CN110795274A - Single event upset resistant telemetry data access method and system - Google Patents
Single event upset resistant telemetry data access method and system Download PDFInfo
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- CN110795274A CN110795274A CN201911011744.2A CN201911011744A CN110795274A CN 110795274 A CN110795274 A CN 110795274A CN 201911011744 A CN201911011744 A CN 201911011744A CN 110795274 A CN110795274 A CN 110795274A
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- 238000004891 communication Methods 0.000 description 2
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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
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
- G06F11/1048—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using arrangements adapted for a specific error detection or correction feature
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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
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1008—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices
- G06F11/1012—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's in individual solid state devices using codes or arrangements adapted for a specific type of error
Abstract
The invention discloses a single event upset resistant telemetering data access method and a system, wherein the method comprises the following steps: acquiring stored telemetry data formed by an EDAC coding mode from a memory; TMR redundancy judgment is carried out on the telemetering data to obtain judgment telemetering data; obtaining a value of an accompanying vector according to the determined telemetry data; and determining whether the telemetering data has errors according to the corresponding relation between the value of the accompanying vector and the error position, and if so, correcting the telemetering data at the error position to obtain correct telemetering data.
Description
Technical Field
The invention relates to the technical field of aerospace measurement and control communication. And more particularly, to a method and system for accessing telemetry data that is resistant to single event upsets.
Background
In the aerospace measurement and control communication, the telemetry data transmitted by a satellite contains a large amount of key information, when the telemetry data amount is large, the telemetry data is generally stored in a memory firstly after being generated, because a large amount of high-energy particles exist in a space environment, a radiation effect can be generated on an electronic device, a Single Event Upset effect (SEU) can occur on a bistable device used for storing the telemetry data under the radiation effect, the data state in the memory is changed, errors occur in the telemetry data finally, and further serious influence is brought.
Disclosure of Invention
The invention aims to provide a single event upset resistant telemetry data access method, which solves the single event upset effect and improves the reliability of telemetry data. Another object of the present invention is to provide a telemetry data access system that is resistant to single event upsets.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a single event upset resistant telemetering data access method, which comprises the following steps:
acquiring stored telemetry data formed by an EDAC coding mode from a memory;
TMR redundancy judgment is carried out on the telemetering data to obtain judgment telemetering data;
obtaining a value of an accompanying vector according to the determined telemetry data;
and determining whether the telemetering data has errors according to the corresponding relation between the values of the accompanying vectors and the error positions, and if so, correcting the telemetering data at the error positions to obtain correct telemetering data.
Preferably, the method comprises, before retrieving stored telemetry data formed by EDAC encoding from memory:
collecting telemetering data;
EDAC encoding is carried out on the telemetering data according to bytes to obtain a data bit and check bit forming code group;
telemetry data in the form of code blocks are stored in three storage units of a memory, respectively.
Preferably, the obtaining of the telemetry data by making the TMR redundancy decision on the telemetry data specifically includes:
inputting the telemetry data stored in the three storage units into a three-mode voter;
and performing three-out-of-two decision on the three telemetering data according to the bit by a three-mode voter to obtain decision telemetering data.
Preferably, the code group C is
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
Wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,
is an exclusive or operation.
Preferably, the companion vector S3～S0Is composed of
The invention also discloses a single event upset resistant telemetering data access system, which comprises:
the data reading control module is used for acquiring the stored telemetry data formed in an EDAC coding mode from the memory;
the three-mode voting module is used for carrying out TMR redundancy judgment on the telemetry data to obtain judgment telemetry data;
and the EDAC decoder is used for obtaining a value of an accompanying vector according to the telemetry data, determining whether the telemetry data has errors according to the corresponding relation between the value of the accompanying vector and the error position, and correcting the telemetry data at the error position to obtain correct telemetry data if the telemetry data has errors.
