CN112379630A - Method for improving acquisition precision of signal acquisition board card - Google Patents
Method for improving acquisition precision of signal acquisition board card Download PDFInfo
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- CN112379630A CN112379630A CN202011386169.7A CN202011386169A CN112379630A CN 112379630 A CN112379630 A CN 112379630A CN 202011386169 A CN202011386169 A CN 202011386169A CN 112379630 A CN112379630 A CN 112379630A
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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
Abstract
The invention discloses a method for improving acquisition precision of a signal acquisition board card, which comprises the steps of constructing a precision optimization function according to an acquisition value acquired by one channel or gear of an ADC (analog to digital converter); verifying whether the constructed precision optimization function realizes precision optimization, if the precision optimization function passes the verification, determining the number of required functions according to the acquisition conditions, and constructing a plurality of precision optimization functions under different conditions; summarizing and storing a plurality of precision optimization functions; and calling a corresponding precision optimization function according to the input ADC acquisition value for processing, and outputting the acquisition value after precision optimization. According to the invention, under the condition of not adding a hardware noise reduction function, a series of optimization functions are calculated through analysis of different channels, gears and environmental conditions, so that the sampling precision of the acquisition board card can be effectively improved, the board distribution area is saved, the use amount of some devices in hardware design can be reduced, the probability of board card design problems is reduced, and the cost is effectively reduced.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a method for improving acquisition precision of a signal acquisition board card.
Background
In the engineering field, the signal acquisition board card not only needs to realize various acquisition functions, but also needs to ensure the acquisition precision. The signal acquisition circuit of normal design because the influence of power noise, access noise and integrated circuit board self noise often can make the value that the sampling obtained deviate to some extent with the standard value. To achieve better acquisition precision, a following filter device is added to a signal acquisition channel to reduce channel noise, and an LDO power supply is added to reduce power supply noise, so that hardware performance indexes of board card precision are improved, and sampling precision is improved.
When the current acquisition board card has more acquisition function requirements (such as more acquisition gears and more acquisition channels), the number of ADC chips is usually increased to meet the requirements of more acquisition paths and acquisition gears; meanwhile, more filtering and voltage following devices are added to a signal path, so that the noise influence is reduced, and the acquisition precision is improved. However, the method uses a plurality of ADC chips, operational amplifier chips, LDO power supply chips and resistance-capacitance elements, occupies a large PCB layout area, and simultaneously increases the manufacturing cost of the board card; in many cases, due to the limitation of conditions such as standardization and the like, the area of the board card is controlled to be small; or the budget cost is insufficient, and a large number of noise reduction devices cannot be added. Many preset schemes for improving hardware performance cannot be realized due to the limitation of board layout area, and in such a case, a new scheme is required to realize board card performance indexes.
Disclosure of Invention
The invention aims to solve the technical problem that a function calculation optimization value is established to improve the acquisition precision of an acquisition board card under the condition that a hardware noise reduction function is not added, and aims to provide a method for improving the acquisition precision of a signal acquisition board card, reduce the noise of each device of the acquisition board card and improve the acquisition precision.
The invention is realized by the following technical scheme:
because the existing acquisition board card generally increases the number of ADC chips under the condition of more acquisition function requirements (such as more acquisition gears and more acquisition channels) so as to meet the requirements of more acquisition paths and acquisition gears; meanwhile, more filtering and voltage following devices are added to a signal path, so that the noise influence is reduced, and the acquisition precision is improved. However, the method uses a plurality of ADC chips, operational amplifier chips, LDO power supply chips and resistance-capacitance elements, occupies a large PCB layout area, and simultaneously increases the manufacturing cost of the board card; in many cases, due to the limitation of standardization and other conditions, many of the preset solutions for improving the hardware performance cannot achieve the noise reduction function due to the limitation of the board layout area.
Therefore, based on the above problem, the present invention provides a method for improving acquisition accuracy of a signal acquisition board card, wherein a function calculation optimization value is established to improve the acquisition accuracy of the acquisition board card without adding a hardware noise reduction function, and the method specifically includes the following steps:
s1, constructing an accuracy optimization function according to an acquisition value acquired by one channel or gear of the ADC;
s2, verifying whether the constructed precision optimization function realizes precision optimization, if the precision optimization function passes the verification, determining the number of required functions according to the acquisition conditions, and constructing a plurality of precision optimization functions under different conditions;
s3, summarizing and storing the precision optimization functions;
and S4, calling a corresponding precision optimization function according to the input ADC acquisition value for processing, and outputting the acquisition value after precision optimization.
