CN106647435B - The multi-channel data method of sampling, system and device - Google Patents

The multi-channel data method of sampling, system and device Download PDF

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CN106647435B
CN106647435B CN201610836871.6A CN201610836871A CN106647435B CN 106647435 B CN106647435 B CN 106647435B CN 201610836871 A CN201610836871 A CN 201610836871A CN 106647435 B CN106647435 B CN 106647435B
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data
memory space
sampling
channel
sample rate
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CN106647435A (en
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赵明剑
黄三伟
李泽婷
陈梓庆
郑子瑶
刘乃新
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South China University of Technology SCUT
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0428—Safety, monitoring
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/26—Pc applications
    • G05B2219/2612—Data acquisition interface

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  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
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Abstract

The present invention relates to a kind of multi-channel data method of sampling, system and device, method comprises the following steps：After corresponding first memory space of present sample passage is filled with, next sampling channel is switched to from present sample passage, and control memory space to switch to corresponding second memory space of next sampling channel；Wherein, present sample passage is is carrying out the passage of sampling operation in each sampling channel, and each sampling channel corresponds to a memory space respectively, and the data of each sampling channel, which are distinguished, is stored in corresponding memory space after interpolation data frame head；After the completion of switching, Fourier transformation is carried out to the data in first memory space, the intensity and frequency information of the power spectrum of data in first memory space is extracted；If the intensity and frequency information of the power spectrum meet default condition, sample rate is set into the first sample rate samples to the data of next sampling channel.

Description

The multi-channel data method of sampling, system and device
Technical field
The present invention relates to digital signal processing technique field, more particularly to a kind of multi-channel data method of sampling, system And device.
Background technology
With the development of electronic information technology, array acquisition and the processing of extensive signal transacting, especially multichannel Correlation technique is also flourished, and the quantity of passage is on the increase, and is gathered and is also constantly increased with the data volume handled.Large scale array Signal acquiring and processing just turns into an emerging research field.
Nowadays CPU (Central Processing Unit, central processing unit), internal memory, GPU (Graphics Processing Unit, graphics processor) etc. the performance of device constantly lifted, follow-up data disposal ability is significantly increased, and is promoted Practical application is also skyrocketed through, thus urgently needed limited to the ampling channel number of front end link, the requirement of sample frequency The more durations of memory space memory storage useful signal, save system resource, control system cost, improve whole system work Make efficiency, application.
Presently used array acquisition technology is often divided into following two kinds of mechanism：One is to use " ADC (Analog a to Digital Converter, analog-digital converter) correspondence passage all the way " mode, it is clear that be not suitable for the feelings of large scale array collection Condition；Two be to use " an ADC correspondence multiplexer channel, switched by the switching of synchronised clock control passage and memory space ".This side Formula needs strictly for ADC sample frequency, the time of various switchings, the specified sequential collaboration for waiting operation of different memory spaces Control, cause the consumption of system resource, resource utilization is low.
The content of the invention
Based on this, it is necessary to for resource utilization it is low the problem of there is provided a kind of multi-channel data method of sampling, system and Device.
A kind of multi-channel data method of sampling, comprises the following steps：
After corresponding first memory space of present sample passage is filled with, next sampling is switched to from present sample passage Passage, and control memory space to switch to corresponding second memory space of next sampling channel；Wherein, present sample passage is The passage of sampling operation is carrying out in each sampling channel, each sampling channel corresponds to a memory space respectively, and each is adopted The data of sample passage, which are distinguished, is stored in corresponding memory space after interpolation data frame head；
After the completion of switching, Fourier transformation is carried out to the data in first memory space, first storage is extracted The intensity and frequency information of the power spectrum of data in space；
If the intensity and frequency information of the power spectrum meet default condition, sample rate is set to the first sample rate Data to next sampling channel are sampled.
A kind of multi-channel data sampling system, including：
Handover module, for after corresponding first memory space of present sample passage is filled with, being cut from present sample passage Next sampling channel is shifted to, and controls memory space to switch to corresponding second memory space of next sampling channel；Wherein, Present sample passage is is carrying out the passage of sampling operation in each sampling channel, each sampling channel corresponds to one respectively and deposited Space is stored up, the data of each sampling channel, which are distinguished, is stored in corresponding memory space after interpolation data frame head；
Data in first memory space after the completion of switching, are carried out Fourier transformation, extracted by judge module The intensity and frequency information of the power spectrum of data in first memory space；
Sampling module, if the intensity and frequency information for the power spectrum meet default condition, sample rate is set The first sample rate is set to sample to the data of next sampling channel.
