CN106027308B - A kind of spaceborne 1553B bus communication optimization method - Google Patents
A kind of spaceborne 1553B bus communication optimization method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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Abstract
The present invention provides a kind of spaceborne 1553B bus communication optimization methods, the main task of optimization process is to complete the division of communication minor cycle, the transmission sequence of rationalization's message, the bus table of optimization is generated to reduce bus load, the two indexs of average delay time of communication system, improves the performance of communication system.Bus control unit is transmitted with the bus table optimized for foundation organizing messages.The working efficiency for making communication system is reached ideal state by optimized bus line command table, i.e. bus load and average delay time is optimal.The present invention can not only reduce the delay time of total Thread Message transmission, improve bus bandwidth utilization rate, and the scalability of command table can be improved.
Description
Technical field
The present invention relates to a kind of communication optimization algorithms, belong to bus transfer technology field.
Background technique
1553B bus be in order to adapt to industry and military necessity and propose, application time longest and have it is very high
Reliability and flexibility, Technical comparing is mature in addition, so 1553B bus has been widely used in military, industry and science and technology neck
Domain.As system synthesization degree is higher and higher, data transmission capabilities are substantially improved, how according to the requirement of system ICD file,
The various message in 1553B bus are reasonably dispatched, meets requirement of the system to message transmission real-time and reliability, excavates
The potentiality of 1553B system application model level are the hot spots of current research.
Satellite 1553B bus carry device category is various, situation is complicated, improves the requirement to 1553B bus line command.It wants
1553B bus line command is asked reasonably to be arranged, with the requirement for meeting requirement to Message Time Delay, meeting bus load.1553B life
The arrangement of order includes cycle command, mode order and aperiodic order, and wherein cycle command is set in advance according to mission requirements
, mode order is oneself setting as needed, and aperiodic order is then the order that incident generates.The arrangement of these orders
It can be realized by 1553B order optimization algorithm.
There are some optimization algorithms in current research, wherein it is more commonly used be according to command word and data word respectively into
Row optimization.But 1553B order has inseparability, has the message of data word centainly to have command word, there is no do not order
Enable the message of word.So optimizing according to command word and should be consistent according to the result that data word optimizes.
Summary of the invention
In order to overcome the deficiencies of the prior art, the present invention provides a kind of spaceborne 1553B bus communication optimization algorithm, can satisfy
Requirement of the application system to cycle command and event command function and time delay characteristic.
The technical solution adopted by the present invention to solve the technical problems the following steps are included:
Step 1: algorithm makes the load balancing in bus by changing the transmission location for the first time of order；Determine bus message
The maximum cycle of transmission, the transmission cycle as command timing table；It is the minimum period for determining bus message transmission, big as dividing
One parameter in period；Within the time for transmitting a maximum cycle message, a maximum cycle is divided into several minimums
Period；
Step 2: determining the number m of contained communication frame in 1 second；According to the number of communication frame, determine that the time of communication frame is long
Degree is t=1/m；Minimum period TminThe interior time includes n communication frame, wherein n=Tmin/t；
Step 3: determining byte number N contained by message, setting message can be divided into M message blocks；If N/32 be it is whole,
Then take M=N/32；If N/32 has remainder, M=[N/32]+1 is taken；
Step 4: all message in messaging list are arranged from small to large according to message maximum delay time；Maximum is prolonged
Identical message of slow time arranges from small to large according to transmission data word length；Maximum delay time and message transmission data word
Length message all the same is arranged according to its serial number in messaging list, forms initial bus line command time-scale；
Step 5: first message blocks of message to be arranged into the i-th frame to, any a piece of news according to order
Type, if it is number access service is set, then the initial position of next message blocks takes in i`=(i+1) %n, wherein % representative
Remaining, n represents communication frame number contained in the minimum period；It is serviced if not number access is set, then the start bit of next data block
It is set to i`=(i+1) % (n-2), % represents remainder, and n represents communication frame number contained in the minimum period；It is arranged successively, will own
Message be all arranged in bus list；
Step 6: calculating the summation Q for the message blocks transmitted in a maximum cycle, it is averaged avr, obtains ideal shape
The order number avr to be transmitted in each minimum period under state；
Step 7: finding the minimum period j that first command number is less than avr；
It takes out Step 8: last order will be arranged in first minimum period and deletes the order in this minimum
The order is placed in j-th of minimum period by the transmission location in period, is passed using current transmission as the first time of the order
It is defeated；
Step 9: the order is inserted in command table according to transmission cycle after the first time transmission location of order has been determined
Enter into each corresponding minimum period；The order in command table is rearranged when each insertion or delete command；
Step 10: being inserted into one in corresponding position when the initial phase of certain order changes in optimization process
Item order；
Step 11: being circuited sequentially according to step 7 to ten, so that the command number of a cycle is less than or equal to avr, that is, reach
To the purpose of optimization.
