CN201666927U - Spatial and tridimensional electromagnetic interference instrument based on single chip micro-computer - Google Patents
Spatial and tridimensional electromagnetic interference instrument based on single chip micro-computer Download PDFInfo
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- CN201666927U CN201666927U CN2010201519111U CN201020151911U CN201666927U CN 201666927 U CN201666927 U CN 201666927U CN 2010201519111 U CN2010201519111 U CN 2010201519111U CN 201020151911 U CN201020151911 U CN 201020151911U CN 201666927 U CN201666927 U CN 201666927U
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Abstract
The utility model discloses a spatial and tridimensional electromagnetic interference instrument based on single chip micro-computer. The instrument comprises an electromagnetic waves generating circuit, an electromagnetic waves receiving circuit, an electromagnetism collecting box, a control module and a power source. The electromagnetic waves generating circuit includes a signal source, an amplified high-frequency small-signal model, a high frequency signal drive power amplifier and a directionally transmitting antenna which are connected in order. The electromagnetic waves receiving circuit includes a receiving antenna, an amplified high-frequency small-signal filtering, a signal amplitude diction and a signal frequency sampling. One end of the amplified high-frequency small-signal filtering is connected to the receiving antenna and the other end is connected to the control module through the signal amplitude diction and the signal frequency sampling. Both the directionally transmitting antenna and the receiving antenna are located in the electromagnetism collecting box and the control module is connected with the signal source. Characterized by high operating performances, low producing costs and high-accuracy, the instrument is flexible to use and convenient to install and adjust.
Description
Technical field
The utility model relates to a kind of electromagnetic interference (EMI) instrument, specifically a kind of SCM Based space multistory electromagnetic interference (EMI) instrument.
Background technology
Science and technology development, promoted that not only the performance requirement of product is more and more higher, the continuous deterioration that has simultaneously also brought electromagnetic environment, in this case, electronic system is carried out the job stability that the environment electromagnetics disturbed test helps to improve product, also can be the most valuable experience of exploitation accumulation of homogeneous system.
In radiowave, 50 to 150MHz frequency-modulated wave is bigger to the interference that general micro-control circuit forms, if during outturn sample, it is simulated, just can measure the electronic product antijamming capability, by to improvement of circuit etc., further optimize properties of product, seek the equilibrium point of cost and actual performance.
Summary of the invention
The purpose of this utility model provides a kind of SCM Based space multistory electromagnetic interference (EMI) instrument, and this electromagnetic interference (EMI) instrument has been realized the electromagnetic wave conduction in the enclosure space, makes outside, unknown electromagnetic wave and test environment without any related.
The purpose of this utility model is achieved through the following technical solutions:
A kind of SCM Based space multistory electromagnetic interference (EMI) instrument, it is characterized in that: this electromagnetic interference (EMI) instrument comprises electromagnetism wave generation circuit, electromagnetic wave receiving circuit, electromagnetism collecting box, control module and power supply, and described electromagnetism wave generation circuit comprises that the signal source part, the amplifier section of high frequency small-signal, the high-frequency signal that connect successively drive power amplifier part and directional transmitting antenna; Described electromagnetic wave receiving circuit comprises amplification and filtering part, the amplitude detection part of signal and the frequency collection part of signal of receiving antenna, high frequency small-signal, one end of the amplification of high frequency small-signal and filtering part is connected with receiving antenna, and the other end is connected with control module by the amplitude detection part of signal and the frequency collection part of signal respectively; Directional transmitting antenna and receiving antenna all are positioned at the electromagnetism collecting box; Control module partly is connected with signal source.
In the utility model, control module adopts MSP430 series monolithic F4793 chip as control module, sends control word, the electromagnetic wave amplitude is carried out A/D collection and frequency collection and power monitoring for DDS AD9852.On control module, be provided with human-computer interaction interface.
The utility model adopts MSP430 series monolithic F4793 chip as control module, mainly sends control word, the electromagnetic wave amplitude is carried out A/D collection and frequency collection, human-computer interaction interface and system power supply are monitored to DDSAD9852.
