CN102565546A - Electromagnetic radiation scanning and positioning method - Google Patents
Electromagnetic radiation scanning and positioning method Download PDFInfo
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Abstract
The invention relates to the technical field of electromagnetic radiation scanning and positioning, and aims to provide an electromagnetic radiation scanning and positioning method to replace the mechanical scanning technology, so that the electromagnetic radiation strength in each position of a circuit to be tested can be rapidly scanned and detected, a radiation source can be fixed, and continuous scanning and dynamic display can be realized. The method adopts an array type electromagnetic radiation detecting probe and the electronic switch technology, achieves unique spectrum and space scanning functions, and realizes the effects of scanning a selected area in a frequency range, and measuring the radiation circumstance of the whole frequency band in each special position of a tested object so as to obtain complete electromagnetic field information of the tested object. Data acquired by a scanning antenna under the control of electromagnetic scanning test software is subjected to fitting processing, so as to draw an electromagnetic radiation frequency spectrum and a spatial radiation cloud picture. The invention provides the method and equipment for the field of electromagnetic radiation measure, so as to quickly perform two-dimensional electromagnetic radiation scanning and positioning in a real-time manner.
Description
Technical field:
The present invention relates to electromagnetic radiation scanning field of locating technology.
Background technology:
In the electronic product invention, along with the raising of dominant frequency, the increase of wiring density, the use of many level scheme and ground level, power plane cutting techniques exists a large amount of radiation interference between signal in the pcb board, cause functions of the equipments fault or job insecurity.
The instrument that traditional debugging PCB searches fault comprises oscillograph, the logic analyser of time domain, and the equipment such as spectrum analyzer of frequency domain, but these means all can't provide the data of a reflection pcb board Global Information.Time domain equipment can only be observed the time domain waveform of or limited several signals; Frequency domain equipment also can only provide the frequency spectrum data of a frequency band of certain location point.If we can obtain to reflect the full detail of PCB duty, the debugging and the invention of pcb board had very big help.
The domestic mechanical scanning mode that generally adopts at present of electromagnetic radiation scanner; Scanning head is fixed on can be along on the moving scanning platform of X, y-axis shift; Drive scanning head by platform and scan, receive scan-data and record in addition by spectrum analyzer on the determinand surface.This scan mode exists sweep velocity slow, need reset drawbacks such as its sweep interval and scanning height to different determinands.
External existing plane electromagnetic radiation scanning device, the electromagnetic radiation that relies on small-sized exploring antenna array, electronic switch, Microwave Net to accomplish the space diverse location receives, and receives measurement data through spectrum analyzer.But present electromagnetic radiation scanning device makes that the measuring-signal loss is big, thereby directly influences the sensitivity of electromagnetic radiation scanning device owing to its Microwave Net design feature.Its receiving equipment adopts the standard frequency spectrum analyser, and sweep velocity is slow, can't show in real time, dynamically that the determinand electromagnetic radiation changes.
At present, can carry out electromagnetic radiation scanning fast, dynamic real-time shows that the electromagnetic radiation scanning device of electromagnetic radiation distribution plan does not appear in the newspapers at home and abroad.
Summary of the invention:
Technical matters to be solved by this invention provides a kind of electromagnetic radiation scanning localization method; Adopt array electromagnetic radiation detection probe and electronic switching technology; Replace mechanical scanning technique, the electromagnetic radiation intensity of each position of scanning probe circuit under test is located radiation source fast; Realize continuous sweep, dynamically show.
A kind of electromagnetic radiation scanning localization method is characterized in that: adopt scanning antenna, pre-low-noise amplifier, ON-OFF control circuit, stabilized voltage supply, spectrum analyzer, control computer to form the electromagnetic radiation scanner; The array formed by the plurality of magnetic Field probe of scanning antenna wherein, each probe all has independently CS, and the printed board top layer of detecting plate is the magnet field probe array, and bottom is an on-off circuit, and the centre is a ground plane, connects through plated-through hole between the top layer bottom.Through the switching of switch, the probe on the gating detecting plate makes the signal on the probe be detected through receiver arbitrarily, like this, switches each switch in turn, just can survey and locatees the electromagnetic radiation intensity of each position on the circuit board;
Said pre-low-noise amplifier is used for faint radiofrequency signal is amplified; Said ON-OFF control circuit is used for the aerial array switch is controlled, and determinand is scanned, and timesharing receives the ELECTROMAGNETIC RADIATION SIGNATURE in each orientation; Said stabilized voltage supply is used to provide microwave switch circuit and the required D.C. regulated power supply of control circuit; The microwave signal that said spectrum analyzer is used for system is received is carried out spectrum analysis, draws the frequency information and the amplitude information of signal.The parameter setting of spectrum analyzer and scanning process are by computer control, and be synchronous with day line traffic control to guarantee scanning, obtains correct electromagnetic radiation space distribution.
