CN106597340A - Electromagnetic field sensor calibration system based on reverberation room and method thereof - Google Patents
Electromagnetic field sensor calibration system based on reverberation room and method thereof Download PDFInfo
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- CN106597340A CN106597340A CN201611128299.4A CN201611128299A CN106597340A CN 106597340 A CN106597340 A CN 106597340A CN 201611128299 A CN201611128299 A CN 201611128299A CN 106597340 A CN106597340 A CN 106597340A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The invention discloses an electromagnetic field sensor calibration system based on a reverberation room. The system comprises the reverberation room, a receiving antenna, a receiver, a stirrer, an emission antenna and an electromagnetic field signal generation device, wherein the receiving antenna is arranged in a work area of the reverberation room and is connected to an attenuation machine; the receiver is connected to the receiving antenna; the stirrer and the emission antenna are located in the reverberation room; and the electromagnetic field signal generation device is located outside the reverberation room and is connected to the emission antenna. The invention simultaneously discloses an electromagnetic field sensor calibration method based on the reverberation room. In the invention, an electromagnetic field sensor can be calibrated in a high efficiency and low cost mode; a calibration scope of an electromagnetic field sensor field intensity can be increased; and electromagnetic field sensor calibration under a 1000V/m field intensity environment can be realized.
Description
Technical field
The present invention relates to emf sensor calibration field.Pass more particularly, to a kind of electromagnetic field based on reverberation chamber
Sensor calibration system and method.
Background technology
Field intensity is one of wireless basic parameter, and emf sensor is the common equipment for measuring field intensity.Standard field intensity
The grinding of environment is built and the calibration of emf sensor is always a developing direction of domestic and international metrological service.Because electromagnetic field is passed
Sensor nominal field strength measurement range can reach 1000V/m, and at present country's Field strength calibration ability can only achieve 200V/m (1GHz
With super band), therefore how to realize that the calibration of the emf sensor under more high-amplitude field intensity environment becomes emf sensor school
One of developing direction of quasi- technology.
It is International Electrical Electronic Engineering Association that traditional emf sensor calibrates the main standard of foundation in the world
(IEEE) the IEEE Std 1309-2005 that electromagnetic compatibility branch promulgates《IEEE Standard for calibration of
electromagnetic field sensors and probes,excluding antennas,from9kHz to
40GHz》.The standard describes nine kinds of field intensity production methods in different frequency range to different field intensity types and action scope, is electromagnetic field
The calibration of sensor provides standard field intensity environment.The calibration of 1GHz～40GHz frequency range emf sensors is generally adopted to be included
The microwave dark room of pyramidal horn antenna, the structure of the calibration system is as shown in Figure 1.
Microwave signal is generated standard electromagnetic field intensity environment by the method by pyramidal horn antenna in microwave dark room, is realized
The calibration of electromagnetic field intensity sensor.In actual use the method has inconvenience.First of all for realizing 1GHz～18Ghz
The calibration of frequency range emf sensor, needs to use eight different pyramidal horn antennas to cover full frequency band, changes aerial band and comes
It is operational it is loaded down with trivial details with it is inconvenient；Secondly in order to realize 200V/m field intensity environment under emf sensor calibration, need to use
200W power amplifiers；Last the method must be carried out in the microwave dark room of function admirable.Comprehensive as above factor, using including
The microwave dark room of pyramidal horn antenna carries out the calibration of emf sensor, both inconvenient, and cost is again high, and the field intensity model calibrated
Enclosing can only be in below 200V/m.
Accordingly, it is desirable to provide a kind of emf sensor calibration system and method based on reverberation chamber, efficiently low to realize
Cost is calibrated to emf sensor, and improves the calibration range of emf sensor field intensity.
The content of the invention
The invention solves the problems that a technical problem be to provide a kind of emf sensor calibration system based on reverberation chamber,
The invention solves the problems that another technical problem be to provide a kind of emf sensor calibration steps based on reverberation chamber, with realize
Calibrating to emf sensor for high efficiency, low cost, improves the calibration range of emf sensor field intensity.