A kind of multi-channel data sampling apparatus, including：
Switching switch, analog-to-digital conversion module, address selector, memory space, plus frame head circuit, clock generator are counted Device and triggers circuit；
Rear class data processing unit sends fragment to triggers circuit and finishes receiving mark, and triggers circuit receives fragment reception After complement mark, according to the data point reuse sample rate inputted in last time poll from memory space, and by controlling clock generator The sample rate for changing analog-to-digital conversion module is sampled, and sampled data deposits into corresponding memory space and by adding by switching switch Frame head circuit supplements frame originating point information, and counter counts send meter full scale will when full, triggers circuit, switching switch, address selector enter Line asynchronous, which is shaken hands, switches to next sampling channel and corresponding memory space, and triggers circuit passes through next sampling channel last time poll knot Fruit adjustment sample rate, output fragment is filled with mark and arrives rear class data processing unit, and receives the return of rear class data processing unit Fragment finishes receiving mark.
Compared with prior art, the multi-channel data method of sampling, system and device of the invention, each sampling channel correspondence One memory space, during sampling, if the corresponding memory space of present sample passage is filled with, present sample passage is switched to down One passage, and memory space is switched into the corresponding memory space of next passage, and with high frequency after useful signal arrival Rate is sampled, and is sampled when useful signal does not arrive with low frequency, can be expanded sampling channel in the case where not increasing ADC, Sampling duration is expanded in the case of not increasing existing memory space, with efficiency high, stability is strong, and memory space utilization rate is high Feature.
Brief description of the drawings
Fig. 1 is the multi-channel data method of sampling flow chart of one embodiment；
Fig. 2 (a) is the programming flowchart of the multi-channel data method of sampling of one embodiment；
The programming flowchart that Fig. 2 (b) switches for the passage of one embodiment；
Fig. 3 is the structural representation of the multi-channel data sampling system of one embodiment；
Fig. 4 is the structural representation of the multi-channel data sampling apparatus of one embodiment；
Fig. 5 is the structural representation of the triggers circuit of one embodiment；
Fig. 6 is the application schematic diagram of the multi-channel data sampling apparatus of one embodiment.
Embodiment
Technical scheme is illustrated below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention provides a kind of multi-channel data method of sampling, it may include following steps：
S1, after corresponding first memory space of present sample passage is filled with, is switched to next from present sample passage Sampling channel, and control memory space to switch to corresponding second memory space of next sampling channel；Wherein, present sample leads to Road is is carrying out the passage of sampling operation in each sampling channel, each sampling channel corresponds to a memory space respectively, respectively The data of individual sampling channel, which are distinguished, is stored in corresponding memory space after interpolation data frame head；
In this step, sampling channel can include [C1(n)-Ci(n)-CN(n)], the sampling channel [C1(n)-Ci(n)- CN(n)] memory space [M can be corresponded to respectively1(n)-Mi(n)-MN(n)].Wherein, N is total number of channels amount, i=1,2 ..., N.N is wheel Ask number of times.Channel Ci(n)Data correspondence deposit memory space Mi(n), poll is reciprocal successively.Assuming that present sample passage is Ci(n), It can determine whether sampling channel Ci(n)Whether it is filled with.Sampling channel is controlled to switch to next sampling channel C if being filled withi+1(n), when cutting Change to Ci+1(n)Memory space, which is can control, after passage success switches to corresponding memory space Mi+1(n)., can be after if not being filled with Continue with present sample channel Ci(n)Sampling, and return to the step for judging whether corresponding first memory space of present sample passage is filled with Suddenly.
In one embodiment, can be to being stored after sampled data interpolation data frame head, if sampled data is filled with one Individual fragment, DBMS processing unit sends fragment and is filled with mark backward, and the fragment for waiting subsequent data processing unit to return connects Complement mark is received, is being received after the fragment finishes receiving mark, return judges that present sample passage corresponding first is deposited The step of whether storage space is filled with.
Data in first memory space after the completion of switching, are carried out Fourier transformation by S2, are extracted described first and are deposited The intensity and frequency information of the power spectrum of data in storage space；
It can know whether useful signal reaches sampling channel in the intensity and frequency information that are embodied from the power spectrum.
S3, if the intensity and frequency information of the power spectrum meet default condition, sample rate is set into first adopts Sample rate is sampled to the data of next sampling channel.
If the intensity and frequency information of the power spectrum meet default condition, show that useful signal is reached.Now, may be used The data of next sampling channel are sampled so that sample rate is set into the first sample rate.The default condition can Be power spectral intensity be more than preset value, or frequency be in preset range in etc..
