CN113268200B - Efficient spacecraft safety key data storage method based on streaming mechanism - Google Patents
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Abstract
The high-efficiency storage method for the safety key data of the spacecraft based on the streaming mechanism adopts the principle of 'data self and data place understanding coupling', solidifies data processing logic, realizes that the change influence of the safety key data is limited to only maintaining a safety key data summary table, and reduces the maintenance workload and complexity of the safety key data; based on a 'bit stream' and 'byte stream' maintenance mechanism, the information storage density is remarkably improved aiming at the compression storage mode of the Boolean data item, the batch processing of the safety key data storage and recovery operation is realized, and the consistency of the safety key data storage and recovery is effectively ensured. The invention effectively solves the problems of design and realization of high reliability and high efficiency maintenance of safety key data under the premise of frequent change of storage protocol and limited storage resources of the GNC subsystem of the spacecraft.
Description
Technical Field
The invention relates to a high-efficiency storage method of spacecraft safety key data based on a flow mechanism, provides a system fault breakpoint recovery mechanism, can be used for system reliability design in the aviation and aerospace fields, and belongs to the field of system reliability.
Background
The GNC subsystem is used as one of key subsystems of a spacecraft, the reliability design ensures the stable operation of the GNC subsystem, the most common reliability design is a system fault breakpoint recovery mechanism, and the system recovery based on the periodic storage of safety key data is the safety key data storage and recovery. The safety key data mechanism provides the capability of timely recovering the system faults and continuing the task to run when the faults such as power failure restarting, switching off and the like occur to the system. Along with the continuous increase of the complexity of the spacecraft system, the software maintenance data volume is larger and larger, how to cope with the situations of frequent change of a storage protocol, limited storage resources, complex access function verification and the like, and the reliability and maintainability of safety key data design and implementation are effectively solved, so that the method becomes a difficult problem faced by the system design.
Disclosure of Invention
The invention solves the technical problems that: in the development process of safety key data of the GNC subsystem of the spacecraft, the problems of frequent storage protocol change, limited storage resources and the like are faced, the influence of safety key data change is effectively controlled by adopting the principle of understanding coupling between data and data, the consistency of safety key data storage and recovery is effectively ensured based on a 'bit stream' and 'byte stream' maintenance machine, and the fault tolerance recovery design capability of the GNC subsystem of the spacecraft is improved.
The technical scheme of the invention is as follows: a spacecraft safety key data efficient storage method based on a streaming mechanism comprises the following steps:
step (1), a bit stream data buffer area and a byte stream data buffer area are opened up, a redundant storage area is determined, and step (2) is entered;
step (2), determining safety key data items to be stored according to the requirements of the GNC subsystem of the spacecraft, and entering step (3);
step (3), determining the maximum envelope of the data item type attribute in the step (2), wherein the maximum envelope comprises a Boolean type mark quantity, an integer state quantity, a floating point number operation quantity and reserved data, and entering the step (4);
step (4), defining the data item type attribute set in the step (2), wherein the data types in the data item type attribute set comprise BOOL, UINT08, UINT16, UINT32 and SINGLE, DOUBLE, NULL, and entering the step (5);
step (5), determining a safety key data summary table according to the safety key data items in the step (2), wherein the safety key data summary table comprises data item memory storage addresses, data item type attributes and data item descriptions, and entering the step (6);
step (6), determining a bit stream data buffer data item storage and recovery mechanism: traversing the data item with the BOOL type attribute in the safety key data summary table in the step (5), reading and writing the content of the data item according to the data item storage address, and associating the data item with a bit stream data buffer area through the mutual conversion of the Boolean type and the bit; then go to step (7);
step (7), determining a byte stream data buffer data item storage and recovery mechanism: traversing data items with five types of attributes of UINT08, UINT16, UINT32 and SINGLE, DOUBLE in the safety key data summary table in the step (5), and performing read-out and write-in operation of the data item content according to the data item storage address to associate the data item content with a byte stream data buffer area; then go to step (8);
step (8), periodically performing safety key data storage operation, firstly performing bit stream data buffer data item storage operation in step (6), secondly performing byte stream data buffer data item storage operation in step (7), and entering step (9);
step (9), integrating the contents of the bit stream data buffer area and the byte stream data buffer area, storing the contents into a redundant storage area, completing the spacecraft safety key data storage operation based on a stream mechanism, and entering step (10);
step (10), judging whether the GNC system fault occurs; if the GNC system fault does not occur, returning to the step (8); if the GNC system fails, the step (11) is carried out;
step (11), starting safety key data recovery operation, retrieving the content stored in the step (9) from the redundant storage area, dividing bit stream data and byte stream data, and entering step (12);
and (12) firstly, performing bit stream data buffer data item recovery operation in the step (6), secondly, performing byte stream data buffer data item recovery operation in the step (7), completing spacecraft safety critical data recovery operation based on a stream mechanism, and returning to the step (8).
