CN113268200A - Spacecraft safety key data efficient storage method based on flow mechanism - Google Patents
Spacecraft safety key data efficient storage method based on flow mechanism Download PDFInfo
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Abstract
A spacecraft safety key data efficient storage method based on a flow mechanism adopts a principle of decoupling data self and data processing, data processing logic is solidified, safety key data change influence is limited to only maintaining a safety key data summary table, and safety key data maintenance workload and complexity are reduced; based on a 'bit stream' and 'byte stream' maintenance mechanism, the information storage density is obviously improved aiming at a compression storage mode of Boolean type data items, the batch processing of safety key data storage and recovery operation is realized, and the safety key data storage and recovery consistency is efficiently ensured. The method effectively solves the problems of safety key data design and high reliability and high efficiency maintenance under the premise of frequent change of storage protocols and limited storage resources of the GNC subsystem of the spacecraft.
Description
Technical Field
The invention relates to a spacecraft safety key data efficient storage method based on a stream mechanism, provides a system fault breakpoint recovery mechanism, can be used for system reliability design in the fields of aviation and aerospace, and belongs to the field of system reliability.
Background
The GNC subsystem is used as one of key subsystems of a spacecraft, the stable operation of the GNC subsystem is ensured by reliability design, 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 'safety key data storage and recovery'. The safety key data mechanism provides the system with the capability of timely recovering system faults and continuing task operation when the system has faults such as power failure restart, tripping and the like. With the increasing complexity of a spacecraft system, the software maintenance data volume is larger and larger, and how to deal with the conditions of frequent change of a storage protocol, limited storage resources, complex verification of access functions and the like, the reliability and maintainability of safety key data design and realization are effectively solved, and the problem becomes a difficult problem for system design.
Disclosure of Invention
The technical problem solved by the invention is as follows: in the process of developing safety key data of a GNC subsystem of a spacecraft, the problems of frequent change of a storage protocol, limited storage resources and the like are faced, the change influence of the safety key data is effectively controlled by adopting a principle of decoupling data self and data processing, the consistency of the storage and recovery of the safety key data is effectively ensured based on a maintenance mechanism of 'bit stream' and 'byte stream', and the fault-tolerant recovery design capability of the GNC subsystem of the spacecraft is improved.
The technical solution of the invention is as follows: a spacecraft safety key data efficient storage method based on a flow mechanism comprises the following steps:
step (1), opening up a bit stream data buffer area and a byte stream data buffer area, determining a redundant storage area, and entering step (2);
step (2), determining a safety key data item 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 type attribute of the data item in the step (2), including Boolean type flag quantity, integer state quantity, floating point number operand 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, SINGLE, DOUBLE and 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 items of the BOOL type attributes in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the data items with a bit stream data buffer area through mutual conversion of Boolean types and bits; then entering step (7);
step (7), determining a data item storage and recovery mechanism of the byte stream data buffer: traversing five types of attribute data items of UINT08, UINT16, UINT32, SINGLE and DOUBLE in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the content of the data items with a byte stream data buffer area; then entering step (8);
step (8), periodically performing safety key data storage operation, firstly performing the bit stream data buffer data item storage operation of step (6), secondly performing the byte stream data buffer data item storage operation of 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, finishing the storage operation of the spacecraft safety key data based on the stream mechanism, and entering step (10);
step (10), judging whether a GNC system fault occurs or not; if the GNC system fault does not occur, returning to the step (8); if the GNC system fault occurs, entering a step (11);
step (11), starting a safety key data recovery operation, retrieving the content stored in step (9) from a redundant storage area, dividing bit stream data and byte stream data, and entering step (12);
and (12) firstly executing the data item recovery operation of the bit stream data buffer area in the step (6), secondly executing the data item recovery operation of the byte stream data buffer area in the step (7), completing the spacecraft safety key data recovery operation based on the 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 safety key data storage and recovery operations 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 the byte stream; the other six data types represent exact data and participate in the processing operations of the bitstream or byte stream.
Further, in the step (5), the safety-critical data summary table is used as an object of the bit stream and data stream operation.
Further, in the step (6), the processing logic of the safety-critical data summary table is a loop processing logic, and traverses all the BOOL type data items to implement the encoding and decoding operations of the data item contents.
Further, in the step (7), the processing logic of the safety-critical data summary table is a loop processing logic, and the six types of data items except for the BOOL type are processed in a traversing manner, so that the encoding and decoding operations of the data item contents are realized.
Further, in the step (8), the safety-critical data storage operation covers the encoding operation of all data items in the safety-critical data summary table.