If conversely, the intensity and frequency information of the power spectrum do not meet default condition, showing that useful signal is not arrived Reach.The data of next sampling channel are sampled at this point it is possible to which sample rate is set into the second sample rate；Wherein, it is described Second sample rate is less than first sample rate.The inverse (i.e. sampling time interval) of second sample rate is more than useful signal The minimum repetition period.When useful signal is not reached, sampled with low rate, when useful signal arrives, with high-speed Sampled, can be with effectively save system resource.
In one embodiment, sample rate when after system can be started sample for the first time is set to second sampling Rate.
Current memory space Mi(n)It may include data frame head and the data gathered from current channel.Data frame head can be wrapped Containing following information：The corresponding channel number C of current datai(n)；Current channel sample rate Fs used when gathering；Current is relative Time scale dtn；It is polled to the frequency n of the passage.In case being used during data inversion.Currently stored sky is stored in after gathering each time Between Mi(n)Data segment all include the data frame head.When passage switches, without data storage.
As shown in Fig. 2 (a) and Fig. 2 (b), the program flow of multi-channel data sampling of the invention can be real according to following manner It is existing：Corresponding acquisition channel C is distributed firsti(n)With memory space Mi(n), then middle control with handshake module wait from follow-up Unit receives fragment and finishes receiving mark RF, after the mark is received, according to the result of the secondary poll of respective channel/spatially (i.e. default result) sets sample rate Fs, and (being polled as low frequency Fsl for the first time) is then adopted by clock control ADC with corresponding Sample rate, which is sampled and adds frame originating point information, is stored in memory space.Waiting space counting module meter completely after, using asynchronous The mode shaken hands is by current channel Ci(n), memory space Mi(n)Switch to next sampling channel Ci(n+1)Corresponding memory space Mi(n+1).Then according to Mi(n)In data take power spectral information to judge whether useful signal reaches.If judged result be signal Reach, then sample rate Fs is preset as high sampling rate Fsh, is otherwise preset as Fsl.Then output fragment is filled with mark TF to follow-up Unit simultaneously sends out data.Eventually pass back to wait to receive fragment from predecessor cell and finish receiving and indicate RF, continuous poll is reciprocal.
Compared with prior art, the present invention provides a kind of multi-channel sampling method of high reliability, can not increase ADC In the case of expand sampling channel, sampling duration is expanded in the case where not increasing existing memory space, it is stable with efficiency high Property strong, the characteristics of memory space utilization rate is high.
System of the present invention corresponds sampling channel and memory space, and passage switching switches with memory space to be used The mode of asynchronous handshake carries out data storage.Especially, burst type sampling meanses in adaptive set are employed, are deposited as much as possible Useful data is stored up, overhead is also saved.And as a result of the mode of asynchronous handshake, reliability is high.
As shown in figure 3, the present invention provides a kind of multi-channel data sampling system, it may include：
Handover module 11, for after corresponding first memory space of present sample passage is filled with, from present sample passage Next sampling channel is switched to, and controls memory space to switch to corresponding second memory space of next sampling channel；Its In, present sample passage is is carrying out the passage of sampling operation in each sampling channel, each sampling channel corresponds to one respectively Individual memory space, the data of each sampling channel, which are distinguished, is stored in corresponding memory space after interpolation data frame head；
Sampling channel can include [C1(n)-Ci(n)-CN(n)], the sampling channel [C1(n)-Ci(n)-CN(n)] can correspond to respectively Memory space [M1(n)-Mi(n)-MN(n)].Wherein, N is total number of channels amount, i=1,2 ..., N.N is wrap count.Channel Ci(n) Data correspondence deposit memory space Mi(n), poll is reciprocal successively.Assuming that present sample passage is Ci(n), can determine whether sampling channel Ci(n)Whether it is filled with.Sampling channel is controlled to switch to next sampling channel C if being filled withi+1(n), when being switched to Ci+1(n)Passage Memory space is can control after success and switches to corresponding memory space Mi+1(n).If not being filled with, it can continue logical with present sample Road Ci(n)Sampling, and return to the step of whether corresponding first memory space of present sample passage is filled with judged.
In one embodiment, can be to being stored after sampled data interpolation data frame head, if sampled data is filled with one Individual fragment, DBMS processing unit sends fragment and is filled with mark backward, and the fragment for waiting subsequent data processing unit to return connects Complement mark is received, is being received after the fragment finishes receiving mark, return judges that present sample passage corresponding first is deposited The step of whether storage space is filled with.
Data in first memory space after the completion of switching, are carried out Fourier transformation, carried by judge module 12 Take the intensity and frequency information of the power spectrum of data in first memory space；
It can know whether useful signal reaches sampling channel in the intensity and frequency information that are embodied from the power spectrum.
