CN104793163B - A kind of electromagnetic reverberation room field strength distribution characteristic automatic calibrating method - Google Patents
A kind of electromagnetic reverberation room field strength distribution characteristic automatic calibrating method Download PDFInfo
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Abstract
The invention discloses a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method.The field strength of electromagnetic reverberation room can be tested simultaneously using 8 field intensity probes using the present invention, obtain field strength distribution characteristic, precision is high, and speed is fast.Utilization space field strength sensor inductive spacing 100MHz~18GHz frequency microwave electromagnetic field signals, and frequency microwave signal is converted into direct current signal, eight road signal simultaneous transmissions are subjected to the processing of electromagnetic reverberation room field strength distribution property calculation to data receipt unit, and in CPU by optical fiber after data processing and coding pass through electrical to optical converter.To solve the accurate measurement of space broadband distribution of electromagnetic field, field strength amplitude measurement scope is 1V/m~200V/m, measurement inaccuracy 1.5dB.
Description
Technical field
The present invention relates to Radio Measurements technical field, and in particular to a kind of electromagnetic reverberation room field strength distribution characteristic calibration side
Method.
Background technology
The research to reverberation chamber space radio frequency electromagnetic field domestic at present be primarily upon the single parameter test method research of parameter,
The method of testing of single or several parameters and automatically control, but single-spot testing result can not effectively embody the reality of reverberation chamber field strength
When distribution character, it is impossible to realize and composite measurement and the calibration verification of evaluation carried out to electromagnetic reverberation room performance, and at present also not yet
Find to field intensity probe calibrating position and Multi probe multi-measuring point while the correlative study that is operated, therefore the present invention needs to carry out
The method that Multi probe multi-measuring point is tested simultaneously, and the parameter settings such as field intensity probe calibrating position are studied.
The content of the invention
In view of this, the invention provides a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method, 8 fields can be utilized
Strong probe is tested the field strength of electromagnetic reverberation room simultaneously, obtains field strength distribution characteristic, and precision is high, and speed is fast.
The electromagnetic reverberation room field strength distribution characteristic calibrating method of the present invention, comprises the following steps：
Step 1, calibrating apparatus for fixing：
The calibrating installation is made up of sensor stand, field strength sensor and CPU；Wherein, sensor stand
Including 2 guide pads, support bar and lowering or hoisting gear；Guide pad is arranged on support bar, and can be moved up and down along support bar, 2
A certain distance between guide pad be present；Each guide pad is arranged circumferentially 8 extension rods, and the length 4 of extension rod 4 is short, long and short to prolong
Boom is interspersed, and a field strength sensor is fixedly mounted on each extension rod, and lowering or hoisting gear is arranged on support bar bottom；Each field
Strong sensor is connected by optical fiber with CPU respectively；
Step 2, sensor stand is placed on reverberation chamber center, according to the big minor adjustment guide pad height of reverberation chamber simultaneously
The field strength sensor on the consistent extension rod of 8 length is selected, makes 8 field strength sensors uniformly divide along sensor stand is circumferential
Cloth；
Step 3, setting signal frequency generator and reverberation chamber agitator stirring angle, microwave letter is launched into reverberation chamber
Number, selected field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal is transferred to centre through optical fiber
Manage unit, the direct current signal that CPU received field strength sensor is sent, according to the direct current signal obtained in advance and three-dimensional
The piecewise linear relationship curve of electromagnetic field field strength obtains electromagnetic field field strength data, that is, obtains X, Y, Z of 8 sensor positions
The field strength of three-dimensional electromagnetic field, and the field strength maximum of the electromagnetic field of X, Y, Z three-dimensional；
Step 4, change reverberation chamber agitator stirring angle, repeat step 3, obtain under current frequency under all stirring angles
Electromagnetic field field strength data；
Step 5, change Frequency Of Signal Generator, 3~step 4 of repeat step, obtain electromagnetic field field strength data under full rate,
Then Bessel Formula statistical analysis field strength data are utilized, field uniformity result is obtained, school is carried out to the field strength distribution of reverberation chamber
It is accurate.