Further, in the step (1), the bit stream data buffer area and the byte stream data buffer area are temporary storage areas for storing and recovering safety critical data respectively; the redundant storage area is an allocated safety critical data redundant storage area.
Further, in the step (4), the data type NULL is represented as reserved data, and does not participate in the processing operation of the bit stream or byte stream; the other six data types represent exact data, involved in the processing operations of the bit stream or byte stream.
Further, in the step (5), the safety critical data summary table is an object of the operation of the bit stream and the data stream.
Further, in the step (6), the processing logic of the safety key data summary table is loop processing logic, and all the BOOL type data items are processed in a traversing manner, so that the encoding and decoding operations of the data item contents are realized.
Further, in the step (7), the processing logic of the safety key data summary table is loop processing logic, and six types of data items except the BOOL type are processed in a traversing manner, so that the encoding and decoding operations of the content of the data items are realized.
Further, in the step (8), the safety critical data storage operation covers the encoding operation of all the data items in the safety critical data summary table.
Further, in the step (12), the safety critical data recovery operation covers a decoding operation of all data items in the safety critical data summary table.
Furthermore, the principle of understanding coupling between the data and the data is adopted, the data processing logic is solidified, the effect of changing the safety key data is limited to only maintaining a safety key data summary table, and the maintenance workload and complexity of the safety key data are reduced.
A computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the steps of the spacecraft safety critical data high-efficiency storage method based on a stream mechanism when being executed by a processor.
Compared with the prior art, the invention has the advantages that:
(1) According to the high-efficiency storage method for the safety key data of the spacecraft based on the streaming mechanism, which is provided by the invention, the principle that the data design is prior to the data processing is adopted, the data processing logic is solidified, the safety key data change influence is limited to only maintaining a safety key data summary table, and the maintenance workload and complexity of the safety key data are reduced;
(2) The high-efficiency storage method for the safety key data of the spacecraft based on the stream mechanism is based on a bit stream and byte stream maintenance mechanism, remarkably improves the information storage density aiming at the compression storage mode of the Boolean data item, realizes the batched processing of the safety key data storage and recovery operation, and efficiently ensures the consistency of the safety key data storage and recovery.
Drawings
FIG. 1 is a flow chart of the present invention.
Fig. 2 is a schematic diagram of a project implementation principle based on a stream mechanism.
Detailed Description
In order to better understand the technical solutions described above, the following detailed description of the technical solutions of the present application is provided through the accompanying drawings and specific embodiments, and it should be understood that the specific features of the embodiments and embodiments of the present application are detailed descriptions of the technical solutions of the present application, and not limit the technical solutions of the present application, and the technical features of the embodiments and embodiments of the present application may be combined with each other without conflict.
The following describes in further detail a method for efficiently storing spacecraft safety critical data based on a flow mechanism according to an embodiment of the present application with reference to the accompanying drawings, and a specific implementation manner may include (as shown in fig. 1):
in the scheme provided by the embodiment of the application, as shown in fig. 1, a method for efficiently storing spacecraft safety key data based on a streaming mechanism is implemented by the following steps:
(1) And (3) opening up a bit stream data buffer area and a byte stream data buffer area, determining a redundant storage area, and entering the step (2). The sum of the bit stream and byte stream data buffer lengths does not exceed the system allocated safety critical data storage space size.
(2) Determining safety key data items to be stored according to the requirements of the GNC subsystem of the spacecraft, and entering the step (3);
(3) Determining the maximum envelope of the data item type attribute in the step (2), wherein the maximum envelope comprises a Boolean type mark quantity, an integer state quantity, a floating point number operation quantity and reserved data, and entering the step (4). Wherein, the reserved data refers to reserved positions in a storage protocol or data items which are not required to be stored.
(4) Defining the data item type attribute set of the step (2), wherein the data types in the data item type attribute set comprise BOOL, UINT08, UINT16, UINT32 and SINGLE, DOUBLE, NULL, and entering the step (5). Wherein, BOOL type data is compressed and stored according to bits to improve information storage density.