Sampling module 13, if the intensity and frequency information for the power spectrum meet default condition, by sample rate The first sample rate is set to sample to the data of next sampling channel.
If the intensity and frequency information of the power spectrum meet default condition, show that useful signal is reached.Now, may be used The data of next sampling channel are sampled so that sample rate is set into the first sample rate.The default condition can Be power spectral intensity be more than preset value, or frequency be in preset range in etc..
If conversely, the intensity and frequency information of the power spectrum do not meet default condition, showing that useful signal is not arrived Reach.The data of next sampling channel are sampled at this point it is possible to which sample rate is set into the second sample rate；Wherein, it is described Second sample rate is less than first sample rate.The inverse (i.e. sampling time interval) of second sample rate is more than useful signal The minimum repetition period.When useful signal is not reached, sampled with low rate, when useful signal arrives, with high-speed Sampled, can be with effectively save system resource.
In one embodiment, sample rate when after system can be started sample for the first time is set to second sampling Rate.
Current memory space Mi(n)It may include data frame head and the data gathered from current channel.Data frame head can be wrapped Containing following information：The corresponding channel number C of current datai(n)；Current channel sample rate Fs used when gathering；Current is relative Time scale dtn；It is polled to the frequency n of the passage.In case being used during data inversion.Currently stored sky is stored in after gathering each time Between Mi(n)Data segment all include the data frame head.When passage switches, without data storage.
As shown in Fig. 2 (a) and Fig. 2 (b), the program flow of multi-channel data sampling of the invention can be real according to following manner It is existing：Corresponding acquisition channel C is distributed firsti(n)With memory space Mi(n), then middle control with handshake module wait from follow-up Unit receives fragment and finishes receiving mark RF, after the mark is received, according to the result of the secondary poll of respective channel/spatially (i.e. default result) sets sample rate Fs, and (being polled as low frequency Fsl for the first time) is then adopted by clock control ADC with corresponding Sample rate, which is sampled and adds frame originating point information, is stored in memory space.Waiting space counting module meter completely after, using asynchronous The mode shaken hands is by current channel Ci(n), memory space Mi(n)Switch to next sampling channel Ci(n+1)Corresponding memory space Mi(n+1).Then according to Mi(n)In data take power spectral information to judge whether useful signal reaches.If judged result be signal Reach, then sample rate Fs is preset as high sampling rate Fsh, is otherwise preset as Fsl.Then output fragment is filled with mark TF to follow-up Unit simultaneously sends out data.Eventually pass back to wait to receive fragment from predecessor cell and finish receiving and indicate RF, continuous poll is reciprocal.
Compared with prior art, the present invention provides a kind of multi-channel sampling system of high reliability, can not increase ADC In the case of expand sampling channel, sampling duration is expanded in the case where not increasing existing memory space, it is stable with efficiency high Property strong, the characteristics of memory space utilization rate is high.
System of the present invention corresponds sampling channel and memory space, and passage switching switches with memory space to be used The mode of asynchronous handshake carries out data storage.Especially, burst type sampling meanses in adaptive set are employed, are deposited as much as possible Useful data is stored up, overhead is also saved.And as a result of the mode of asynchronous handshake, reliability is high.
As shown in figure 4, the present invention also provides a kind of multi-channel data sampling apparatus, it may include：
Switching switch 21, analog-to-digital conversion module 22, address selector 23, memory space 24, plus frame head circuit 25, clock hair Raw device 26, counter 27 and triggers circuit 28；
Rear class data processing unit sends fragment to triggers circuit 28 and finishes receiving mark, and triggers circuit 28 receives the fragment Finish receiving after mark, according to the data point reuse sample rate inputted in last time poll from memory space 24, and by controlling clock The sample rate that generator 26 changes analog-to-digital conversion module 22 is sampled, and sampled data deposits into corresponding deposit by switching switch 21 Storage space 24 and by adding frame head circuit 25 to supplement frame originating point information, the meter of counter 27 sends meter full scale will when full, triggers circuit 28, cut Change switch 21, the progress of address selector 23 asynchronous handshake and switch to next sampling channel and corresponding memory space 24, triggers circuit 28 adjust sample rate by next sampling channel last time polling result, and output fragment is filled with mark and arrives rear class data processing unit, And receive rear class data processing unit return fragment finish receiving mark.