According to the steps, under the condition that a hardware noise reduction function is not added, a function calculation optimization value can be established, and the acquisition precision of the acquisition board card is improved.
Further, the process of constructing the precision optimization function specifically includes the following steps:
s11, collecting value X by using one channel or gear of ADCMiningAnd the actual input value XIntoCalculating to obtain XMiningAnd XIntoFunctional relationship of (a): xInto＝f(XMining) Said function XInto＝f(XMining) As an initial function;
s12, adjusting the initial function according to the memory space of the memory acquisition board card and the calculation speed of the processor;
and S13, sorting the initial functions to obtain corresponding precision optimization functions.
Further, the acquisition conditions in step S2 include acquisition channels of the ADC, an acquisition gear, and an acquisition board operating temperature point.
When the requirement of multiple gears and multiple channels or influence of board card working temperature on the acquired numerical value needs to be considered when constructing the precision optimization function, the corresponding functions need to be respectively solved for each channel, each gear and each temperature point. The functional form of the precision optimization function needs to be optimized according to the processor computation rate.
Further, the storage of the precision optimization functions in step S3 is in a table form, which facilitates the calling of the functions by the processor.
In addition, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements the method described above.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the method for improving the acquisition precision of the signal acquisition board card, disclosed by the invention, a series of optimization functions are calculated by analyzing different channels, gears and environmental conditions under the condition that a hardware noise reduction function is not added, so that the sampling precision of the acquisition board card can be effectively improved, the board distribution area is saved, the use amount of some devices in hardware design can be reduced, the probability of board card design problems is reduced, and the cost is effectively reduced. The method is suitable for the design of the signal acquisition board card with the size regulation or the cost control, and can be used for further improving the sampling precision of the board cards with better precision when the precision of some board cards in a batch of signal acquisition board cards is slightly poor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a flow chart for constructing a precision optimization function;
FIG. 3 is a diagram illustrating the construction of a precision optimization function under a number of different conditions;
FIG. 4 is a schematic diagram of a precision optimization process using the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail so as not to obscure the present invention.
Throughout the specification, reference to "one embodiment," "an embodiment," "one example," or "an example" means: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrases "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "high", "low", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the scope of the present invention.
Example 1
Because the existing acquisition board card generally increases the number of ADC chips under the condition of more acquisition function requirements (such as more acquisition gears and more acquisition channels) so as to meet the requirements of more acquisition paths and acquisition gears; meanwhile, more filtering and voltage following devices are added to a signal path, so that the noise influence is reduced, and the acquisition precision is improved. However, the method uses a plurality of ADC chips, operational amplifier chips, LDO power supply chips and resistance-capacitance elements, occupies a large PCB layout area, and simultaneously increases the manufacturing cost of the board card; in many cases, due to the limitation of standardization and other conditions, many of the preset solutions for improving the hardware performance cannot achieve the noise reduction function due to the limitation of the board layout area.
Therefore, in view of the above problems, the present invention provides a method for improving the acquisition accuracy of a signal acquisition board, as shown in fig. 1, including steps S1 to S4:
s1, constructing an accuracy optimization function according to an acquisition value acquired by one channel or gear of the ADC;
s2, verifying whether the constructed precision optimization function realizes precision optimization, if the precision optimization function passes the verification, determining the number of required functions according to the acquisition conditions, and constructing a plurality of precision optimization functions under different conditions;
s3, summarizing and storing the precision optimization functions;
and S4, calling a corresponding precision optimization function according to the input ADC acquisition value for processing, and outputting the acquisition value after precision optimization.
According to the steps, under the condition that a hardware noise reduction function is not added, a function calculation optimization value can be established, and the acquisition precision of the acquisition board card is improved.
Specifically, when it is necessary to consider that the multi-gear and multi-channel requirements or the board operating temperature has an influence on the acquisition value when constructing the precision optimization function, as shown in fig. 3, it is necessary to separately calculate a corresponding function for each acquisition channel, each acquisition gear, and each acquisition board operating temperature point of the ADC. The function form of the precision optimization function needs to be optimized according to the calculation rate of the processor, and the storage of the precision optimization functions in the step S3 is stored in a table form, so that the function calling of the processor is facilitated.
As shown in fig. 2, the process of constructing the precision optimization function specifically includes the following steps:
s11, collecting value X by using one channel or gear of ADCMiningAnd the actual input value XIntoCalculating to obtain XMiningAnd XIntoFunctional relationship of (a): xInto＝f(XMining) Said function XInto＝f(XMining) As an initial function;
s12, adjusting the initial function according to the memory space of the memory acquisition board card and the calculation speed of the processor;
and S13, sorting the initial functions to obtain corresponding precision optimization functions.