To solve above-mentioned technical problem, the present invention adopts following technical proposals：
One aspect of the present invention discloses a kind of emf sensor calibration system based on reverberation chamber, it is characterised in that institute
The system of stating includes：
Reverberation chamber；
It is placed in the reception antenna that working region in the reverberation room is connected with decay machine；
The receiver being connected with the reception antenna；
Agitator and transmitting antenna in the reverberation room；With
The electromagnetic field signal generating meanss being connected with the transmitting antenna outside the reverberation room.
Preferably, the electromagnetic field signal generating meanss include signal generator, power amplifier and the work(being sequentially connected
Rate monitoring subsystem, the power monitoring subsystem is connected with the transmitting antenna.
Preferably, the power monitoring subsystem includes directional coupler, attenuator, energy meter or power sensitive device, institute
State directional coupler to be connected respectively with the power amplifier and the transmitting antenna.
Preferably, the output of the power amplifier is in below 200W.
Preferably, the frequency range coverage of the system be 1GHz～18GHz, field intensity amplitude coverage be 5V/m～
1000V/m。
Preferably, the length and width of the reverberation chamber and height are less than 2m.
Another aspect of the present invention also discloses a kind of emf sensor calibration steps based on reverberation chamber, and its feature exists
In methods described includes：
S1：The electromagnetic field of standard field intensity is produced in reverberation room by electromagnetic field signal generating meanss, by reception antenna with
The emf sensor calibrated through microwave dark room is put in reverberation room；
S2：Adjust the field intensity of electromagnetic field and field intensity value of the emf sensor when microwave dark room is calibrated in the reverberation room
It is identical, calculate the reference antenna coefficient of the reception antenna；
S3：Emf sensor to be calibrated is replaced into the emf sensor, by field intensity pair in adjustment reverberation chamber
The emf sensor to be calibrated is calibrated.
Preferably, the reference antenna coefficient is
AF=P1-E1+IL+107
Wherein, P1For the mean power of reception antenna, E1For field intensity value of the emf sensor when microwave dark room is calibrated,
IL is cable waste.
Preferably, the S3 includes：
S31：Field intensity after adjustment is calculated according to the reference antenna coefficient of the reception antenna；Field intensity after the adjustment is
E2=P2+AF+IL+107
Wherein, E2For the field intensity of emf sensor position to be calibrated, P2For the mean power of reception antenna；AF is to connect
The reference antenna coefficient of antenna is received, IL is cable waste；
S32：Field intensity after adjustment is calculated field intensity amendment with the instruction field intensity value of emf sensor to be calibrated
Factor pair emf sensor to be calibrated is corrected, and the field intensity modifying factor is
Wherein, E2For the field intensity of emf sensor position to be calibrated, E3For the average of emf sensor to be calibrated
Field intensity indicated value.
Beneficial effects of the present invention are as follows：
The present invention is proposed based on the emf sensor calibration steps of reverberation chamber, with the microwave including pyramidal horn antenna
Darkroom method compares, and the present invention need not use dark room conditions.The micro- of 200V/m field intensity is equally produced in 1GHz～18GHz frequency ranges
Ripple darkroom method needs 200W power amplifiers, and the present invention only needs to the power amplifier of 20W, and the present invention significantly reduces school
Quasi- cost.Using the power amplifier of 200W, microwave dark room method cannot realize that the electromagnetic field under more than 200V/m field intensity environment is passed
Sensor is calibrated, and the present invention can realize the emf sensor calibration under 1000V/m field intensity environment.
Description of the drawings
The specific embodiment of the present invention is described in further detail below in conjunction with the accompanying drawings.
Fig. 1 illustrates that prior art includes the structure of the microwave dark room emf sensor calibration system of pyramidal horn antenna
Schematic diagram.
Fig. 2 illustrates a kind of structural representation of the emf sensor calibration system based on reverberation chamber of the present invention.
Fig. 3 illustrates a kind of flow chart of the emf sensor calibration steps based on reverberation chamber of the present invention.
