CN103207322A - Method for background noise removal by electromagnetic measuring technology - Google Patents

Method for background noise removal by electromagnetic measuring technology Download PDF

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CN103207322A
CN103207322A CN2013100712088A CN201310071208A CN103207322A CN 103207322 A CN103207322 A CN 103207322A CN 2013100712088 A CN2013100712088 A CN 2013100712088A CN 201310071208 A CN201310071208 A CN 201310071208A CN 103207322 A CN103207322 A CN 103207322A
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field intensity
electromagnetic
test
radiation source
measuring
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CN103207322B (en
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邹澎
马力
刘平
周晓平
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Zhengzhou University
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Zhengzhou University
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Abstract

The invention particularly relates to a method for background noise removal by an electromagnetic measuring technology. The method belongs to the technical field of the electromagnetic environment detection and comprises synchronously performing electromagnetic radiation field intensity detection on different detection points along the same direction of radiation source through a detection system which is formed by three same detecting devices; measuring comprehensive field intensity of electromagnetic radiation field intensity and noise field intensity; utilizing a data processing program of the detection system to obtain noise field intensity; and calculating electromagnetic radiation field intensity after noise is eliminated. Accordingly, the method for the background noise removal by the electromagnetic measuring technology has the advantages of enabling measuring results to be accurate and guaranteeing accurate and reliable electromagnetic radiation environmental assessments.