Beneficial effect：
The present invention combines existing electromagnetic measurement instrument, have developed eight probe optical fiber field strength automated watch-keeping facilities, proposes simultaneously
Electromagnetic reverberation room space Field distribution characteristic automatic calibrating method is realized, specific implementation process is：Devise special locating support
And automatic lifting controller, performance parameter calibrate control software etc. automatically, the motion of support is controlled by software, while is adopted automatically
Collect field strength parameter, being calculated by computer-internal realizes electromagnetic reverberation room workspace space field uniformity, insertion loss, load
The automatic calibration of the parameter such as the factor and load factor, chamber loading coefficient, realizes electromagnetic reverberation room frequency microwave magnetic distribution
Measurement in real time, wide frequency range, dynamic range, has filled up the blank that electromagnetic reverberation room performance is measured currently without method, to compile
System《Electromagnetic reverberation room performance calibration specification》Hardware supported is provided with analyzing and evaluating uncertainty, creates experimental condition, is carried
For calibration data, signal transmission through fiber strong interference immunity is easy to use, is suitable for research and production, remote magnetic distribution is surveyed
Amount, it is particularly suitable for the experiment of the frequency microwave electromagnetic fields such as industry, environmental protection, communication, weaponry, calibration.
Brief description of the drawings
Fig. 1 is hardware configuration schematic diagram in electromagnetic reverberation room field strength distribution characteristic calibrating method.
Fig. 2 is automatic sizing stop structure chart.
Fig. 3 is guide pad extension rod structural representation.
Fig. 4 is that field strength sensor calibrates scheme of installation.
Wherein, 1- support bars, 2- guide pads, 3- field strength sensors, 4- lowering or hoisting gears, 5- extension rods.
Embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The invention provides a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method, survey as shown in Figure 1 is initially set up
Test system, the test system include 8 identical field strength sensors, sensor stand and CPU, wherein, pass
Sensor bracket is arranged in field strength, and field strength sensor is arranged on sensor stand, and field strength sensor passes through optical fiber and centre
Manage unit connection, eight field strength sensor inductive spacing X, Y, Z three-dimensional electromagnetic field signals, and by this 8 road signal through optical fiber simultaneously
CPU is passed to simultaneously and carries out data processing, obtains electromagnetic reverberation room field strength distribution characteristic.
The sensor stand including 2 guide pads as shown in Fig. 2 (be referred to as the first guide pad and second to be oriented to
Block), support bar and lowering or hoisting gear, wherein, guide pad is arranged on support bar, and can be living up and down in the default guide groove of support bar
Dynamic, each guide pad is circumferentially uniformly outward extended with the extension rod in 8 directions, and 8 extension rods are 44 short, long and short extension rods of length
It is interspersed, field strength sensor is arranged on extension rod, as shown in Figure 3.A certain distance be present between 2 guide pads, lift
Device is arranged on support bar bottom, is moved by drawstring and drives guide pad to be slided up and down along support bar axle center, set by such
Meter can change the installation site of field strength sensor, ensure the real-time change of probe calibration position and be accurately positioned.During calibration, choosing
The field strength sensor selected on 8 consistent extension rods of length receives reverberation chamber field intensity signal, as shown in figure 4, in Fig. 4, " O " is represented
Field strength sensor on the first guide pad, " X " represent the field strength sensor being arranged on the second guide pad.Wherein, may be used
So that support bar is divided into four sections, each section is a hollow cylinder Φ 100mm, the concentric pipeline section of the preceding paragraph by screw rod with it is next
Duan Tongxin pipeline sections connect, it is ensured that the linearity of upper and lower two-stage structure body, and complete bridge joint and the fixation of structural member.Support
Bar focuses on the relation of structural strength and weight, while ensures guide pad along hollow cylinder even running.In view of electromagnetism reverberation
Indoor stationary field is easily disturbed by materials such as metals, influences transmission direction, while the intensity also in need for ensureing structure, therefore originally
Invention guide pad and lowering or hoisting gear use nonmetallic materials, so can both mitigate the weight of guide pad and lowering or hoisting gear, and can
Ensure the intensity of structure and interference of the support to field can be reduced.The bottom of support bar using welded steel into a square platform, from
Overhanging four supporters of platform, direction movement wheel is installed on supporter, the integrally-built movement being on the one hand easy to before calibration
Positioning, adapts to different place requirements；On the other hand four supporters are connected with Platform hinge, and supporter, which can be received, to be put, and make
Overall structure is readily transported and carried.In square platform structure framework, inside is provided with small machine, driving machinery, control electricity
Road etc., ascending, descending and the positioning function for driving guide pad are controlled by operator, so as to realize the movement of 8 detection sensors and fixed
Position, it can meet method needs without other motions, complete reverberation chamber calibration.
Electromagnetic field stability, uniformity during in order to ensure sampling, the present invention sense sky simultaneously using eight field strength sensors
Between X, Y, Z three-dimensional electromagnetic field signal, wherein, adopted comprising dipole sensor, signal condition part, data inside field strength sensor
Collect part, sensor CPU part, opto-electronic conversion and electro-optic conversion part and battery compartment.Wherein, in sensor CPU part
Under control, dipole sensor is used for inductive pick-up field intensity signal, the field strength that signal condition part gathers dipole sensor
Data after processing are sent to a/d converter, single field strength passes by signal condition into the signal of suitable a/d converter processing size
24 A/D converter AD7739 are used in sensor, A/D converter band three-pass DINSAR inputs, ± 5V power supplies, after a/d converter conversion
Signal store in a register after opto-electronic conversion and electro-optic conversion part are converted into electric signal, while be transferred to through light
Central Processing Unit.
