CN117472642A - High-reliability storage method of satellite network data based on coding - Google Patents
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- 238000004590 computer program Methods 0.000 claims description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/085—Error detection or correction by redundancy in data representation, e.g. by using checking codes using codes with inherent redundancy, e.g. n-out-of-m codes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
- G06F3/0619—Improving the reliability of storage systems in relation to data integrity, e.g. data losses, bit errors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/064—Management of blocks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/067—Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
Abstract
The invention discloses a high-reliability storage method of satellite network data based on coding, which aims at solving the problem that the space-based complex electromagnetic environment is easy to cause storage data failure, and by utilizing stronger on-orbit calculation and storage capacity on the satellite, huge on-orbit original data are coded and then are stored in a redundant distributed mode on a plurality of satellites, so that the reliability of data storage can be improved through a certain redundancy, and on the other hand, the storage mode of coding occupies relatively less storage and bandwidth resources, so that the invention can achieve the aim of acquiring higher data storage reliability with smaller network cost on the whole.
Description
Technical Field
The invention relates to the technical field of space satellites, in particular to a high-reliability storage method of satellite network data based on coding.
Background
With the rapid development of satellite internet technology and industry, huge constellation planning is layered endlessly, and on-orbit resources of a satellite network are increasingly enriched, so that on-orbit data with huge scale and increasing growth is brought. However, the space environment is severe, error codes are easy to occur, and the node failure condition is frequent, so that the reliability of the storage service is affected, and therefore, huge data and severe space environment provide great challenges for constructing a good satellite network storage system.
In order to improve the reliability of storage, a distributed storage system is mostly adopted in the aspect of storage management of big data, so that high-reliability service with strong capability, low cost and easy expansion is provided, but large-scale and multi-node data are stored in a severe space environment, and data storage errors are easily generated due to node failure, so that the quality of data storage service is influenced, and therefore, how to realize reliable storage of on-track data becomes a problem to be solved in the present urgent need.
Disclosure of Invention
The invention provides a high-reliability storage method of satellite network data based on coding, which aims to solve the problem that the existing method can not reliably and conveniently store on-orbit data.
In a first aspect, the present invention provides a method for highly reliable storage of encoded satellite network data, the method comprising: the original data Q to be stored is subjected to redundancy segmentation coding, namely the original data Q to be stored is subjected to redundancy segmentation into k data blocks, and each data block is represented as Q i Where i=1, 2, … … k; performing cross coding operation on k data blocks to obtain n coding blocks to be stored, wherein each coding block is defined as R j J=1, 2, … … n, i.e. n R are produced j N code blocks are respectively stored in different storage units on a plurality of satellites, wherein each code block is stored only once; when the user needs to acquire the original data Q, acquiring k 'code blocks from a storage unit storing the code blocks, and restoring the original data Q by decoding, wherein k' is the minimum number of code blocks required by restoring the original data Q, and n>k>k’。
Optionally, the performing redundancy partition encoding on the original data Q to be stored includes: the original data Q to be stored is subjected to segmentation coding through a preset satellite.
Alternatively, satellites that code the raw data Q are determined by a satellite network management system based on the spatial resources of the respective satellites.
Optionally, the satellite network management system is based on control of a command center to trigger determination of satellites that code the raw data Q in a split based on spatial resources of the respective satellites.
Optionally, the method further comprises: determining a distributed storage satellite according to the service area position and the on-board storage resource state through a satellite network management system, establishing a mapping relation between the determined distributed storage satellite and the original data Q, and storing the mapping relation;
and sending the satellites with the determined distributed storage to a command center so that the command center stores the mapping relation.
Optionally, the performing redundancy partition encoding on the original data Q to be stored includes:
and carrying out average segmentation coding on the original data Q to be stored in sequence, wherein each segmented data block has overlapped data with the previous data block and the next data block, namely redundant data is arranged between each segmented data block and the previous data block and the next data block.