Beneficial effects of the present invention: it in the transmission process of satellite-bone bus data, is calculated by 1553B bus sorting consistence
The optimization command table of the functional characteristic and time response that meet message can be generated in method, which is loaded in bus marco
The transmission of message is driven on device.Meanwhile based on optimization 1553B bus line command table, total Thread Message transmission can be not only reduced
Delay time improves bus bandwidth utilization rate, and the scalability of command table can be improved.
Detailed description of the invention
Fig. 1 is spaceborne 1553B bus communication order optimization flow chart.
Specific embodiment
System based on 1553B bus on star is as shown in Figure 1.It includes bus control unit (BC), a remote terminal
(RT), terminal, mass storage and multiplexer are far set, remote terminal is the payload with RT function.But
Not every payload all has RT function, this just needs far to set function of the terminal to complete RT.It is effective for far setting terminal
Load provides 1553B service, and the data of tissue and acquisition payload are passed in bus.Each terminal on satellite
It is upper that the data stored is needed to be stored in mass storage, and carry out Error Correction of Coding/decoding.The number from various information source
It is to meet the data of data format requirement to be transferred according to multiple connection.Satellite is completed by way of ground receiver by mass storage
Playback of data when device.The above equipment is all by bus control unit (BC) Lai Guanli, it can be seen that BC was managed
Device category is various and quantity is more (≤31).This requires the command table of BC is as needed, order is evenly distributed in always
On line, prevents managerial confusion and emergency event from generating (such as fault data) and bus transfer is impacted.
Under normal circumstances, the data type transmitted on data/address bus is different, data different for type, is passed
The defeated period can it is identical also can be different, call large period the most slow period is transmitted under normal conditions, the period of fastest transmission is referred to as
Minor cycle.Message on satellite is usually and the interaction of earth station that the data volume of message is very big, and 1553B bus is most every time
32 bytes can only be transmitted, the fractionation problem of message can be related in this way, message is splitted into several message blocks, is in bus
Message blocks can be combined into again message in destination by the transmission of message blocks.
Wherein, the concept of frame configuration can be also related in the scope of space flight.Frame configuration is exactly to divide 1s for several numbers
Frame number, the transmission process of order for frame, generally require one order in several frames end of transmission.The biography of order
There are two types of defeated modes, high effective model and affirmation mode.Under high effective model, the transmission of order does not need feedback, that is, works as life
The destination of order receives order and does not need the paid-in information of transmitting terminal feedback command to order.For under high effective model
Order transmission, the message of RT- > BC are to require to have passed in continuous 3 frame, and BC- > RT has been passed in continuous 2 frame, and passes through BC
The message of RT- > RT of transfer then requires to have passed in continuous 5 frame；For setting the message of several access types, either BC- > RT is also
It is that requiring for RT- > BC has passed in continuous 2 frame.In acknowledged mode, the transmission of order needs feedback, i.e., when order
Destination receives the paid-in information of transmitting terminal feedback command needed after order to order.For the biography of data block message
Defeated, the message of RT- > BC is to require to have passed in continuous 5 frame, and BC- > RT has been passed in continuous 4 frame, and passes through BC transfer
The message of RT- > RT then requires to have passed in continuous 9 frame；For setting the message of several access types, either BC- > RT or RT- >
Requiring for BC has passed in continuous 2 frame.
After to the optimization of 1553B bus load, an available 1553B command line order based on the minor cycle.
Wherein, within each minor cycle, order concentrates on the initial phase of a minor cycle, such, does not meet communication frame
The requirement of internal bus load.