(5) And (3) determining a safety key data summary table according to the safety key data items in the step (2), wherein the safety key data summary table comprises data item memory storage addresses, data item type attributes and data item descriptions, and entering the step (6). The safety critical data summary table is exemplified as follows:
TABLE 1 safety critical data summary table example
| Sequence number | Data item storage address | Data item type attribute | Description of |
| 1 | &sTime | DOUBLE | Time of |
| 2 | &flgADMode | UINT08 | |
| 3 | &bCmgCtrl | BOOL | Whether to allow use of CMG control |
| 4 | &statusWord | UINT16 | 1553B message communication status information |
| 5 | &qbi[0] | DOUBLE | Posture four elements of relative inertial system of the system |
| 6 | &qbi[1] | DOUBLE | Posture four elements of relative inertial system of the system |
| 7 | &qbi[2] | DOUBLE | Posture four elements of relative inertial system of the system |
| 8 | &qbi[3] | DOUBLE | Posture four elements of relative inertial system of the system |
| 9 | &angleAxis[0] | DOUBLE | X-axis estimated attitude angle |
| 10 | &angleAxis[1] | DOUBLE | Y-axis estimated attitude angle |
| 11 | &angleAxis[2] | DOUBLE | Z-axis estimated attitude angle |
| …… | …… | …… | …… |
| …… | …… | …… | …… |
| N | …… | …… | …… |
(6) Determining a bit stream data buffer data item storage and recovery mechanism: traversing the data item with the BOOL type attribute in the safety key data summary table in the step (5), reading and writing the content of the data item according to the data item storage address, and associating the data item with a bit stream data buffer area through the mutual conversion of the Boolean type and the bit; then step (7) is entered. When in storage, traversing all data items in a safety key data summary table, extracting memory values from the data items with BOOL type attributes according to storage addresses, performing compression storage in a single bit form through conversion from Boolean type to bit, and sequentially writing the memory values into a bit stream data buffer area; when recovering, traversing the data item of BOOL type attribute in the safety key data summary table, sequentially reading out single bit values from the 'bit stream' data buffer area, converting the bits into Boolean type, and writing the Boolean value according to the data item storage address.
(7) Determining a byte stream data buffer data item storage and recovery mechanism: traversing data items with five types of attributes of UINT08, UINT16, UINT32 and SINGLE, DOUBLE in the safety key data summary table in the step (5), and performing read-out and write-in operation of the data item content according to the data item storage address to associate the data item content with a byte stream data buffer area; step (8) is then entered. When in storage, traversing all data items in a safety key data summary table, extracting memory values from the data items with five types of attributes such as UINT08/UINT16/UINT32/SINGLE/DOUBLE according to storage addresses, and writing the memory values into a byte stream data buffer area according to the corresponding byte length sequence of the data types; when the data is recovered, traversing the data items of five types of attributes such as UINT08/UINT16/UINT32/SINGLE/DOUBLE in the safety key data summary table, sequentially reading data with corresponding byte length from the byte stream data buffer area, and writing values according to the storage addresses of the data items.
(8) And (3) periodically performing safety key data storage operation, firstly performing bit stream data buffer data item storage operation in the step (6), and secondly performing byte stream data buffer data item storage operation in the step (7), and entering the step (9). The safety critical data storage operation procedure covers the encoding operation of all data items in the safety critical data summary table.
(9) Integrating the contents of the bit stream data buffer area and the byte stream data buffer area, storing the contents into a redundant storage area, completing the spacecraft safety key data storage operation based on a stream mechanism, and entering the step (10). The save operation involves sending data over the bus.
(10) Judging whether the GNC system faults occur or not; if the GNC system fault does not occur, returning to the step (8); if the GNC system failure occurs, the process proceeds to step (11). When the GNC system fails, the system is restarted by recovering the safety key data information.
(11) And (3) starting a safety key data recovery operation, retrieving the content stored in the step (9) from the redundant storage area, dividing bit stream data and byte stream data, and entering the step (12). The resume operation involves receiving data over the bus.
(12) Firstly, the bit stream data buffer data item recovery operation in the step (6) is executed, secondly, the byte stream data buffer data item recovery operation in the step (7) is executed, the spacecraft safety key data recovery operation based on the stream mechanism is completed, and the step (8) is returned. The safety critical data recovery operation procedure covers the decoding operation of all data items in the safety critical data summary table.
The schematic diagram of the implementation principle of the invention is shown in fig. 2.
