CN101373201A - Method for determining radiation safety margin examining frequency point - Google Patents
Method for determining radiation safety margin examining frequency point Download PDFInfo
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- CN101373201A CN101373201A CNA2008102243021A CN200810224302A CN101373201A CN 101373201 A CN101373201 A CN 101373201A CN A2008102243021 A CNA2008102243021 A CN A2008102243021A CN 200810224302 A CN200810224302 A CN 200810224302A CN 101373201 A CN101373201 A CN 101373201A
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Abstract
The invention discloses a method for determining the test frequency point of the radiation safety margin through comparing and interpolating according to the self-radiating emission of the tested product and the background ambient level. The chosen frequency points according to the method can be much fewer than the frequency points of the self-radiating emission of the tested product, and the spectral envelope can be basically consistent with that of the self-radiating emission of the tested product, that is, the key frequency point basically cannot be omitted, thereby greatly improving the efficiency and the accuracy of the test; on the other hand, since the test frequency point is reduced, the test time is shortened, thereby protecting test devices and instruments, particularly the device with limited service life, such as the amplifier type.
Description
Technical field
The present invention relates to a kind of according to test specimen self Radiation Emission and background environment level, by relatively and interpolation determine the method for radiation safety margin examining frequency point, be applicable to that the electromagnetic compatibility radiation safety margin tests.
Background technology
According to GJB1389A-2005 " system Electro Magnetic Compatibility require " regulation, margin of safety is meant the poor of relative value between the actual interference signal level in susceptibility threshold and the environment, represents with dB.Uncertain factor in the time of should be according to the inconsistency of system works performance demands, system hardware and verification system designing requirement is determined margin of safety.The margin of safety test is an important component part in the system-level electromagnetic compatibility test.
The margin of safety test comprises radiation safety margin and conduction safety margin.
Two steps of the general branch of radiation safety margin test: the first step under the testing apparatus normal operating conditions, requires to use receiving antenna to measure test specimen self Radiation Emission (referring to shown in Figure 1) according to measuring distance; Second step, by radiating antenna test specimen is applied radiation field intensity and disturb (referring to shown in Figure 2), radiated electric field strength ratio test specimen self the Radiation Emission intensity that requirement records at the same frequency of same position exceeds the margin of safety value of regulation, this moment, responsive phenomenon did not appear in test specimen, illustrate that then test specimen satisfies the margin of safety requirement of regulation at this frequency, otherwise claim test specimen not satisfy the margin of safety requirement of regulation at this frequency.
In the radiation safety margin test, the selection of examining frequency point is a key issue.Existing dependence test standard is not done strict regulation to the test frequency, this has brought certain difficulty for the enforcement of electromagnetic compatibility margin of safety test, if frequency step test according to the standard code in the radiation emission test, test result is correct, but because the very lengthenings that cause the whole test duration of frequency more, this makes that on the one hand testing efficiency is low, also testing apparatuss such as power amplifier has been proposed requirement; If select the test of some frequencies arbitrarily, may the many crucial frequencies of test leakage, and if just in time do not satisfy the index of margin of safety at the frequency of not testing, the correctness of test and integrality just are difficult to guarantee.How rationally to choose the test frequency, improve the difficult point that testing efficiency becomes the margin of safety test.
Summary of the invention
The objective of the invention is to propose a kind of according to test specimen self Radiation Emission and background environment level, by relatively and interpolation determine the method for radiation safety margin examining frequency point.
