CN102419428A - Integral calibrating method of radio interference measuring device - Google Patents
Integral calibrating method of radio interference measuring device Download PDFInfo
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- CN102419428A CN102419428A CN2011102689104A CN201110268910A CN102419428A CN 102419428 A CN102419428 A CN 102419428A CN 2011102689104 A CN2011102689104 A CN 2011102689104A CN 201110268910 A CN201110268910 A CN 201110268910A CN 102419428 A CN102419428 A CN 102419428A
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Abstract
The invention relates to an integral calibrating method of a radio interference measuring device. The integral calibrating method comprises the steps of: firstly, tracing from a national radio metering basic standard; determining measurement uncertainty of a radio field intensity indicator by separate calibration and combination of uncertainties of a standard receiving antenna and a standard radio interference receiver; establishing a standard device of the radio interference measuring device; and furthermore, performing integral calibration by using a comparison method or a substitution method. Proved by the comparison of data obtained by calibration, the method is higher in accuracy, and applicable to the integral calibration of the radio interference measuring device in the future power transmission and transformation project.
Description
Technical field
The invention belongs to high voltage power transmission and transforming engineering electromagnetic environment field, is a kind of complete calibration method of radio interference measurement mechanism specifically.
Background technology
Power transformating and supplying facility is the indispensable equipment of modern industrial society, and meeting produces high-voltage corona and radio interference but they are in operation, and influences the people's live and work.In recent years, took place frequently throughout the country electromagnetism environmental issues such as the disturbing effect initiation of various radio stations to be complained and dispute, and brought difficulty not only for the construction of electrical network, and had a strong impact on the safe operation of electrical network because of power transformating and supplying facility.The environmental impact assessment of project of transmitting and converting electricity has been included in the engineering construction legal procedure; But still lack unified calibrating installation for measuring equipment at present; So that the data difference that many monitoring units provide is bigger; Cause the distrust of the public easily, also cause the engineering dispute because of inaccurate measurement result easily measurement result.In order to realize the value unification of radio interference measurement, strengthen control and improvement to radio interference, be necessary to set up unified radio interference measurement mechanism calibration system, the unification that realizes radio interference measurement mechanism value is with accurate.
The corona of transmission line of electricity can send radiowave, and the wavelength coverage of this radiowave is very wide, covers the radio wave bands such as medium wave, shortwave and ultrashort wave (USW) from 10kHz to 300MHz.Present measuring method is to adopt radio-instruments such as radio interference measuring instrument, high frequency and ultrahigh frequency field intensity appearance to measure the field intensity of each frequency range.
In order to reduce the influence of environment electromagnetic noise to instrument calibration; The calibration of these radio signal surveying instruments (comprising receiving antenna) or calibrating need be indoor at the screening experiment of special use, calibrate respectively or examine and determine according to the codes and standards of Radio Interference Measuring System.But when carrying out actual radio interference measurement, receiving antenna and radio interference receiver are to need the supporting surveying work that carries out simultaneously, and still lack the complete calibration method to this a whole set of radio interference measurement mechanism at present.
Summary of the invention
The objective of the invention is the 150kHz～300MHz radio wave band radio field intensity and the radiosity surveying instrument that had carried out qualification test by the country and the industry standard of electric field or magnetic field antenna and radio interference receiver based on, a kind of radio interference measurement mechanism complete calibration method of simultaneously antenna and radio interference receiver being formed is provided.
To achieve these goals, the method that the present invention adopted is:
The complete calibration method of radio interference measurement mechanism; Its method is: at first trace to the source from national radio measure base standard; Uncertainty through split calibration and combined standard receiving antenna and standard radio interference receiver; Confirm the uncertainty of measurement of radio field intensity appearance, set up the standard set-up of radio interference measurement mechanism, and then carry out piece calibration through relative method or method of substitution.
Its concrete steps are:
First step: the value of radio interference measurement mechanism is traced to the source from the radio measure base standard; The antenna of preserving as laboratory standard; Comprise coil antenna and the flagpole antenna of measuring long wave and medium wave; The ultrashort dipole antenna of flagpole antenna, doublet antenna and measurement of measuring shortwave send the radio standard laboratory verification, confirms the transmission coefficient and the impedance of antenna;
Second step: send the radio standard laboratory verification receiver, spectrum analyzer, standard signal generator, standard attenuator, the digital voltmeter preserved as laboratory standard simultaneously, confirm the scale factor and the accuracy of measurement of these reference instruments;
Third step: through the uncertainty of split calibration and combined standard receiving antenna and standard radio interference receiver, confirm the uncertainty of measurement of radio field intensity appearance, set up the standard set-up of radio interference measurement mechanism on this basis;
The 4th step: through relative method or method of substitution; The receiving antenna of standard radio frequency field strength measurement device with inserted calibration by the receiving antenna of school Radio Interference Measuring System and use radio frequency electromagnetic field; Relatively obtain by the measuring error of school interferometer after their the measurement indicating value, thereby accomplish piece calibration the radio interference measurement mechanism of antenna and radio interference receiver composition.
