CN109409439A - A kind of real-time kernel implementation method and control system based on Linux - Google Patents
A kind of real-time kernel implementation method and control system based on Linux Download PDFInfo
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Abstract
The invention belongs to field of software development, disclose a kind of real-time kernel implementation method and control system based on Linux, set-up of control system has Linux, Linux is provided with external input module, respond module, storage module, and Linux expansion has system clock mechanism module, waiting mechanism module, periodical algoritic module.The invention is provided with system clock mechanism module, improves to the precision of clock, greatly improves the real-time of system；The invention is provided with interrupt mechanism module, is improved to original interrupt mechanism, so that the response of system is rapider；This is provided with Linux using novel, carries out real-time type operation on the basis Linux, so that portable good, functional is highly reliable.The features such as invention improves clock accuracy, increases real-time, has transplantability good, functional, highly reliable.
Description
Technical field
The invention belongs to field of software development more particularly to a kind of real-time kernel implementation methods and control based on Linux
System.
Background technique
Traditional embedded system such as PSOS, VxWorks, LynxCS etc. are that open source code, price do not compare
Valuableness, and also royalties are paid by quantity when producing product, this makes the cost of the exploitation of embedded system significantly
It improves, and the modification of system kernel can not be completed voluntarily, rely only on the exploitation producer of these systems, so they
Using restricted very big.And the appearance of linux system is popular in it rapidly in embedded development, and it is based on linux kernel
Android system be even more occupy can only cell phone system leading position.The source code of Linux is wide-open, kernel tool
Have a very strong high efficiency, robustness is supportive to the height of network communication, system function it is rich etc., become now embedding
Enter the most widely used operating system of formula development field.Linux is the software increased income completely, kernel code be according to
What POSIX standard was write, support kinds of platform framework, portable very good, perfect in shape and function is highly reliable, but blemish in an otherwise perfect thing
Be it be not very perfect to the support of real-time.
In conclusion problem of the existing technology is:
PSOS, VxWorks, LynxCS etc. are not open source codes, and price is more expensive, and Linux is to real-time
Support be not very perfect.
In the prior art, solve multi-objective optimization question in terms of it is feasible it is poor, validity is poor.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of, and the real-time kernel based on Linux realizes control system
System.
The invention is realized in this way a kind of real-time kernel implementation method based on Linux, the reality based on Linux
When core implementation method include:
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
Investigate the quality of character subset using two evaluation indexes of the degree of correlation and redundancy, in addition, using between sample away from
From the building degree of correlation and redundancy as target fitness function, unsupervised completion is special in noncooperative ECM environment
Levy the selection of subset；
The degree of correlation and redundancy, which are constructed, as target fitness function includes:
Using the objective function of the degree of correlation and one group of minimum of concept definition of redundancy, to evaluate Radar emitter letter
The quality of number character subset；Wherein the reservation of degree of correlation tendency is all is associated with close feature with data structure, and redundancy then can
The feature for excluding and having selected the feature degree of correlation high；Both as the fitness function of film particles group's algorithm；
Degree of correlation target uses entropy Measure Indexes, is defined as follows:
Wherein, N is the number of radar signal data sample；A is weight coefficient, DijIt is sample i and sample j represented by the x
Character subset under Euclidean distance；DaIndicate the average value of all samples Euclidean distance under the total space.SijValue it is necessary
Normalize to [0,1]；When the character subset of selection is reasonable, if sample i and sample j belong to similar, SijValue very little, instead
It is bigger；To f1(x) minimum value is chosen；
Minor cycle operation is optimized by periodical algoritic module；Non-dominated ranking is calculated, external archive is updated, sentences
Whether disconnected external archive character quantity exceeds limitation, if beyond limiting, again in the period all characters crowding distance；From gathering around
It squeezes and starts to delete one by one apart from the smallest point, until character quantity is equal with default value in external cycles, time complexity O
(D×2R×log(2R))；
Iteration, judges whether current state meets the condition of end loop；If conditions are not met, then continuing to execute in next step
Suddenly；If it is satisfied, executing all character steps in output external cycles.