Preferably, the system further comprises:
the telemetering data acquisition module is used for acquiring telemetering data;
the EDAC coder is used for carrying out EDAC coding on the telemetering data according to bytes to obtain a data bit and check bit forming code group;
and the SRAM three-mode storage control module is used for respectively storing the telemetering data in the form of code blocks into three storage units of the memory.
Preferably, the three-module voting module is specifically configured to perform two-out-of-three decision on the three telemetry data according to bits to obtain decision telemetry data.
Preferably, the code group C is
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
Wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,
is an exclusive or operation.
Preferably, the companion vector S3～S0Is composed of
In order to solve the problem caused by single event upset, the invention adopts an EDAC (error Detection and reception) coding mode to store telemetering data, performs Triple Modular Redundancy (TMR) storage and judgment on the EDAC coded telemetering data, calculates the value of a random vector according to the judged telemetering data obtained by judgment, can determine whether the data at each bit position of the telemetering data has errors caused by single event upset according to the value of the random vector, and corrects the errors if the errors exist, thereby obtaining correct telemetering data.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a flow chart of an embodiment of a single event upset resistant telemetry data access method of the present invention;
FIG. 2 is a second flowchart of a single event upset resistant telemetry data access method according to an embodiment of the present invention;
FIG. 3 is a third flowchart of an embodiment of a single event upset resistant telemetry data access method of the present invention;
FIG. 4 is a block diagram illustrating an embodiment of a single event upset resistant telemetry data access system according to the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
According to one aspect of the invention, the embodiment discloses a telemetry data access method resistant to single event upset. As shown in fig. 1, in this embodiment, the method includes:
s100: and acquiring the stored telemetry data formed by the EDAC coding mode from the memory.
S200: TMR redundancy judgment is carried out on the telemetry data to obtain judgment telemetry data.
S300: and obtaining a value of an accompanying vector according to the telemetry data, determining whether the telemetry data has errors according to the corresponding relation between the value of the accompanying vector and the position of the telemetry data, and if the telemetry data has errors, correcting the telemetry data at the wrong position to obtain correct telemetry data.
In order to solve the problem caused by single event upset, the invention adopts an EDAC (error Detection and reception) coding mode to store telemetering data, performs Triple Modular Redundancy (TMR) storage and judgment on the EDAC coded telemetering data, calculates the value of a random vector according to the judged telemetering data obtained by judgment, can determine whether the data at each bit position of the telemetering data has errors caused by single event upset according to the value of the random vector, and corrects the errors if the errors exist, thereby obtaining correct telemetering data.
In a preferred embodiment, as shown in fig. 2, the method may include, before S100:
s010: telemetry data is collected.
S020: and EDAC encoding is carried out on the telemetering data according to bytes to obtain a data bit and check bit forming code group.
S030: telemetry data in the form of code blocks are stored in three storage units of a memory, respectively. In this embodiment, the memory is an SRAM memory, and the telemetry data is stored in the SRAM memory in three identical backup forms, for example, as the same telemetry data a, telemetry data B, and telemetry data C. The data reading control module in this embodiment is an SRAM reading control module, and may read the telemetry data a, the telemetry data B, and the telemetry data C stored in the SRAM memory to obtain data a, data B, and data C, and input the data a, the data B, and the data C to the EDAC decoder, respectively. And after error correction is carried out by the EDAC decoder, correct telemetering data is obtained and then can be sent out by the telemetering data sending module.
Specifically, after the telemetry data is collected, EDAC encoding can be performed on the telemetry data in units of bytes, that is, data of 8 bit data bits of each byte of the telemetry data is encoded to obtain check bits of 4 bits, and the data bits and the check bits are stored in a memory as the telemetry data.
In a specific example, a Hamming code is a common coding method used by EDAC, and a code group C obtained by encoding telemetry data with the Hamming code can be represented as:
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,
is an exclusive or operation.