To ensure space field strength data channel uniformity, the signal transmission between field strength sensor and data processing unit is adopted
With optical fiber parallel mode, Phototube Coupling, strong antijamming capability are realized.During fiber optic communication, signal attenuation much smaller than plain conductor and
Signal attenuation when coaxial line transmits, the transmission of extra long distance signal can be achieved.The present invention uses 16 road optical fiber altogether, wherein 8 tunnels pass
The control signal that transmission of data processing unit is sent to field strength sensor, for controlling the switch of sensor gathered data；8 road optical fiber
Transmission field strength sensor is sent to the data signal of data processing unit, this group of data signal field strength coding information containing X, Y, Z, energy
Enough ensure field strength data consistency, and improve measuring speed.
Because sensor is to rely on dipole induction field signal, be changed into direct current signal after sensing detection, direct current signal with
The relation of electric field exists non-linear, while spatial field shows as integrated value, the solution of the decomposition of X, Y, Z three-dimensional component in theory
Larger difficulty be present, contact be present between X, Y, Z three-dimensional and comprehensive field when obtaining fitting algorithm, simple linear relationship can not
Relation between accurate characterization X, Y, Z three-dimensional field strength and corresponding direct current signal.Therefore, the present invention is before Field strength calibration, first
The piecewise linearity close to preferable detection direct current signal and space three-dimensional electromagnetic field field strength relation is obtained using piecewise fitting method
Curve, that is, adopt and experimentally obtain sensor corresponding linear induced field strength curve under different frequency range respectively, finally
Obtain full frequency band direct current signal and the piecewise linear relationship curve of 3 D electromagnetic field field strength.8 data in CPU
Receiving unit receives the signal that 8 field strength sensors are sent respectively, then can be according to the direct current signal obtained in advance and three-dimensional
The piecewise linear relationship curve of electromagnetic field field strength obtains the field strength of X, Y, Z three-dimensional electromagnetic field of 8 sensor positions, and
X, the field strength maximum of the electromagnetic field of Y, Z three-dimensional.Then Bessel Formula statistical analysis field strength data are utilized, describe electromagnetism reverberation
Room workspace X, Y, Z three-dimensional and comprehensive field strength uniformity, are calibrated to the field strength distribution of reverberation chamber.
Specific calibration method is as follows：
Step 1, sensor stand is placed on reverberation chamber center, according to the big minor adjustment guide pad of reverberation chamber highly,
It is allowed to meet alignment requirements, while 4 sensors of 4 field strength sensors of the first guide pad and the second guide pad are present necessarily
Difference in height, select the field strength sensor on the consistent extension rod of 8 length, 8 field strength sensors are circumferential along sensor stand
It is uniformly distributed.
Step 2, open signal generator while Turn-on voltage sensor, feelings are received from CPU observation signal
Condition, whether observation working sensor normal and analysis appropriate signals size (voltage can correctly show between+- 5V and amplitude is closed
It is suitable).
Step 3, setting signal frequency generator and reverberation chamber agitator stirring angle, microwave letter is launched into reverberation chamber
Number, field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal is transferred to central processing list through optical fiber
Member, the direct current signal that CPU received field strength sensor is sent, and according to the direct current signal obtained in advance and three-dimensional electricity
The field strength of X, Y, Z three-dimensional electromagnetic field of 8 sensor positions of piecewise linear relationship curve acquisition of field strength, and X,
Y, the field strength maximum of the electromagnetic field of Z three-dimensionals.
Step 4, change reverberation chamber agitator stirring angle (0 °~355 ° 5 ° of stepped intervals), repeat step 3, obtain current
Electromagnetic field field strength data under frequency under all stirring angles；
Step 5, change Frequency Of Signal Generator (200MHz~18GHz), 3~step 4 of repeat step, obtain under full rate
Electromagnetic field field strength data, then using Bessel Formula statistical analysis field strength data, field uniformity result is obtained, to reverberation chamber
Field strength distribution is calibrated.
Utilization space field strength sensor inductive spacing 100MHz~18GHz frequency microwave electromagnetic field signals of the present invention, and will
Frequency microwave signal is converted into direct current signal, by optical fiber that eight road signals are same after data processing and coding pass through electrical to optical converter
When be transferred to data receipt unit, and carry out the processing of electromagnetic reverberation room field strength distribution property calculation in CPU.To
Solves the accurate measurement of space broadband distribution of electromagnetic field, field strength amplitude measurement scope is 1V/m~200V/m, and measurement is not
Degree of accuracy 1.5dB.