It calls splitting rule to create underlying membrane, after completing preparation, starts division in the film of surface layer and generate M underlying membrane；
It is equal with the forward position the Pareto point quantity of external archive to divide underlying membrane quantity M；Then by the forward position the Pareto point of these archives
Optimum individual as population in the underlying membrane；Finally, remaining each individual to be put into the Pareto forward position nearest apart from itself
Where point in underlying membrane, time complexity is O (N × R).
Further, redundancy target then utilizes related coefficient, when related coefficient absolute value is smaller, what character subset was included
Redundancy is smaller；Objective function is defined as follows:
Wherein, nxIndicate the number of radar signal character subset；D is total Characteristic Number；xjAnd xkRespectively indicate jth in x
A and k-th of element value；bijIndicate value of i-th of sample in j-th of feature, bajIndicate all samples at j-th
Mean value in feature.Therefore, when character subset scale determines, the corresponding objective function f of the small character subset of redundancy2(x)
It is smaller.
Further, the calculation formula of the crowding distance is as shown in formula；
In formula, n indicates the number of objective function, diIndicate the crowding distance in population of i-th of character object,
Indicate the maximum value that m-th of objective function obtains in population,Indicate the minimum value that m-th of objective function obtains in population,WithIt is m-th target function value of i-th of character object in the dimension two sides m closest to point, wherein
Further, surface layer film this use cellular type membranous system, the structure composition expression formula of cellular type membranous system is as follows:
Π=(V, T, C, μ, ω1,…,ωm,(R1,ρ1) ..., (Rm,ρm)) (4)；
Wherein, V is alphabet, and included element is character object.It is to intracellular metabolic element, substance
It is abstract；
For output alphabet；
For catalyst, these elements do not change during Cellular evolution, also do not generate new character；
But must have its participation in certain evolutionary rules could execute, and will be unable to be performed if there is no rule；
μ is the membrane structure comprising m film, and each film and its region enclosed are indicated with label set H, H={ 1,2 ..., m },
Wherein m is known as the degree of the membranous system；
ωi∈V*(1≤i≤m) indicates the multiset containing object inside the region i in membrane structure μ, V*It is character group in V
At any character object set；
Ri(1≤i≤m) is the finite aggregate of evolutionary rule, each RiIt is, ρ associated with the region i in membrane structure ui
It is RiIn partial ordering relation, referred to as dominance relation indicates rule RiThe dominance relation of execution.RiEvolutionary rule be binary group (u,
V), it is generally written into u → v,Character, which may belong to V, in v can also be not belonging to V, but produce not after certain rule executes
When belonging to the character object of V, executes the rule caudacoria and be just dissolved.The number of character object contained by length, that is, u of u is known as advising
The then radius of u → v；
Entire membranous system is in given environment；System is formed by 5 or more the films that are mutually related by hierarchical combination；It is outermost
The film of layer is referred to as surface layer film (Skin membrane), and the film for not including other membrane structures is called underlying membrane (Elementary
membrane)；The part that each film is surrounded is referred to as region (Regions).
Further, the real-time kernel implementation method based on Linux specifically includes:
Based on Linux, there is external input module, respond module, storage module, document management module to constitute
Arithmetic system；
It is inputted by external input module, respond module is for exporting；
File management and storage are carried out by storage module and document management module；
Clock, which is set time, by system clock mechanism module carries out data processing；
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
Minor cycle operation is optimized by periodical algoritic module.
Another object of the present invention is to provide a kind of calculating of the real-time kernel implementation method described in realize based on Linux
Machine program.
Another object of the present invention is to provide a kind of information of the real-time kernel implementation method described in realize based on Linux
Data processing terminal.
Another object of the present invention is to provide a kind of computer readable storage mediums, including instruction, when it is in computer
When upper operation, so that computer executes the real-time kernel implementation method based on Linux.
Another object of the present invention is to provide a kind of, and the real-time kernel based on Linux realizes control system, is provided with
Linux,
The Linux is provided with external input module, respond module, storage module, and Linux expansion has system clock mechanism
Module, waiting mechanism module, periodical algoritic module；
The waiting mechanism module is connected to interrupt mechanism module with system clock mechanism module.
The interrupt mechanism module connection is on linux；
The storage module expansion has document management module.
Another object of the present invention is to provide a kind of insertions of the real-time kernel implementation method described in implementation based on Linux
Formula network communication platform.
