限公司 Control method of field intensity radiation automatic test system based on PID
CN112904091A (en) * 2021-01-13 2021-06-04 成都四威功率电子科技有限公司 PID-based field intensity radiation automatic test system control method
CN113114392A (en) * 2021-03-23 2021-07-13 中国电子科技集团公司第二十九研究所 Method and device for automatically testing sensitivity of broadband radio frequency system
CN113866516A (en) * 2021-09-30 2021-12-31 北京航空航天大学 Signal source amplitude adjusting method and device based on noise floor area judgment
CN113866516B (en) * 2021-09-30 2022-05-10 北京航空航天大学 Signal source amplitude adjustment method and device based on noise floor area judgment
CN114217141A (en) * 2021-10-29 2022-03-22 江铃汽车股份有限公司 Vehicle electromagnetic compatibility test method, system, storage medium and test equipment
CN114217141B (en) * 2021-10-29 2024-04-30 江铃汽车股份有限公司 Vehicle electromagnetic compatibility testing method, system, storage medium and testing equipment
CN117375736A (en) * 2023-12-08 2024-01-09 南京纳特通信电子有限公司 Differential mode injection test method and system for electromagnetic compatibility sensitivity test
CN117375736B (en) * 2023-12-08 2024-02-27 南京纳特通信电子有限公司 Differential mode injection test method and system for electromagnetic compatibility sensitivity test

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