CN104793163A - Method for automatically calibrating the field intensity distribution characteristics of electromagnetic reverberation chamber - Google Patents
Method for automatically calibrating the field intensity distribution characteristics of electromagnetic reverberation chamber Download PDFInfo
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Abstract
The invention discloses a method for calibrating the field intensity distribution characteristics of an electromagnetic reverberation chamber. The field intensity of an electromagnetic reverberation chamber can be tested by eight field intensity probes at the same time to acquire the field intensity distribution characteristics. The precision is high, and the speed is high. Spatial field intensity sensors are used to sense spatial 100MHz-18GHz radio-frequency microwave electromagnetic field signals and convert the radio-frequency microwave signals into direct-current signals. The eight channels of signals are transmitted by optical fibers to a data receiving unit after data processing end encoding is carried out and the direct-current signals pass through an electro-optical converter. The field intensity distribution characteristics of the electromagnetic reverberation chamber are calculated and processed through a central processing unit. The method is disclosed to realize accurate measurement of the distribution characteristics of a spatial broadband electromagnetic field. The range of field intensity amplitude measurement is from 1V/m to 200V/m, and the inaccuracy of measurement is 1.5dB.
Description
Technical field
The present invention relates to Radio Measurements technical field, be specifically related to a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method.
Background technology
The single parameter test method research of parameter is mainly paid close attention in the domestic research to reverberation chamber space radio frequency electromagnetic field at present, the method of testing of single or several parameter and automatically controlling, but single-spot testing result effectively can not embody the real-time distribution characteristic of reverberation chamber field intensity, calibration verification electromagnetic reverberation room performance being carried out to composite measurement and evaluation can not be realized, and also not yet find correlative study field intensity probe calibrating position and Multi probe multi-measuring point being carried out simultaneously to work at present, therefore the present invention needs to carry out the method that Multi probe multi-measuring point carries out testing simultaneously, and the optimum configurations such as field intensity probe calibrating position are studied.
Summary of the invention
In view of this, the invention provides a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method, 8 field intensity probe can be utilized simultaneously to test the field intensity of electromagnetic reverberation room, obtain field strength distribution characteristic, precision is high, and speed is fast.
Electromagnetic reverberation room field strength distribution characteristic calibrating method of the present invention, comprises the steps:
Step 1, calibrating apparatus for fixing:
Described calibrating installation is made up of sensor stand, field strength sensor and CPU (central processing unit); Wherein, sensor stand comprises 2 orienting lugs, support bar and jacking gears; Orienting lug is arranged on support bar, and can move up and down along support bar, there is certain distance between 2 orienting lugs; Each orienting lug circumference is evenly arranged 8 extension rods, and extension rod 4 length 4 is short, and long and short extension rod is interspersed, and each extension rod fixedly mounts a field strength sensor, and jacking gear is arranged on bottom support bar; Each field strength sensor is connected with CPU (central processing unit) respectively by optical fiber;
Step 2, is placed on reverberation chamber center by sensor stand, the field strength sensor according to reverberation chamber size adjustment orienting lug height and on the extension rod selecting 8 length consistent, makes 8 field strength sensors be uniformly distributed along sensor stand circumference;
Step 3, setting signal frequency generator and reverberation chamber stirrer stir angle, launched microwave signal in reverberation chamber, selected field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal through Optical Fiber Transmission to CPU (central processing unit), the direct current signal that CPU (central processing unit) received field strength sensor sends, piecewise linear relationship curve according to the direct current signal obtained in advance and 3 D electromagnetic field field intensity obtains electromagnetic field field intensity data, namely the X of 8 sensor positions is obtained, Y, the field intensity of Z three-dimensional electromagnetic field, and X, Y, the field intensity maximal value of the electromagnetic field of Z three-dimensional,
Step 4, changes reverberation chamber stirrer and stirs angle, repeat step 3, the electromagnetic field field intensity data under acquisition ongoing frequency under all stirring angles;
Step 5, changes Frequency Of Signal Generator, repeats step 3 ~ step 4, and electromagnetic field field intensity data under acquisition full rate, then utilize Bessel Formula statistical study field intensity data, obtain field uniformity result, calibrate the field strength distribution of reverberation chamber.