Advantages of the present invention and good effect are as follows:
The invention is provided with system clock mechanism module, improves to the precision of clock, greatly improves system
Real-time；The invention is provided with interrupt mechanism module, is improved to original interrupt mechanism, so that the response of system is more
Rapidly；This is provided with Linux using invention, carries out real-time type operation on the basis Linux, so that portable good, functional,
It is highly reliable.
The invention improves clock accuracy, increases real-time, has transplantability good, functional, highly reliable to wait spies
Point.Improve the uniformity and concurrency understood.
The design of present invention application new algorithm carries out emulation experiment, and is compared with MOPSO, SPEA2, PESA2 algorithm, point
Analyse the performances such as accuracy, convergence rate, the distribution of results uniformity coefficient of new algorithm.
New algorithm has fast convergence rate, being capable of the preferable forward position approaching to reality Pareto.Therefore, it can prove newly to calculate
Method is feasible, effective in terms of solving multi-objective optimization question.
Target signature of the present invention selects extracted important feature subset to show good gather in SNR=4dB or more
Class can obviously divide between signal, sharpness of border no overlap, can simplify the design of sorter, improve sorting discrimination, favorably
In engineer application.Independent repeatedly test is carried out, the average cluster accuracy that MPSO, NSGAII and SPEA2 algorithm obtain is respectively
98%, 85%, 80%.Illustrate the sorting discrimination with higher of proposed algorithm.
Detailed description of the invention
Fig. 1 is that the real-time kernel provided in an embodiment of the present invention based on Linux realizes control system schematic diagram.
In figure: 1, external input module；2, system clock mechanism module；3, waiting mechanism module；4, interrupt mechanism module；
5,Linux；6, respond module；7, periodical algoritic module；8, storage module；9, document management module.
Fig. 2 is the real-time kernel implementation method schematic diagram provided in an embodiment of the present invention based on Linux.
Specific embodiment
For the invention, features and effects that can further appreciate that this practical invention, the following examples are hereby given, and cooperates
Detailed description are as follows for attached drawing 1.
Structure of the invention is explained in detail with reference to the accompanying drawing.
As shown in Figure 1, the real-time kernel provided in an embodiment of the present invention based on Linux realizes control system, including outside
Input module 1, system clock mechanism module 2, waiting mechanism module 3, interrupt mechanism module 4, Linux5, respond module 6, period
Property algoritic module 7, storage module 8, document management module 9.
Linux5 is provided with external input module 1, respond module 6, storage module 8, and Linux5 expansion has system clock machine
Molding block 2, waiting mechanism module 3, periodical algoritic module 7.
Waiting mechanism module 3 is connected to interrupt mechanism module 4 with system clock mechanism module 2.
Interrupt mechanism module 4 is connected on Linux5.
The expansion of storage module 8 has document management module 9.
The working principle of the invention: based on the invention passes through Linux5, there is external input module 1, respond module
6, storage module 8, document management module 9 constitute complete operation system, are inputted with external input module 1, respond module
6 for exporting, and storage module 8 and document management module 9 carry out file management and storage.System clock mechanism module 2 carries out pair
The accuracy of clock improves, and waiting mechanism module 3 optimizes task processing with interrupt mechanism module 4, periodical algorithm mould
Block 7 optimizes minor cycle operation.
Such as Fig. 2, the real-time kernel implementation method principle provided in an embodiment of the present invention based on Linux.
Real-time kernel implementation method provided in an embodiment of the present invention based on Linux specifically includes:
Based on Linux, there is external input module, respond module, storage module, document management module to constitute
Arithmetic system；
It is inputted by external input module, respond module is for exporting；
File management and storage are carried out by storage module and document management module；
Clock, which is set time, by system clock mechanism module carries out data processing；
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
Minor cycle operation is optimized by periodical algoritic module.
Application of the invention is further described below with reference to concrete analysis.