Optionally, when the original data Q needs to be updated, the original data Q and the coding block R are retained j Dividing and encoding the data Q' to be updated without change, and obtaining updated dataCoding block R j ' and stored, and then updated coding block R is utilized j 'provide services to the user to ensure availability of updated data Q'.
Optionally, the method further comprises: after the command center receives a data server request sent by any satellite, determining the corresponding original data Q and a storage unit corresponding to a storage block of the original data Q according to the data server request, acquiring k' coding blocks, recovering to obtain the original data Q, and finally feeding back the recovered original data Q to the user terminal through the satellite receiving the data server request.
Optionally, the original data Q is remote sensing data or network operation and maintenance data.
In a second aspect, the present invention provides a computer readable storage medium storing a computer program of signal mapping, which when executed by at least one processor, implements a highly reliable storage method based on encoded satellite network data as defined in any one of the above.
The invention has the following beneficial effects:
the method aims at the problem that the space-based complex electromagnetic environment is easy to cause storage data invalidation, and by utilizing the strong on-orbit computing and storage capacity on the satellite, huge on-orbit original data are encoded and then are stored in a redundant distributed mode on a plurality of satellites, so that the reliability of data storage can be improved through a certain redundancy, and on the other hand, the storage mode of encoding and storage occupies relatively less storage and bandwidth resources, so that the method can achieve the purpose of acquiring higher data storage reliability with lower network cost on the whole.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of a high-reliability storage method for a code-based satellite network according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a data processing flow for high-reliability storage of a code-based satellite network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a data processing flow of a user initiating a high-value data request service according to an embodiment of the present invention.
Detailed Description
Aiming at the problems that the existing large-scale and multi-node on-orbit data are stored in a severe space environment, the data storage errors are easily generated due to node failure, so that the data storage service quality is influenced, and the fault tolerance technology of multi-copy redundant storage is easy to realize, and occupies a large amount of storage and bandwidth resources, and the large number of copies need to be paid with higher storage and bandwidth cost based on the scarcity of resources on the satellites. The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides a high-reliability storage method of satellite network data based on coding, which comprises the following steps of:
s101, performing redundancy segmentation coding on original data Q to be stored, namely performing redundancy segmentation on the original data Q to be stored into k data blocks, wherein each data block is represented as Q i Where i=1, 2, … … k;
specifically, the embodiment of the invention performs division encoding on the original data Q to be stored through a preset satellite, the preset satellite determines the division encoding on the original data Q based on the space resources of each satellite by a satellite network management system, and the satellite network management system in the embodiment of the invention triggers the determination of the division encoding on the satellite based on the space resources of each satellite based on the control of a command center. That is, the embodiment of the invention triggers the function of reliable storage of data based on control of the command center.
It should be noted that, in order to ensure reliability of data storage, in the embodiment of the present invention, the original data Q to be stored is subjected to average division encoding in sequence, where each divided data block has overlapping data with its previous data block and its next data block, that is, each divided data block has redundant data with its previous data block and its next data block.
For example, the original data Q is set to 10, and the original data Q is equally distributed to 10 minutes, and each data redundancy is set to 1.5, and the divided data blocks are sequentially 0-1.5, 1-2.5, 2-3.5, 3-4.5, 4-5.5, 5-6.5, 6-7.5, 7-8.5, 8-9.5, and 8.5-10, and the specific redundancy setting strategy can be set according to actual needs, which will not be discussed in detail in the present invention.
S102, performing cross coding operation on k data blocks to obtain n coding blocks to be stored, wherein each coding block is defined as R j J=1, 2, … … n, i.e. n R are produced j N code blocks are respectively stored in different storage units on a plurality of satellites, wherein each code block is stored only once;
briefly, in the embodiment of the invention, the segmented data block is encoded to obtain the encoded block, and the method in the embodiment of the invention can effectively save network bandwidth through encoding operation.
S103, when a user needs to acquire the original data Q, acquiring k ' code blocks from a storage unit storing the code blocks, and restoring the original data Q through decoding, wherein k ' is the minimum code block number required by restoring the original data Q, and n > k > k '.
