CN118283147A - Method and device for analyzing multiplexing protocol data unit based on CCSDS specification - Google Patents
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Abstract
The invention discloses a method for analyzing multiplexing protocol data units based on CCSDS (common control data space division multiplexing) specification, which adopts an FPGA (field programmable gate array) parallel processing and pipelining mode to realize the high-speed unpacking processing of the multiplexing protocol data units; and the package unpacking flow is divided into two flows of multiplexing protocol data unit segmentation and package analysis, so that the range of fault diffusion of multiplexing protocol data units and package is effectively limited, and the reliability requirements of fault isolation and fault self-recovery are met.
Description
Technical Field
The invention belongs to the technical field of spatial data processing, and particularly relates to a method and a device for analyzing multiplexing protocol data units based on CCSDS (common carrier space data standard).
Background
The CCSDS is known as the Committee for consultation of space data systems (Consultive Committee for SPACE DATA SYSTEM, CCSDS) and is responsible for developing and adopting various communication protocols and data processing specifications suitable for aerospace measurement and control and data transmission systems so that data exchange and processing can be performed in a standardized manner. The goal of CCSDS advanced on-orbit system (Advanced Orbit Systems, AOS) proposal is to build a data management system related to space-ground or space-space, and to face the broadband data communication requirement from small capacity, low speed to large capacity and high speed, and provide dynamic data packet automatic routing and multi-user networking capability, thereby building a wide three-dimensional global data network between different space local area networks and between space and ground systems. Multiplexing protocol data units (Multiplexing ProtocolData Unit, MPDUs) as the most important multiplexing data unit of AOS, encapsulating multi-service CCSDS data packets into a standard protocol data format has become one of the common methods of spatial data processing.
Currently, a spacecraft generally uses a cpu to complete the process of packaging and unpacking the multiplexing protocol data units, which is limited by the performance of the cpu, and cannot meet the requirements of higher and higher multiplexing protocol data units and unpacking processing of the spacecraft. Secondly, the space vehicle is generally unattended, and has higher requirements on fault isolation and fault self-recovery.
Disclosure of Invention
The invention aims to provide a method and a device for analyzing multiplexing protocol data units based on CCSDS (common carrier space division multiple access) specifications, which solve the outstanding problems of insufficient processing capacity, fault isolation, autonomous recovery and the like of multiplexing protocol data units of the existing aircraft products.
In order to solve the problems, the technical scheme of the invention is as follows:
a method of resolving a multiplexing protocol data unit based on a CCSDS specification, comprising:
acquiring a multiplexing protocol data unit MPDU, dividing MPDU data packets and analyzing encapsulation packets;
wherein the splitting of the MPDU data packet includes:
Extracting the head pointers of the first two bytes of the current MPDU data packet, performing validity judgment on the head pointers, counting the current MPDU data if the head pointers are legal, and starting data receiving and writing into a cache when the head pointers point to preset positions in the data packet;
receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, performing validity judgment on the head pointers, if the head pointers are legal, continuing to receive data, and writing the data into a cache; if not, the packet divider is forcedly written, the packet count is +1, and the data is not received any more;
the encapsulating packet parsing of the MPDU data packet comprises:
reading the data in the cache, judging the type of the packet head data, and if the packet head data is a segmenter, exiting unpacking; if the identifier is legal, reading the length information of the package, continuously outputting package data according to the length information, and inserting a corresponding waiting period according to the interval requirement of the package so as to analyze the next package.
According to an embodiment of the invention, a state machine is adopted to realize segmentation control of MPDU data packets:
S1: an idle state, waiting for MPDU data packet input; after receiving the MPDU data packet, extracting the head pointers of the first two bytes of the current MPDU data packet, and judging the legality of the head pointers; if not, not starting receiving and keeping an idle state S1; if the data is legal, the received data is counted, and when the head pointer points to the appointed position in the packet data, the receiving is started, and S2 is entered;
S2: receiving data and writing the data into a cache; judging whether the current MPDU data packet is finished or not at the same time, and if so, entering S3;
S3: receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, and judging the legality of the head pointers; if the data is legal, entering into S4, and continuing to receive the data; if not, entering S5;
S4: receiving data and writing the data into a cache; judging whether the current MPDU data packet is finished or not at the same time, and if so, entering S3; if not, and when the leading pointer points to the appointed position in the packet data, entering S6;
S5: the packet separator is forcedly written, the packet count is +1, and the data is no longer received, and then S1 is entered, waiting for the next data reception task.