Specific embodiment
In order to be illustrated more clearly that the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar part is indicated with identical reference in accompanying drawing.It will be appreciated by those skilled in the art that below institute is concrete
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Fig. 2 one aspect of the present invention discloses a kind of emf sensor calibration system based on reverberation chamber, it is described
System includes：Reverberation chamber, the reception antenna for being connected with decay machine, agitator, transmitting antenna, electromagnetic field signal generating meanss and with
The receiver of the reception antenna connection.The frequency range coverage of the system is 1GHz～18GHz or wider, be can be extended to
80MHz～40GHz or wider, field intensity amplitude coverage is 5V/m～1000V/m or bigger.
The reverberation chamber is preferably the metallic cavity of high q-factor, and its length and width and height are preferably usually no more than 2m.
The agitator and transmitting antenna are located in the reverberation room.The number of steps that the agitator rotates a circle preferably one
As be not less than 250 times.
The electromagnetic field signal generating meanss are located at outside the reverberation room and are connected with the transmitting antenna.The electromagnetic field letter
Number generating meanss may include signal generator, power amplifier and the power monitoring subsystem being sequentially connected, the power monitoring
Subsystem is connected with the transmitting antenna.The power monitoring subsystem may include directional coupler, attenuator, energy meter or work(
Rate sensor, the directional coupler is connected respectively with the power amplifier and the transmitting antenna.The power amplifier
Output in below 200W, the field intensity produced in the reverberation chamber can reach 1000V/m.
In the present embodiment, the size of reverberation chamber be 1.5m × 1m × 0.8m, due to the magnetic distribution in reverberation room compared with
For complexity, so needing to be analyzed using the method for statistics, and need that field intensity is traced to the source to the pattern field persistent erection of the penis of microwave dark room.
Analysis result is as shown in table 1
The input power needed for different field intensity amplitudes is produced under the different frequency of table 1 in reverberation room
For reverberation chamber, the average field-strength within a mixing cycle has certain statistical property, this statistical property
For single mixing position and do not apply to, do not have in all senses yet.Therefore need reverberation chamber agitator in practical operation
Rotated a circle with certain stepping angle, each angle record transmission is popped one's head in and each axial field intensity of emf sensor to be calibrated
As a result.Agitator calculates the flat of transmission probe and emf sensor to be calibrated each axial field intensity result after rotating a circle
Average, in the present embodiment, the stepping number of times that agitator rotates a circle is 250 steps, chooses the stepping that 250 steppings are actual measurement
Number, by the field intensity in the reverberation room that different step numbers are measured as shown in table 2, when step number takes more than 250 steps, field intensity tends to steady
It is fixed.
Field intensity result of calculation under the different stirring steppings of table 2
As shown in figure 3, another aspect of the present invention discloses a kind of a kind of electromagnetism based on reverberation chamber using the system
Field sensor calibration steps, produces first the electromagnetic field of standard field intensity by electromagnetic field signal generating meanss in reverberation room, will
Reception antenna is put in reverberation room with the emf sensor calibrated through microwave dark room, is then adjusted in the reverberation room
Field intensity value of the field intensity of electromagnetic field with emf sensor when microwave dark room is calibrated is identical, calculates the reference of the reception antenna
Antenna factor；The reference antenna coefficient is
AF=P1-E1+IL+107
Wherein, P1For the mean power of reception antenna, E1For field intensity value of the emf sensor when microwave dark room is calibrated,
IL is cable waste.Table 1 is the reference antenna coefficient of calculated reception antenna under 1GHz frequencies, and essentially one constant
Value.
The reverberation chamber equivalent aerial coefficient of table 1 is calculated
Because antenna and reverberation chamber are all passive devices, in theory in its operating frequency range electrical property itself with field intensity
The change of amplitude is basically unchanged.By actual measurement, show being continuously increased with reverberation chamber input signal, its average net input
Power and mean receiving power are substantially linear increase, and average net input power is relative with the holding of the difference of mean receiving power
It is fixed, it was demonstrated that field intensity can be with linear extrapolation to high-amplitude field intensity, as shown in table 2 in reverberation chamber.