Description

Utilize Techniques in Electromagnetic Measurement to remove the method for ground unrest
Technical field:
The invention belongs to electromagnetic environment detection technique field, be specifically related to a kind of method of utilizing Techniques in Electromagnetic Measurement to remove ground unrest.
Background technology:
Measure electromagnetic radiation, generally use measuring receiver or the spectrum analyzer through calibrating.These all are frequency-selecting equipment, and for example near the electromagnetic environment of measuring a certain large-scale electromagnetic radiation source, when a certain frequency measurement, the homogenous frequency signal in the ground unrest is very big to the accuracy influence of measurement result.This ground unrest disturbs identical with the frequency of equipment under test electromagnetic radiation, and measuring receiver or spectrum analyzer are to identify and to distinguish which is ground unrest on earth, and which is the electromagnetic radiation of equipment under test.Therefore, utilizing the measured result of measuring receiver or spectrum analyzer all is the electromagnetic radiation of tested radiation source and the comprehensive field intensity of ground unrest, can't measure the electromagnetic radiation field intensity of tested radiation source accurately.
At present, the influence owing to peripheral background electromagnetic noise is all found to have in domestic many places when doing ultra-high-tension power transmission line electromagnetic radiation environment influence evaluation, and measurement result surpasses the phenomenon of national standard.In this case, utilize existing measuring equipment and technology just can't determine tested ultra-high-tension power transmission line to the influence of electromagnetic radiation environment, bring very big difficulty for electromagnetic radiation environment impact assessment and management.
Summary of the invention:
In sum, in order to overcome the deficiency of prior art problem, the invention provides a kind of method of utilizing Techniques in Electromagnetic Measurement to remove ground unrest, it is by the identical checkout equipment of three covers, same direction along radiation source, electromagnetic radiation field intensity to different check points detects synchronously, measure the comprehensive field intensity of electromagnetic radiation field intensity and noise field intensity, then by calculating, draw noise field intensity, be eliminated at last electromagnetic radiation field intensity behind the noise, thus make measurement result accurate, guarantee that electromagnetic radiation environment estimates accurately and reliably.
For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that
A kind of method of utilizing Techniques in Electromagnetic Measurement to remove ground unrest, wherein: it comprises following processing step:
The first step: setting ground unrest is at random, uncorrelated with measured signal; And noise source range observation zone is far, and the electric field intensity of noise each point in measured zone is approximate to be uniform;
Second step: in measured zone, along a certain direction of tested radiation source 3 test point P are set 1, P 2, P 3
The 3rd step: the identical measuring equipment of configuration three covers, every cover measuring equipment comprise the measuring receiver of corresponding band or through the spectrum analyzer of calibration, receiving antenna and the identical cable of corresponding band;
The 4th step: utilize the identical measuring equipment of three covers, synchro measure P 1, P 2, P 3The comprehensive field intensity E of the tested radiation field intensity of three test points and background noise field strength stack 1, E 2, E 3, measure P 1, P 2, P 3Distance R between three test points and the tested radiation source 1, R 2, R 3
The 5th step: setting measured signal is E in the field intensity of test point Si, wherein: i is test point, then P 1, P 2, P 3The tested radiation field intensity of three test points is respectively E S1, E S2, E S3, set P 1, P 2, P 3The background noise field strength of three test points is E NThen:
E S 1 2 + E N 2 = E 1 2 E S 2 2 + E N 2 = E 2 2 E S 3 2 + E N 2 = E 3 2 - - - ( 1 )
The 6th step: by formula E si = KR i - m - - - ( 2 )
In the formula: K---be the field intensity coefficient of being determined by the parameter of radiation source;
M---be electromagnetic radiation field strength attenuation index;
E Si---be the field intensity of measured signal in test point;
Ri---be the distance between test point and the tested radiation source;
Formula (2) substitution formula (1) is drawn:
K 2 R 1 - 2 m = E 1 2 - E N 2
K 2 R 2 - 2 m = E 2 2 - E N 2
K 2 R 3 - 2 m = E 3 2 - E N 2 - - - ( 3 )
Can be derived by formula (3):
( R 1 R 2 ) 2 m = E 2 2 - E N 2 E 1 2 - E N 2
( R 1 R 3 ) 2 m = E 3 2 - E N 2 E 1 2 - E N 2 - - - ( 4 )
Can obtain m and E by following formula N, with E NSubstitution formula (1) can be obtained E S1, E S2, E S3
The 7th the step: storage of measurement data, utilize the Computer Processing measurement data, output measurement result, comprise E S1, E S2, E S3, background noise field strength E NWith electromagnetic radiation field strength attenuation exponent m.
Technical scheme of the present invention can also be achieved in that in second step, if tested radiation source is point source, then along on a certain directions of rays centered by point source three test points being set; If tested radiation source is for being the beta radiation source, then along the direction perpendicular to the beta radiation source three test points are set.
Technical scheme of the present invention can also be achieved in that in the 3rd step that receiver and antenna will will have calibration data accurately at test frequency through calibration; Measure the pad value of cable at test frequency.
Technical scheme of the present invention can also be achieved in that in the 4th step, the P of detection 1, P 2, P 3The comprehensive field intensity E of three test points 1, E 2, E 3For having counted receiver, the calibration factor of antenna, the loss of cable and the measured value after the measuring error between three complete equipments.
Technical scheme of the present invention can also be achieved in that in the 4th step, in order to make three cover measuring equipments at test point P 1, P 2, P 3Place's synchro measure radiation field intensity connects into a measuring system to three cover measuring equipments by GP-IB interface and IEEE-488 bus, by the synchro measure of computer control three complete equipments.