Control computer is used for totally controlling the operation of electromagnetic radiation scanning system, comprises that duplexer switches, and the spectrum analysis instrument parameter is provided with and scanning, and scan-data obtains, and man-machine interface is mutual, data processing, electromagnetic radiation data demonstration work.The control of duplexer realizes through the IO expansion card in the control computer, is connected with the communication of spectrum analyzer through the GPIB expansion card and realizes.
Said electromagnetic radiation scanner is realized the scanning location through following steps:
At first control computer initialization GPIB card and IO card; Frequency spectrograph equipment on the search gpib bus again according to different scanning bands, is selected suitable scanning antenna for use; When scanning band is that 100MHz selects low-frequency antenna for use when following, select high frequency antenna more than the 100MHz for use.
Because the coupling coefficient of antenna is little during low frequency, sensitivity is low, and therefore the sensitivity when improving low frequency must reduce resolution bandwidth, like this by computing machine according to the required parameter request that comprises scanning band, sensitivity, through control bus gated sweep antenna; Through gpib interface control spectrum analyzer, different frequent points is scanned, and pass the data that scanning obtains back computing machine through GPIB simultaneously; At last, carry out match according to scan-data, draw out Spectrum of Electromagnetic Radiation figure and space radiation cloud atlas by computing machine.
The present invention brings following beneficial effect:
To above problem; The present invention has unique frequency spectrum, spacescan function; Can carry out the scanning of a frequency range to selection area, measure the radiation event of whole frequency band on each locus of measured object, thereby obtain the complete electromagnetic field information of measured object.Data through electromagnetic scanning testing software gated sweep antenna is obtained are passed through process of fitting treatment; Draw out Spectrum of Electromagnetic Radiation figure and space radiation cloud atlas, for the electromagnetic radiation measuring field provides a kind of method and apparatus that can carry out two-dimensional electromagnetic radiation scanning location fast, in real time.
Description of drawings:
The composition frame chart of Fig. 1 system
Fig. 2 magnet field probe system of battle formations
Fig. 3 electronic switch switches composition frame chart
Fig. 4 electromagnetic compatibility test software architecture diagram
Fig. 5 data stream is moved towards synoptic diagram
Fig. 6 two-dimensional electromagnetic radiation scanning cloud atlas
The spectrogram of the whole scanning band of Fig. 7
The operating process of Fig. 8 man-machine interface
Embodiment:
The electromagnetic radiation scanner mainly is made up of scanning antenna, pre-low-noise amplifier, ON-OFF control circuit, stabilized voltage supply, spectrum analyzer, control computer and related software.The composition frame chart of system is as shown in Figure 1.The array formed by a series of magnet field probe of scanning antenna wherein, each probe all has independently CS, and the printed board top layer is an antenna probes, and bottom is an on-off circuit, and the centre is a ground plane, connects through plated-through hole between the top layer bottom.Through the switching of switch, the probe on the gating detecting plate makes the signal on the probe be detected through receiver arbitrarily, like this, switches each switch in turn, just can survey and locatees the electromagnetic radiation intensity of each position on the circuit board.The magnet field probe system of battle formations is as shown in Figure 2, and it is as shown in Figure 3 that electronic switch switches composition frame chart.