The average net input power of reverberation chamber and mean receiving power under the different field intensity amplitudes of table 2
Therefore, with the increase of signal source input signal, the reference antenna coefficient of reverberation chamber reception antenna is definite value, finally
Emf sensor to be calibrated is replaced into the emf sensor, by field intensity in adjustment reverberation chamber to described to be calibrated
Emf sensor is calibrated.Wherein, first the field intensity after adjustment is calculated according to the reference antenna coefficient of the reception antenna,
Field intensity after the adjustment is
E2=P2+AF+IL+107
Wherein, E2For the field intensity of emf sensor position to be calibrated, P2For the mean power of reception antenna；AF is to connect
The reference antenna coefficient of antenna is received, IL is cable waste.
Then the field intensity after adjustment is calculated field intensity amendment with the instruction field intensity value of emf sensor to be calibrated
Factor pair emf sensor to be calibrated is corrected, and the field intensity modifying factor is
Wherein, E2For the field intensity of emf sensor position to be calibrated, E3For the average of emf sensor to be calibrated
Field intensity indicated value.
The result of calculation of the present embodiment is as shown in table 3.
The strong result of calculation in the reverberation chamber equivalent aerial execution ground of table 3
As seen from Table 3, equivalent aerial Y-factor method Y is 0.87dB to the maximum to field intensity measurement result deviation in reverberation chamber, meets
Uncertainty is required.Emf sensor to be calibrated is put in reverberation chamber, by the field intensity for comparing equivalent aerial Y-factor method Y
The reading of result of calculation and emf sensor to be calibrated can complete the calibration of emf sensor.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms, all of embodiment cannot be exhaustive here, it is every to belong to this
Obvious change that bright technical scheme is extended out changes row still in protection scope of the present invention.
Claims (9)
1. a kind of emf sensor calibration system based on reverberation chamber, it is characterised in that the system includes：
Reverberation chamber；
It is placed in the reception antenna that working region in the reverberation room is connected with decay machine；
The receiver being connected with the reception antenna；
Agitator and transmitting antenna in the reverberation room；With
The electromagnetic field signal generating meanss being connected with the transmitting antenna outside the reverberation room.
2. system according to claim 1, it is characterised in that the electromagnetic field signal generating meanss include what is be sequentially connected
Signal generator, power amplifier and power monitoring subsystem, the power monitoring subsystem is connected with the transmitting antenna.
3. system according to claim 2, it is characterised in that the power monitoring subsystem includes directional coupler, declines
Subtract device, energy meter or power sensitive device, the directional coupler is connected respectively with the power amplifier and the transmitting antenna.
4. system according to claim 1, it is characterised in that the output of the power amplifier is in below 200W.
5. system according to claim 1, it is characterised in that the frequency range coverage of the system is 1GHz～18GHz,
Field intensity amplitude coverage is 5V/m～1000V/m.
6. system according to claim 1, it is characterised in that the length and width of the reverberation chamber and high be less than 2m.
7. a kind of emf sensor calibration steps based on reverberation chamber, it is characterised in that methods described includes：
S1：The electromagnetic field of standard field intensity is produced in reverberation room by electromagnetic field signal generating meanss, by reception antenna and
Cross the emf sensor that microwave dark room calibrated to be put in reverberation room；
S2：Adjust field intensity value phase of the field intensity of electromagnetic field with emf sensor when microwave dark room is calibrated in the reverberation room
Together, the reference antenna coefficient of the reception antenna is calculated；
S3：Emf sensor to be calibrated is replaced into the emf sensor, by field intensity in adjustment reverberation chamber to described
Emf sensor to be calibrated is calibrated.
8. method according to claim 7, it is characterised in that the reference antenna coefficient is
AF=P1-E1+IL+107
Wherein, P1For the mean power of reception antenna in reverberation room, E1For field intensity of the emf sensor when microwave dark room is calibrated
Value, IL is cable waste.