Real-time kernel implementation method provided in an embodiment of the present invention based on Linux, the real-time kernel based on Linux
Implementation method includes:
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
Investigate the quality of character subset using two evaluation indexes of the degree of correlation and redundancy, in addition, using between sample away from
From the building degree of correlation and redundancy as target fitness function, unsupervised completion is special in noncooperative ECM environment
Levy the selection of subset；
The degree of correlation and redundancy, which are constructed, as target fitness function includes:
Using the objective function of the degree of correlation and one group of minimum of concept definition of redundancy, to evaluate Radar emitter letter
The quality of number character subset；Wherein the reservation of degree of correlation tendency is all is associated with close feature with data structure, and redundancy then can
The feature for excluding and having selected the feature degree of correlation high；Both as the fitness function of film particles group's algorithm；
Degree of correlation target uses entropy Measure Indexes, is defined as follows:
Wherein, N is the number of radar signal data sample；A is weight coefficient, DijIt is sample i and sample j represented by the x
Character subset under Euclidean distance；DaIndicate the average value of all samples Euclidean distance under the total space.SijValue it is necessary
Normalize to [0,1]；When the character subset of selection is reasonable, if sample i and sample j belong to similar, SijValue very little, instead
It is bigger；To f1(x) minimum value is chosen；
Minor cycle operation is optimized by periodical algoritic module；Non-dominated ranking is calculated, external archive is updated, sentences
Whether disconnected external archive character quantity exceeds limitation, if beyond limiting, again in the period all characters crowding distance；From gathering around
It squeezes and starts to delete one by one apart from the smallest point, until character quantity is equal with default value in external cycles, time complexity O
(D×2R×log(2R))；
Iteration, judges whether current state meets the condition of end loop；If conditions are not met, then continuing to execute in next step
Suddenly；If it is satisfied, executing all character steps in output external cycles.
It calls splitting rule to create underlying membrane, after completing preparation, starts division in the film of surface layer and generate M underlying membrane；
It is equal with the forward position the Pareto point quantity of external archive to divide underlying membrane quantity M；Then by the forward position the Pareto point of these archives
Optimum individual as population in the underlying membrane；Finally, remaining each individual to be put into the Pareto forward position nearest apart from itself
Where point in underlying membrane, time complexity is O (N × R).
Redundancy target then utilizes related coefficient, and when related coefficient absolute value is smaller, the redundancy that character subset is included is got over
It is small；Objective function is defined as follows:
Wherein, nxIndicate the number of radar signal character subset；D is total Characteristic Number；xjAnd xkRespectively indicate jth in x
A and k-th of element value；bijIndicate value of i-th of sample in j-th of feature, bajIndicate all samples at j-th
Mean value in feature.Therefore, when character subset scale determines, the corresponding objective function f of the small character subset of redundancy2(x)
It is smaller.
The calculation formula of the crowding distance is as shown in formula；
In formula, n indicates the number of objective function, diIndicate the crowding distance in population of i-th of character object,
Indicate the maximum value that m-th of objective function obtains in population,Indicate the minimum value that m-th of objective function obtains in population,WithIt is m-th target function value of i-th of character object in the dimension two sides m closest to point, wherein
This uses cellular type membranous system to surface layer film, and the structure composition expression formula of cellular type membranous system is as follows:
Π=(V, T, C, μ, ω1,…,ωm,(R1,ρ1) ..., (Rm,ρm)) (4)；
Wherein, V is alphabet, and included element is character object.It is to intracellular metabolic element, substance
It is abstract；
For output alphabet；
For catalyst, these elements do not change during Cellular evolution, also do not generate new character；
But must have its participation in certain evolutionary rules could execute, and will be unable to be performed if there is no rule；
μ is the membrane structure comprising m film, and each film and its region enclosed are indicated with label set H, H={ 1,2 ..., m },
Wherein m is known as the degree of the membranous system；
ωi∈V*(1≤i≤m) indicates the multiset containing object inside the region i in membrane structure μ, V*It is character group in V
At any character object set；
Ri(1≤i≤m) is the finite aggregate of evolutionary rule, each RiIt is, ρ associated with the region i in membrane structure ui
It is RiIn partial ordering relation, referred to as dominance relation indicates rule RiThe dominance relation of execution.RiEvolutionary rule be binary group (u,
V), it is generally written into u → v,Character, which may belong to V, in v can also be not belonging to V, but produce not after certain rule executes
When belonging to the character object of V, executes the rule caudacoria and be just dissolved.The number of character object contained by length, that is, u of u is known as advising
The then radius of u → v；
Entire membranous system is in given environment；System is formed by 5 or more the films that are mutually related by hierarchical combination；It is outermost
The film of layer is referred to as surface layer film (Skin membrane), and the film for not including other membrane structures is called underlying membrane (Elementary
membrane)；The part that each film is surrounded is referred to as region (Regions).