In specific implementation, the embodiment of the invention obtains the specific value of k 'through an algorithm based on the number of the data blocks and the specific adopted cross coding operation, and restores the original data Q through decoding after obtaining k' coding blocks.
Specifically, when the original data Q needs to be updated, the embodiment of the present invention retains the original data Q and the coding block R j Dividing and coding the data Q' to be updated without change, and obtaining an updated coding block R j ' and stored, and then updated coding block R is utilized j 'provide services to the user to ensure availability of updated data Q'.
And after the command center receives the data server request sent by any satellite, determining the corresponding original data Q and the storage unit corresponding to the storage block of the original data Q according to the data server request, acquiring k' coding blocks, recovering to obtain the original data Q, and finally feeding the recovered original data Q back to the user terminal through the satellite receiving the data server request.
It should be noted that, in the embodiment of the present invention, the original data Q is various data such as remote sensing data or network operation and maintenance data, which is not limited in particular.
As can be seen from the foregoing, the method according to the embodiment of the present invention performs operations such as data segmentation and encoding on the original data locally, rather than copying and storing all the original data, so that, compared with the prior art, the method can certainly effectively save storage resources and network bandwidth. Whereas the original data Q in the embodiment of the invention is divided into k Q's on average i Data block, cross-coded to formn R i The user only needs to obtain k 'code blocks to restore the original data Q, so that k'<n, the original data can be restored even if all the encoded blocks cannot be acquired due to data errors or node failure, which certainly improves the reliability of data storage.
The method according to the embodiment of the present invention will be explained and illustrated in detail by way of a specific example with reference to fig. 1,2 and 3:
the invention provides a high-reliability storage method of a satellite network based on coding, which is a technology for realizing synchronous coding, namely, data are divided and coded when the data are generated and stored, so that the large storage resource overhead and network transmission cost on the satellite caused by copying the data are avoided, the specific coding mode can be summarized as a three-dimensional array (n, k, k '), wherein n is the number of coding blocks obtained by coding and storing original data, k is the number of data blocks divided by the original data, k ' is the number of coding blocks to be recovered, and the minimum obtained number of the coding blocks is the number of n > k > k ', and the specific coding process is as follows:
(1) When original data Q which needs to be stored, such as remote sensing data, network operation and maintenance data and the like, are generated on the satellite or the ground, the original data Q can be locally subjected to segmentation coding, the original data is segmented into k parts, and each part of data is represented as Q i (i=1, 2, … … k), i.e. k Q i Is a data block of (a);
(2) Then, locally divide k Q' s i Performing cross coding operation on the data blocks to obtain n coding blocks to be stored, wherein each coding block is defined as R j (j=1, 2, … … n), i.e. n R are generated j Is a block of the code of (a);
(3) Then n R are used i The code blocks of the code blocks are respectively stored in different storage units on a plurality of satellites;
(4) When a user needs to acquire the original data Q, the user only needs to acquire k' coding blocks from n storage units on a plurality of satellites, and the original data Q can be restored through a decoding technology.
The data distributed storage method can still provide reliable data storage for users even if partial data is lost or nodes fail (the number of failures is less than n-k'), and compared with a multi-copy fault-tolerant storage method, the method saves storage space, network transmission bandwidth and other satellite scarce resources.
When original data such as remote sensing data and network operation and maintenance on the satellite need to be updated, in order to ensure the usability of the data, the original data Q and the coding block R are reserved firstly j The method comprises the steps of providing services for users without change, and then carrying out processes such as dividing, coding and storing on data Q' needing to be updated to obtain an updated coding block R j And finally, updating the data of the coding block, and providing services for users by using the updated coding block.
