CN107255754A - A kind of electromagnetic radiation measuring modification method under the environment based on seanoise - Google Patents
A kind of electromagnetic radiation measuring modification method under the environment based on seanoise Download PDFInfo
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- CN107255754A CN107255754A CN201710466760.5A CN201710466760A CN107255754A CN 107255754 A CN107255754 A CN 107255754A CN 201710466760 A CN201710466760 A CN 201710466760A CN 107255754 A CN107255754 A CN 107255754A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
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- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses the electromagnetic radiation measuring modification method under a kind of environment based on seanoise, comprise the following steps that：The resolution belt width values set according to spectrum analyzer, seanoise modifying factor is calculated with Bimodal Noise model；The signal power obtained by seanoise modifying factor and measurement, calculates signal power actual value；According to obtained signal power actual value, with reference to measurement antenna parameter, revised electromagnetic radiation intensity is calculated.The characteristics of present invention is by considering noise and Bimodal Noise model in spectrum analyzer internal noise, electromagnetic radiation measuring environment Multiple factors, the prediction of spectrum analyzer ground noise is modeled, the model set up can be accurately measured to electromagnetic radiation.This method measurement accurate to electromagnetic radiation, environmental protection and the healthy of people have great reference value, with good social benefit.
Description
Technical field
The present invention relates to the electromagnetic radiation measuring modification method under a kind of environment based on seanoise.
Background technology
From the operation principle of spectrum analyzer, noise is ubiquitous, the presence of noise among measurement process
Very important error is brought to electromagnetic radiation measuring result, it is therefore desirable to seek a kind of modification method to overcome noise to electromagnetism
The influence of actinometry.
More noise model is used now for Gaussian noise, and in marine environment, statistical property and the Gauss of noise make an uproar
Acoustic model, impulsive noise model have differences, and Bimodal Noise is the mixing being superimposed as by Gaussian noise and a kind of non-Gaussian noise
Noise model, is suitable for the noise characteristic under marine environment, so accurately to measure some equipment under seanoise environment
Electromagnetic radiation, need seek a kind of new modification method to reduce the influence of noise.
Modification method, document are measured for electromagnetic radiation intensity《Frequency spectrograph measures the application study of low level signal》(the Qin
Application study [J] electronic surveyings and instrument journal, 2009,23 (s1) along friend frequency spectrographs measurement low level signal:51-55.)
The method of the parameters such as the suitable spectrum analyzer rf attenuation of research equipment, resolution bandwidth and video bandwidth, improves and improves
Low level signal measurement accuracy, document《Accurate signal power measurement is carried out with frequency spectrograph》(Chen Feng are carried out accurately with frequency spectrograph
Signal power measurement [J] Electronic Design applications, 2009 (8):80-83.) mainly analysis spectrum analyzer is each from principle
The influence of kind of parameter setting and how correct arrange parameter, so as to obtain accurate signal power measurements, above-mentioned document
The setting of parameter during the measurement electromagnetic radiation of Main Analysis spectrum analyzer, but do not provide specific modification method.
The content of the invention
For the deficiencies in the prior art, the invention provides the electromagnetic radiation under a kind of environment based on seanoise
Modification method is measured, this method accurately calculates seanoise modifying factor by Bimodal Noise model, realizes seanoise
Electromagnetic radiation is accurately measured under environment.
Technical proposal that the invention solves the above-mentioned problems comprises the following steps：
Step 1) the resolution belt width values that are set according to spectrum analyzer, calculate seanoise with Bimodal Noise model and repair
Positive divisor；
Step 2) according to step 1) signal power that obtained seanoise modifying factor and measurement are obtained, calculate signal
Power actual value；
Step 3) according to step 2) obtained signal power actual value, with reference to measurement antenna parameter, calculate revised
Electromagnetic radiation intensity.
The step 1) in, the resolution belt width values set according to spectrum analyzer are calculated with Bimodal Noise model and gone to sea
The foreign noise correction factor, the expression formula of seanoise modifying factor is：
Wherein, CpSeanoise modifying factor is represented, unit is dBm, and B determines the amplitude of vibration item, σ2Represent Gaussian component
Variance, RBW represents spectrum analyzer intermediate-frequency filter resolution bandwidth, and unit is KHz,Represent that Bimodal Noise is put down
Equal power,Function representation spectrum analyzer unit impulse response function.
The step 2) in, according to step 1) signal power that obtained ocean modifying factor and measurement are obtained, calculate
Signal power actual value, signal power actual value is：
Wherein, S represents signal power actual value, and unit is dBm, SNMeasured signal power value is represented, unit is dBm, CPTable
Show signal power correction value, unit is dBm.
The step 3) in, according to step 2) obtained signal power actual value, with reference to measurement antenna parameter, calculate
Revised electromagnetic radiation intensity, the electromagnetic radiation intensity after amendment is：
Wherein, what e was represented is the electromagnetic radiation intensity after correcting, and unit is V/m, and S represents signal power actual value, single
Position is dBm, and what AF was represented is antenna factor, and unit is dB/m, ARFWhat is represented is cable loss, and unit is dB, and Z represents radio frequency electrical
Cable impedance, unit is Ω.