S6: the packet separator is forcedly written, packet count +1, and then S2 is entered, and data reception is continued.
According to an embodiment of the invention, a state machine is adopted to realize package analysis control of MPDU data:
a1: in an idle state, when more than one split packet is cached, entering into A2, and starting a packet unpacking process;
A2: reading cache data and judging the type of packet head data; if the packet is the separator, exiting the unpacking flow, and entering A1; if the packet identifier is the idle packet identifier, entering A7; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
a3: firstly, reading the length information of the package, and if the length information is wrong, entering A6; if the length information is correct, continuously outputting package data according to the length information, and entering A4 after finishing;
A4: inserting a corresponding waiting period according to the interval requirement of the packaging package;
A5: reading the next package and judging the package head data type; if the packet is the separator, exiting the unpacking flow, and entering A8; if the packet identifier is the idle packet identifier, entering A7; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
A6: illegal packet processing, namely continuously emptying the cache data until the segmenter is read, and entering A8;
A7: processing idle packets and judging the types of packet head data; if the packet is the separator, exiting the unpacking flow, and entering A8; if the packet identifier is the idle packet identifier, the current state is maintained; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
A8: and after the analysis of the one-time divided packet is finished, exiting the unpacking flow, entering A1, and waiting for the next divided packet to be processed.
According to one embodiment of the invention, when the MPDU is acquired, the FPGA is adopted to process the input data in parallel, and the processing bit width is 8 or 16.
According to the embodiment of the invention, when the MPDU data packet is subjected to encapsulation packet analysis, the output rate of the encapsulation packet is adjusted by adjusting the proportion of encapsulation packet analysis and cache data reading, so that the high-speed unpacking processing of the MPDU is realized.
According to an embodiment of the present invention, the depth of the buffer is set to be multiple times of the maximum length of the package, and the data is read and written in a first-in first-out manner.
A parsing apparatus for multiplexing protocol data units based on a CCSDS specification, comprising: the MPDU processing device comprises a processing module, an MPDU segmentation control module, an encapsulation packet analysis control module, an output setting module and a cache;
the processing module adopts an FPGA to process the input MPDU data in parallel and transmits the MPDU data to the MPDU segmentation control module;
The MPDU segmentation control module is used for extracting the head pointers of the first two bytes of the current MPDU data packet, legitimacy judgment is carried out on the head pointers, if the head pointers are legal, the current MPDU data is counted, and when the head pointers point to preset positions in the data packet, data reception is started and the data is written into a cache; receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, performing validity judgment on the head pointers, if the head pointers are legal, continuing to receive data, and writing the data into a cache; if not, the packet divider is forcedly written, the packet count is +1, and the data is not received any more;
The package analysis control module is used for reading the data in the cache, judging the type of the package head data, and if the package head data is a segmenter, exiting unpacking; if the identifier is a legal identifier, reading the length information of the packaging packet, continuously outputting packaging packet data according to the length information, and inserting a corresponding waiting period according to the interval requirement of the packaging packet so as to analyze the next packaging packet;
The output setting module is used for adjusting the output rate of the encapsulation packet by adjusting the analysis and cache data reading ratio of the encapsulation packet so as to realize the high-speed unpacking processing of the MPDU.
By adopting the technical scheme, the invention has the following advantages and positive effects compared with the prior art:
According to the analysis method of the multiplexing protocol data unit based on the CCSDS specification, which is disclosed by the embodiment of the invention, the high-speed unpacking processing of the multiplexing protocol data unit is realized by adopting the modes of FPGA parallel processing and pipelining; and the package unpacking flow is divided into two flows of multiplexing protocol data unit segmentation and package analysis, so that the range of fault diffusion of multiplexing protocol data units and package is effectively limited, and the reliability requirements of fault isolation and fault self-recovery are met.
Drawings
FIG. 1 is a block diagram of a device for resolving a multiplexing protocol data unit based on CCSDS specifications according to an embodiment of the invention;
fig. 2 is a schematic diagram of a data format of an MPDU according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a format of an encapsulation packet according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a format of an encapsulated idle packet according to an embodiment of the present invention;
fig. 5 is a flowchart of MPDU fragmentation control according to an embodiment of the present invention;
fig. 6 is a flowchart illustrating control of package parsing according to an embodiment of the present invention.
Detailed Description
The following describes in further detail a method and apparatus for parsing a mux-pdu based on the CCSDS specification in accordance with the present invention, in conjunction with the accompanying drawings and the specific embodiments. Advantages and features of the invention will become more apparent from the following description and from the claims.