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When using entirely or partly realizing in the form of a computer program product, the computer program product include one or
Multiple computer instructions.When loading on computers or executing the computer program instructions, entirely or partly generate according to
Process described in the embodiment of the present invention or function.The computer can be general purpose computer, special purpose computer, computer network
Network or other programmable devices.The computer instruction may be stored in a computer readable storage medium, or from one
Computer readable storage medium is transmitted to another computer readable storage medium, for example, the computer instruction can be from one
A web-site, computer, server or data center pass through wired (such as coaxial cable, optical fiber, Digital Subscriber Line (DSL)
Or wireless (such as infrared, wireless, microwave etc.) mode is carried out to another web-site, computer, server or data center
Transmission).The computer-readable storage medium can be any usable medium or include one that computer can access
The data storage devices such as a or multiple usable mediums integrated server, data center.The usable medium can be magnetic Jie
Matter, (for example, floppy disk, hard disk, tape), optical medium (for example, DVD) or semiconductor medium (such as solid state hard disk Solid
State Disk (SSD)) etc..
The above is only the preferred embodiment to this practical invention, is not made in any form to this practical invention
Limitation, all technical spirit any simple modifications made to the above embodiment according to this practical invention, equivalent variations with
Modification, belongs in the range of this practical inventive technique scheme.
Claims (10)
1. a kind of real-time kernel implementation method based on Linux, which is characterized in that the real-time kernel based on Linux is realized
Method includes:
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
The quality of character subset is investigated using two evaluation indexes of the degree of correlation and redundancy, in addition, using between sample apart from structure
The degree of correlation and redundancy are built as target fitness function, unsupervised completion feature is sub in noncooperative ECM environment
The selection of collection；
The degree of correlation and redundancy, which are constructed, as target fitness function includes:
Using the objective function of the degree of correlation and one group of minimum of concept definition of redundancy, to evaluate radar emitter signal spy
Levy the quality of subset；Wherein the reservation of degree of correlation tendency is all is associated with close feature with data structure, and redundancy can then exclude
With the feature for having selected the feature degree of correlation high；Both as the fitness function of film particles group's algorithm；
Degree of correlation target uses entropy Measure Indexes, is defined as follows:
Wherein, N is the number of radar signal data sample；A is weight coefficient, DijIt is the spy of sample i and sample j represented by x
Levy the Euclidean distance under subset；DaIndicate the average value of all samples Euclidean distance under the total space.SijValue must normalizing
Change to [0,1]；When the character subset of selection is reasonable, if sample i and sample j belong to similar, SijValue very little, otherwise more
Greatly；To f1(x) minimum value is chosen；
Minor cycle operation is optimized by periodical algoritic module；Non-dominated ranking is calculated, external archive is updated, judgement is outer
Whether portion's archives character quantity exceeds limitation, if beyond limitation, again in the period all characters crowding distance；From it is crowded away from
From it is the smallest point start delete one by one, until external cycles in character quantity it is equal with default value, time complexity for O (D ×
2R×log(2R))；
Iteration, judges whether current state meets the condition of end loop；If conditions are not met, then continuing to execute next step；Such as
Fruit meets, and executes all character steps in output external cycles.
It calls splitting rule to create underlying membrane, after completing preparation, starts division in the film of surface layer and generate M underlying membrane；Division
Underlying membrane quantity M is equal with the forward position the Pareto point quantity of external archive；Then using these achieve the forward position Pareto point as
The optimum individual of population in the underlying membrane；Finally, remaining each individual to be put into the Pareto forward position point institute nearest apart from itself
In underlying membrane, time complexity is O (N × R).
