CN103166606B - The method and apparatus that digital pulse signal is screened - Google Patents
The method and apparatus that digital pulse signal is screened Download PDFInfo
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Abstract
The present invention relates to a kind of method and apparatus that digital pulse signal is carried out examination process.The method specifically includes that the threshold value of each criteria parameter setting digital pulse signal respectively, and described method specifically includes: adopt parallel pipeline working method to obtain multiple criteria parameter of digital pulse signal in real time；When each criteria parameter in the plurality of criteria parameter meets the threshold value of described setting, then judge that described digital pulse signal is effective digital pulse signal.The embodiment of the present invention is owing to have employed the method that many criterions parallel pipeline processes in real time, not only real-time performance is significantly high, if the difference that digital pulse signal also exists on waveform, can serve as a criteria parameter to carry out particle sizing, therefore, it is possible to distinguish the pulse with different wave feature to greatest extent.
Description
Technical field
The present invention relates to signal processing technology field, particularly relate to a kind of method and apparatus that digital pulse signal is screened.
Background technology
PSD (PulseShape-discrimination, pulse shape discriminator) technology realizes particle mainly for the difference of impulse waveform and sentences choosing.Traditional PSD technology is main with APSD (AnalogPSD, analog pulse waveform is screened), mostly utilizes charge integration and zero passage to screen and realizes.APSD precision is higher, but counting rate dynamic range is relatively low, it does not have weight disposal ability, and circuit is complicated, and integrated level is low.
In recent years, along with improving constantly of ADC (AnaloguetoDigitalConverter, analog-digital converter) performance, DPSD (digitalPSD, digital pulse forms is screened) technology starts to be widely used.DPSD generally utilizes high-speed ADC that input signal is sampled, then sampled signal carries out examination process (such as integration, peak-seeking etc.).Along with improving constantly of high-speed ADC sample rate, the examination precision of DPSD is expected to meet or exceed general APSD.The advantage of DPSD essentially consists in integrated level height, carries out examination process just for digital signal, it is simple to process, and flexible and changeable, and extensibility is strong.
But, current DPSD technology yet suffers from some problems, and first, poor real, the dead time is bigger；Second, due to merely with the ratio of integration in waveform zones of different as basis for estimation, signal screening effect is not ideal enough, and can only adapt to some and specifically measure, and the scope of application is very narrow.
Summary of the invention
The embodiment provides a kind of method and apparatus that digital pulse signal is screened, to realize digital pulse signal is screened effectively.
A kind of method that digital pulse signal is carried out examination process, sets the threshold value of each criteria parameter of digital pulse signal respectively, and described method specifically includes:
Obtain multiple criteria parameter of digital pulse signal；
When each criteria parameter in the plurality of criteria parameter meets the threshold value of described setting, then judge that described digital pulse signal is effective digital pulse signal.
A kind of device that digital pulse signal is carried out examination process, described method specifically includes:
Threshold value setting module, for setting the threshold value of each criteria parameter of digital pulse signal respectively
Criteria parameter acquisition module, obtains multiple criteria parameter of digital pulse signal to be screened；
Judging treatmenting module, for when threshold value set by each criteria parameter in multiple criteria parameter that described criteria parameter acquisition module is acquired meets described threshold value setting module, then judging that described digital pulse signal is effective digital pulse signal.
The technical scheme provided by embodiments of the invention described above can be seen that, the embodiment of the present invention is owing to have employed the method that many criterions parallel pipeline processes in real time, not only real-time performance is significantly high, if the difference that digital pulse signal also exists on waveform, can serve as a criteria parameter to carry out particle sizing, therefore, it is possible to distinguish the pulse with different wave feature to greatest extent.
Accompanying drawing explanation
The complete process flow figure of the discriminating method of the pulse signal of a kind of many criterions parallel pipeline real-time online that Fig. 1 provides for the embodiment of the present invention one；
The principle schematic of a kind of method that inside FPGA, digital pulse signal is carried out examination process that Fig. 2 provides for the embodiment of the present invention one；
The concrete process chart of a kind of method that inside FPGA, digital pulse signal is carried out examination process that Fig. 3 provides for the embodiment of the present invention one；
The concrete structure figure of a kind of device that digital pulse signal is carried out examination process that Fig. 4 provides for the embodiment of the present invention two.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing, it is clearly and completely described with the method and apparatus example that the invention process pulse signals is screened.