Example 2
The present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed, implements the method described in embodiment 1. When the method of the invention is actually operated in computer software, as shown in fig. 4, the acquisition value X acquired by the acquisition board cardMiningInput into computer software, computer processor according to input XMiningSearching the precision optimization processing function under the corresponding condition in the stored precision optimization function table, and calling the function to the XMiningThe sampling value after optimized processing is obtained by processing, and the acquisition precision of the acquisition card is improved.
Those of skill would further appreciate that the various illustrative modules and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It can be understood that by the method of the present invention, under the condition of not adding a hardware noise reduction function, a series of optimization functions are calculated by analyzing different channels, gears and environmental conditions, so that the sampling precision of the acquisition board card can be effectively improved, the board distribution area can be saved, the usage amount of some devices in the hardware design can be reduced, the probability of the occurrence of the board card design problem can be reduced, and the cost can be effectively reduced. The method is suitable for the design of the signal acquisition board card with the size regulation or the cost control, and can be used for further improving the sampling precision of the board cards with better precision when the precision of some board cards in a batch of signal acquisition board cards is slightly poor.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A method for improving acquisition precision of a signal acquisition board card is characterized by comprising the following steps:
s1, constructing an accuracy optimization function according to an acquisition value acquired by one channel or gear of the ADC;
s2, verifying whether the constructed precision optimization function realizes precision optimization, if the precision optimization function passes the verification, determining the number of required functions according to the acquisition conditions, and constructing a plurality of precision optimization functions under different conditions;
s3, summarizing and storing the precision optimization functions;
and S4, calling a corresponding precision optimization function according to the input ADC acquisition value to process, and obtaining the acquisition value after precision optimization.
2. The method for improving the acquisition precision of the signal acquisition board card according to claim 1, wherein the process of constructing the precision optimization function specifically includes the following steps:
s11, collecting value X by using one channel or gear of ADCMiningAnd the actual input value XIntoCalculating to obtain XMiningAnd XIntoFunctional relationship of (a): xInto＝f(XMining) Said function XInto＝f(XMining) As an initial function;
s12, adjusting the initial function according to the memory space of the memory acquisition board card and the calculation speed of the processor;
and S13, sorting the initial functions to obtain corresponding precision optimization functions.
3. The method for improving the acquisition accuracy of the signal acquisition board card according to claim 1, wherein the acquisition conditions in the step S2 include acquisition channels, acquisition gears and acquisition board card operating temperature points of the ADC.
4. The method of claim 1, wherein the storing of the accuracy optimization functions for the step S3 is in a form of a table.
5. A computer-readable storage medium, on which a computer program is stored which, when executed, implements the method of any of claims 1-4.
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Citations (5)
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| US20040179587A1 (en) * | 2003-03-11 | 2004-09-16 | Andrew Corporation | Signal sample acquisition techniques |
| CN101718562A (en) * | 2009-11-20 | 2010-06-02 | 电子科技大学 | Method for real-time correcting error of multi-channel high-speed parallel alternative acquisition system |
| CN103475369A (en) * | 2013-07-04 | 2013-12-25 | 东南大学 | High-precision ADC test method based on signal-source-error one-time correction and identification |
| CN107453755A (en) * | 2017-07-11 | 2017-12-08 | 电子科技大学 | A kind of high-speed, high precision multi-channel parallel acquisition system based on mixed architecture |
| CN110190851A (en) * | 2019-05-31 | 2019-08-30 | 湖南恩智测控技术有限公司 | Dynamic adjusts the method, apparatus and storage medium of the DAC output of low precision |
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2020
- 2020-12-01 CN CN202011386169.7A patent/CN112379630A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040179587A1 (en) * | 2003-03-11 | 2004-09-16 | Andrew Corporation | Signal sample acquisition techniques |
| CN101718562A (en) * | 2009-11-20 | 2010-06-02 | 电子科技大学 | Method for real-time correcting error of multi-channel high-speed parallel alternative acquisition system |
| CN103475369A (en) * | 2013-07-04 | 2013-12-25 | 东南大学 | High-precision ADC test method based on signal-source-error one-time correction and identification |
| CN107453755A (en) * | 2017-07-11 | 2017-12-08 | 电子科技大学 | A kind of high-speed, high precision multi-channel parallel acquisition system based on mixed architecture |
| CN110190851A (en) * | 2019-05-31 | 2019-08-30 | 湖南恩智测控技术有限公司 | Dynamic adjusts the method, apparatus and storage medium of the DAC output of low precision |
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