2. the real-time kernel implementation method based on Linux as described in claim 1, which is characterized in that
Redundancy target then utilizes related coefficient, and when related coefficient absolute value is smaller, the redundancy that character subset is included is smaller；Mesh
Scalar functions are defined as follows:
Wherein, nxIndicate the number of radar signal character subset；D is total Characteristic Number；xjAnd xkRespectively indicate j-th of He in x
The value of k-th of element；bijIndicate value of i-th of sample in j-th of feature, bajIndicate all samples in j-th of feature
On mean value.Therefore, when character subset scale determines, the corresponding objective function f of the small character subset of redundancy2(x) smaller.
3. the real-time kernel implementation method based on Linux as described in claim 1, which is characterized in that
The calculation formula of the crowding distance is as shown in formula；
In formula, n indicates the number of objective function, diIndicate the crowding distance in population of i-th of character object,It indicates
The maximum value that m-th of objective function obtains in population,Indicate the minimum value that m-th of objective function obtains in population,WithIt is m-th target function value of i-th of character object in the dimension two sides m closest to point, wherein
4. the real-time kernel implementation method based on Linux as described in claim 1, which is characterized in that
This uses cellular type membranous system to surface layer film, and the structure composition expression formula of cellular type membranous system is as follows:
Π=(V, T, C, μ, ω1,…,ωm,(R1,ρ1) ..., (Rm,ρm)) (4)；
Wherein, V is alphabet, and included element is character object.It is the pumping to intracellular metabolic element, substance
As；
For output alphabet；
For catalyst, these elements do not change during Cellular evolution, also do not generate new character；But
Must have its participation in certain evolutionary rules could execute, and will be unable to be performed if there is no rule；
μ is the membrane structure comprising m film, and each film and its region enclosed are indicated with label set H, H={ 1,2 ..., m }, wherein
M is known as the degree of the membranous system；
ωi∈V*(1≤i≤m) indicates the multiset containing object inside the region i in membrane structure μ, V*It is that character forms in V
The set of any character object；
Ri(1≤i≤m) is the finite aggregate of evolutionary rule, each RiIt is, ρ associated with the region i in membrane structure uiIt is RiIn
Partial ordering relation, referred to as dominance relation indicates rule RiThe dominance relation of execution.RiEvolutionary rule be binary group (u, v), lead to
Often write as u → v,Character, which may belong to V, in v can also be not belonging to V, but produces after certain rule executes and be not belonging to V
Character object when, execute the rule caudacoria just be dissolved.The number of character object contained by length, that is, u of u referred to as rule u →
The radius of v；
Entire membranous system is in given environment；System is formed by 5 or more the films that are mutually related by hierarchical combination；It is outermost
Film is referred to as surface layer film (Skin membrane), and the film for not including other membrane structures is called underlying membrane (Elementary
membrane)；The part that each film is surrounded is referred to as region (Regions).
5. the real-time kernel implementation method based on Linux as described in claim 1, which is characterized in that described based on Linux's
Real-time kernel implementation method specifically includes:
Based on Linux, there is external input module, respond module, storage module, document management module to constitute operation
System；
It is inputted by external input module, respond module is for exporting；
File management and storage are carried out by storage module and document management module；
Clock, which is set time, by system clock mechanism module carries out data processing；
Task processing is optimized with interrupt mechanism module by waiting mechanism module；
Minor cycle operation is optimized by periodical algoritic module.
6. a kind of computer journey for realizing the real-time kernel implementation method described in Claims 1 to 5 any one based on Linux
Sequence.
7. at a kind of information data for realizing the real-time kernel implementation method described in Claims 1 to 5 any one based on Linux
Manage terminal.
8. a kind of computer readable storage medium, including instruction, when run on a computer, so that computer is executed as weighed
Benefit requires the real-time kernel implementation method described in 1-5 any one based on Linux.
9. a kind of real-time kernel based on Linux realizes control system, which is characterized in that the real-time kernel based on Linux
Realize that set-up of control system has:
Linux,
The Linux is provided with external input module, respond module, storage module, and Linux expansion has system clock mechanism mould
Block, waiting mechanism module, periodical algoritic module；
The waiting mechanism module is connected to interrupt mechanism module with system clock mechanism module.
The interrupt mechanism module connection is on linux；
The storage module expansion has document management module.
10. a kind of built-in network communications platform for implementing the real-time kernel implementation method based on Linux described in claim 1.
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Application publication date: 20190301 |