The present application provides a computer readable storage medium storing computer instructions that, when run on a computer, cause the computer to perform the method described in fig. 1.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
What is not described in detail in the present specification is a well known technology to those skilled in the art.
Claims (9)
1. A spacecraft safety key data efficient storage method based on a streaming mechanism is characterized by comprising the following steps of: the method comprises the following steps:
step (1), a bit stream data buffer area and a byte stream data buffer area are opened up, a redundant storage area is determined, and step (2) is entered;
step (2), determining safety key data items to be stored according to the requirements of the GNC subsystem of the spacecraft, and entering step (3);
step (3), determining the maximum envelope of the data item type attribute in the step (2), wherein the maximum envelope comprises a Boolean type mark quantity, an integer state quantity, a floating point number operation quantity and reserved data, and entering the step (4);
step (4), defining the data item type attribute set in the step (2), wherein the data types in the data item type attribute set comprise BOOL, UINT08, UINT16, UINT32 and SINGLE, DOUBLE, NULL, and entering the step (5);
step (5), determining a safety key data summary table according to the safety key data items in the step (2), wherein the safety key data summary table comprises data item memory storage addresses, data item type attributes and data item descriptions, and entering the step (6);
step (6), determining a bit stream data buffer data item storage and recovery mechanism: traversing the data item with the BOOL type attribute in the safety key data summary table in the step (5), reading and writing the content of the data item according to the data item storage address, and associating the data item with a bit stream data buffer area through the mutual conversion of the Boolean type and the bit; then go to step (7);
step (7), determining a byte stream data buffer data item storage and recovery mechanism: traversing data items with five types of attributes of UINT08, UINT16, UINT32 and SINGLE, DOUBLE in the safety key data summary table in the step (5), and performing read-out and write-in operation of the data item content according to the data item storage address to associate the data item content with a byte stream data buffer area; then go to step (8);
step (8), periodically performing safety key data storage operation, firstly performing bit stream data buffer data item storage operation in step (6), secondly performing byte stream data buffer data item storage operation in step (7), and entering step (9);
step (9), integrating the contents of the bit stream data buffer area and the byte stream data buffer area, storing the contents into a redundant storage area, completing the spacecraft safety key data storage operation based on a stream mechanism, and entering step (10);
step (10), judging whether the GNC system fault occurs; if the GNC system fault does not occur, returning to the step (8); if the GNC system fails, the step (11) is carried out;
step (11), starting safety key data recovery operation, retrieving the content stored in the step (9) from the redundant storage area, dividing bit stream data and byte stream data, and entering step (12);
and (12) firstly, performing bit stream data buffer data item recovery operation in the step (6), secondly, performing byte stream data buffer data item recovery operation in the step (7), completing spacecraft safety critical data recovery operation based on a stream mechanism, and returning to the step (8).
2. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in the step (1), the bit stream data buffer area and the byte stream data buffer area are respectively temporary storage areas for safety key data storage and recovery operations; the redundant storage area is an allocated safety critical data redundant storage area.
3. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in the step (4), the data type NULL is represented as reserved data and does not participate in the processing operation of the bit stream or byte stream; the other six data types represent exact data, involved in the processing operations of the bit stream or byte stream.
4. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in the step (5), the safety critical data summary table is used as an object of the operation of the bit stream and the data stream.
5. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in the step (6), the processing logic of the safety key data summary table is a loop processing logic, and all the BOOL type data items are processed in a traversing way, so that the encoding and decoding operations of the data item contents are realized.
6. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in said step (8), the safety critical data storage operation covers the encoding operation of all data items in the safety critical data summary table.
7. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: in said step (12), the safety critical data recovery operation covers the decoding operation of all data items in the safety critical data summary table.
8. The method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism according to claim 1, wherein the method comprises the following steps: and the data self and data department understanding coupling principle is adopted, the data processing logic is solidified, the effect of changing the safety critical data is limited in the process of only maintaining the safety critical data summary table, and the maintenance workload and complexity of the safety critical data are reduced.
9. A computer readable storage medium storing a computer program, which when executed by a processor performs the steps of the method according to any one of claims 1 to 8.
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| FR2897192A1 (en) * | 2006-02-08 | 2007-08-10 | Gemplus Sa | METHOD OF SECURELY UPDATING VOLATILE MEMORY |
| CN104182508A (en) * | 2014-08-19 | 2014-12-03 | 华为技术有限公司 | Data processing method and data processing device |
| CN108804714A (en) * | 2018-06-30 | 2018-11-13 | 浙江同创空间技术有限公司 | Point cloud data storage method and device |
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