1, bandwidth: upper frequency limit is subjected to the AD9852 restriction, can reach 200MHz in theory, considers that circuit disturbs and decay, adopts stop-band filter, and bandwidth constraints is 50 ~ 80MHz (can simply send test with common FM receiver like this).
2, frequency invariance: get 50,60,70 and four points of 80MHz, 50 Europe antenna loads, output gain are-3 ~-the 2DB interval, receiving sensitivity adopts high sensitivity radio receiver module acquired signal greater than-7DB, and signal quality is fine.
3, signal integrity: refer to the matching degree that transmits with received signal here, because AD9852 can realize frequency modulation (PFM), so the signal fidelity after the adding frequency modulation information directly reflects the electro-magnetic wave absorption and the annoyance level of equipment under test.
4, manufacture craft: the complete machine bandwidth reached high frequency (scope of 1M ~ 100M), element select and circuit design on Consideration more.Ring such as, signal is handled, and the impedance matching of signal wire is calculated, the layout of system (be integrated or be split as mother baby plate), operating process and Interface Design etc.
5, debugging: owing to finally take the mother baby plate integrated mode, each component debug is independent of each other, and debugging mainly comprises hardware debug, program debug and performance school accent.
The utility model provides the electromagnetic interference environment of an emulation for electronics, communication products exploitation enterprise.Realize the electromagnetic wave conduction in the enclosure space, made outside, unknown electromagnetic wave and test environment without any related.The utility model performance height, cost are low, high precision, flexible and convenient to use, Installation and Debugging are simple and direct.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model.
Embodiment
A kind of SCM Based space multistory electromagnetic interference (EMI) instrument described in the utility model, see Fig. 1, this electromagnetic interference (EMI) instrument comprises electromagnetism wave generation circuit 1, electromagnetic wave receiving circuit 2, electromagnetism collecting box 3, control module 4 and power supply 5, and electromagnetism wave generation circuit 1 comprises that the signal source part 11, the amplifier section 12 of high frequency small-signal, the high-frequency signal that connect successively drive power amplifier part 13 and directional transmitting antenna 14; Electromagnetic wave receiving circuit 2 comprises amplification and filtering part 22, the amplitude detection part 23 of signal and the frequency collection part 24 of signal of receiving antenna 21, high frequency small-signal, one end of the amplification of high frequency small-signal and filtering part 22 is connected with receiving antenna 21, and the other end is connected with control module 4 by the amplitude detection part 23 of signal and the frequency collection part 24 of signal respectively; Directional transmitting antenna 14 and receiving antenna 21 all are positioned at electromagnetism collecting box 3; Control module 4 is connected with signal source part 11.Entire circuit is by power supply 5 power supplies.
Electromagnetic wave generating device produces the waveform of amplitude, frequency adjustable, through the directional antenna emission; Electromagnetic receiving device is through directional receiving antenna, and electromagnetic wave is coupled, and gives each module through handling.
(1) electromagnetism wave generation circuit
1. signal source
Direct Digital frequency synthesis (DDS) is a kind of new frequency synthesis technique, and it is the theoretical and synthetic field of method pull-in frequency with advanced person's digital processing, and totally digitilized structure is convenient to realize program control.Adopt digital frequency synthesizer, the frequency switch speed is fast, is convenient to control, and is easy to realize, also can produce the high linear FM signal of the linearity, realizes the output of linear FM signal.The adjustable frequency of realizing by the AD9852 chip reaches 0 ~ 300MHz.
The DDS technology has widely to be used, and it can realize multiple spot, high some frequency of making an uproar mutually and frequency step output, can be used to realize communication modes such as MFSK, QPSK, can realize frequency-hopping mode in spread spectrum communication.
At present, the DDS chip series of QIALCOMM company has Q2220, Q2230 etc., and inside does not have integrated D/A; The DDS chip of ANALOG company has AD9850, AD9851, AD982 etc., and inner integrated height D/A uses more convenient.