Beneficial effect:
The present invention is in conjunction with existing electromagnetic measurement instrument, have developed eight probe optical fiber field intensity automated watch-keeping facilities, propose and achieve electromagnetic reverberation room spatial field distribution character automatic calibrating method, specific implementation process is: devise special locating support and automatic lifting controller, performance parameter automatic calibration control software design etc., by the motion of software control support, automatically gather field intensity parameter simultaneously, calculated by computer-internal and achieve electromagnetic reverberation room workspace spatial field homogeneity, insertion loss, load factor and load factor, the isoparametric automatic calibration of chamber loading coefficient, realize electromagnetic reverberation room frequency microwave magnetic distribution to measure in real time, wide frequency range, dynamic range, fill up the blank that electromagnetic reverberation room performance has no idea to measure at present, for establishment " electromagnetic reverberation room performance calibration specification " and analyzing and evaluating uncertainty provide hardware supported, create test condition, calibration data is provided, signal transmission through fiber strong interference immunity, easy to use, be suitable for research and production, remote magnetic distribution is measured, be particularly suitable for industry, environmental protection, communication, the frequency microwave electromagnetic field tests such as weaponry, calibration.
Accompanying drawing explanation
Fig. 1 is hardware configuration schematic diagram in electromagnetic reverberation room field strength distribution characteristic calibrating method.
Fig. 2 is automatic calibration rack assumption diagram.
Fig. 3 is orienting lug extension rod structural representation.
Fig. 4 is field strength sensor calibration scheme of installation.
Wherein, 1-support bar, 2-orienting lug, 3-field strength sensor, 4-jacking gear, 5-extension rod.
Embodiment
To develop simultaneously embodiment below in conjunction with accompanying drawing, describe the present invention.
The invention provides a kind of electromagnetic reverberation room field strength distribution characteristic calibrating method, first test macro is as shown in Figure 1 set up, described test macro comprises 8 identical field strength sensors, sensor stand and CPU (central processing unit), wherein, sensor stand is arranged in field intensity, field strength sensor is arranged on sensor stand, field strength sensor is connected with CPU (central processing unit) by optical fiber, eight field strength sensor inductive spacing X simultaneously, Y, Z three-dimensional electromagnetic field signal, and this 8 road signal is passed to CPU (central processing unit) through optical fiber simultaneously carry out data processing, obtain electromagnetic reverberation room field strength distribution characteristic.
Described sensor stand as shown in Figure 2, comprise 2 orienting lugs (being called the first orienting lug and the second orienting lug), support bar and jacking gear, wherein, orienting lug is arranged on support bar, and up and down in the guide groove can preset at support bar, and each orienting lug circumference is evenly outward extended with the extension rod in 8 directions, 8 extension rods are that 4 length 4 are short, long and short extension rod is interspersed, and field strength sensor is arranged on extension rod, as shown in Figure 3.Certain distance is there is between 2 orienting lugs, jacking gear is arranged on bottom support bar, slided up and down along support bar axle center by stay cord Sports band action-oriented block, the installation site of field strength sensor can be changed by such design, ensure the real-time change of probe calibration position and accurately locate.During calibration, field strength sensor on the extension rod selecting 8 length consistent receives reverberation chamber field intensity signal, as shown in Figure 4, in Fig. 4, " O " represents the field strength sensor be arranged on the first orienting lug, and " X " represents the field strength sensor be arranged on the second orienting lug.Wherein, support bar can be divided into four sections, each section is a hollow cylinder Φ 100mm, and the concentric pipeline section of the preceding paragraph is connected with the concentric pipeline section of next section by screw rod, can ensure the rectilinearity of upper and lower two-stage structure body, and completes the bridge joint of structural member and fix.Support bar focuses on the relation of structural strength and weight, ensures that orienting lug is along hollow cylinder even running simultaneously.Consider that electromagnetic reverberation room standing internal wave field is easily subject to the material interference such as metal, affect transmission direction, need the intensity ensureing structure in addition simultaneously, therefore orienting lug of the present invention and jacking gear adopt nonmetallic materials, so both can alleviate the weight of orienting lug and jacking gear, and the intensity of structure can have been ensured again and the interference of support to field can be reduced.The bottom of support bar adopts welded steel to become a square platform, from overhanging four supporters of platform, supporter is provided with direction movement wheel, is convenient to the integrally-built running fix before calibrating on the one hand, adapts to the request for utilization of different places; Four supporters are connected with Platform hinge on the other hand, and supporter can be received and can put, and make one-piece construction be convenient to transport and carry.In square platform structure framework, inside is provided with small machine, driving device, control circuit etc., by ascending, descending and the positioning function of operator's control cincture action-oriented block, thus realize movement and the location of 8 detecting sensors, method needs can be met without other motions, complete reverberation chamber calibration operation.