For the antenna of needs calibration,, and in fully anechoic chamber, calibrate with reference to the calibration method of national metrological verification regulations JJG 611 " RR3 type interference field strength measuring instrument " about antenna.To the receiver of needs calibration, then calibrate by national metering technology normalized JJF 1173 " measuring receiver calibrating standard ".
Through the data contrast proof that calibration is obtained, the present invention has high accuracy, can be applicable to the piece calibration of project of transmitting and converting electricity radio interference measurement mechanism from now on.
Description of drawings
Fig. 1 is a radio interference measurement mechanism calibration system magnitude tracing block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made further detailed description.
Embodiment:
Present embodiment is done further detailed explanation to the calibration of far zone field radio interference measuring instrument and far zone field interference field strength appearance to the present invention based on the standard set-up of radio interference measurement mechanism.
The electromagnetic wave front in far zone field can be thought a plane, and such electromagnetic wave is called plane electromagnetic wave, i.e. the TEM ripple.The electric field E and the magnetic field H of plane electromagnetic wave have following relation:
In the following formula, Z is called the wave impedance of free space, and size is Z=120 π=377 (Ω).
Only need measure the electric field amount of plane electromagnetic wave or other amount that the magnetic field amount just can calculate electromagnetic field.Far field field intensity meter or use rod shape antenna or dipole antenna are responded to the generation signal potential through electromagnetic electric field component on antenna conductor; Or use tours antenna on tours antenna, to respond to obtain signal potential, calculate electromagnetic electric field component according to the relation in electric field and magnetic field again through electromagnetic magnetic-field component.The characteristics of far zone field are that signal intensity is low, need amplify the signal that antenna receives and could indicate its size.
(1) calibration of far zone field radio interference measuring instrument
1. 150kHz～30MHz frequency range
Used the magnetic field of the field coil generation in fully anechoic chamber and the electric field calibration that flagpole antenna produces by this frequency range of school radio interference measurement mechanism.High frequency power source output rating 100W, frequency range 100kHz～400MHz.
Because calibration field is a near field, can not or use the electric field calculating magnetic field through the magnetic field calculation electric field, so the necessary identical antenna of type of service of relative method, promptly emissive source antenna, standard field intensity meter are all coil antenna or flagpole antenna with the antenna that is used by the school interferometer.
Antenna as standard is used was calibrated through constitutional law devise a stratagem amount department; It forms the standard field intensity meter with same receiver through calibration; Error synthesis through antenna and receiver obtains the measuring error of system through the metrology method, can enough measure the electric field or the magnetic field of test product antenna position exactly.
The standard field intensity meter is made up of standard antenna and reference receiver, and the error synthesis through antenna and receiver obtains and the process piece calibration its error through the metrology method.The standard field intensity meter regularly send the calibrating of China metering institute on request, gets its certified value as the standard value.
Measuring receiver uses the standard signal generator calibration.The frequency range of standard signal generator covers radio frequency band, exports the correction signal of accurate amplitude through the standard radio frequency attenuator, obtains its error through the indicating value of receiver and the deviation of standard value.
2. 30MHz～300MHz frequency range
The calibration steps of this frequency range also be through with relatively the obtaining of standard field intensity meter by the error of school interferometer.Calibration operation can be undertaken by 5 meters methods at fully anechoic chamber, generates electromagnetic waves with the biconical antenna of a 20MHz～300MHz.The receiving antenna of Radio Interference Measuring System can be a coil antenna, can be shaft-like or doublet antenna also, between the dual-mode antenna apart from 5m, overhead the height 1m～2m.
(2) calibration of far zone field radio interference field intensity appearance
The structure of interference field strength appearance and far field field intensity meter are similar, but also have some specific functions, both energy measurement sinusoidal signal, also energy measurement impulse disturbances and level and smooth interference.In order to realize the pulse signal measurement, nonlinear detector is arranged behind intermediate frequency amplifier in addition, it is made up of the quasi-peak detector and average reading detector and first of indicating gauge has given time constant.Regulation frequency range 150kHz～30MHz Time Bandwidth 9kHz; Frequency range 30MHz～300MHz Time Bandwidth 120kHz.Also require amplification and detection circuit that thousands of times overload factor is arranged simultaneously.
Elder generation carries out piece calibration to the device of antenna and receiver composition by the far zone field measuring instrument when calibrating far zone field interference field strength appearance, then receiver section is carried out frequency response and time constant test.Use the impulse response calibrating device during calibration, produce 0.044 μ Vs pulse and the monopulse of repetition frequency 1Hz～1000Hz, in order to the disturbing pulse response of measuring receiver.