Embodiment one
This embodiment offers the discriminating method of the pulse signal of a kind of many criterions parallel pipeline real-time online, the complete process flow of the method is as shown in Figure 1.Wait the pulse signal screened after signal condition and anti-aliasing filter process, entrance high-speed ADC completes the digitized processing of pulse signal and obtains digital pulse signal, then use FPGA (FieldProgrammableGateArray, field programmable gate array) that digital pulse signal carries out the real-time parallel examination of many criterions to process.
The principle schematic of a kind of method that digital pulse signal carries out examination process inside FPGA that this embodiment provides is as in figure 2 it is shown, the concrete handling process of the method is as it is shown on figure 3, include following process step:
Step S301, the digital pulse signal being input to FPGA is carried out serioparallel exchange, noise examination process, from digital pulse signal, extract effective particle pulse signal.
After entering FPGA from the digital pulse signal of high-speed ADC output, first can pass through serioparallel exchange and process the frequency reducing digital pulse signal.Such as, the digital pulse signal of 250,000,000 12bit is converted to the digital pulse signal of 125,000,000 24bit.Above-mentioned serioparallel exchange process can the process dominant frequency of FPGA, alleviate sequential pressure.Utilize noise examination to process the noise signal removing in above-mentioned digital pulse signal, from above-mentioned digital pulse signal, extract effective particle pulse signal.
Step S302, obtain the peak value of above-mentioned particle pulse signal by numeral peak-seeking, store the multiple particle pulse signal of continuous print by one or more memorizer.
After extracting effective particle pulse signal when utilizing noise examination to process, this particle pulse signal is carried out simultaneously two operations: one is by numeral peak-seeking obtains the peak value of this particle pulse signal, numeral peak-seeking can adopt maximum value process or derivative method, the process of maximum value process peak-seeking is: after a particle pulse signal arrives, set a peak value depositor and be initialized as 0, if the numerical value of current PRF data stream is more than described peak value register value, then current data is stored in peak value depositor, then new peak value register value and follow-up pulse data fluxion value is used to compare, so when after a valid data end-of-pulsing, numerical value in peak value depositor is the peak value of this particle pulse signal.The process of derivative method peak-seeking is: after an effective particle pulse signal arrives, it is the shift register of 3 by the data stream of this particle pulse signal by a degree of depth, 3 data in a shift register (are designated as D1 successively, D2, D3) after being all assigned significant digits pulse data, whether Rule of judgment " D1 < D2 and D3 < D2 " is set up, if setting up, then latches the peak value that value is current PRF of D2；Otherwise, wait judges next time.
Another is to be stored in by particle pulse signal in the memorizeies such as RAM (RandomAccessMemory, random access memory), to wait follow-up process.
The embodiment of the present invention arranges the memorizeies such as one or more RAM in FPGA, is used for switching or the annular storage multiple particle pulse signal of continuous print.When switching the multiple digital pulse signals of storage, each memorizer one digital pulse signal of storage by multiple memorizeies, multiple for continuous print digital pulse signals are respectively stored in multiple memorizer.
When storing multiple digital pulse signal by a toroidal memory, multiple for continuous print digital pulse signals are stored in which memory in a certain order.
Such as, when adopting two RAM as shown in Figure 2, then first RAM stores first particle pulse signal, second particle pulse signal that second RAM storage is follow-up.
Step S303, obtain multiple criteria parameter of above-mentioned particle pulse signal, the combined threshold value that the combination of the threshold value corresponding according to each criteria parameter or two or more criteria parameter is corresponding, above-mentioned particle pulse signal is carried out examination process.
When switching the multiple digital pulse signals of storage by multiple memorizeies, processing module adopts parallel pipeline working method, and extracting digital pulse signal successively from the plurality of memorizer carries out examination process in real time；Or；When storing multiple digital pulse signal by a toroidal memory, each digital pulse signal extracted successively from described toroidal memory in the plurality of digital pulse signal carries out examination process.