For the requirement for adapting to 1553B communication frame in space industry, need to be arranged into order in second step each logical below
Believe in frame, can not only meet bus load requirement in the level of frame, second can also tile bus line command again, obtain more
The bus load requirement of optimization.
The technical solution adopted by the present invention to solve the technical problems: the 1553B bus line command optimization algorithm master to be realized
Wanting task is optimization processing, and the core missions of optimization process are exactly the command list (CLIST) generated after optimization, is communication system
Emulation necessary premise is provided.The main task of optimization process is to complete the division of communication minor cycle, and rationalization disappears
The transmission sequence of breath, generates the bus table of optimization to reduce the bus load of communication system, the two indexs of average delay time,
Improve the performance of communication system.Bus control unit is transmitted with the bus table optimized for foundation organizing messages.Optimized bus life
Enable table that the working efficiency for making communication system is reached ideal state, i.e. bus load and average delay time is optimal.Tool
Body the following steps are included:
Step 1: algorithm makes the load balancing in bus by changing the transmission location for the first time of order；Determine bus message
The maximum cycle T of transmissionmax, transmission large period as command timing table；Determine the minor cycle T of bus message transmissionmin, as
Divide a parameter of large period；Within the time for transmitting a large period message, a large period is divided into P Xiao Zhou
Phase, wherein P=Tmax/Tmin；
Step 2: contained communication frame number m=100 in setting 1 second, this is provided with precondition: for different model
Satellite, communication frame occupied time are different, but requiring the period periodically ordered is the integer of time shared by communication frame
Times, it could have been passed in defined integer frame number is long in this way.It can only be fixed so being had certain limitations to frame number
Certain parameters.According to the number of communication frame, determine that the time span of communication frame is t=1/m.Minor cycle TminInclude n in time
Communication frame, wherein n=Tmin/t；
Step 3: determining the contained byte number N of message, setting message can be divided into M message blocks.If N/32 be it is whole,
Then take M=N/32；If N/32 has remainder, M=[N/32]+1 is taken.
Step 4: the transmission requirement of cycle command is the end of transmission within this period according to the period of this order, so
The maximum allowable delay time of cycle command is its transmission cycle.On a timeline by all message in messaging list according to
Following rule is arranged: being arranged from small to large according to message maximum delay time；The identical message of maximum delay time, according to
Transmission data word length arranges from small to large；In the case that maximum delay time and message transmission data word length are all the same, press
It is arranged according to its serial number in messaging list, forms initial bus line command time-scale.
Step 5: next needing order to be arranged into each to adapt to the requirement of 1553B communicate pin in space industry
In communication frame, the requirement of bus load is not only met in the level of frame, and can tile to form bus line command again, is obtained
To the requirement of optimization bus load.For wherein a piece of news, first message blocks of message are arranged into the i-th frame of minor cycle
Interior, according to the type of order, if it is number access service is set, then the initial position of next message blocks is in i`=(i+1) %n,
Wherein % represents remainder, and n represents communication frame number contained in the minor cycle；It is serviced if not number access is set, then next data
The initial position of block is i`=(i+1) % (n-2), and % represents remainder, and n represents communication frame number contained in the minor cycle.Successively arrange
Column, all message is all arranged in bus list；
Step 6: since the initial phase that the order distribution of minor cycle concentrates on a minor cycle is not inconsistent so
The requirement of hop communication frame internal bus load.Each message only occurs once in message listing file, and in bus list file
All message of required transmission in primary period (large period) are communicated containing one, therefore same message can in bus table
Can occur multiple.The summation Q for calculating the message blocks transmitted in a large period obtains seeking after this message blocks summation
Average value avr=Q/P, wherein P is the number of contained minor cycle in a large period, is obtained in ideally each minor cycle
The order number avr to be transmitted.
Step 7: finding the minor cycle j that first command number is less than average command number.
Step 8: will be arranged in first minor cycle, that last order will be taken out and to delete the order small at this
This order is placed in j-th of the minor cycle found by the transmission location in period, that current transmission is ordered as this article
Primary transmission.