Because the signal form that the utility model requires to produce has waveforms such as single-frequency continuous wave, pure-tone polse ripple, linear frequency modulation continuous wave, chirp, with AD9850 is the structure of basic DDS, do not support the output of linear fm waveform, and AD985 can export the point-frequency signal of high s/n ratio, support the output and the multiple mode of operation of linear fm waveform, support parallel and the serial line interface operation, data register and control register unified addressing, control is convenient.Therefore, this project adopts AD9852.
2. the amplification of high frequency small-signal
Because radio frequency power amplifier has the requirement of power lower limit to the input of signal, so at the small-signal amplification stage, must reach certain output power, gets 30mW here.Chip is selected THS3112 and the THS4021 current feedback type high frequency amplifier of TI.
3. high-frequency signal drives power amplifier
Adopt 1.8 to 175MHz bandwidth MC7210, this module requires lower to power input, be 7mW, and frequency gain curve is comparatively smooth, and gain supposes that for 25dB output power is 1W when 30MHz, by the conversion of Gp=10log (Po/Pi), getting power input only is 3.1mW.Concerning professional high-frequency model, the MC7210 cost performance is higher.
4. directional transmitting antenna
Emission coefficient for 50 ~ 150M, if adopt long straight conductor, what then antenna will become is very long, so with reference to general wireless Antenna Design, 3 meters long oil immersion leads are wrapped on the low sense bar magnet, take turns doing three, end lead of the same name is connected in series, such three groups have constituted a magnetic rod antenna array, and the directive property of directional transmissions is better.
(2) electromagnetic wave receiving circuit
Directional receiving antenna is made the reference orientation emitting antenna.
1. the amplification of high frequency small-signal and filtering
The signal that antenna collects is very faint and be mingled with noise (measured piece generation), thus to amplify and Filtering Processing it, owing to drive two-way (one road amplitude sample, one road frequency sampling) output, so should add the one-level voltage follower.
2. the amplitude detection of signal
This part is mainly to electromagnetic peak-to-peak value sampling, this value samples electromagnetic maximal value and minimum value corresponding to directional receiving antenna, owing to be in tuning range, so adopt the post processing module of " reinforced moral is given birth to PL-600 " wireless detecting circuit, feasible output reaches ± 2V, enough gives A/D sampling module.
3. the frequency collection of signal
Frequency collection uses the CPLD frequency measuring method: the signal that makes input is as clock signal, and through the frequency division of inner 1/K (K is adjustable), the cycle of coming out is very slow, at this moment again with single-chip microcomputer to its survey cycle, the value that draws will be very approaching accurately.Because the clock of CPLD is generally square wave, thus signal after passing through the amplification of high frequency small-signal and filtering to be carried out Schmidt's conversion here, and then give CPLD.
The employing amplitude is separated the benefit of measuring with frequency and has been saved whole cost exactly, if adopt DSP to add the scheme that high-speed a/d is gathered, cost will turn over several turning over, and debugging difficulty increases.
(3) electromagnetism collecting box
The electromagnetism collecting box mainly carries out spatial masking to electromagnetic wave, makes outside with inner electromagnetic wave isolate.Electromagnetic wave is passed to receiving antenna by emitting antenna through measured piece and finishes electromagnetic transmission loop.
(4) control module
Here adopt MSP430 series monolithic F4793 chip as control module, send control word, the electromagnetic wave amplitude is carried out A/D collection and frequency collection mainly for DDS AD9852, human-computer interaction interface and system power supply are monitored.
(5) power supply
Single-chip microcomputer 4793 is gathered each power supply of surveillance by A/D.
The utility model provides the electromagnetic interference environment of an emulation for electronics, communication products exploitation enterprise.Realize the electromagnetic wave conduction in the enclosure space, made outside, unknown electromagnetic wave and test environment without any related.