Referring to fig. 1, the present embodiment provides a parsing apparatus for multiplexing protocol data units based on CCSDS specifications, which implements high-speed parallel data processing by using an FPGA. The method specifically comprises the following steps: the MPDU processing device comprises a processing module 1, an output setting module 2, an MPDU segmentation control module 3, an encapsulation packet analysis control module 4 and a cache 5. The processing module 1 is used for completing the receiving and sending of data, the information interaction with the MPDU segmentation control module 3 and the encapsulation packet analysis control module 4 and the management of the cache 5. The output setting module 2 completes the rate setting of the output packet. The MPDU splitting control module 3 completes the header stripping of the multiplexed protocol data unit and the setting of the splitting line. The encapsulated packet parsing control module 4 completes the parsing of the encapsulated data packet. The buffer 5 is used for buffering the output data after the MPDU segmentation control module 4.
In the embodiment, the FPGA is selected from a Xilinx company RAM type FPGA, the model specification is XQ4VSX55-10FF1148M, the device has rich resources and is suitable for high-speed data processing, and the hardware support is provided for solving the problems of insufficient processing capacity, fault isolation, autonomous recovery and the like of multiplexing protocol data units of the existing aircraft products.
The processing module 1 performs high-speed parallel processing on the input data, and the bit width is generally set to 8 or 16. The process of unpacking the multiplexing protocol data unit is mainly divided into two processes of dividing the multiplexing protocol data unit and analyzing an encapsulation packet.
The multiplexing protocol data unit segmentation flow is realized by an MPDU segmentation control module 3, when MPDU data packets are segmented, the head pointers of the first two bytes of the current MPDU data packets are extracted, validity judgment is carried out on the head pointers, if the validity judgment is carried out on the head pointers, the current MPDU data are counted, and when the head pointers point to preset positions in the data packets, data receiving is started and the data are written into a cache; receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, performing validity judgment on the head pointers, if the head pointers are legal, continuing to receive data, and writing the data into a cache; if not, the packet splitter is forced to write, packet count +1, and no more data is received.
The encapsulated packet analysis flow is realized by an encapsulated packet analysis control module 4, when encapsulated packet analysis is carried out on MPDU data packets, data in a cache are read, the type of packet head data is judged, and if the packet head data is a segmenter, the packet is quitted; if the identifier is legal, reading the length information of the package, continuously outputting package data according to the length information, inserting a corresponding waiting period according to the interval requirement of the package, and then analyzing the next package.
The two processes are pipeline processing processes, and intermediate data generated by processing adopts buffer processing.
The output setting module 2 realizes the output of different rates by adjusting the proportion of the package analysis control module and the buffer data read-out. If the ratio is set to 1: and 3, the system clock is 100MHz, and the output rate of the package is 200Mbps.
The buffer 5 is used for storing both data and a segmenter, wherein the segmenter is a unique code. The data bit width is 8 bits, 1 bit high bit identification '0' is added as data, and 9 bits are added; the unique code is also 9 bits and can be set to 0x1FF.
In this embodiment, referring to fig. 2, the format of a multiplexed data unit (MPDU) includes an m_pdu header and an m_pdu Bao Yu, which is 872 bytes in length.
Referring to fig. 3, the encapsulation packet includes an encapsulation packet header and an encapsulation packet data field, and the maximum length of the encapsulation packet is 1284 bytes. The format of encapsulating the idle packets is shown in fig. 4.
The buffer memory is FIFO, the depth of the buffer memory is 3-4 times of the maximum length of the package, the buffer memory can be set to 4096 and the width is 9 bits, and the buffer memory is constructed by adopting RAM resources in the FPGA.
The following specifically describes the procedure of analyzing MPDU packets by the analyzing device for multiplexing protocol data units based on the CCSDS specifications:
1. MPDU packet fragmentation:
Multiplexing Protocol Data Unit (MPDU) fragmentation is implemented using a state machine, see fig. 5, comprising the steps of:
S1: and in an idle state, waiting for multiplexing protocol data unit input. And receiving the multiplexing protocol data unit, extracting the head pointer of the first two bytes, and judging the validity of the head pointer. The legitimacy interpretation standard is as follows: the length range of the head pointer is 0-MPDU data field length-1, and the other is illegal. In this embodiment, the MPDU data field length is set to 870, and the legal range of the head pointer is 0 to 869.
If not, not starting receiving and keeping an idle state S1; if the data is legal, the received data is counted, and when the head pointer points to the appointed position (such as 0-869) in the packet data, the receiving is started, and the S2 is entered.