Such as, when adopting two RAM as shown in Figure 2, processing module reads first particle pulse signal from first RAM, peak value in conjunction with this first the particle pulse signal obtained, each criteria parameter of first particle pulse signal is obtained, and the criteria parameter of acquisition specifically includes that the integration and other parameters to be extended etc. of pulsewidth, rise time, fall time, waveform total mark, waveform head integration (integration of ascent stage), waveform afterbody integration (integration of decline stage), waveform area-of-interest.In actual applications, it is possible to one or more choosing in above-mentioned criteria parameter according to practical application scene carries out judgement process.
In embodiments of the present invention, it is necessary to above-mentioned each criteria parameter is respectively provided with a threshold value, this threshold value can be a numerical value or a numerical range.
After each criteria parameter obtaining above-mentioned first particle pulse signal, this first particle pulse signal will be screened parallel by comparison operators compound module according to the criterion threshold value set, if all of criteria parameter all meets the requirement of corresponding threshold value, then judge that this first particle pulse signal is effective digital pulse signal, by this first particle pulse signal output；Otherwise, this first particle pulse signal is abandoned.
The purpose that the embodiment of the present invention stores continuous print multiple particle pulse signal by memorizer is in that upper particle pulse signal next one particle pulse signal while carrying out processing can also store, so that the dead time that particle pulse signal is carried out examination process by processing module is greatly reduced, even for 0.
It should be noted that, due in some occasion, two particle pulse signals are likely on independent criteria parameter essentially identical, but in the combination of two criteria parameter or multiple criteria parameter, there is bigger difference, for instance ratio of conventional waveform head integration and the ratio of waveform total mark, waveform afterbody integration and waveform total mark etc..Therefore, in actual applications, it is also possible to the combined threshold value that the combination of above-mentioned two or multiple criteria parameter is corresponding is set.In comparison operators compound module, except each independent criteria parameter is compared, according to combinations thereof threshold value, the combination of two or more criteria parameter of particle pulse signal can also be carried out judgement process, when the said two of described particle pulse signal or multiple criteria parameter meet described combined threshold value, then judge that described particle pulse signal is effective digital pulse signal.
Embodiment two
This embodiment offers a kind of device that digital pulse signal is carried out examination process, its concrete structure as shown in Figure 4, the module including following:
Threshold value setting module 41, for setting the threshold value of each criteria parameter of digital pulse signal respectively.
Criteria parameter acquisition module 42, for adopting parallel pipeline working method to obtain multiple criteria parameter of digital pulse signal to be screened in real time, multiple criteria parameter of described digital pulse signal include: pulsewidth, the rise time, fall time, waveform total mark, waveform head integration, waveform afterbody integration, waveform area-of-interest integration in one or more.
Judging treatmenting module 43, for when threshold value set by each criteria parameter in multiple criteria parameter that described criteria parameter acquisition module is acquired meets described threshold value setting module, then judging that described digital pulse signal is effective digital pulse signal.
Further, described device can also include:
Signal memory module 44, for switching the multiple digital pulse signals of storage by multiple memorizeies, each memorizer stores a digital pulse signal, or；Multiple digital pulse signal is stored by a toroidal memory.
Concrete, described criteria parameter acquisition module 42, it is additionally operable to work as described signal memory module and switches the multiple digital pulse signals of storage by multiple memorizeies, from the plurality of memorizer, extract digital pulse signal successively carry out examination process, or；When described signal memory module stores multiple digital pulse signal by a toroidal memory, each digital pulse signal extracted successively from described toroidal memory in the plurality of digital pulse signal carries out examination process.
Concrete, described criteria parameter acquisition module 42, it is additionally operable to be input in FPGA by digital pulse signal, the frequency reducing described digital pulse signal is processed by serioparallel exchange, utilize noise examination to process the noise signal removing in described digitized pulse signal, from described digitized pulse signal, extract effective particle pulse signal；
Process, by numeral peak-seeking, the peak value obtaining described particle pulse signal, and described particle pulse signal is stored in memorizer.
Concrete, described threshold value setting module 41, it is additionally operable to arrange the combined threshold value of the combination correspondence of said two or multiple criteria parameter；
Described judging treatmenting module 43, is additionally operable to when the said two of described digital pulse signal or multiple criteria parameter meet described combined threshold value, then judge that described digital pulse signal is effective digital pulse signal.