9. method according to claim 7, it is characterised in that the S3 includes：
S31：Field intensity after adjustment is calculated according to the reference antenna coefficient of the reception antenna；Field intensity after the adjustment is
E2=P2+AF+IL+107
Wherein, E2For the field intensity of emf sensor position to be calibrated, P2For the mean power of reception antenna；AF is reception day
The reference antenna coefficient of line, IL is cable waste；
S32：Field intensity after adjustment is calculated field intensity modifying factor with the instruction field intensity value of emf sensor to be calibrated
Emf sensor to be calibrated is corrected, the field intensity modifying factor is
Wherein, E2For the field intensity of emf sensor position to be calibrated, E3For the average field-strength of emf sensor to be calibrated
Indicated value.
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Cited By (7)
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| CN107884655A (en) * | 2017-12-14 | 2018-04-06 | 贵州航天计量测试技术研究所 | A kind of microwave camera bellows space attenuation calibrating installation and calibration method |
| CN108152772A (en) * | 2017-12-26 | 2018-06-12 | 北京无线电计量测试研究所 | A kind of high-amplitude field strength sensor calibration method based on microwave dark room |
| CN108414840A (en) * | 2018-02-01 | 2018-08-17 | 中国舰船研究设计中心 | A kind of electromagnetic reverberation room insert loss method |
| CN112415280A (en) * | 2020-11-26 | 2021-02-26 | 上海卫星装备研究所 | Spacecraft radiation emission test system and method based on electric wave reverberation chamber |
| CN112558001A (en) * | 2020-12-18 | 2021-03-26 | 北京无线电计量测试研究所 | Pulse high-power field calibration device and method |
| CN113904740A (en) * | 2021-09-30 | 2022-01-07 | 国家无线电监测中心检测中心 | Calibration system and method for testing 5G base station based on reverberation room |
| CN114019275A (en) * | 2021-10-28 | 2022-02-08 | 中国舰船研究设计中心 | Software-driven electromagnetic environment closed loop generation system and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107884655A (en) * | 2017-12-14 | 2018-04-06 | 贵州航天计量测试技术研究所 | A kind of microwave camera bellows space attenuation calibrating installation and calibration method |
| CN108152772A (en) * | 2017-12-26 | 2018-06-12 | 北京无线电计量测试研究所 | A kind of high-amplitude field strength sensor calibration method based on microwave dark room |
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| CN108414840A (en) * | 2018-02-01 | 2018-08-17 | 中国舰船研究设计中心 | A kind of electromagnetic reverberation room insert loss method |
| CN108414840B (en) * | 2018-02-01 | 2020-04-21 | 中国舰船研究设计中心 | Method for measuring insertion loss of electromagnetic reverberation chamber |
| CN112415280A (en) * | 2020-11-26 | 2021-02-26 | 上海卫星装备研究所 | Spacecraft radiation emission test system and method based on electric wave reverberation chamber |
| CN112558001A (en) * | 2020-12-18 | 2021-03-26 | 北京无线电计量测试研究所 | Pulse high-power field calibration device and method |
| CN112558001B (en) * | 2020-12-18 | 2023-03-21 | 北京无线电计量测试研究所 | Pulse high-power field calibration device and method |
| CN113904740A (en) * | 2021-09-30 | 2022-01-07 | 国家无线电监测中心检测中心 | Calibration system and method for testing 5G base station based on reverberation room |
| CN113904740B (en) * | 2021-09-30 | 2024-05-17 | 国家无线电监测中心检测中心 | System and method for calibrating 5G base station test based on reverberation room |
| CN114019275A (en) * | 2021-10-28 | 2022-02-08 | 中国舰船研究设计中心 | Software-driven electromagnetic environment closed loop generation system and method |
| CN114019275B (en) * | 2021-10-28 | 2024-10-01 | 中国舰船研究设计中心 | Software-driven electromagnetic environment closed-loop generation system and method |
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