The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (2)
1. the complete calibration method of a radio interference measurement mechanism; Its method is: at first trace to the source from the radio measure base standard; Through the uncertainty of split calibration and combined standard receiving antenna and standard radio interference receiver, confirm the uncertainty of measurement of radio field intensity appearance, set up the standard set-up of radio interference measurement mechanism; And then carry out piece calibration through relative method or method of substitution
Its concrete steps are:
First step: the value of radio interference measurement mechanism is traced to the source from the radio measure base standard; The antenna of preserving as laboratory standard; Comprise coil antenna and the flagpole antenna of measuring long wave and medium wave; The ultrashort dipole antenna of flagpole antenna, doublet antenna and measurement of measuring shortwave send the radio standard laboratory verification, confirms the transmission coefficient and the impedance of antenna;
Second step: send the radio standard laboratory verification receiver, spectrum analyzer, standard signal generator, standard attenuator, the digital voltmeter preserved as laboratory standard simultaneously, confirm the scale factor and the accuracy of measurement of these reference instruments;
Third step: through the uncertainty of split calibration and combined standard receiving antenna and standard radio interference receiver, confirm the uncertainty of measurement of radio field intensity appearance, set up the standard set-up of radio interference measurement mechanism on this basis;
The 4th step: through relative method or method of substitution; The receiving antenna of standard radio frequency field strength measurement device with inserted calibration by the receiving antenna of school Radio Interference Measuring System and use radio frequency electromagnetic field; Relatively obtain by the measuring error of school interferometer after their the measurement indicating value, thereby accomplish piece calibration the radio interference measurement mechanism of antenna and radio interference receiver composition.
2. the complete calibration method of radio interference measurement mechanism as claimed in claim 1 is characterized in that: in said the 4th step
The 150kHz of far zone field radio interference measuring instrument～30MHz frequency range is used the magnetic field of the field coil generation in fully anechoic chamber and the electric field calibration that flagpole antenna produces; The antenna that the relative method type of service is identical, promptly emissive source antenna, standard field intensity meter are all coil antenna or flagpole antenna with the antenna that is used by the school interferometer; Error synthesis through antenna and receiver obtains and the process piece calibration error of standard field intensity meter through the metrology method;
The calibration steps of the 30MHz of far zone field radio interference measuring instrument～300MHz frequency range also be through with relatively the obtaining of standard field intensity meter by the error of school interferometer; Calibration operation can be undertaken by 5 meters methods at fully anechoic chamber, generates electromagnetic waves with biconical antenna; The receiving antenna of Radio Interference Measuring System can be ring-type, shaft-like or doublet antenna;
The calibration of far zone field radio interference field intensity appearance, the device to antenna and receiver composition carries out piece calibration by the far zone field measuring instrument earlier, then receiver section is carried out frequency response and time constant test; Use the impulse response calibrating device during calibration, in order to the disturbing pulse response of measuring receiver.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104569886A (en) * | 2014-12-05 | 2015-04-29 | 胡乔林 | Calibrating method for signal detection equipment based on time-frequency parameter standard instrument |
| CN107888307A (en) * | 2016-09-30 | 2018-04-06 | 中兴通讯股份有限公司 | Interference detecting method, apparatus and system, interferometry indicating means and device |
| CN108037383A (en) * | 2017-11-28 | 2018-05-15 | 南方电网科学研究院有限责任公司 | Pipe busbar radio interference test system, calibration system and test method, calibration method |
| CN113092878A (en) * | 2021-03-31 | 2021-07-09 | 北京环境特性研究所 | Test method and detection device for electromagnetic radiation of W-band environment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104569886A (en) * | 2014-12-05 | 2015-04-29 | 胡乔林 | Calibrating method for signal detection equipment based on time-frequency parameter standard instrument |
| CN104569886B (en) * | 2014-12-05 | 2019-01-25 | 胡乔林 | Signal detection apparatus calibration method based on time and frequency parameter reference instrument mode |
| CN107888307A (en) * | 2016-09-30 | 2018-04-06 | 中兴通讯股份有限公司 | Interference detecting method, apparatus and system, interferometry indicating means and device |
| CN108037383A (en) * | 2017-11-28 | 2018-05-15 | 南方电网科学研究院有限责任公司 | Pipe busbar radio interference test system, calibration system and test method, calibration method |
| CN108037383B (en) * | 2017-11-28 | 2021-04-16 | 南方电网科学研究院有限责任公司 | Tube bus radio interference test system, calibration system, test method and calibration method |
| CN113092878A (en) * | 2021-03-31 | 2021-07-09 | 北京环境特性研究所 | Test method and detection device for electromagnetic radiation of W-band environment |
| CN113092878B (en) * | 2021-03-31 | 2023-01-20 | 北京环境特性研究所 | Test method and detection device for electromagnetic radiation of W-band environment |
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Application publication date: 20120418 |