The method of definite radiation safety margin examining frequency point of the present invention, the step that its radiation safety margin examining frequency point obtains is as follows:
Step 101: test specimen is in not under the duty, obtains background environment level N
Radiation(f, u
0-E);
For radiation safety margin, use receiving antenna to measure the background environment level N of test specimen place test zone
Radiation(f, u
0-E), test frequency number is n; F represents test frequency, and unit is Hz; u
0-EExpression background environment level electric field intensity, unit is dB μ V/m;
Step 102: test specimen is in running order down, obtains test specimen self Radiation Emission E
Radiation(f, u
1-E);
For radiation safety margin, require to use receiving antenna to measure test specimen self Radiation Emission E according to measuring distance
Radiation(f, u
1-E), the test frequency range is identical with step 101 with the test frequency; u
1-EBe illustrated in test specimen self the Radiation Emission intensity in the radiation safety margin test, unit is dB μ V/m;
Step 103: obtain difference DELTA
E
According to the u that obtains in the step 102
1-EWith the u that obtains in the step 101
0-ECarry out difference relatively, obtain difference DELTA in the radiation safety margin test
EThis Δ
EIt is the value that test specimen self Radiation Emission intensity exceeds the background environment level;
Step 104: screening examining frequency point f
1
According to the Δ in preset threshold α and the step 103
EAdopt the peak detection mode to screen examining frequency point f
1This f
1It is the Δ that from f, screens
EThe peak value frequency that is higher than the α correspondence; f
1In frequency count and be m, and m≤n;
Step 105: calculate interpolation frequency f
2
Utilize n, the m in the step 104, the test frequency f in contract ratio β, the step 101 in the step 101 to calculate interpolation frequency f
2Wherein calculation procedure is:
Step 151: the n in the calculation procedure 101 and the ratio r=n/m of the m in the step 104, and get the integral part [r] of ratio r;
Step 152: the integral part [r] that relatively obtains r and the relative smaller value min between the ratio β of contracting ([r], β);
Step 153: ([r] β) carries out the interval to f and chooses and obtain interpolation frequency f according to min
2, the frequency space-number be min ([r], β);
Step 106: to the f in the step 104
1With the f in the step 105
2Carry out union and handle, obtain primary election frequency f
3
Step 107: adjacent frequency screening
According to frequency step minimum value γ to the f in the step 106
3Carry out the adjacent frequency screening, obtain radiation safety margin examining frequency point f
4
The present invention determines the advantage of the method for radiation safety margin examining frequency point: the frequency number of selecting according to the inventive method is than test specimen self Radiation Emission E
Radiation(f, u
1-E) the frequency number a lot of less, and spectrum envelope fundamental sum test specimen self Radiation Emission E
Radiation(f, u
1-E) the spectrum envelope unanimity, promptly can not occur omitting phenomenon basically, thereby improve the accuracy of testing efficiency and test greatly for crucial frequency; On the other hand, because the test frequency reduces, bring the shortening of test duration, this also is a kind of protection as power amplifier class limited equipment in serviceable life especially for testing apparatus and instrument.
Description of drawings
Fig. 1 is the configuration schematic diagram of self Radiation Emission of test test specimen.
Fig. 2 is to use radiating antenna that test specimen is applied the strongly disturbing configuration schematic diagram of radiation field.
Fig. 3 is the FB(flow block) that the present invention determines radiation safety margin examining frequency point.
Fig. 4 is a background environment level spectrum curve among the embodiment.
Fig. 5 is test specimen self a Radiation Emission spectrum curve among the embodiment.
Fig. 6 is screening examining frequency point f among the embodiment
1Corresponding test specimen self Radiation Emission spectrum curve.
Fig. 7 is interpolation frequency f among the embodiment
2Corresponding test specimen self Radiation Emission spectrum curve.
Fig. 8 is primary election frequency f among the embodiment
3Corresponding test specimen self Radiation Emission spectrum curve.