The concrete processing procedure that digital pulse signal is carried out examination process by the device of the application embodiment of the present invention is similar with preceding method embodiment, repeats no more herein.
The invention described above embodiment has been successfully applied to ITER (International Thermal-Nuclear Experimental Reactor plan, InternationalThermonuclearExperimental) NFM (NeutronFluxMonitor in international cooperative project, neutron flux monitoring) system, realize many criterions parallel pipeline real-time online to screen, carry out γ, α and the rejecting of background ray, extract neutron signal.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, can be by the hardware that computer program carrys out instruction relevant to complete, described program can be stored in a computer read/write memory medium, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc..
In sum, the embodiment of the present invention method owing to have employed the parallel processing of many criterions, as long as the difference that digital pulse signal also exists on waveform, can serve as a criteria parameter to carry out particle sizing, therefore the method can distinguish the pulse with different wave feature to greatest extent.
The embodiment of the present invention stores the multiple digital pulse signal of continuous print by using the memorizeies such as RAM, it is achieved that pipeline work completely, and the dead time of whole digital pulse signal discrimination system is minimum, and real-time performance is high.
Criteria parameter and threshold value thereof in the embodiment of the present invention all freely can be set by user, and motility is big, and different criteria parameter combinations just can be applicable to different workplaces, and the scope of application is very wide.
The above; being only the present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; the change that can readily occur in or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (7)
1. the method that digital pulse signal is carried out examination process, it is characterised in that setting the threshold value of each criteria parameter of digital pulse signal respectively, described method specifically includes:
Obtain multiple criteria parameter of digital pulse signal；Multiple criteria parameter of described digital pulse signal include: pulsewidth, the rise time, fall time, waveform total mark, waveform head integration, waveform afterbody integration, waveform area-of-interest integration in one or more；
When each criteria parameter in the plurality of criteria parameter meets the threshold value of described setting, then judge that described digital pulse signal is effective digital pulse signal；
The described multiple criteria parameter obtaining digital pulse signal include:
Digital pulse signal is input in field programmable gate array, the frequency reducing described digital pulse signal is processed by serioparallel exchange, utilize noise examination to process the noise signal removing in described digitized pulse signal, from described digitized pulse signal, extract effective particle pulse signal；
Process, by numeral peak-seeking, the peak value obtaining described particle pulse signal, and described particle pulse signal is stored in memorizer；
Wherein, numeral peak-seeking processes and includes: maximum value process and derivative method；The process of maximum value process peak-seeking is: after a particle pulse signal arrives, set a peak value depositor and be initialized as 0, if the numerical value of current PRF data stream is more than described peak value register value, then current data is stored in peak value depositor, then new peak value register value and follow-up pulse data fluxion value is used to compare, so when, after a valid data end-of-pulsing, the numerical value in peak value depositor is the peak value of this particle pulse signal；The process of derivative method peak-seeking is: after an effective particle pulse signal arrives, it is the shift register of 3 by the data stream of this particle pulse signal by a degree of depth, 3 data in a shift register, it is designated as D1, D2, D3 successively, after being all assigned significant digits pulse data, it is judged that whether condition D1 < D2 and D3 < D2 sets up；If setting up, then latch the peak value that value is current PRF of D2；Otherwise, wait judges next time.
2. the method that digital pulse signal is carried out examination process according to claim 1, it is characterised in that described method also includes:
Switch the multiple digital pulse signals of storage, each memorizer one digital pulse signal of storage by multiple memorizeies, from the plurality of memorizer, extract digital pulse signal successively carry out examination process；
Or；
Storing multiple digital pulse signal by a toroidal memory, each digital pulse signal extracted successively from described toroidal memory in the plurality of digital pulse signal carries out examination process.
3. the method that digital pulse signal is carried out examination process according to claim 1 and 2, it is characterized in that, the described each criteria parameter worked as in the plurality of criteria parameter meets the threshold value of described setting, then judge that described digital pulse signal is effective digital pulse signal, also include:
The combined threshold value that the combination of two or more criteria parameter is corresponding is set, when the said two of described digital pulse signal or multiple criteria parameter meet described combined threshold value, then judges that described digital pulse signal is effective digital pulse signal.