Pre-low-noise amplifier is responsible for faint radiofrequency signal is amplified.ON-OFF control circuit is responsible for the aerial array switch is controlled, and determinand is scanned, and timesharing receives the ELECTROMAGNETIC RADIATION SIGNATURE in each orientation.Stabilized voltage supply is responsible for providing microwave switch circuit and the required D.C. regulated power supply of control circuit.Spectrum analyzer is responsible for the microwave signal that system receives is carried out spectrum analysis, draws the frequency information and the amplitude information of signal.The parameter setting of spectrum analyzer and scanning process are by the control of the scanning software on the computing machine, and be synchronous with day line traffic control to guarantee scanning, obtains correct electromagnetic radiation space distribution.Control computer is responsible for the operation of overall control electromagnetic radiation scanning system, comprises that duplexer switches, and the spectrum analysis instrument parameter is provided with and scanning, and scan-data obtains, and man-machine interface is mutual, data processing, work such as electromagnetic radiation data demonstration.The control of duplexer realizes through the IO expansion card in the control computer, is connected with the communication of spectrum analyzer through the GPIB expansion card and realizes.
Software section mainly comprises electromagnetic compatibility test software, the GPIB Control Software, and the bus Control Software, establishment is installed in the operation of calculating hands-operation after generating executable file.The electromagnetic compatibility test software architecture diagram is as shown in Figure 4.The principle of work of total system testing software is: at first by software initialization GPIB card and IO card; Frequency spectrograph equipment on the search gpib bus; Again according to different scanning bands; Select suitable scanning antenna for use,, select high frequency antenna more than the 100MHz for use when scanning band is that 100MHz selects low-frequency antenna for use when following.Because the coupling coefficient of antenna is little during low frequency, sensitivity is low, and therefore the sensitivity when improving low frequency must reduce resolution bandwidth, like this by computing machine according to parameter requests such as required scanning band, sensitivity, through control bus gated sweep antenna; Through gpib interface control spectrum analyzer, different frequent points is scanned, and pass the data that scanning obtains back computing machine through GPIB simultaneously; At last, carry out match according to scan-data, draw out Spectrum of Electromagnetic Radiation figure and space radiation cloud atlas by computing machine.At first in Matlab software, compiler is set, configuration deploymenttool window compiles the signal Processing function of writing, and compiling accomplishes that back interpolation under the C# environment is quoted and the correlative code of call function has just been accomplished the data interpolating processing.Moving towards of data stream is as shown in Figure 5.
Portable computer is responsible for the parameters such as frequency band of required scanning are transferred in the signal processor, and the data in real time of handling well is shown.Data after the processing are divided into two kinds of one dimension radiation intensity distribution figure and two-dimensional radiation intensity distributions: one dimension radiation intensity distribution figure does not consider the locus of radiation; Only get the maximal value of radiation intensity on the same frequency, it has represented the frequency distribution information of radiation intensity in the circuit under test; The two-dimensional radiation intensity distribution shows the information of radiation intensity and its locus.For the information such as electromagnetic radiation distribution and field intensity that effectively realize directly perceived more, we adopt the display mode of two-dimentional cloud atlas formula.Black is represented the stronger zone of radiation intensity, and white is represented more weak zone, represents the difference of this place's radiation intensity so respectively with the difference of color, can more clearly show the variation of intensity.
The present invention can obtain one group of data to carrying out spacescan in frequency range of selection area to each probe.Because the grid of scanner can not be accomplished closely unlimited, so the data jumping characteristic that obtains is bigger.Limited to data volume, the rough defective of display result, we take the data processing method of interpolation to come the variation of level and smooth intensity.
In the invention, the raw data that we obtain scanning is read in MATLAB software, carries out the interpolation calculation of three rank or higher order, and the data that then interpolation obtained send former C# master routine to and show.Very little through the resulting data jumping characteristic of interpolation, the spacescan cloud atlas that obtains is more level and smooth.
In addition, in view of external electromagnetic environment more complicated, in order to show main radiation source more clearly; We have increased contrast and saturation degree slider bar in software invention part, and the user can highlight the main radiation source that influences circuit board through the free adjustment to these two options; And other collateral radiation interference sources are filtered; The better effects if of resulting like this scanning cloud atlas more can reflect the actual conditions of circuit board really, helps accurately locating the position of electromagnetic radiation source.
Through adopting the level and smooth data processing technique of interpolation, frequency spectrum and space scan function simultaneously, this system has continuous sweep, dynamic technique for displaying effect, is in particular in the following aspects:
(1) can realize the scanning of electromagnetic radiation DYNAMIC DISTRIBUTION.
Through the signal in certain bandwidth is carried out continuous sweep and peak-value-holding function, can capture the electromagnetic interference signal of transient state, show the DYNAMIC DISTRIBUTION of electromagnetic radiation in real time, for field adjustable and Transient Electromagnetic actinometry provide very big convenience.