Beneficial effect of the present invention is:
1, the present invention is by the identical checkout equipment of three covers, same direction along radiation source, synchronously different check points being carried out the electromagnetic radiation field intensity detects, measure the comprehensive field intensity of electromagnetic radiation field intensity and noise field intensity, by calculating, draw noise field intensity then, calculate the electromagnetic radiation field intensity of eliminating behind the noise at last, thereby make measurement result accurate, guarantee the electromagnetic radiation environment evaluation accurately and reliably.
2, the present invention can draw electromagnetic radiation field intensity comparatively accurately, eliminates ground unrest to the influence of electromagnetic radiation testing result, for the accuracy of electromagnetic radiation testing result and the reliability of electromagnetic radiation environment evaluation provide technical support.
Description of drawings:
Fig. 1 arranges the synoptic diagram of check point to point source for the present invention;
Fig. 2 arranges the synoptic diagram of check point to the beta radiation source for the present invention;
Fig. 3 is the measuring system synoptic diagram for the present invention.
Fig. 4 is flow chart of data processing figure of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Shown in Fig. 1,2,3,4, in electromagnetic radiation environment detects, eliminate the method for ground unrest, comprise following processing step:
The first step: setting ground unrest is at random, uncorrelated with measured signal; And noise source range observation zone is far, and the electric field intensity of noise each point in measured zone is approximate to be uniform.
Second step: in measured zone, along a certain direction of tested radiation source 3 test point P are set 1, P 2, P 3As shown in Figure 2, ultra-high-tension power transmission line belongs to the beta radiation source, so P 1, P 2, P 3Along the direction setting perpendicular to ultra-high-tension power transmission line.When needs detect point source, adopt method as shown in Figure 1 that three test points are set.
The 3rd step: the identical measuring equipment of configuration three covers, every cover measuring equipment comprises the measuring receiver of corresponding band, receiving antenna and the identical cable of corresponding band; Receiver and antenna will will have calibration data accurately at test frequency through calibration; Measure the pad value of cable at test frequency.
The 4th step: utilize the identical measuring equipment of three covers, synchro measure P 1, P 2, P 3The comprehensive field intensity of the tested radiation field intensity of three test points and background noise field strength stack.E for example 1=1.02V/m, E 2=0.3572V/m, E 3=0.2358V/m, E 1, E 2, E 3For having counted receiver, the calibration factor of antenna, the loss of cable and the measured value after the measuring error between three complete equipments; Measure P 1, P 2, P 3Distance R between three test points and the tested radiation source 1=10m, R 2=15m, R 3=20m is for guaranteeing that three cover measuring equipments are at test point P 1, P 2, P 3Place's synchro measure radiation field intensity connects into a measuring system to three cover measuring equipments by GP-IB interface and IEEE-488 bus, by the synchro measure of computer control three complete equipments.Measuring system as shown in Figure 3.
The 5th step: setting measured signal is E in the field intensity of test point Si, wherein: i is test point, then P 1, P 2, P 3The tested radiation field intensity of three test points is respectively E S1, E S2, E S3, set P 1, P 2, P 3The background noise field strength of three test points is E NThen:
E S 1 2 + E N 2 = E 1 2 E S 2 2 + E N 2 = E 2 2 E S 3 2 + E N 2 = E 3 2 - - - ( 1 )
The 6th step: by formula E si = KR i - m - - - ( 2 )
In the formula:
K---be the field intensity coefficient of being determined by the parameter of radiation source;
M---be electromagnetic radiation field strength attenuation index;
E Si---be the field intensity of measured signal in test point;
Ri---be the distance between test point and the tested radiation source;
Formula (2) substitution formula (1) is drawn:
K 2 R 1 - 2 m = E 1 2 - E N 2
K 2 R 2 - 2 m = E 2 2 - E N 2
K 2 R 3 - 2 m = E 3 2 - E N 2 - - - ( 3 )
Can be derived by formula (3):
( R 1 R 2 ) 2 m = E 2 2 - E N 2 E 1 2 - E N 2
( R 1 R 3 ) 2 m = E 3 2 - E N 2 E 1 2 - E N 2 - - - ( 4 )
With measurement data E 1=1.02V/m, E 2=0.3572V/m, E 3=0.2358V/m, R 1=10m, R 2=15m, R 3=20m, substitution formula (4) can draw:
0.67 2 m = 0.1276 - E N 2 1.04 - E N 2
0 . 5 2 m = 0 . 0556 - E N 2 1.04 - E N 2
Can obtain E by following formula N≈ 0.203V, m ≈ 3,, with E NSubstitution formula (1) can be obtained E S1≈ 1V/m, E S2≈ 0.294V/m, E S3≈ 0.12V/m.
The 7th the step: storage of measurement data, utilize the Computer Processing measurement data, output measurement result, comprise E S1, E S2, E S3, background noise field strength E NWith electromagnetic radiation field strength attenuation exponent m.The function of Computer Processing measurement data is as follows:
⑴ receive three cover measuring equipments at test point P 1, P 2, P 3The signal voltage of place's synchro measure.
⑵ utilize calibration factor, the loss of cable and the calibration error between three complete equipments of the antenna of storage, calculates at test point P 1, P 2, P 3The combined radiation field intensity E of place's synchro measure 1, E 2, E 3
⑶ utilize in-site measurement data R 1, R 2, R 3And E 1, E 2, E 3Calculate the electromagnetic radiation field intensity E that radiation source produces in each test point 1S, E 2S, E 3S
⑷ storage and output measurement result comprise E 1S, E 2S, E 3S, background noise field strength E NWith electromagnetic radiation field strength attenuation exponent m.
Need to prove, the above embodiment is to the explanation of technical solution of the present invention and unrestricted, other modification that is equal to replacement or makes according to prior art of affiliated technical field those of ordinary skill, as long as do not exceed thinking and the scope of technical solution of the present invention, all should be included within the interest field of the presently claimed invention.