Fig. 9 is radiation safety margin examining frequency point f among the embodiment
4Corresponding test specimen self Radiation Emission spectrum curve.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Referring to shown in Figure 3, the present invention is a kind of according to test specimen self Radiation Emission and background environment level, and by relatively determine the method for radiation safety margin examining frequency point with interpolation, the step that its radiation safety margin examining frequency point obtains is as follows:
Step 101: test specimen is in not under the duty, obtains background environment level N
Radiation(f, u
0-E);
For radiation safety margin, use receiving antenna to measure the background environment level N of test specimen place test zone
Radiation(f, u
0-E), test frequency number is n (n is the natural number greater than 1, for the frequency number of choosing in the test, as 500 test points, 2000 test points); F represents test frequency, and unit is Hz; u
0-EExpression background environment level electric field intensity, unit is dB μ V/m;
Step 102: test specimen is in running order down, obtains test specimen self Radiation Emission E
Radiation(f, u
1-E);
For radiation safety margin, require to use receiving antenna to measure test specimen self Radiation Emission E according to measuring distance
Radiation(f, u
1-E), the test frequency range is identical with step 101 with the test frequency;
u
1-EBe illustrated in test specimen self the Radiation Emission intensity in the radiation safety margin test, unit is dB μ V/m;
Step 103: obtain difference DELTA
E
According to the u that obtains in the step 102
1-EWith the u that obtains in the step 101
0-ECarry out difference relatively, obtain difference DELTA in the radiation safety margin test
EThis Δ
EIt is the value that test specimen self Radiation Emission intensity exceeds the background environment level;
In the present invention, adopt the method for difference can extract the stronger frequency of test specimen self Radiation Emission intensity effectively, this also is the frequency of high spot review in the radiation safety margin test.Choose examining frequency point targetedly than nothing in the classic method and improved efficient, reduced the integrated testability time.
Step 104: screening examining frequency point f
1
According to the Δ in preset threshold α and the step 103
EAdopt the peak detection mode to screen examining frequency point f
1This f
1It is the Δ that from f, screens
EThe peak value frequency that is higher than the α correspondence;
Wherein, f
1In frequency count and be m, and m≤n;
In the present invention, the value of threshold alpha has determined examining frequency point f
1Number, α is big more, f
1Frequency points few more.
Step 105: calculate interpolation frequency f
2
Utilize n, the m in the step 104, the test frequency f in contract ratio β, the step 101 in the step 101 to calculate interpolation frequency f
2Wherein calculation procedure is:
Step 151: the n in the calculation procedure 101 and the ratio r=n/m of the m in the step 104, and get the integral part [r] of ratio r;
Step 152: the integral part [r] that relatively obtains r and the relative smaller value min between the ratio β of contracting ([r], β);
Step 153: ([r] β) carries out the interval to f and chooses and obtain interpolation frequency f according to min
2, the frequency space-number be min ([r], β);
In the present invention, the contract value of ratio β has determined interpolation frequency f
2Number, β is big more, f
2Frequency points few more.
The more weak frequency of some equipment self Radiation Emission intensity also may be responsive frequency, in order to guarantee the comprehensive of radiation safety margin test, the present invention adopts the method for interpolation can remedy incomprehensive this deficiency of the frequency of determining in the step 103 effectively, has improved the accuracy of test.
Step 106: to the f in the step 104
1With the f in the step 105
2Carry out union and handle, obtain primary election frequency f
3
Step 107: adjacent frequency screening
According to frequency step minimum value γ to the f in the step 106
3Carry out the adjacent frequency screening, obtain radiation safety margin examining frequency point f
4
At f
3In, if adjacent two frequency step during less than γ, are then chosen one of them frequency arbitrarily.The value of frequency step minimum value γ has determined radiation safety margin examining frequency point f
4Number, γ is big more, f
4Frequency points few more.
In the present invention, adjacent two frequencies employing is selected one choose mode, can avoid the adjacent frequency repeated test, reduced the test duration, improved testing efficiency.
In the present invention, as can be seen from the above description, the tester can change radiation safety margin examining frequency point f by change threshold alpha, the ratio β that contracts, frequency step minimum value γ
4In frequency points, when α, β, γ big more, the f of selection
4In the frequency number few more, thereby in the accuracy that has improved testing efficiency and test, also increased the dirigibility of automatic test.
The frequency that the frequency of selecting according to the inventive method is selected than traditional step-by-step system lacks a lot, and spectrum envelope fundamental sum test specimen self Radiation Emission E
Radiation(f, u
1-E) the spectrum envelope unanimity, promptly can not occur omitting phenomenon basically, thereby improve the accuracy of testing efficiency and test greatly for crucial frequency; On the other hand, because the test frequency reduces, bring the shortening of test duration, this also is a kind of protection as power amplifier class limited equipment in serviceable life especially for testing apparatus and instrument.