Claims (3)
1. SCM Based space multistory electromagnetic interference (EMI) instrument, it is characterized in that: this electromagnetic interference (EMI) instrument comprises electromagnetism wave generation circuit (1), electromagnetic wave receiving circuit (2), electromagnetism collecting box (3), control module (4) and power supply (5), and described electromagnetism wave generation circuit (1) comprises that the signal source part (11), the amplifier section (12) of high frequency small-signal, the high-frequency signal that connect successively drive power amplifier part (13) and directional transmitting antenna (14); Described electromagnetic wave receiving circuit (2) comprises amplification and filtering part (22), the amplitude detection part (23) of signal and the frequency collection part (24) of signal of receiving antenna (21), high frequency small-signal, one end of the amplification of high frequency small-signal and filtering part (22) is connected with receiving antenna (21), and the other end is connected with control module (4) by the amplitude detection part (23) of signal and the frequency collection part (24) of signal respectively; Directional transmitting antenna (14) and receiving antenna (21) all are positioned at electromagnetism collecting box (3); Control module (4) is connected with signal source part (11).
2. according to claims 1 described SCM Based space multistory electromagnetic interference (EMI) instrument, it is characterized in that: control module (4) adopts MSP430 series monolithic F4793 chip as control module, sends control word, the electromagnetic wave amplitude is carried out A/D collection and frequency collection and power monitoring for DDS AD9852.
3. according to claims 1 described SCM Based space multistory electromagnetic interference (EMI) instrument, it is characterized in that: on control module (4), be provided with human-computer interaction interface (41).
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201519111U CN201666927U (en) | 2010-04-06 | 2010-04-06 | Spatial and tridimensional electromagnetic interference instrument based on single chip micro-computer |
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| CN2010201519111U CN201666927U (en) | 2010-04-06 | 2010-04-06 | Spatial and tridimensional electromagnetic interference instrument based on single chip micro-computer |
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| CN201666927U true CN201666927U (en) | 2010-12-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293403A (en) * | 2012-02-29 | 2013-09-11 | 比亚迪股份有限公司 | Method for debugging signal transduction and antenna |
| CN104683045A (en) * | 2014-12-10 | 2015-06-03 | 中国人民解放军63888部队 | Testing method and testing system for instantaneous dynamic range of search receiver |
| CN106533609A (en) * | 2016-12-15 | 2017-03-22 | 深圳市飞思腾科技有限公司 | Digital signal interferometer |
| CN104683046B (en) * | 2013-11-29 | 2018-07-17 | 中国人民解放军63888部队 | A kind of analog receiver electromagnetic interference susceptibility test method and system |
| CN110275078A (en) * | 2019-07-16 | 2019-09-24 | 国网江苏省电力有限公司电力科学研究院 | Substation secondary cable earth-return harasses differentiating method, system and storage medium |
-
2010
- 2010-04-06 CN CN2010201519111U patent/CN201666927U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293403A (en) * | 2012-02-29 | 2013-09-11 | 比亚迪股份有限公司 | Method for debugging signal transduction and antenna |
| CN103293403B (en) * | 2012-02-29 | 2015-08-26 | 比亚迪股份有限公司 | The adjustment method of a kind of intracellular signaling and antenna |
| CN104683046B (en) * | 2013-11-29 | 2018-07-17 | 中国人民解放军63888部队 | A kind of analog receiver electromagnetic interference susceptibility test method and system |
| CN104683045A (en) * | 2014-12-10 | 2015-06-03 | 中国人民解放军63888部队 | Testing method and testing system for instantaneous dynamic range of search receiver |
| CN104683045B (en) * | 2014-12-10 | 2017-11-14 | 中国人民解放军63888部队 | A kind of scanning receiver instantaneous dynamic range method of testing and its system |
| CN106533609A (en) * | 2016-12-15 | 2017-03-22 | 深圳市飞思腾科技有限公司 | Digital signal interferometer |
| CN110275078A (en) * | 2019-07-16 | 2019-09-24 | 国网江苏省电力有限公司电力科学研究院 | Substation secondary cable earth-return harasses differentiating method, system and storage medium |
| CN110275078B (en) * | 2019-07-16 | 2021-10-15 | 国网江苏省电力有限公司电力科学研究院 | Method and system for distinguishing secondary cable ground loop disturbance of transformer substation and storage medium |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101208 Termination date: 20130406 |