Further, when reading data from the memory, the data bits and the check bits are read out together, and an accompanying vector of the Hamming code C is calculated, the accompanying vector S3～S0Can be obtained by the following calculation formula:
in a preferred embodiment, as shown in fig. 3, the S200 may specifically include:
s210: telemetry data stored in the three storage units is input to a triple-mode voter.
S220: and performing three-out-of-two decision on the three telemetering data according to the bit by a three-mode voter to obtain decision telemetering data.
The invention judges the stored telemetering data through TMR redundancy to obtain the judged telemetering data, compares a plurality of telemetering data which are simultaneously stored through redundancy judgment, can determine a plurality of same data as correct data bit data due to smaller error probability, and can improve the probability of the output judgment telemetering data as originally stored telemetering data to a certain extent. In the preferred embodiment, during storage, the same telemetry data is stored in three storage units of the memory respectively, the triple-mode voter compares data of each bit in the three telemetry data, and at least two same data in the three data of the same bit are selected as data for judging the corresponding position of the telemetry data.
In a preferred embodiment, if the telemetry data in the memory has a data error of only one bit, the accompanying vector can indicate the location of the error, and the presence or absence of the error is determined by combining the actually obtained values of the accompanying vector according to the correspondence between the values of the accompanying vector and the error location shown in table 1, for example, and if there is an error location, the error location can be corrected by turning the data corresponding to the error location once to obtain correct telemetry data.
TABLE 1
Based on the same principle, the invention also discloses a telemetering data access system resisting the single event upset. As shown in fig. 4, in the present embodiment, the system includes a data reading control module, a triple-module voting module 6, and an EDAC decoder 7.
The data reading control module is used for acquiring the stored telemetry data formed by an EDAC coding mode from the memory.
And the three-mode voting module 6 is used for carrying out TMR redundancy judgment on the telemetry data to obtain judged telemetry data.
The EDAC decoder 7 is used for obtaining a value of an accompanying vector according to the telemetry data, determining whether the telemetry data has errors according to the corresponding relation between the value of the accompanying vector and the error position, and correcting the telemetry data at the error position to obtain correct telemetry data if the telemetry data has errors.
In a preferred embodiment, the system further comprises a telemetry data acquisition module 1, an EDAC encoder 2 and an SRAM three-mode memory control module 3.
The telemetry data acquisition module 1 is used for acquiring telemetry data.
The EDAC encoder 2 is used for carrying out EDAC encoding on the telemetering data according to bytes to obtain a data bit and check bit forming code group.
The SRAM three-mode memory control module 3 is used for respectively storing the telemetering data in the form of code blocks into three memory units of the memory. In this embodiment, the memory is an SRAM memory 4, and the telemetry data is stored in the SRAM memory 4 in three identical backup forms, for example, as the same telemetry data a, telemetry data B, and telemetry data C. The data reading control module in this embodiment is an SRAM reading control module 5, which can read the telemetry data a, the telemetry data B, and the telemetry data C stored in the SRAM memory 4 to obtain data a, data B, and data C, and input the data a, the data B, and the data C to the EDAC decoder 7, respectively. Correct telemetering data is obtained after error correction is carried out through the EDAC decoder, and then the correct telemetering data can be sent out through the telemetering data sending module 8.
Specifically, after the telemetry data is collected, EDAC encoding can be performed on the telemetry data in units of bytes, that is, data of 8 bit data bits of each byte of the telemetry data is encoded to obtain check bits of 4 bits, and the data bits and the check bits are stored in a memory as the telemetry data.
In a specific example, a Hamming code is a common coding method used by EDAC, and a code group C obtained by encoding telemetry data with the Hamming code can be represented as:
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,
is an exclusive or operation.
Further, when reading data from the memory, the data bits and the check bits are read out together, and an accompanying vector of the Hamming code C is calculated, the accompanying vector S3～S0Can be obtained by the following calculation formula:
in a preferred embodiment, the triple-mode voting module 6 is specifically configured to perform bit-by-bit triple-out-two decision on three pieces of telemetry data to obtain decision telemetry data.