Embodiment:
Test specimen is the boat appearance computing machine of XX model, and the selection test antenna is a biconical antenna, and model is the BCA-9522 of Hua Jie company of Beijing Shenzhen Airlines.
Be the concrete implementation step of the method for a kind of definite radiation safety margin examining frequency point of the present invention below:
Step 101: test specimen is in not under the duty, obtains background environment level N
Radiation(f, u
0-E); Spectrum curve is tested frequency range 30MHz～200MHz referring to shown in Figure 4, and test frequency number is n=4500.
Step 102: test specimen is in running order down, requires to use receiving antenna to measure test specimen self Radiation Emission intensity (referring to shown in Figure 1) according to measuring distance, obtains test specimen self Radiation Emission E
Radiation(f, u
1-E).The test frequency range is identical with step 101 with the test frequency, tests spectrum curve referring to shown in Figure 5,
Step 103: obtain difference DELTA
E
According to the u that obtains in the step 102
1-EWith the u that obtains in the step 101
0-ECarry out difference relatively, obtain difference DELTA in the radiation safety margin test
EThis Δ
EIt is the value that test specimen self Radiation Emission intensity exceeds the background environment level;
Step 104: screening examining frequency point f
1
Setting threshold α=15dB, to the Δ in the step 103
EAdopt the peak detection mode to screen, obtain screening examining frequency point f
1, referring to shown in Figure 6; Screening examining frequency point f
1Frequency count and be m=572.
Step 105: calculate interpolation frequency f
2
Utilize n=4500, the m=572 in the step 104 in the step 101, the test frequency f that is provided with in contract ratio β=8, the step 101 to calculate interpolation frequency f
2, referring to shown in Figure 7, f
2The frequency number be 643; Wherein calculation procedure is:
Step 151: the n=4500 in the calculation procedure 101 and the ratio r=n/m of the m=572 in the step 104, and get integral part [r]=[n/m]=[4500/572]=[7.867]=7 of ratio r;
Step 152: the integral part [r] that relatively obtains r and the relative smaller value min between the ratio β of contracting ([r], β)=7;
Step 153: f is carried out the interval choose and obtain interpolation frequency f
2, the frequency space-number is 7;
Step 106: to the f in the step 104
1With the f in the step 105
2Carry out union and handle, obtain primary election frequency f
3, referring to shown in Figure 8, f
3The frequency number be 1215;
Step 107: adjacent frequency screening
F in the frequency step minimum value γ=0.5% couple step 106 is set
3Carry out the adjacent frequency screening, obtain radiation safety margin examining frequency point f
4, referring to shown in Figure 9, f
4The frequency number be 1068.
This shows that the frequency number of selecting according to the inventive method (referring to shown in Figure 9) is than test specimen self Radiation Emission E
Radiation(f, u
1-E) frequency number (referring to shown in Figure 5) few a lot, and spectrum envelope fundamental sum test specimen self Radiation Emission E
Radiation(f, u
1-E) the spectrum envelope unanimity, promptly can not occur omitting phenomenon basically, thereby improve the accuracy of testing efficiency and test greatly for crucial frequency; On the other hand, because the test frequency reduces, bring the shortening of test duration, this also is a kind of protection as power amplifier class limited equipment in serviceable life especially for testing apparatus and instrument.