The high-reliability storage method of the satellite network based on the codes takes remote sensing data obtained by on-board acquisition as an example:
1) The satellite A acquires a large amount of remote sensing data to be reliably stored, and then selects a satellite B with relatively idle calculation storage resources from surrounding satellites to carry out coding calculation;
2) Dividing the original data Q into k parts on average at satellite B, wherein each part of remote sensing data is Q i ；
3) Then put Q on satellite B i Performing cross coding operation on the remote sensing data to obtain n coding blocks R needing to be stored j ；
4) N code blocks R to be generated j Respectively transmitting the data to storage units on a plurality of satellites for storage;
5) When a user needs to access remote sensing data, the original data can be restored by only acquiring k' coding blocks from the satellite and through a decoding algorithm;
6) When remote sensing data needs to be updated, the original coding block R is reserved firstly j Providing service for users, and carrying out segmentation coding storage on the updated remote sensing data Q' to obtain updated coding blocks R j ' after that, the original code block R is again j Deletion, substitution to R j ' high reliability services continue to be provided to the user.
By the method, remote sensing data is not required to be transmitted back to the ground for data storage, the data access efficiency can be effectively improved by directly storing the remote sensing data on the satellite, and the method for storing codes consumes less on-satellite storage resources, so that a large amount of inter-satellite link bandwidth is saved.
The high-reliability storage method of the satellite network based on the coding takes network operation and data storage on the ground as an example:
1) Generating a large amount of network operation data such as network routing information, user authentication information and the like on the ground, locally dividing the original data Q on the ground into k parts, wherein each part of remote sensing data is Q i ；
2) Then put Q on the ground i Performing cross coding operation on the remote sensing data to obtain n coding blocks R needing to be stored j ；
3) N code blocks R to be generated j Transmitting the data to a plurality of storage units on satellites through a satellite-to-ground link for storage;
4) When a user needs to access network operation and maintenance data, the user does not need to acquire the network operation and maintenance data from the ground center any more, and can restore the original data by acquiring k' coding blocks from the satellite and performing a decoding algorithm;
by the method, the coding operation is performed on the ground, so that the on-board computing power resource is saved, meanwhile, the method for coding and storing consumes less on-board storage resource, and a large amount of scarce satellite-to-ground link bandwidth is saved.
The data processing flow based on the high-reliability storage of the coded satellite network takes the command center to initiate the high-reliability data storage requirement as an example, and consists of two processes of high-value data storage and user data request service.
When the command center has high-value data for high-reliability data storage, referring to fig. 2, the specific storage flow is as follows:
1) The command center makes a request for storing high-value content 'data 1' such as regional situation information on the satellite to a satellite network management system, wherein the requested content comprises information such as a service region, a content size of a stored content name 'data 1' and a reliability requirement;
2) After receiving the command center request, the satellite network management system starts the data code storage service according to the reliability requirement;
3) Taking data1 as input in a command center, completing data segmentation and coding to form a data storage subtask, and feeding back a subtask service area and a storage resource requirement condition to a satellite network management system;
4) The satellite network management system selects Sat2, sat3 and Sat4 to perform distributed storage of high-value data on the planet according to the service area position and the on-satellite storage resource state, and feeds back the result to the command center;
5) The command center sends the subtasks of data storage to Sat2, sat3 and Sat4 respectively, and the subtasks of data storage are distributed for storing the completed data;
6) Meanwhile, the satellite network management system selects Sat1 as a service access point according to the service area position, starts data decoding and summarizing service on the Sat1, and feeds back the distributed storage of the data1 and the address of the service access point Sat1 to the command center;
when a Beijing ground station has satellite-ground link fault/high error code, a user cannot acquire high-reliability data storage service from a ground command center, and when certain data errors occur in Sat2, sat3 and Sat4, the user lifts up a high-value data request service flow as shown in fig. 3, and the method specifically comprises the following steps:
1) A user requests 'data 1' from a command center through a satellite;
2) The command center receives the user request, inquires the stored data1 content on the satellite, and feeds back the address of a service access point Sat1 of the data1 content to the user;
3) A user initiates a data1 content request to an APP (application) address of a Sat1 service access point;
4) And Sat1 pulls the content from Sat2, sat3 and Sat4, decodes and gathers the content, and restores the original data to be fed back to the user.