Electromagnetic field stability, uniformity during in order to ensure to sample, the present invention adopts eight field strength sensors inductive spacing X, Y, Z three-dimensional electromagnetic field signal simultaneously, wherein, field strength sensor inside comprises dipole sensor, signal condition part, part of data acquisition, sensor CPU part, opto-electronic conversion and electro-optic conversion part and battery compartment.Wherein, under the control of sensor CPU part, dipole sensor is used for inductive pick-up field intensity signal, the field intensity signal of dipole sensor collection is nursed one's health into the signal of applicable AD converter process size by signal condition part, data after process are sent to AD converter, 24 A/D converter AD7739 are adopted in single field strength sensor, A/D converter band three-pass DINSAR inputs, ± 5V powers, signal after AD converter conversion stores in a register after opto-electronic conversion and electro-optic conversion part convert electric signal to, simultaneously through light transmission to CPU (central processing unit).
For guaranteeing space field intensity data channel consistance, the Signal transmissions between field strength sensor and data processing unit adopts optical fiber parallel mode, and realize Phototube Coupling, antijamming capability is strong.During optical fiber communication, signal attenuation, much smaller than signal attenuation when plain conductor and coaxial cable transmission, can realize extra long distance Signal transmissions.The present invention adopts 16 road optical fiber altogether, and wherein the control signal that data processing units send to field strength sensor is transmitted on 8 tunnels, for controlling the switch of sensor image data; 8 tunnel Optical Fiber Transmission field strength sensors send to the digital signal of data processing unit, and this group digital signal, containing X, Y, Z field intensity coded message, can ensure field intensity data consistency, and measuring speed is improved.
Because sensor relies on dipole induction field signal, direct current signal is become after induction detection, the relation of direct current signal and electric field exists non-linear, spatial field shows as integrated value simultaneously, there is larger difficulty in the decomposition solution in theory of X, Y, Z three-dimensional component, there is contact when obtaining fitting algorithm between X, Y, Z three-dimensional and comprehensive field, simple linear relationship can not relation between accurate characterization X, Y, Z three-dimensional field intensity and corresponding direct current signal.Therefore, the present invention is before Field strength calibration, first employing piecewise fitting method obtains the piecewise linear curve close to desirable detection direct current signal and space three-dimensional electromagnetic field field intensity relation, namely adopt and experimentally obtain sensor linear induced field strength curve corresponding under different frequency range respectively, the final piecewise linear relationship curve obtaining full frequency band direct current signal and 3 D electromagnetic field field intensity.8 data receipt unit in CPU (central processing unit) receive the signal that 8 field strength sensors send respectively, then the field intensity of X, Y, Z three-dimensional electromagnetic field of 8 sensor positions can be obtained according to the prior direct current signal of acquisition and the piecewise linear relationship curve of 3 D electromagnetic field field intensity, and the field intensity maximal value of the electromagnetic field of X, Y, Z three-dimensional.Then utilize Bessel Formula statistical study field intensity data, describe electromagnetic reverberation room workspace X, Y, Z three-dimensional and comprehensive field intensity homogeneity, the field strength distribution of reverberation chamber is calibrated.
Concrete calibration steps is as follows:
Step 1, sensor stand is placed on reverberation chamber center, according to reverberation chamber size adjustment orienting lug height, make it to meet alignment requirements, there is certain difference in height in 4 field strength sensors of the first orienting lug and 4 sensors of the second orienting lug simultaneously, field strength sensor on the extension rod selecting 8 length consistent, 8 field strength sensors are uniformly distributed along sensor stand circumference.
Step 2, start signal generator is Turn-on voltage sensor simultaneously, from CPU (central processing unit) observation signal reception condition, observes working sensor whether normal and analyze appropriate signals size (voltage between+-5V, can correctly show and amplitude is suitable).