S2: data is received and written into the cache. And judging whether the current multiplexing protocol data unit is ended or not, and if so, entering S3.
S3: and receiving the next packet multiplexing protocol data unit, extracting the head pointer of the first two bytes of the current packet, and judging the validity of the head pointer. Legal ranges for the head pointer are 0-869 and 8091, where 8091 indicates that there are no new CCSDS packets in the MPDU packet. If the data is legal, entering into S4, and continuing to receive the data; if not, the process proceeds to S5.
S4: data is received and written into the cache. Meanwhile, judging whether the current multiplexing protocol data unit is ended or not, and if so, entering S3; if the MPDU packet is not finished and the header pointer points to a specified position (0 to 869) in the packet data, then S6 is entered.
S5: the packet separator 0x1FF is forcedly written, the packet count +1, and the data is not received any more, and the process goes to S1 to wait for the next data reception task.
S6: the packet delimiter 0x1FF is forcedly written, the packet count +1, and the process proceeds to S2, where data reception is continued.
2. Package parsing
Package parsing is implemented by a state machine, please refer to fig. 6, which includes the following steps:
a1: and in an idle state, when more than one split packet is cached, entering A2, and starting a packet-unpacking flow.
A2: and reading the cache data and judging the type of the packet head data. If the partition is 0x1FF, exiting the unpacking flow and entering A1; if the packet identifier is the idle packet identifier 0xE0, entering A7; if the legal identifier is 0xEA, entering A3; the remainder are illegal identifiers, then A6 is entered.
A3: firstly, reading the length information of the package, wherein the length range of CCSDS is 3-1283 in the example, and if the length information is wrong, entering A6; and if the length information is correct, continuously outputting the package data according to the length information, and entering A4 after finishing.
A4: and inserting a corresponding waiting period according to the interval requirement of the packaging package.
A5: and reading the next package encapsulation package and judging the package head data type. If the partition is 0x1FF, exiting the unpacking flow and entering A8; if the packet identifier is the idle packet identifier 0xE0, entering A7; if the legal identifier is 0xEA, entering A3; the remainder are illegal identifiers, then A6 is entered.
A6: illegal packet processing continuously empties the cache data until the segmenter 0x1FF is read, and then A8 is entered.
A7: and processing idle packets and judging the packet head data type. If the partition is 0x1FF, exiting the unpacking flow and entering A8; if the idle packet identifier is 0xE0, the current state is maintained; if the identifier is an illegal identifier, entering A6; if the legal identifier is 0xEA, the process proceeds to A3.
A8: and after the analysis of the one-time divided packet is finished, exiting the unpacking flow, entering A1, and waiting for the next divided packet to be processed.
In summary, the parsing method of the multiplexing protocol data unit based on the CCSDS specifications in the present embodiment implements high-speed unpacking processing of the multiplexing protocol data unit by adopting parallel processing and pipelining. And the package unpacking flow is divided into two flows of multiplexing protocol data unit segmentation and package analysis, so that the fault diffusion range of the multiplexing protocol data unit and the package is effectively limited, and the reliability requirements of fault isolation and fault self-recovery are met.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is within the scope of the appended claims and their equivalents to fall within the scope of the invention.
Claims (7)
1. A method for parsing a multiplexing protocol data unit based on a CCSDS specification, comprising:
acquiring a multiplexing protocol data unit MPDU, dividing MPDU data packets and analyzing encapsulation packets;
wherein the splitting of the MPDU data packet includes:
Extracting the head pointers of the first two bytes of the current MPDU data packet, performing validity judgment on the head pointers, counting the current MPDU data if the head pointers are legal, and starting data receiving and writing into a cache when the head pointers point to preset positions in the data packet;
receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, performing validity judgment on the head pointers, if the head pointers are legal, continuing to receive data, and writing the data into a cache; if not, the packet divider is forcedly written, the packet count is +1, and the data is not received any more;
the encapsulating packet parsing of the MPDU data packet comprises:
reading the data in the cache, judging the type of the packet head data, and if the packet head data is a segmenter, exiting unpacking; if the identifier is legal, reading the length information of the package, continuously outputting package data according to the length information, and inserting a corresponding waiting period according to the interval requirement of the package so as to analyze the next package.