(2) powerful backstage is analyzed and processing power.
Because the distinctive frequency spectrum of this product, spacescan function, the data that obtain are the complete EM information of measured object, therefore can after measuring end, carry out careful multianalysis to measurement result.Like synthetic frequency spectrum function and blended space function, need not to measure once more, but synthetic spectrogram is checked in the combination in any locus that perhaps the combination in any Frequency point is checked spatial distribution map.
(3) accuracy and the repeatability measured have been improved.
The present invention has adopted quick scanning technique and advanced amplitude thereof to keep scanning technique and synchronous scanning technology; Make this system can effectively catch transient affair; Adopt the technology that can promote the spectrum analyzer measuring accuracy simultaneously, improved accuracy and the repeatability measured.
(4) greatly improved sweep velocity.
Mechanical scanning system is the data of the limited several Frequency points of energy measurement only, and when Frequency point increased, it is very slow that speed can become, and adopt the electronic switch handoff technique, than mechanical scanning speed very big raising are arranged; The special digital receiver makes the electromagnetic radiation sweep velocity that very big raising arranged in addition.Optimize scanning algorithm simultaneously and further accelerated sweep velocity.
(5) installation, operation and maintenance are conveniently.
The operator need not to understand the principle and the operation of broadband receiver and digital signal processor; All operations all can be accomplished in the Chinese interface of terminal computer; And all devices of this product are electronic installation, and simple and convenient is installed, and therefore maintainable and reliability has obtained effective guarantee.
Portable electromagnetic radiation scanning orientator automatic test software is responsible for receiving various parameter settings, like scanning beginning frequency, cutoff frequency, resolution bandwidth, system-gain (datum) etc.; The array antenna control module according to the driver of a definite sequence through call number IO control card, is sent control signal to array antenna according to the scanning requirement, accomplishes the scanning of array antenna; The spectrum analyzer control module is carried out frequency sweeping according to the start-stop frequency of scanning through GPIB control card control spectrum analyzer; Image processing module obtains spectrum scan information through the GPIB control card equally from spectrum analyzer, the scan control of associated matrix array antenna again forms the spectrogram (Fig. 7) of two-dimensional electromagnetic radiation scanning cloud atlas (Fig. 6) and whole scanning band.
Because the low-frequency range antenna has only 16 * 16 unit, so spatial resolution is lower, display effect is also relatively poor, can not represent the space distribution of electromagnetic radiation well.So adopt the method for interpolation that original image is handled, raw data is read in MATLAB software, to carry out three times or the interpolation calculation of higher order, the data after the processing are passed former master routine again back and are shown.Very little through resulting data jumping characteristic after the interpolation processing, the spacescan cloud atlas that obtains is more level and smooth.
This software can also mark the peak value of spectrum value, and accesses corresponding two-dimensional scan cloud atlas, also can be through preserving, open button scan-data is preserved, practice thrift sweep time when using these frequency range data once more, and be convenient to interpretation of result and processing.
Portable electromagnetic radiation scanning orientator is a kind of electromagnetic radiation scanning device, and its major function is frequency of electromagnetic radiation, intensity and the two-dimensional space distributed intelligence of measuring Devices to test.This achievement is based on two-dimensional electromagnetic radiation scanning array antenna technology and electronic switching technology; Adopt the flat array antenna of high density, two-dimentional microwave switch network and quick scanning algorithm; Solved problems such as traditional mechanical formula electromagnetic radiation scanner volume is big, sweep velocity is slow, method of application is loaded down with trivial details, made the electromagnetic radiation scanner can carry out the two-dimensional measurement of electromagnetic radiation fast, in real time, effectively.The operational flowchart of man-machine interface is as shown in Figure 8.Concrete workflow is following:
(1) click refresh button, GPIB partly is shown as the model of the spectrum analyzer that scans;
(2) click SR, various piece is resetted and initialization by the internal system computing machine;
(3) start-stop frequency, resolution bandwidth, the datum of scanning are set, accomplish the back and click button is set, set parameters is updated, the setting of spectrum analyzer completion each item content;
(4) whether carry out the several times single sweep operation, it is normal to work between detection software and the instrument.As in proper working order, then obtain the single pass data, a spectral line appears among the single sweep operation figure, and the same with display result on the frequency spectrograph;
(5) carry out rescan, the progress bar of bottom, interface begins to slide, and waits for scanning result;
(6) end of scan ejects 3 D stereo scintigram and two-dimensional scan cloud atlas; Wherein the black in the scintigram is represented the stronger zone of radiation intensity, and white is represented more weak zone, represents the difference of this place's radiation intensity so respectively with the difference of color, can more clearly show the variation of intensity.Can regulate the two-dimensional scan cloud atlas this moment through regulating contrast and saturation degree slider bar, and the filtering interfering electromagnetic radiation obtains scanning result more clearly;
(7) manual scanning is mainly used in the single-point debugging, through any one position in 16 * 16 probes on the scanning array antenna is set, checks whether the single sweep operation result is correct, and scanning result shows in single sweep operation figure;
Spectrogram when (8) showing maximum radiant intensity in the spectrogram, and mark corresponding strength and pairing frequency.