4. the device that digital pulse signal is carried out examination process, it is characterised in that described device specifically includes:
Threshold value setting module, for setting the threshold value of each criteria parameter of digital pulse signal respectively
Criteria parameter acquisition module, obtains multiple criteria parameter of digital pulse signal to be screened；
Judging treatmenting module, for when threshold value set by each criteria parameter in multiple criteria parameter that described criteria parameter acquisition module is acquired meets described threshold value setting module, then judging that described digital pulse signal is effective digital pulse signal；
Described criteria parameter acquisition module, it is additionally operable to be input in field programmable gate array by digital pulse signal, the frequency reducing described digital pulse signal is processed by serioparallel exchange, utilize noise examination to process the noise signal removing in described digitized pulse signal, from described digitized pulse signal, extract effective particle pulse signal；
Process, by numeral peak-seeking, the peak value obtaining described particle pulse signal, and described particle pulse signal is stored in memorizer；
Wherein, numeral peak-seeking processes and includes: maximum value process and derivative method；The process of maximum value process peak-seeking is: after a particle pulse signal arrives, set a peak value depositor and be initialized as 0, if the numerical value of current PRF data stream is more than described peak value register value, then current data is stored in peak value depositor, then new peak value register value and follow-up pulse data fluxion value is used to compare, so when, after a valid data end-of-pulsing, the numerical value in peak value depositor is the peak value of this particle pulse signal；The process of derivative method peak-seeking is: after an effective particle pulse signal arrives, it is the shift register of 3 by the data stream of this particle pulse signal by a degree of depth, 3 data in a shift register, it is designated as D1, D2, D3 successively, after being all assigned significant digits pulse data, it is judged that whether condition D1 < D2 and D3 < D2 sets up；If setting up, then latch the peak value that value is current PRF of D2；Otherwise, wait judges next time.
5. the device that digital pulse signal is carried out examination process according to claim 4, it is characterised in that described device also includes:
Signal memory module, for switching the multiple digital pulse signals of storage by multiple memorizeies, each memorizer stores a digital pulse signal, or；Multiple digital pulse signal is stored by a toroidal memory.
6. the device that digital pulse signal is carried out examination process according to claim 5, it is characterised in that:
Described criteria parameter acquisition module, is additionally operable to work as described signal memory module and switches the multiple digital pulse signals of storage by multiple memorizeies, extract digital pulse signal successively and carry out examination process from the plurality of memorizer, or；When described signal memory module stores multiple digital pulse signal by a toroidal memory, each digital pulse signal extracted successively from one toroidal memory in the plurality of digital pulse signal carries out examination process.
7. the device that digital pulse signal is carried out examination process according to claim 4 or 5 or 6, it is characterised in that:
Described threshold value setting module, is additionally operable to arrange the combined threshold value of the combination correspondence of two or more criteria parameter；
Described judging treatmenting module, is additionally operable to when the said two of described digital pulse signal or multiple criteria parameter meet described combined threshold value, then judge that described digital pulse signal is effective digital pulse signal.
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| CN104753563B (en) * | 2015-03-05 | 2018-04-03 | 成都大公博创信息技术有限公司 | A kind of pulse signal captures processing unit and method in real time |
| AT517499B1 (en) * | 2015-08-12 | 2018-02-15 | Avl List Gmbh | Method and device for detecting signal pulses |
| CN108023576B (en) * | 2017-12-25 | 2021-02-02 | 北京无线电计量测试研究所 | Method for calibrating rise time of fast edge pulse generator |
| CN111257628B (en) * | 2020-03-05 | 2022-05-06 | 成都飞机工业（集团）有限责任公司 | Anti-interference method for converting alternating current signal into pulse signal |
| CN112649837B (en) * | 2020-11-27 | 2021-09-17 | 松山湖材料实验室 | Particle identification method, electronic readout system and neutron detector |
| CN113109861A (en) * | 2021-04-12 | 2021-07-13 | 中国原子能科学研究院 | Radiation detection device and method thereof |
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