In summary, presently preferred embodiments of the present invention is these are only, is not intended to limit the scope of the present invention.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., it should be included in the present invention's
Within protection domain.
Claims (1)
1. a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method, it is characterised in that comprise the following steps：
Step 1, calibrating apparatus for fixing：
The calibrating installation is made up of sensor stand, field strength sensor and CPU；Wherein, sensor stand includes
2 guide pads, support bar and lowering or hoisting gear；Guide pad is arranged on support bar, and can be moved up and down along support bar, 2 guiding
A certain distance between block be present；Each guide pad is arranged circumferentially 8 extension rods, and extension rod 4 grows 4 short, long and short extension rods
It is interspersed, a field strength sensor is fixedly mounted on each extension rod, lowering or hoisting gear is arranged on support bar bottom；Each field strength passes
Sensor is connected by optical fiber with CPU respectively；
Step 2, sensor stand is placed on reverberation chamber center, according to the big minor adjustment guide pad height of reverberation chamber and selected
Field strength sensor on the consistent extension rod of 8 length, makes 8 field strength sensors be circumferentially uniformly distributed along sensor stand；
Step 3, setting signal frequency generator and reverberation chamber agitator stirring angle, microwave signal is launched into reverberation chamber, is selected
Fixed field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal is transferred to central processing list through optical fiber
Member, the direct current signal that CPU received field strength sensor is sent, according to the direct current signal and 3 D electromagnetic obtained in advance
The piecewise linear relationship curve of field field strength obtains electromagnetic field field strength data, that is, obtains X, Y, Z three-dimensional of 8 sensor positions
The field strength of electromagnetic field, and the field strength maximum of the electromagnetic field of X, Y, Z three-dimensional；
Step 4, change reverberation chamber agitator stirring angle, repeat step 3, obtain the electricity under all stirring angles under current frequency
Field strength data；
Step 5, change Frequency Of Signal Generator, 3~step 4 of repeat step, obtain electromagnetic field field strength data under full rate, then
Using Bessel Formula statistical analysis field strength data, field uniformity result is obtained, the field strength distribution of reverberation chamber is calibrated.
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| CN106483485B (en) * | 2016-11-03 | 2019-04-30 | 北京无线电计量测试研究所 | A kind of high strength field sensor calibrating method |
| CN106597340B (en) * | 2016-12-09 | 2019-05-10 | 北京无线电计量测试研究所 | A kind of emf sensor calibration system and method based on reverberation chamber |
| CN106772177B (en) * | 2016-12-09 | 2019-05-17 | 北京无线电计量测试研究所 | A kind of emf sensor calibration system based on reverberation chamber and transmitting probe |
| US10677830B2 (en) * | 2017-07-13 | 2020-06-09 | Applied Materials, Inc. | Methods and apparatus for detecting microwave fields in a cavity |
| CN112415280B (en) * | 2020-11-26 | 2022-08-12 | 上海卫星装备研究所 | Spacecraft radiation emission test system and method based on electric wave reverberation chamber |
| CN112798875B (en) * | 2020-12-30 | 2023-08-08 | 清远市天之衡传感科技有限公司 | Millimeter wave and terahertz wave electric field measurement method, device and system |
| CN113138359A (en) * | 2021-04-02 | 2021-07-20 | 中国舰船研究设计中心 | Automatic calibration device and calibration method for field uniformity of TEM (Transmission Electron microscope) chamber |
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| CN200968972Y (en) * | 2006-11-17 | 2007-10-31 | 中国舰船研究设计中心 | Tunable test probe bracket |
| CN201229398Y (en) * | 2008-07-23 | 2009-04-29 | 广州赛宝计量检测中心服务有限公司 | Automatic positioning device for calibrating homogeneity of portable anechoic enclosure |
| CN102608558B (en) * | 2012-03-31 | 2014-06-25 | 上海市计量测试技术研究院 | Radiation field uniformity calibration positioner |
| CN103197156A (en) * | 2013-03-20 | 2013-07-10 | 中国舰船研究设计中心 | Synchronous acquisition system and method for multi-channel electromagnetic field intensity |
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Inventor after: Zhu Chuanhuan Inventor after: Zhang Hengping Inventor after: Tang Jun Inventor after: Yang Hongyan Inventor before: Zhu Xianming Inventor before: Zhu Chuanhuan Inventor before: Zhang Hengping Inventor before: Tang Jun Inventor before: Yang Hongyan |
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