Further, in step (12), the safety-critical data recovery operation overrides the decoding operation of all data items in the safety-critical data summary table.
Furthermore, a data self and data processing decoupling principle is adopted, data processing logic is solidified, the effect of safety key data change is limited to only maintaining a safety key data summary table, and the workload and complexity of safety key data maintenance are reduced.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method for efficient storage of safety-critical data of a spacecraft based on a streaming mechanism.
Compared with the prior art, the invention has the advantages that:
(1) according to the spacecraft safety key data efficient storage method based on the flow mechanism, the principle that data design is prior to data processing is adopted, data processing logic is solidified, the safety key data change influence is limited to only maintaining a safety key data summary table, and the safety key data maintenance workload and complexity are reduced;
(2) the efficient storage method of the safety key data of the spacecraft based on the stream mechanism is based on the bit stream and byte stream maintenance mechanisms, obviously improves the information storage density aiming at the compression storage mode of Boolean type data items, realizes the batch 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 flow mechanism.
Detailed Description
In order to better understand the technical solutions, the technical solutions of the present application are described in detail below with reference to the drawings and specific embodiments, and it should be understood that the specific features in the embodiments and examples of the present application are detailed descriptions of the technical solutions of the present application, and are not limitations of the technical solutions of the present application, and the technical features in the embodiments and examples of the present application may be combined with each other without conflict.
The efficient storage method for safety critical data of a spacecraft based on a streaming mechanism provided by the embodiment of the present application is further described in detail below with reference to the accompanying drawings of the specification, and specific implementations may include (as shown in fig. 1):
in the solution provided in the embodiment of the present application, as shown in fig. 1, a method for efficiently storing safety critical data of a spacecraft based on a streaming mechanism includes the following implementation 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 size.
(2) Determining safety key data items needing to be stored according to the requirements of a GNC subsystem of the spacecraft, and entering the step (3);
(3) and (4) determining the maximum envelope of the type attribute of the data item in the step (2), including Boolean type flag quantity, integer state quantity, floating point number operand and reserved data, and entering the step (4). Where reserved data refers to reserved locations in the storage protocol or data items that are not to be stored.
(4) Defining a 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, SINGLE, DOUBLE and 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 a step (6). An example of a safety critical data summary table is as follows:
TABLE 1 example safety critical data summary Table
| Serial number | Data item storage address | Data item type attributes | Description of |
| 1 | &sTime | DOUBLE | Star |
| 2 | &flgADMode | UINT08 | |
| 3 | &bCmgCtrl | BOOL | Whether CMG control is allowed |
| 4 | &statusWord | UINT16 | 1553B message communication state informationInformation processing device |
| 5 | &qbi[0] | DOUBLE | Attitude four elements of the main system relative to the inertial system |
| 6 | &qbi[1] | DOUBLE | Attitude four elements of the main system relative to the inertial system |
| 7 | &qbi[2] | DOUBLE | Attitude four elements of the main system relative to the inertial system |
| 8 | &qbi[3] | DOUBLE | Attitude four elements of the main system relative to the inertial 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 pre-estimated attitude angle |
| …… | …… | …… | …… |
| …… | …… | …… | …… |
| N | …… | …… | …… |
(6) Determining a bit stream data buffer data item storage and recovery mechanism: traversing the data items of the BOOL type attributes in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the data items with a bit stream data buffer area through mutual conversion of Boolean types and bits; then step (7) is entered. When storing, traversing all data items in the safety key data summary table, extracting memory values of the data items of the BOOL type attribute according to storage addresses, performing Boolean type-to-bit conversion, performing compression storage in a single bit form, and sequentially writing the memory values into a 'bit stream' data buffer area; when the data is recovered, traversing the data items of the BOOL type attribute in the safety key data summary table, sequentially reading single bit values from the 'bit stream' data buffer area, and writing Boolean values according to the storage addresses of the data items through the conversion from the bits to the Boolean type.
(7) Determining a byte stream data buffer data item storage and recovery mechanism: traversing five types of attribute data items of UINT08, UINT16, UINT32, SINGLE and DOUBLE in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the content of the data items with a byte stream data buffer area; then step (8) is entered. When storing, traversing all data items in the safety key data summary table, extracting memory values of the data items with five types of attributes such as UINT08/UINT16/UINT32/SINGLE/DOUBLE and the like according to storage addresses, and writing the memory values into a byte stream data buffer area according to the byte length sequence corresponding to the data types; when recovering, traversing five types of attribute data items such as UINT08/UINT16/UINT32/SINGLE/DOUBLE in the safety key data summary table, sequentially reading data with corresponding byte length from the data buffer area of the 'byte stream', and writing numerical values according to the storage addresses of the data items.
