CN102128990B - 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 PDFInfo
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- CN102128990B CN102128990B CN 201110025440 CN201110025440A CN102128990B CN 102128990 B CN102128990 B CN 102128990B CN 201110025440 CN201110025440 CN 201110025440 CN 201110025440 A CN201110025440 A CN 201110025440A CN 102128990 B CN102128990 B CN 102128990B
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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
Technical field
The present invention relates to the electromagnetic compatibility field of automatic testing, be specifically related to a kind of electromagnetic radiation sensitivity and automatically judge the saturated method of power amplifier in test.
Background technology
According to GJB151A-97 " military equipment and subsystem Electromagnetic Launching and susceptibility require " regulation, electromagnetic compatibility test comprises electromagnetic interference (EMI) (EMI) test and electromagnetic susceptibility (EMS) test two large divisions, and wherein the electromagnetic susceptibility test comprises again conducted susceptibility and radiosensitivity test.The ultimate principle of susceptibility test is to disturb generation 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, the electromagnetic radiation sensitivity Auto-Test System generally is comprised of signal source, power amplifier, radiating antenna, field sensor, surveillance equipment, PC.The signal source output signal is through the input end of transmit by RF cable to power amplifier, power amplifier output terminal output high-power signal is to radiating antenna excitation end, radiating antenna produces the undesired signal of some strength 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 is control port and the signal source of connection monitoring equipment respectively, adds the electromagnetic radiation field acquisition process and controls the instrument parameter setting of monitoring equipment what monitoring equipment received on the one hand; The also instrument parameter setting in control signal source, according to the regulation of GJB151A-97 standard for the field intensity ultimate value, adjust 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 test, need to be in wider frequency range add electromagnetic radiation field to investigate the electromagnetic susceptibility of test specimen to what test specimen applied some strength.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 to an initial amplitude be set to signal source, adjust with this as the starting point the signal source output amplitude, make the electromagnetic radiation field strength that adds that field sensor receives reach the intensity (ultimate value) that testing standard is stipulated, then just can step to next test frequency point and continue test.In electromagnetic radiation sensitivity is tested automatically, when being regulated, the signal source output amplitude need to 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 until the requirement of standard limit value is satisfied in output; If input signal enters the amplifier nonlinearity saturation region, 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 build-in attribute that the gain compression phenomenon is power amplifier appears in the non-linearity of power amplifier saturation region, and inevitable, but the position of non-linear saturation area can not accurately be located.Therefore, whether need to differentiate ingoing power amplifier nonlinearity saturation region when increasing power amplifier input signal amplitude (being the signal source output amplitude).
The method that existing judgement power amplifier is saturated is all differentiated with experience controlled circulation number of times.As shown in Figure 3, E in Fig. 3 is the standard electric field strength, difference DELTA when the field intensity value of standard limit value and test position in process of the test does not satisfy threshold values X requirement, still a less scope Z (in Z＞X) time, namely | 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 simultaneously power amplifier, adopted a kind of saturated method 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 judges the saturated method of power amplifier in test automatically, comprises the steps:
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:
If a is i=1, carried out for the 4th step;
If b is 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, 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, calculating standard limit 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; If difference DELTA does not meet the demands, enter step 6; The general value of X is 0.1～0.5, preferably is taken as 0.1.
Step 7, repeating step two～step 6, until difference DELTA satisfies | Δ |＜X, the adjustment of the signal source of current frequency is complete, proceeds the amplitude adjustment of next frequency.
The invention has the advantages that:
1, reduce 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 again the accuracy of test.
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 extends the power amplifier life-span.
Description of drawings
Fig. 1 is radiosensitivity test block diagram in 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 judges the saturated method of power amplifier in 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 antenna used 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:
If a is i=1, order was carried out for the 4th step;
If b is i＞and 1, first electric field intensity increment and the signal source output amplitude increment at test position place compared, judge whether power amplifier enters non-linear saturation area, if power amplifier enters non-linear saturation area, can not satisfy standard-required in this test frequency power amplifier output signal intensity, tracer signal source output amplitude and carry out next frequency adjustment; If power amplifier does not enter non-linear saturation area, 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 undesirable 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, calculating standard limit 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, namely | 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; If difference DELTA does not satisfy the requirement of threshold values X, 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, repetition second step～6th step, until difference DELTA satisfies the requirement of threshold values X, namely | Δ |＜X, the adjustment of the signal source of current frequency is complete, proceeds the amplitude adjustment of next frequency.
Claims (4)
1. an electromagnetic radiation sensitivity judges the saturated method of power amplifier in 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 antenna used 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:
If a is i=1, carried out for the 4th step;
If b is 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, 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 returned to step 1 and carried out next frequency adjustment; Wherein, α is for adjusting coefficient;
The intensity E of step 4, calculating standard limit value E and the actual undesired signal that records
0Between difference DELTA, Δ=E-E
0, the standard limit value use dB μ V/m of E unit, 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 return to step 1 and carry out next frequency adjustment; If do not satisfy, 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, until difference DELTA satisfies | Δ |＜X, the adjustment of the signal source of current frequency is complete, returns to step 1 and proceeds next frequency adjustment.
2. a kind of electromagnetic radiation sensitivity according to claim 1 judges the saturated method of power amplifier in test automatically, and it is characterized in that: the actual electric field intensity value that records described in step 2 is to obtain by surveillance equipment.
3. a kind of electromagnetic radiation sensitivity according to claim 1 judges the saturated method of power amplifier in test automatically, and it is characterized in that: the threshold X value is 0.1.
4. a kind of electromagnetic radiation sensitivity according to claim 1 judges the saturated method of power amplifier in 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 |
| 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 |
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| 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 |
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| 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 |
| CN113114392B (en) * | 2021-03-23 | 2023-03-21 | 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 |
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| 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 |
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| CN101344559B (en) * | 2008-09-04 | 2010-06-30 | 北京航空航天大学 | Signal source amplitude adjustment method in electromagnetic compatibility sensitivity test |
| CN101344560B (en) * | 2008-09-04 | 2011-01-26 | 北京航空航天大学 | Method for adjusting output amplitude of signal source in electromagnetic compatibility sensitivity test |
| CN101349730B (en) * | 2008-09-04 | 2010-12-15 | 北京航空航天大学 | Method for setting signal source amplitude initial value in electromagnetic radiation sensitiveness automatic test |
| CN101344557B (en) * | 2008-09-04 | 2010-09-15 | 北京航空航天大学 | Radiation sensitivity test method of protection power amplifier |
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Application publication date: 20110720 Assignee: BEIJING HANGTIAN HENGRONG TECHNOLOGY CO.,LTD. CASIC Assignor: Beihang University Contract record no.: 2017990000116 Denomination of invention: Method for judging power amplifier saturation in electromagnetic radiation sensitivity automatic test Granted publication date: 20130508 License type: Exclusive License Record date: 20170406 |
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Application publication date: 20110720 Assignee: Beijing Changying Hengrong Electromagnetic Technology Co.,Ltd. Assignor: BEIHANG University Contract record no.: X2023990000297 Denomination of invention: A Method for Determining Power Amplifier Saturation in Automatic Testing of Electromagnetic Radiation Sensitivity Granted publication date: 20130508 License type: Exclusive License Record date: 20230306 |