Claims (5)
1. the method for a definite radiation safety margin examining frequency point is characterized in that radiation safety margin examining frequency point obtains
Step as follows:
Step 101: test specimen is in not under the duty, obtains background environment level N
Radiation(f, u
0-E);
For radiation safety margin, use receiving antenna to measure the background environment level N of test specimen place test zone
Radiation(f, u
0-E), test frequency number is n; F represents test frequency, and unit is Hz; u
0-EExpression background environment level electric field intensity, unit is dB μ V/m;
Step 102: test specimen is in running order down, obtains test specimen self Radiation Emission E
Radiation(f, u
1-E);
For radiation safety margin, require to use receiving antenna to measure test specimen self Radiation Emission E according to measuring distance
Radiation(f, u
1-E), the test frequency range is identical with step 101 with the test frequency; u
1-EBe illustrated in test specimen self the Radiation Emission intensity in the radiation safety margin test, unit is dB μ V/m;
Step 103: obtain difference DELTA
E
According to the u that obtains in the step 102
1-EWith the u that obtains in the step 101
0-ECarry out difference relatively, obtain difference DELTA in the radiation safety margin test
EThis Δ
EIt is the value that test specimen self Radiation Emission intensity exceeds the background environment level;
Step 104: screening examining frequency point f
1
According to the Δ in preset threshold α and the step 103
EAdopt the peak detection mode to screen examining frequency point f
1This f
1It is the Δ that from f, screens
EThe peak value frequency that is higher than the α correspondence; f
1In frequency count and be m, and m≤n;
Step 105: calculate interpolation frequency f
2
Utilize n, the m in the step 104, the test frequency f in contract ratio β, the step 101 in the step 101 to calculate interpolation frequency f
2Wherein calculation procedure is:
Step 151: the n in the calculation procedure 101 and the ratio r=n/m of the m in the step 104, and get the integral part [r] of ratio r;
Step 152: the integral part [r] that relatively obtains r and the relative smaller value min between the ratio β of contracting ([r], β);
Step 153: ([r] β) carries out the interval to f and chooses and obtain interpolation frequency f according to min
2, the frequency space-number be min ([r], β);
Step 106: to the f in the step 104
1With the f in the step 105
2Carry out union and handle, obtain primary election frequency f
3
Step 107: adjacent frequency screening
According to frequency step minimum value γ to the f in the step 106
3Carry out the adjacent frequency screening, obtain radiation safety margin examining frequency point f
4
2. the method for definite radiation safety margin examining frequency point according to claim 1 is characterized in that: test frequency number is that n is the natural number greater than 1.
3. the method for definite radiation safety margin examining frequency point according to claim 1, it is characterized in that: the value of threshold alpha has determined examining frequency point f
1Number, α is big more, f
1Frequency points few more.
4. the method for definite radiation safety margin examining frequency point according to claim 1, it is characterized in that: the value of the ratio β that contracts has determined interpolation frequency f
2Number, β is big more, f
2Frequency points few more.
5. the method for definite radiation safety margin examining frequency point according to claim 1, it is characterized in that: the value of frequency step minimum value γ has determined radiation safety margin examining frequency point f
4Number, γ is big more, f
4Frequency points few more.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156234A (en) * | 2011-03-28 | 2011-08-17 | 中国舰船研究设计中心 | Method for measuring electromagnetic safety margin of electric initiating explosive device in radar scanning environment |
| CN108519982A (en) * | 2018-02-02 | 2018-09-11 | 江苏艾科半导体有限公司 | A kind of calibration data storage method based on CSV formats |
-
2008
- 2008-10-16 CN CN2008102243021A patent/CN101373201B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102156234A (en) * | 2011-03-28 | 2011-08-17 | 中国舰船研究设计中心 | Method for measuring electromagnetic safety margin of electric initiating explosive device in radar scanning environment |
| CN108519982A (en) * | 2018-02-02 | 2018-09-11 | 江苏艾科半导体有限公司 | A kind of calibration data storage method based on CSV formats |
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| Publication number | Publication date |
|---|---|
| CN101373201B (en) | 2010-09-08 |
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Application publication date: 20090225 Assignee: BEIJING HANGTIAN HENGRONG TECHNOLOGY CO.,LTD. CASIC Assignor: Beihang University Contract record no.: 2017990000116 Denomination of invention: Method for determining radiation safety margin examining frequency point Granted publication date: 20100908 License type: Exclusive License Record date: 20170406 |
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Application publication date: 20090225 Assignee: Beijing Changying Hengrong Electromagnetic Technology Co.,Ltd. Assignor: BEIHANG University Contract record no.: X2023990000297 Denomination of invention: A Method for Determining the Frequency Point of Radiation Safety Margin Examination Granted publication date: 20100908 License type: Exclusive License Record date: 20230306 |
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