2. The method for parsing a multiplexing protocol data unit based on the CCSDS specification according to claim 1, wherein the fragmentation control of the MPDU data packet is implemented by using a state machine:
S1: an idle state, waiting for MPDU data packet input; after receiving the MPDU data packet, extracting the head pointers of the first two bytes of the current MPDU data packet, and judging the legality of the head pointers; if not, not starting receiving and keeping an idle state S1; if the data is legal, the received data is counted, and when the head pointer points to the appointed position in the packet data, the receiving is started, and S2 is entered;
S2: receiving data and writing the data into a cache; judging whether the current MPDU data packet is finished or not at the same time, and if so, entering S3;
S3: receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, and judging the legality of the head pointers; if the data is legal, entering into S4, and continuing to receive the data; if not, entering S5;
S4: receiving data and writing the data into a cache; judging whether the current MPDU data packet is finished or not at the same time, and if so, entering S3; if not, and when the leading pointer points to the appointed position in the packet data, entering S6;
S5: the packet separator is forcedly written, the packet count is +1, and the data is no longer received, and then S1 is entered, waiting for the next data reception task.
S6: the packet separator is forcedly written, packet count +1, and then S2 is entered, and data reception is continued.
3. The method for parsing a multiplexing protocol data unit based on the CCSDS specification according to claim 1, wherein the encapsulated packet parsing control for MPDU data is implemented using a state machine:
a1: in an idle state, when more than one split packet is cached, entering into A2, and starting a packet unpacking process;
A2: reading cache data and judging the type of packet head data; if the packet is the separator, exiting the unpacking flow, and entering A1; if the packet identifier is the idle packet identifier, entering A7; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
a3: firstly, reading the length information of the package, and if the length information is wrong, entering A6; if the length information is correct, continuously outputting package data according to the length information, and entering A4 after finishing;
A4: inserting a corresponding waiting period according to the interval requirement of the packaging package;
A5: reading the next package and judging the package head data type; if the packet is the separator, exiting the unpacking flow, and entering A8; if the packet identifier is the idle packet identifier, entering A7; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
A6: illegal packet processing, namely continuously emptying the cache data until the segmenter is read, and entering A8;
A7: processing idle packets and judging the types of packet head data; if the packet is the separator, exiting the unpacking flow, and entering A8; if the packet identifier is the idle packet identifier, the current state is maintained; if the identifier is an illegal identifier, entering A6; if the identifier is a legal identifier, entering A3;
A8: and after the analysis of the one-time divided packet is finished, exiting the unpacking flow, entering A1, and waiting for the next divided packet to be processed.
4. The method for analyzing a multiplexed protocol data unit according to the CCSDS specification according to claim 1, wherein the input data is processed in parallel by using an FPGA when acquiring the MPDU of the multiplexed protocol data unit, and the processing bit width is 8 or 16.
5. The method for analyzing a multiplexing protocol data unit based on the CCSDS specification according to claim 1, wherein when the MPDU data packet is subjected to encapsulated packet analysis, the output rate of the encapsulated packet is adjusted by adjusting the ratio of encapsulated packet analysis to buffered data reading, so as to implement high-speed decapsulation processing of the MPDU.
6. The parsing method of multiplexing protocol data unit based on CCSDS specification as claimed in claim 1, wherein the depth of the buffer memory is set to be multiple times of the maximum length of the encapsulation packet, and the data reading and writing is performed in a first-in first-out manner.
7. A device for parsing a multiplexed protocol data unit based on a CCSDS specification, comprising: the MPDU processing device comprises a processing module, an MPDU segmentation control module, an encapsulation packet analysis control module, an output setting module and a cache;
the processing module adopts an FPGA to process the input MPDU data in parallel and transmits the MPDU data to the MPDU segmentation control module;
The MPDU segmentation control module is used for extracting the head pointers of the first two bytes of the current MPDU data packet, legitimacy judgment is carried out on the head pointers, if the head pointers are legal, the current MPDU data is counted, and when the head pointers point to preset positions in the data packet, data reception is started and the data is written into a cache; receiving the next MPDU data packet, extracting the head pointers of the first two bytes of the MPDU data packet, performing validity judgment on the head pointers, if the head pointers are legal, continuing to receive data, and writing the data into a cache; if not, the packet divider is forcedly written, the packet count is +1, and the data is not received any more;
The package analysis control module is used for reading the data in the cache, judging the type of the package head data, and if the package head data is a segmenter, exiting unpacking; if the identifier is a legal identifier, reading the length information of the packaging packet, continuously outputting packaging packet data according to the length information, and inserting a corresponding waiting period according to the interval requirement of the packaging packet so as to analyze the next packaging packet;
The output setting module is used for adjusting the output rate of the encapsulation packet by adjusting the analysis and cache data reading ratio of the encapsulation packet so as to realize the high-speed unpacking processing of the MPDU.
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