Step 3, setting signal frequency generator and reverberation chamber stirrer stir angle, launched microwave signal in reverberation chamber, field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal through Optical Fiber Transmission to CPU (central processing unit), the direct current signal that CPU (central processing unit) received field strength sensor sends, and obtain the field intensity of X, Y, Z three-dimensional electromagnetic field of 8 sensor positions according to the prior direct current signal of acquisition and the piecewise linear relationship curve of 3 D electromagnetic field field intensity, and the field intensity maximal value of the electromagnetic field of X, Y, Z three-dimensional.
Step 4, changes reverberation chamber stirrer and stirs angle (0 ° ~ 355 ° stepped intervals 5 °), repeat step 3, obtains the electromagnetic field field intensity data under all stirring angles under ongoing frequency;
Step 5, changes Frequency Of Signal Generator (200MHz ~ 18GHz), repeats step 3 ~ step 4, electromagnetic field field intensity data under acquisition full rate, then utilize Bessel Formula statistical study field intensity data, obtain field uniformity result, the field strength distribution of reverberation chamber is calibrated.
The present invention utilizes field intensity sensor sensing space, space 100MHz ~ 18GHz frequency microwave electromagnetic field signal, and convert frequency microwave signal to direct current signal, through data processing and coding by eight road signals being transferred to data receipt unit by optical fiber after electrical to optical converter simultaneously, and carry out the process of electromagnetic reverberation room field strength distribution property calculation in CPU (central processing unit).In order to solve the Measurement accuracy of space broadband distribution of electromagnetic field, field intensity amplitude measurement scope is 1V/m ~ 200V/m, measures inaccuracy 1.5dB.
In sum, these are only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. an electromagnetic reverberation room field strength distribution characteristic calibrating method, is characterized in that, comprises the steps:
Step 1, calibrating apparatus for fixing:
Described calibrating installation is made up of sensor stand, field strength sensor and CPU (central processing unit); Wherein, sensor stand comprises 2 orienting lugs, support bar and jacking gears; Orienting lug is arranged on support bar, and can move up and down along support bar, there is certain distance between 2 orienting lugs; Each orienting lug circumference is evenly arranged 8 extension rods, and extension rod 4 length 4 is short, and long and short extension rod is interspersed, and each extension rod fixedly mounts a field strength sensor, and jacking gear is arranged on bottom support bar; Each field strength sensor is connected with CPU (central processing unit) respectively by optical fiber;
Step 2, is placed on reverberation chamber center by sensor stand, the field strength sensor according to reverberation chamber size adjustment orienting lug height and on the extension rod selecting 8 length consistent, makes 8 field strength sensors be uniformly distributed along sensor stand circumference;
Step 3, setting signal frequency generator and reverberation chamber stirrer stir angle, launched microwave signal in reverberation chamber, selected field strength sensor receives the field intensity signal under current demand signal and is converted to direct current signal through Optical Fiber Transmission to CPU (central processing unit), the direct current signal that CPU (central processing unit) received field strength sensor sends, piecewise linear relationship curve according to the direct current signal obtained in advance and 3 D electromagnetic field field intensity obtains electromagnetic field field intensity data, namely the X of 8 sensor positions is obtained, Y, the field intensity of Z three-dimensional electromagnetic field, and X, Y, the field intensity maximal value of the electromagnetic field of Z three-dimensional,
Step 4, changes reverberation chamber stirrer and stirs angle, repeat step 3, the electromagnetic field field intensity data under acquisition ongoing frequency under all stirring angles;
Step 5, changes Frequency Of Signal Generator, repeats step 3 ~ step 4, and electromagnetic field field intensity data under acquisition full rate, then utilize Bessel Formula statistical study field intensity data, obtain field uniformity result, calibrate the field strength distribution of reverberation chamber.
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| CN106772177A (en) * | 2016-12-09 | 2017-05-31 | 北京无线电计量测试研究所 | A kind of emf sensor calibration system based on reverberation chamber and transmission probe |
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| 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 |
| CN110998340A (en) * | 2017-07-13 | 2020-04-10 | 应用材料公司 | Method and device for detecting a microwave field in a cavity |
| 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 |
| 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 |
| CN112798875A (en) * | 2020-12-30 | 2021-05-14 | 清远市天之衡传感科技有限公司 | Millimeter wave and terahertz wave electric field measuring method, device and system |
| 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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