Step 9: position of the order in command table can after order is transmitted for the first time since order is periodic transfer
It is inserted into the corresponding minor cycle with the transmission cycle ordered according to this.In order to control optimization process, in each insertion or
The order in command table is rearranged when delete command.The process rearranged is exactly to the minor cycle each in new command table
The process of interior order number modification.
Step 10: the initial phase (first time transmission location) of certain order can change in optimization process, in this way
It will lead to because the reduction of the order transmission location is likely to occur the case where order is lost in command table.To prevent because of this feelings
Condition causes order to be lost, and should be inserted into an order in corresponding position, the position of insertion according to the order transmission cycle and
It is fixed.The number of transmissions of the message in command table is ensured that in this way, prevents order from losing.
Step 11: circuiting sequentially according to step 7 to ten, the command number of a cycle is made to be less than or equal to average command
Number, that is, achieve the purpose that optimization.
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
Using 1553B bus as backbone bus in certain satellite system, 9 RT are shared in addition to BC, in bus.According to ICD text
Part requirement, amounts to 213 message, wherein periodic messages 182, aperiodic message 131.Wherein maximum cycle is 128s, most
Minor cycle is 0.25s.By applying the optimization algorithm, bus table and input defeated that bus control unit and remote terminal use are generated
Table out.Specific step is as follows:
Step 1: algorithm keeps the load in bus balanced as far as possible by changing the transmission location for the first time of order.Determine bus
The maximum cycle of message transmission is 128s, the transmission cycle as command timing table.Determine the minimum period, be 0.25s, as draw
Divide a parameter of large period.Within the time for transmitting a large period message, all periodic messages at least occur 1 time.Root
It is 128s, minimum period 0.25s according to maximum cycle, a large period can be divided into P=128/0.25=512 Xiao Zhou
Phase.
Step 2: the number m=100 of contained communication frame determines communication frame according to the number of communication frame in setting 1 second
Time span is t=1/m=0.01s, minor cycle TminThe interior time includes n communication frame, wherein n=Tmin/ t=25；
Step 3: determining the contained byte number N of message, setting message can be divided into M message blocks.If N/32 be it is whole,
Then take M=N/32；If N/32 has remainder, M=[N/32]+1 is taken.
Step 4: the transmission requirement of cycle command is the end of transmission within this period according to the period of this order, so
The maximum allowable delay time of cycle command is its transmission cycle.On a timeline by all message in messaging list according to
Following rule is arranged: being arranged from small to large according to message maximum delay time；The identical message of maximum delay time, according to
Transmission data word length arranges from small to large；In the case that maximum delay time and message transmission data word length are all the same, press
It is arranged according to its serial number in messaging list, forms initial bus line command time-scale.
Step 5: next needing order to be arranged into each to adapt to the requirement of 1553B communicate pin in space industry
In communication frame, the requirement of bus load is not only met in the level of frame, and can tile to form bus line command again, is obtained
To the requirement of optimization bus load.For a piece of news, first message blocks of message are arranged into the i-th frame first, are distinguished
One type issued orders, if it is number access service is set, then the initial position of next message blocks is in i`=(i+1) %n,
Middle % represents remainder, and n represents communication frame number contained in the minor cycle, size 25；It is serviced if not number access is set, then it is next
The initial position of a data block is i`=(i+1) % (n-2), and % represents remainder, and n represents communication frame number contained in the minor cycle,
Size is 25.It is arranged successively, all message is all arranged in bus list；
Step 6: since the initial phase that the order distribution of minor cycle concentrates on a minor cycle is not inconsistent so
The requirement of hop communication frame internal bus load.Each message only occurs once in message listing file, and bus list file contains
There are all message that required transmission in primary period (large period) is communicated at one, therefore same message can in bus table
Can occur multiple.The summation Q=2312 for calculating the message blocks transmitted in a large period, after obtaining this message blocks summation
Averaged avr=Q/P ≈ 5 is wanted, wherein P is the number of contained minor cycle in a large period, is obtained ideally each
The order number avr=5 to be transmitted in a minor cycle.
Step 7: finding the minor cycle j=2 that first command number is less than average command number.
Step 8: will be arranged in first minor cycle, that last order will be taken out and to delete the order small at this
This article of order is placed in the 2nd minor cycle found by the transmission location in period, that current transmission is ordered as this article
Primary transmission.