Claims (2)
1. an electromagnetic radiation scanning localization method is characterized in that: adopt scanning antenna, pre-low-noise amplifier, ON-OFF control circuit, stabilized voltage supply, spectrum analyzer, control computer to form the electromagnetic radiation scanner; The array formed by the plurality of magnetic Field probe of scanning antenna wherein, each probe all has independently CS, and the printed board top layer of detecting plate is the magnet field probe array, and bottom is an on-off circuit, and the centre is a ground plane, connects through plated-through hole between the top layer bottom; Through the switching of switch, the probe on the gating detecting plate makes the signal on the probe be detected through receiver arbitrarily, like this, switches each switch in turn, just can survey and locatees the electromagnetic radiation intensity of each position on the circuit board;
Said pre-low-noise amplifier is used for faint radiofrequency signal is amplified; Said ON-OFF control circuit is used for the aerial array switch is controlled, and determinand is scanned, and timesharing receives the ELECTROMAGNETIC RADIATION SIGNATURE in each orientation; Said stabilized voltage supply is used to provide microwave switch circuit and the required D.C. regulated power supply of control circuit; The microwave signal that said spectrum analyzer is used for system is received is carried out spectrum analysis, draws the frequency information and the amplitude information of signal; The parameter setting of spectrum analyzer and scanning process are by computer control, and be synchronous with day line traffic control to guarantee scanning, obtains correct electromagnetic radiation space distribution;
Control computer is used for totally controlling the operation of electromagnetic radiation scanning system, comprises that duplexer switches, and the spectrum analysis instrument parameter is provided with and scanning, and scan-data obtains, and man-machine interface is mutual, data processing, electromagnetic radiation data demonstration work; The control of duplexer realizes through the IO expansion card in the control computer, is connected with the communication of spectrum analyzer through the GPIB expansion card and realizes.
2. an electromagnetic radiation scans localization method, it is characterized in that: said electromagnetic radiation scanner is realized the scanning location through following steps:
At first control computer initialization GPIB card and IO card; Frequency spectrograph equipment on the search gpib bus again according to different scanning bands, is selected suitable scanning antenna for use; When scanning band is that 100MHz selects low-frequency antenna for use when following, select high frequency antenna more than the 100MHz for use;
Because the coupling coefficient of antenna is little during low frequency, sensitivity is low, and therefore the sensitivity when improving low frequency must reduce resolution bandwidth, like this by computing machine according to the required parameter request that comprises scanning band, sensitivity, through control bus gated sweep antenna; Through gpib interface control spectrum analyzer, different frequent points is scanned, and pass the data that scanning obtains back computing machine through GPIB simultaneously;
At last, carry out match according to scan-data, draw out Spectrum of Electromagnetic Radiation figure and space radiation cloud atlas by computing machine.