The beneficial effects of the invention are as follows：
Under seanoise environment, noise influences very big to electromagnetic radiation measuring value, and there is presently no a kind of effective
Solution improves the electromagnetic radiation measuring degree of accuracy, and patent of the present invention is considered makes an uproar in spectrum analyzer measurement electromagnetic radiation environment
The characteristics of sound, modifying factor, this method pair are directly calculated with the impulse response function of Bimodal Noise model and spectrum analyzer
Electromagnetic radiation is accurately measured, environmental protection and the healthy of people have great reference value, with good social benefit.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.The present embodiment is with this hair
It is lower premised on bright content to carry out, detailed implementation steps are given, but the protection domain of invention is not limited to following embodiments.
Sample plot point selection of the present invention is in marine environment, and objective for implementation is domestic general WCDMA signals of communication, in experiment
Major experimental instrument is An Nuoni reception antennas HyperLOG60180 and spectrum analyzer AT6030D, WCDMA centre frequency
And spectrum analyzer parameter setting is as shown in table 1.
The spectrum analyzer parameter setting of table 1
Electromagnetic radiation measuring modification method under a kind of environment based on seanoise of the present invention, comprises the following steps：
Step 1) the resolution belt width values that are set according to spectrum analyzer, calculate seanoise with Bimodal Noise model and repair
Positive divisor；
Step 2) according to step 1) signal power that obtained seanoise modifying factor and measurement are obtained, calculate signal
Power actual value；
Step 3) according to step 2) obtained signal power actual value, with reference to measurement antenna parameter, calculate revised
Electromagnetic radiation intensity.
The step 1) in, the resolution belt width values set according to spectrum analyzer are calculated with Bimodal Noise model and gone to sea
The foreign noise correction factor, the expression formula of seanoise modifying factor is：
Wherein, CpSeanoise modifying factor is represented, unit is dBm, σ2Represent in the variance of Gaussian component, the present embodiment
For 0.042, it is 1.9 σ that B, which determines to vibrate in the amplitude of item, the present embodiment, and RBW represents intermediate-frequency filter resolution bandwidth, and unit is
It is 30KHz in KHz, the present embodiment,Bimodal Noise mean power is represented,Function representation frequency spectrum
The unit impulse response function of analyzer, according to parameter above, seanoise modifying factor is specifically calculated as follows：
The step 2) in, according to step 1) the obtained signal power of obtained seanoise modifying factor and measurement, meter
Signal power actual value is calculated, signal power actual value is：
Wherein, S represents signal power actual value, and unit is dBm, SNSignal measurement performance number is represented, unit is dBm, CPTable
Show signal power correction value, unit is dBm.
Pass through signal power measurement value S in the implementation caseNFor -27.66dBm, and step 1) calculate obtained signal
Power correction value CPFor -28.44dBm, then can obtain signal power actual value S is：
The step 3) in, according to step 2) obtained signal power actual value, with reference to measurement antenna parameter, calculate
Revised electromagnetic radiation intensity is：
Wherein, what e was represented is revised electromagnetic radiation intensity, and unit is V/m, and S represents actual signal power value, unit
It is -35.50dBm for dBm, in the present embodiment, AF represents antenna factor, it in dB/m, the present embodiment is 36.84dB/m that unit, which is,
ARFCable loss is represented, it is 3dB in dB, the present embodiment that unit, which is, Z represents radio-frequency cable impedance, during unit is Ω, the present embodiment
For 50 Ω, can calculate electromagnetic radiation intensity after amendment is：
The electromagnetic radiation measuring amendment under a kind of environment based on seanoise proposed by the present invention is can be seen that from data
Method is effective.
Claims (4)
1. the electromagnetic radiation measuring modification method under a kind of environment based on seanoise, it is characterised in that comprise the following steps：
Step 1) the resolution belt width values that are set according to spectrum analyzer, calculate seanoise modifying factor with Bimodal Noise model
Son；
Step 2) according to step 1) signal power that obtained seanoise modifying factor and measurement are obtained, calculate signal power
Actual value；
Step 3) according to step 2) obtained signal power actual value, with reference to measurement antenna parameter, calculate revised electromagnetism
Radiation intensity.
2. the electromagnetic radiation measuring modification method under a kind of environment based on seanoise according to claim 1, its feature
It is, in the step 1, the expression formula of seanoise modifying factor is：
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Wherein, CpSeanoise modifying factor is represented, unit is dBm, and B determines the amplitude of vibration item, σ2Represent the side of Gaussian component
Difference, RBW represents spectrum analyzer intermediate-frequency filter resolution bandwidth, and unit is KHz,Represent the average work(of Bimodal Noise
Rate,Represent spectrum analyzer unit impulse response function.
3. the electromagnetic radiation measuring modification method under a kind of environment based on seanoise according to claim 1, its feature
It is, in the step 2, signal power actual value is：
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Wherein, S represents signal power actual value, and unit is dBm, SNMeasured signal power value is represented, unit is dBm, CPRepresent letter
Number power correction value, unit is dBm.
4. the electromagnetic radiation measuring modification method under a kind of environment based on seanoise according to claim 1, its feature
It is, in the step 3, revised electromagnetic radiation intensity is：
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Wherein, e represents revised electromagnetic radiation intensity, and unit is V/m, and S represents signal power actual value, and unit is dBm, AF
Antenna factor is represented, unit is dB/m, ARFCable loss is represented, unit is dB, and Z represents radio-frequency cable impedance, and unit is Ω.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111198347A (en) * | 2020-01-08 | 2020-05-26 | 杭州电子科技大学 | Passive noise testing method for magnetic sensor |
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Cited By (1)
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| CN111198347A (en) * | 2020-01-08 | 2020-05-26 | 杭州电子科技大学 | Passive noise testing method for magnetic sensor |
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