The invention judges the stored telemetering data through TMR redundancy to obtain the judged telemetering data, compares a plurality of telemetering data which are simultaneously stored through redundancy judgment, can determine a plurality of same data as correct data bit data due to smaller error probability, and can improve the probability of the output judgment telemetering data as originally stored telemetering data to a certain extent. In the preferred embodiment, during storage, the same telemetry data is stored in three storage units of the memory respectively, the triple-mode voter compares data of each bit in the three telemetry data, and at least two same data in the three data of the same bit are selected as data for judging the corresponding position of the telemetry data.
In a preferred embodiment, if the telemetry data in the memory has a data error of only one bit, the accompanying vector can indicate the location of the error, and the presence or absence of the error is determined by combining the actually obtained values of the accompanying vector according to the correspondence between the values of the accompanying vector and the error location shown in table 1, for example, and if there is an error location, the error location can be corrected by turning the data corresponding to the error location once to obtain correct telemetry data.
Since the principle of the system for solving the problem is similar to the above method, the implementation of the system can refer to the implementation of the method, and the detailed description is omitted here.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A telemetry data access method resisting single event upset is characterized by comprising the following steps:
acquiring stored telemetry data formed by an EDAC coding mode from a memory;
TMR redundancy judgment is carried out on the telemetering data to obtain judgment telemetering data;
obtaining a value of an accompanying vector according to the determined telemetry data;
and determining whether the telemetering data has errors according to the corresponding relation between the values of the accompanying vectors and the error positions, and if so, correcting the telemetering data at the error positions to obtain correct telemetering data.
2. The telemetry data access method of claim 1, comprising, prior to retrieving stored telemetry data formed by EDAC encoding from memory:
collecting telemetering data;
EDAC encoding is carried out on the telemetering data according to bytes to obtain a data bit and check bit forming code group;
telemetry data in the form of code blocks are stored in three storage units of a memory, respectively.
3. The telemetry data accessing method of claim 2, wherein the TMR redundancy decision of the telemetry data to determine the telemetry data specifically comprises:
inputting the telemetry data stored in the three storage units into a three-mode voter;
and performing three-out-of-two decision on the three telemetering data according to the bit by a three-mode voter to obtain decision telemetering data.
4. The telemetry data access method of claim 2 wherein code group C is
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
Wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,
is an exclusive or operation.
5. The telemetry data access method of claim 4 wherein the companion vector S3～S0Is composed of
6. A single event upset resistant telemetry data access system, comprising:
the data reading control module is used for acquiring the stored telemetry data formed in an EDAC coding mode from the memory;
the three-mode voting module is used for carrying out TMR redundancy judgment on the telemetry data to obtain judgment telemetry data;
and the EDAC decoder is used for obtaining a value of an accompanying vector according to the telemetry data, determining whether the telemetry data has errors according to the corresponding relation between the value of the accompanying vector and the error position, and correcting the telemetry data at the error position to obtain correct telemetry data if the telemetry data has errors.
7. The telemetry data access system of claim 6, further comprising:
the telemetering data acquisition module is used for acquiring telemetering data;
the EDAC coder is used for carrying out EDAC coding on the telemetering data according to bytes to obtain a data bit and check bit forming code group;
and the SRAM three-mode storage control module is used for respectively storing the telemetering data in the form of code blocks into three storage units of the memory.
8. The telemetry data access system of claim 7, wherein the triple-mode voting module is specifically configured to perform a bit-by-bit triple-out-of-two decision on three telemetry data to obtain a decision telemetry data.
9. The telemetry data access system of claim 7 wherein code group C is
C＝[DB7,DB6,DB5,DB4,DB3,DB2,DB1,DB0,CB3,CB2,CB1,CB0]
Wherein, DB7～DB0For data bits, CB3～CB0In order to check the bits of the data,is an exclusive or operation.
10. The telemetry data access system of claim 9 wherein the companion vector S3～S0Is composed of
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