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| CN102818941A (en) * | 2012-08-08 | 2012-12-12 | 北京交通大学 | Electromagnetic radiation emission measurement method in outfield disturbed environment |
| CN103560839A (en) * | 2013-10-28 | 2014-02-05 | 中国电子科技集团公司第四十一研究所 | Method and device for realizing high-speed scanning of electromagnetic radiation interference testing receiver |
| CN103941106A (en) * | 2014-04-29 | 2014-07-23 | 工业和信息化部电子第五研究所 | Electromagnetic field near-field scanning device and scanning method |
| CN104330625A (en) * | 2014-09-22 | 2015-02-04 | 中国科学院云南天文台 | Automatic radio environment test platform based on Labview and third-party driving program |
| WO2015113153A1 (en) * | 2014-01-30 | 2015-08-06 | Emscan Corporation | Scanner system and method for high-resolution spatial scanning of an electromagnetic field radiated by an electronic device under test |
| CN105044587A (en) * | 2015-04-30 | 2015-11-11 | 中国电子科技集团公司第四十一研究所 | Electromagnetic radiation test-based microwave circuit fault diagnosis device and method |
| CN105629080A (en) * | 2015-12-24 | 2016-06-01 | 武汉瑞天波谱信息技术有限公司 | Drawing method of electromagnetic distribution situation diagram or path electromagnetic distribution diagram |
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| CN107870272A (en) * | 2017-10-11 | 2018-04-03 | 上海无线电设备研究所 | Electromagnetic interference quick detection and recognition methods under a kind of small space |
| CN108763011A (en) * | 2018-03-27 | 2018-11-06 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | SoC chip check figure detection method, device, system and storage medium |
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| CN114076888A (en) * | 2021-11-17 | 2022-02-22 | 北京芯同汇科技有限公司 | Circuit board radiation field frequency spectrum component measuring device and circuit board operation detection method |
| CN114675088A (en) * | 2022-05-27 | 2022-06-28 | 浙江大学 | Unsupervised learning radiation source rapid near-field scanning method |
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| CN102818941A (en) * | 2012-08-08 | 2012-12-12 | 北京交通大学 | Electromagnetic radiation emission measurement method in outfield disturbed environment |
| CN103353555B (en) * | 2013-07-10 | 2016-08-31 | 浙江先芯科技有限公司 | Portable low power-consumption electromagnet radiation detection instrument and detection method |
| CN103560839A (en) * | 2013-10-28 | 2014-02-05 | 中国电子科技集团公司第四十一研究所 | Method and device for realizing high-speed scanning of electromagnetic radiation interference testing receiver |
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| CN103941106A (en) * | 2014-04-29 | 2014-07-23 | 工业和信息化部电子第五研究所 | Electromagnetic field near-field scanning device and scanning method |
| CN104330625A (en) * | 2014-09-22 | 2015-02-04 | 中国科学院云南天文台 | Automatic radio environment test platform based on Labview and third-party driving program |
| CN105044587A (en) * | 2015-04-30 | 2015-11-11 | 中国电子科技集团公司第四十一研究所 | Electromagnetic radiation test-based microwave circuit fault diagnosis device and method |
| CN105629080B (en) * | 2015-12-24 | 2018-06-26 | 武汉瑞天波谱信息技术有限公司 | A kind of method for drafting of electromagnetism distribution situation map or path electromagnetism distribution map |
| CN105629080A (en) * | 2015-12-24 | 2016-06-01 | 武汉瑞天波谱信息技术有限公司 | Drawing method of electromagnetic distribution situation diagram or path electromagnetic distribution diagram |
| CN107703386A (en) * | 2017-09-27 | 2018-02-16 | 深圳市科卫泰实业发展有限公司 | A kind of method for measuring product E MC problem particular locations |
| CN107870272A (en) * | 2017-10-11 | 2018-04-03 | 上海无线电设备研究所 | Electromagnetic interference quick detection and recognition methods under a kind of small space |
| CN108763011A (en) * | 2018-03-27 | 2018-11-06 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | SoC chip check figure detection method, device, system and storage medium |
| CN108957192A (en) * | 2018-07-26 | 2018-12-07 | 北京经纬恒润科技有限公司 | A kind of electromagnetic interference diagnosing system and method |
| CN108957192B (en) * | 2018-07-26 | 2021-03-23 | 北京经纬恒润科技股份有限公司 | Electromagnetic interference diagnosis system and method |
| CN114076888A (en) * | 2021-11-17 | 2022-02-22 | 北京芯同汇科技有限公司 | Circuit board radiation field frequency spectrum component measuring device and circuit board operation detection method |
| CN114675088A (en) * | 2022-05-27 | 2022-06-28 | 浙江大学 | Unsupervised learning radiation source rapid near-field scanning method |
| CN114675088B (en) * | 2022-05-27 | 2022-08-23 | 浙江大学 | Unsupervised learning radiation source rapid near-field scanning method |
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Application publication date: 20120711 |