Claims (5)

1. method of utilizing Techniques in Electromagnetic Measurement to remove ground unrest, it is characterized in that: it comprises following processing step:
The first step: setting ground unrest is at random, uncorrelated with measured signal; And noise source range observation zone is far, and the electric field intensity of noise each point in measured zone is approximate to be uniform;
Second step: in measured zone, along a certain direction of tested radiation source 3 test point P are set 1, P 2, P 3
The 3rd step: the identical measuring equipment of configuration three covers, every cover measuring equipment comprise the measuring receiver of corresponding band or through the spectrum analyzer of calibration, receiving antenna and the identical cable of corresponding band;
The 4th step: utilize the identical measuring equipment of three covers, synchro measure P 1, P 2, P 3The comprehensive field intensity E of the tested radiation field intensity of three test points and background noise field strength stack 1, E 2, E 3, measure P 1, P 2, P 3Distance R between three test points and the tested radiation source 1, R 2, R 3
The 5th step: setting measured signal is E in the field intensity of test point Si, wherein: i is test point, then P 1, P 2, P 3The tested radiation field intensity of three test points is respectively E S1, E S2, E S3, set P 1, P 2, P 3The background noise field strength of three test points is E NThen:
Figure 963864DEST_PATH_IMAGE002
The 6th step: by formula
Figure 2013100712088100001DEST_PATH_IMAGE003
(2)
In the formula: K---be the field intensity coefficient of being determined by the parameter of radiation source;
M---be electromagnetic radiation field strength attenuation index;
E Si---be the field intensity of measured signal in test point;
Ri---be the distance between test point and the tested radiation source;
Formula (2) substitution formula (1) is drawn:
Figure 2013100712088100001DEST_PATH_IMAGE005
Can be derived by formula (3):
Figure 2013100712088100001DEST_PATH_IMAGE007
Can obtain m and E by following formula N, with E NSubstitution formula (1) can be obtained E S1, E S2, E S3
The 7th the step: storage of measurement data, utilize the Computer Processing measurement data, output measurement result, comprise E S1, E S2, E S3, background noise field strength E NWith electromagnetic radiation field strength attenuation exponent m.
2. the method for utilizing Techniques in Electromagnetic Measurement to remove ground unrest according to claim 1 is characterized in that: in second step, if tested radiation source is point source, then along on a certain directions of rays centered by point source three test points being set; If tested radiation source is for being the beta radiation source, then along the direction perpendicular to the beta radiation source three test points are set.
3. the method for utilizing Techniques in Electromagnetic Measurement to remove ground unrest according to claim 1, it is characterized in that: in the 3rd step, receiver and antenna will will have calibration data accurately at test frequency through calibration; Measure the pad value of cable at test frequency.
4. the method for utilizing Techniques in Electromagnetic Measurement to remove ground unrest according to claim 1 is characterized in that: in the 4th step, and the P of detection 1, P 2, P 3The comprehensive field intensity E of three test points 1, E 2, E 3For having counted receiver, the calibration factor of antenna, the loss of cable and the measured value after the measuring error between three complete equipments.
5. the method for utilizing Techniques in Electromagnetic Measurement to remove ground unrest according to claim 1 is characterized in that: in the 4th step, in order to make three cover measuring equipments at test point P 1, P 2, P 3Place's synchro measure radiation field intensity connects into a measuring system to three cover measuring equipments by GP-IB interface and IEEE-488 bus, by the synchro measure of computer control three complete equipments.
CN201310071208.8A 2013-03-06 2013-03-06 Techniques in Electromagnetic Measurement is utilized to remove the method for ground unrest Expired - Fee Related CN103207322B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106130673A (en) * 2016-08-26 2016-11-16 北京森馥科技股份有限公司 The monitoring method of mobile communication base station electromagnetic radiation
CN107167670A (en) * 2017-06-13 2017-09-15 湘潭大学 A kind of electromagnetic radiation measuring modification method based under impulse noise environment
CN113644997A (en) * 2021-10-14 2021-11-12 中国民用航空总局第二研究所 Electromagnetic environment detection method, device and system

Citations (2)

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JP2001343409A (en) * 2000-06-01 2001-12-14 Sony Corp Electromagnetic radiation measuring apparatus and method
CN202093100U (en) * 2011-04-07 2011-12-28 周莹 Electromagnetic radiation measurement instrument and electromagnetic radiation monitoring system

Patent Citations (2)

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JP2001343409A (en) * 2000-06-01 2001-12-14 Sony Corp Electromagnetic radiation measuring apparatus and method
CN202093100U (en) * 2011-04-07 2011-12-28 周莹 Electromagnetic radiation measurement instrument and electromagnetic radiation monitoring system

Non-Patent Citations (1)

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Title
王旋等: "去除电磁辐射测量信号中同频背景噪声的研究", 《电测与仪表》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106130673A (en) * 2016-08-26 2016-11-16 北京森馥科技股份有限公司 The monitoring method of mobile communication base station electromagnetic radiation
CN106130673B (en) * 2016-08-26 2019-05-17 北京森馥科技股份有限公司 The monitoring method of mobile communication base station electromagnetic radiation
CN107167670A (en) * 2017-06-13 2017-09-15 湘潭大学 A kind of electromagnetic radiation measuring modification method based under impulse noise environment
CN107167670B (en) * 2017-06-13 2019-08-23 湘潭大学 A kind of electromagnetic radiation measuring modification method based under impulse noise environment
CN113644997A (en) * 2021-10-14 2021-11-12 中国民用航空总局第二研究所 Electromagnetic environment detection method, device and system

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