As shown in figure 5, the triggers circuit 28 may include the first trigger 281, the second trigger 282, the 3rd trigger 283rd, arithmetic unit 284 and state selecting switch 285；The connection of the first trigger 281 switching switch 21 and counter 27, it is described Second trigger 282 connection switching switch 21, address selector 23 and arithmetic unit 284, the arithmetic unit 284 connect memory space 24 and state selecting switch 285, the state selecting switch 285 connects the 3rd trigger 283, clock generator 26 and rear series According to processing unit, the 3rd trigger 283 connects rear class data processing unit.
As shown in fig. 6, it in an application example of the multi-channel data sampling apparatus, figure 102 is of the present invention to be A kind of multi-channel data sampling apparatus.101 be prime simulation process in figure, and 103 be data waveform recovery device in figure.This hair Bright described multi-channel data sampling apparatus 102 carries out asynchronous handshake with data waveform recovery device 103 by TF, RF, finally Shown by 103 on the display of main frame.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (8)

1. a kind of multi-channel data method of sampling, after corresponding first memory space of present sample passage is filled with, is adopted from currently Sample passage switches to next sampling channel, and it is empty to control memory space to switch to corresponding second storage of next sampling channel Between, wherein, present sample passage is is carrying out the passage of sampling operation in each sampling channel, each sampling channel is right respectively Answer a memory space, it is characterised in that comprise the following steps：
The data of each sampling channel, which are distinguished, is stored in corresponding memory space after interpolation data frame head；
After the completion of switching, Fourier transformation is carried out to the data in first memory space, first memory space is extracted The intensity and frequency information of the power spectrum of interior data；
If the intensity and frequency information of the power spectrum meet default condition, sample rate is set to the first sample rate under The data of one sampling channel are sampled.
2. the multi-channel data method of sampling according to claim 1, it is characterised in that further comprising the steps of：
If the intensity and frequency information of the power spectrum do not meet default condition, sample rate is set to the second sample rate under The data of one sampling channel are sampled；Wherein, second sample rate is less than first sample rate.
3. the multi-channel data method of sampling according to claim 1, it is characterised in that switched to from present sample passage Before next sampling channel, in addition to：
Judge whether corresponding first memory space of present sample passage is filled with；
If being filled with, the operation that next sampling channel is switched to from present sample passage is performed；
If not being filled with, present sample passage is kept to continue to sample.
4. the multi-channel data method of sampling according to claim 3, it is characterised in that further comprising the steps of：
To being stored after sampled data interpolation data frame head；
If sampled data is filled with a fragment, DBMS processing unit sends fragment and is filled with mark backward, and waits follow-up data The fragment that processing unit is returned finishes receiving mark；
Receiving after the fragment finishes receiving mark, return judges that corresponding first memory space of present sample passage is It is not no the step of be filled with.
5. the multi-channel data method of sampling according to claim 1, it is characterised in that second sample rate it is reciprocal small In the minimum repetition period of useful signal.
6. the multi-channel data method of sampling according to claim 1, it is characterised in that further comprising the steps of：
Sample rate when after system is started sample for the first time is set to second sample rate.
7. a kind of multi-channel data sampling system, including handover module, for empty in corresponding first storage of present sample passage Between when being filled with, switch to next sampling channel from present sample passage, and it is logical to control memory space to switch to next sampling Corresponding second memory space in road；Wherein, present sample passage is to be carrying out the passage of sampling operation in each sampling channel, Each sampling channel corresponds to a memory space respectively, it is characterised in that the handover module is additionally operable to each sampling channel Corresponding memory space is stored in after data interpolation data frame head respectively, in addition to：
Data in first memory space after the completion of switching, are carried out Fourier transformation by judge module, extract described The intensity and frequency information of the power spectrum of data in first memory space；
Sampling module, if the intensity and frequency information for the power spectrum meet default condition, sample rate is set to First sample rate is sampled to the data of next sampling channel.
8. a kind of multi-channel data sampling apparatus, including switching switch, analog-to-digital conversion module, memory space, clock generator and Triggers circuit, it is characterised in that also include：
Address selector, plus frame head circuit and counter；
Rear class data processing unit sends fragment to triggers circuit and finishes receiving mark, and triggers circuit receives the fragment and finished receiving After mark, according to the data point reuse sample rate inputted in last time poll from memory space, and by controlling clock generator to change The sample rate of analog-to-digital conversion module is sampled, and sampled data deposits into corresponding memory space and by adding frame head by switching switch Circuit supplements frame originating point information, and counter counts send meter full scale will when full, triggers circuit, switching switch, address selector carry out different Step, which is shaken hands, switches to next sampling channel and corresponding memory space, and triggers circuit is adjusted by next sampling channel last time polling result Whole sample rate, output fragment is filled with mark and arrives rear class data processing unit, and receives the fragment of rear class data processing unit return Finish receiving mark.
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