In general, compared with the multi-copy fault tolerance technology, the method of the embodiment of the invention is a high-reliability storage method based on the satellite network of coding, so the invention can obtain the same or higher data reliability with lower storage cost and is based on codingThe satellite network high-reliability storage method of the codes divides and codes the data, and then the coding blocks are stored in a distributed mode, so that network bandwidth can be effectively saved. In addition, the invention divides the original data Q into k Q averagely i Data block, through cross coding, n R are formed i The user only needs to obtain k 'code blocks to restore the original data Q, so that k'<n, the original data can be restored even if all the encoded blocks cannot be acquired due to data errors or node failure. Therefore, the method of the embodiment of the invention can not only effectively save network bandwidth, but also ensure the reliability of data recovery.
A second embodiment of the present invention provides a computer-readable storage medium storing a computer program of signal mapping, which when executed by at least one processor, implements a high reliability storage method based on encoded satellite network data according to any of the first embodiments of the present invention. The relevant content of the embodiments of the present invention may be understood by referring to the embodiments of the method of the present invention, and will not be described in detail herein.
Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, and accordingly the scope of the invention is not limited to the embodiments described above.
Claims (10)
1. A method for highly reliable storage of satellite network data based on encoding, comprising:
the original data Q to be stored is subjected to redundancy segmentation coding, namely the original data Q to be stored is subjected to redundancy segmentation into k data blocks, and each data block is represented as Q i Where i=1, 2, … … k;
performing cross coding operation on k data blocks to obtain n coding blocks to be stored, wherein each coding block is defined as R j J=1, 2, … … n, i.e. n R are produced j N code blocks are respectively stored in different storage units on a plurality of satellites, wherein each code block is stored only once；
When the user needs to acquire the original data Q, k ' code blocks are acquired from a storage unit storing the code blocks, and the original data Q is restored by decoding, wherein k ' is the minimum code block number required by the original data Q to be restored, and n > k > k '.
2. The method according to claim 1, wherein the redundant partition encoding of the original data Q to be stored comprises:
the original data Q to be stored is subjected to segmentation coding through a preset satellite.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
a preset satellite for dividing and encoding the original data Q is determined based on the space resources of each satellite through a satellite network management system.
4. The method of claim 3, wherein the step of,
the satellite network management system is controlled by the command center to trigger the determination of satellites for dividing and encoding the original data Q based on the space resources of each satellite.
5. The method according to any one of claims 1-4, further comprising:
determining a distributed storage satellite according to the service area position and the on-board storage resource state through a satellite network management system, establishing a mapping relation between the determined distributed storage satellite and the original data Q, and storing the mapping relation;
and sending the satellites with the determined distributed storage to a command center so that the command center stores the mapping relation.
6. The method according to any one of claims 1-4, wherein said redundant partition encoding of the original data Q to be stored comprises:
and carrying out average segmentation coding on the original data Q to be stored in sequence, wherein each segmented data block has overlapped data with the previous data block and the next data block, namely redundant data is arranged between each segmented data block and the previous data block and the next data block.
7. The method according to any one of claims 1 to 4, wherein,
when the original data Q needs to be updated, the original data Q and the coding block R are reserved j Dividing and coding the data Q' to be updated without change, and obtaining an updated coding block R j ' and stored, and then updated coding block R is utilized j 'provide services to the user to ensure availability of updated data Q'.
8. The method according to any one of claims 1-4, further comprising:
after the command center receives a data server request sent by any satellite, determining the corresponding original data Q and a storage unit corresponding to a storage block of the original data Q according to the data server request, acquiring k' coding blocks, recovering to obtain the original data Q, and finally feeding back the recovered original data Q to the user terminal through the satellite receiving the data server request.
9. The method according to any one of claims 1 to 4, wherein,
the original data Q is remote sensing data or network operation and maintenance data.
10. A computer-readable storage medium, characterized in that it stores a computer program of signal mapping, which, when being executed by at least one processor, implements a highly reliable storage method based on encoded satellite network data according to any of claims 1-9.
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