Step 9: position of the order in command table can after order is transmitted for the first time since order is periodic transfer
It is inserted into the corresponding minor cycle with the transmission cycle ordered according to this.In order to control optimization process, in each insertion or
The order in command table is rearranged when delete command.The process rearranged is exactly to the minor cycle each in new command table
The process of interior order number modification.
Step 10: the initial phase of certain order can change in optimization process, will lead in this way because of command table
In the order transmission location reduction be likely to occur order lose the case where.To prevent because such case causes order to be lost,
It should be inserted into an order in corresponding position, depending on the position of insertion is according to the transmission cycle of the order.Ensure that this in this way
The number of transmissions of the message in command table, prevents order from losing.
Step 11: circuiting sequentially according to step 7 to ten, the command number of a cycle is made to be less than or equal to average command
Number, that is, achieve the purpose that optimization.
Claims (1)
1. a kind of spaceborne 1553B bus communication optimization method, it is characterised in that include the following steps:
Step 1: determining the maximum cycle of bus message transmission, the transmission cycle as command timing table；Determine that bus message passes
The defeated minimum period, as a parameter for dividing large period；Within the time for transmitting a maximum cycle message, most by one
Large period is divided into several minimum periods；
Step 2: determining the number m of contained communication frame in 1 second；According to the number of communication frame, determine that the time span of communication frame is
T=1/m；Minimum period TminThe interior time includes n communication frame, wherein n=Tmin/t；
Step 3: determining byte number N contained by message, setting message is divided into M message blocks；If N/32 be it is whole, take M=N/
32；If N/32 has remainder, M=[N/32]+1 is taken；
Step 4: all message in messaging list are arranged from small to large according to message maximum delay time；When maximum delay
Between identical message, according to transmission data word length arrange from small to large；Maximum delay time and message transmission data word length
Message all the same is arranged according to its serial number in messaging list, forms initial bus line command time-scale；
Step 5: first message blocks of message are arranged into the i-th frame for any a piece of news, according to the type of order,
If it is number access service is set, then the initial position of next message blocks is in i`=(i+1) %n, and wherein % represents remainder, n generation
Contained communication frame number in the table minimum period；If not number access service is set, then the initial position of next data block is i`
=(i+1) % (n-2), % represent remainder, and n represents communication frame number contained in the minimum period；It is arranged successively, by all message
It is all arranged in bus list；
Step 6: calculating the summation Q for the message blocks transmitted in a maximum cycle, it is averaged avr, is obtained ideally
The order number avr to be transmitted in each minimum period；
Step 7: finding the minimum period j that first command number is less than avr；
It takes out Step 8: last order will be arranged in first minimum period and deletes the order in this minimum period
Transmission location, which was placed in j-th of minimum period, using current transmission as the transmission of the first time of the order；
Step 9: the order is inserted into command table according to transmission cycle after the first time transmission location of order has been determined
In each corresponding minimum period；The order in command table is rearranged when each insertion or delete command；
Step 10: being inserted into a life in corresponding position when the initial phase of certain order changes in optimization process
It enables；
Step 11: being circuited sequentially according to step 7 to ten, so that the command number of a cycle is less than or equal to avr, that is, reach excellent
The purpose of change.
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| CN106888121B (en) * | 2017-03-01 | 2019-11-29 | 北京控制工程研究所 | A kind of 1553B bus protocol emulation mode based on transmission of data blocks |
| CN107370689B (en) * | 2017-09-08 | 2020-03-31 | 天津津航计算技术研究所 | Message load balancing method of 1553B bus |
| CN110324356B (en) * | 2019-07-17 | 2023-03-31 | 陕西千山航空电子有限责任公司 | Mixed data packet processing method for multi-class bus data |
| CN113515366B (en) * | 2021-04-09 | 2023-11-17 | 北京临近空间飞行器系统工程研究所 | Bus load balancing processing method, device and storage medium |
| CN113591277A (en) * | 2021-07-09 | 2021-11-02 | 北京临近空间飞行器系统工程研究所 | Method for arranging 1553B bus message frames |
| CN114531316A (en) * | 2022-01-18 | 2022-05-24 | 北京临近空间飞行器系统工程研究所 | General service-oriented high-reliability bus system |
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