(8) And (4) periodically carrying out safety critical data storage operation, firstly carrying out the storage operation of the data item in the bit stream data buffer area in the step (6), secondly carrying out the storage operation of the data item in the byte stream data buffer area in the step (7), and entering the step (9). The safety-critical data storage operation process covers the encoding operation of all data items in the safety-critical data summary table.
(9) And (5) 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, finishing the spacecraft safety key data storage operation based on the stream mechanism, and entering the step (10). The save operation involves sending data over the bus.
(10) Judging whether a GNC system fault occurs or not; if the GNC system fault does not occur, returning to the step (8); if a GNC system failure occurs, the process proceeds to step (11). When a GNC system failure occurs, the system is restarted by recovering the safety critical data information.
(11) And (4) starting a safety-critical data recovery operation, retrieving the content stored in the step (9) from the redundant storage area, dividing the bit stream data and the byte stream data, and entering the step (12). The recovery operation involves receiving data over the bus.
(12) And (4) firstly executing the bit stream data buffer area data item recovery operation in the step (6), secondly executing the byte stream data buffer area data item recovery operation in the step (7), completing the spacecraft safety key data recovery operation based on the stream mechanism, and returning to the step (8). 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 figure 2.
A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of fig. 1.
As will be appreciated by one skilled in the art, 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, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (10)
1. A spacecraft safety key data efficient storage method based on a flow mechanism is characterized in that: the method comprises the following steps:
step (1), opening up a bit stream data buffer area and a byte stream data buffer area, determining a redundant storage area, and entering step (2);
step (2), determining a safety key data item 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 type attribute of the data item in the step (2), including Boolean type flag quantity, integer state quantity, floating point number operand 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, SINGLE, DOUBLE and 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 items of the BOOL type attributes in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the data items with a bit stream data buffer area through mutual conversion of Boolean types and bits; then entering step (7);
step (7), determining a data item storage and recovery mechanism of the byte stream data buffer: traversing five types of attribute data items of UINT08, UINT16, UINT32, SINGLE and DOUBLE in the safety key data summary table in the step (5), reading and writing the content of the data items according to the storage addresses of the data items, and associating the content of the data items with a byte stream data buffer area; then entering step (8);
step (8), periodically performing safety key data storage operation, firstly performing the bit stream data buffer data item storage operation of step (6), secondly performing the byte stream data buffer data item storage operation of 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, finishing the storage operation of the spacecraft safety key data based on the stream mechanism, and entering step (10);
step (10), judging whether a GNC system fault occurs or not; if the GNC system fault does not occur, returning to the step (8); if the GNC system fault occurs, entering a step (11);
step (11), starting a safety key data recovery operation, retrieving the content stored in step (9) from a redundant storage area, dividing bit stream data and byte stream data, and entering step (12);
and (12) firstly executing the data item recovery operation of the bit stream data buffer area in the step (6), secondly executing the data item recovery operation of the byte stream data buffer area in the step (7), completing the spacecraft safety key data recovery operation based on the stream mechanism, and returning to the step (8).
2. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: 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 key data respectively; the redundant storage area is an allocated safety-critical data redundant storage area.
3. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: 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 the byte stream; the other six data types represent exact data and participate in the processing operations of the bitstream or byte stream.
4. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: in the step (5), the safety-critical data summary table is used as an object for bit stream and data stream operation.
5. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: in the step (6), the processing logic of the safety key data summary table is a circular processing logic, and all BOOL type data items are processed in a traversing manner, so that the encoding and decoding operations of the data item contents are realized.
6. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: in the step (7), the processing logic of the safety key data summary table is a circular processing logic, and six types of data items except the BOOL type are processed in a traversing manner, so that the encoding and decoding operation of the data item content is realized.
7. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: in the step (8), the safety-critical data storage operation covers the encoding operation of all data items in the safety-critical data summary table.
8. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: in said step (12), the safety critical data recovery operation overrides the decoding operation of all data items in the safety critical data summary table.
9. The efficient storage method for safety-critical data of a spacecraft based on a streaming mechanism according to claim 1, characterized in that: the data self and data processing decoupling principle 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 safety key data maintenance workload and complexity are reduced.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 9.
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| US20030028896A1 (en) * | 2001-08-03 | 2003-02-06 | Swart William D. | Video and digital multimedia aggregator remote content crawler |
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