CN116647490A - Aviation AFDX network data detection system - Google Patents
Aviation AFDX network data detection system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
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- H04L12/40—Bus networks
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- H—ELECTRICITY
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/02—Standardisation; Integration
- H04L41/0213—Standardised network management protocols, e.g. simple network management protocol [SNMP]
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- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
- H04L41/064—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis involving time analysis
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- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an aviation AFDX network signal detection system, which comprises hardware and software, wherein the hardware consists of a computer and an AFDX interface card, the software consists of on-line loading and unloading software based on ARINC615A protocol and on-line monitoring and playback analysis software of AFDX network respectively, the on-line loading and unloading software based on ARINC615A protocol consists of two parts of a management end and a client end, a user realizes the on-line loading and unloading functions of a plurality of target end software on a management software interface, and the on-line monitoring and playback analysis software of the AFDX network can be divided into an AFDX frame processing module, an ICD analysis module, a fault scanning module and a data playback module.
Description
Technical Field
The invention relates to an aviation network data bus detection technology, in particular to an aviation AFDX network data detection system designed for realizing on-line loading/unloading, monitoring, analysis and playback functions of AFDX network data.
Background
The AFDX bus protocol is firstly examined and passed by the avionics committee and is based on the IEEE802.3 standard and commercial COTS technology, is firstly applied to A380 and A400M, is a novel bus in the current avionics system bus type products, and is a deterministic aircraft data network bus system suitable for avionics system information transmission. Compared with the existing bus signals of aviation ARINC429 and MIL-STD-1553, the AFDX network has the advantages of high transmission speed, high reliability, high anti-interference capability and the like, the commercial Ethernet is successfully introduced into the aviation field by the AFDX network until the official standard is published in 2002, and the AFDX network system with advanced technology and high data throughput is adopted by the increasingly-paired comprehensive avionics system, so that the research on the AFDX network detection technology is very important.
At present, a plurality of avionics product signal control and state readback systems on an aircraft are judged and controlled by receiving or transmitting an AFDX network bus. When a new model of avionics system using the AFDX network is developed, or a newly modified avionics product is used, or laboratory tests and fault diagnoses are performed on existing models and avionics products, production delivery is often affected because no corresponding detection means exist. It is therefore necessary to design an AFDX network data detection system that can be adapted to avionics products.
In the prior art, most of AFDX network data detection systems on the market and in traditional laboratory experiments have the following problems, 1) most of AFDX network data detection systems cannot realize the online data loading/unloading function, and especially when the data quantity is large for a plurality of devices, loading data errors often occur, so that the devices are updated and maintained in a traditional unpacking and uncovering mode, and the test efficiency is greatly reduced. 2) Real-time monitoring, analysis and playback display of the AFDX network as the avionics system backbone network cannot be realized, and the system does not have the detection capability of supporting various search conditions to query parameter information and fast fault data in large data.
Based on the above problems, there is an urgent need for an AFDX network data detection system with multiple functions, high performance and high integration level in the normal product testing, production delivering and aircraft troubleshooting processes, which can perform on-line loading/unloading of equipment data, and realize functions of network data acquisition, analysis, playback and retrieval, thereby completing the requirement of equipment function inspection.
Disclosure of Invention
An aviation AFDX network data detection system mainly comprises hardware and software, wherein the hardware mainly comprises a portable reinforcement computer, an AFDX interface card and a SATA disk card reader, the AFDX interface card is an intelligent PCI module, and hardware support of monitoring, analyzing, loading and playback functions of an AFDX network bus is provided; the SATA disk card reader is connected by USB, and can access memory cards with various formats; the software comprises two parts, namely on-line loading/unloading software based on ARINC615A protocol and on-line monitoring analysis playback software of AFDX network. The on-line loading/unloading software based on ARINC615A protocol consists of a management end and a client end, wherein the management end operates on an AFDX network data detection system, the client end operates on a target machine end, and a user realizes on-line loading/unloading functions of a plurality of target end software through an interface of the management software; the AFDX network online monitoring analysis playback software can be divided into an AFDX frame processing module, an ICD analysis module, a fault scanning module and a data playback module according to functions, wherein the AFDX frame processing module analyzes an AFDX data frame structure, the ICD analysis module is the core of ground processing software and mainly realizes analysis and display of AFDX bus data, the fault scanning module is used for meeting the requirement of troubleshooting personnel for quickly browsing fault information, an XML-based fault information description file is designed, and the data playback module reads and plays back the AFDX network data in a database mode.
The on-line loading/unloading system of ARINC615A protocol divides software into 5 layers, an application layer, an ARINC615A protocol layer, a TFTP layer, an AFDX driving layer and a MAC layer according to functions, wherein the application layer comprises a loading end application and a target end application, the loading end application operates in loading equipment, the target end application operates in target equipment, the two applications are initiated by an upper layer user, and the user is realized by calling the ARINC615A protocol layer; the ARINC615A protocol layer comprises a loading end protocol and a target end protocol, the loading end protocol actively initiates an operation instruction by sending a request to the target end, and the target end protocol passively waits for the request and executes response operation according to different request packets; the TFTP layer realizes the sending and receiving functions of file data, ensures the correctness of the file transmission process through a mechanism of reading and writing requests and ACK responses, and uses an AFDX driving layer interface based on UDP protocol; the AFDX driving layer realizes an SAP port communication function based on ARINC615A protocol, comprises IP, UDP and SAP protocols, the IP layer provides a connectionless data packet transmission mechanism to realize the IP encapsulation and fragmentation functions of data, the UDP protocol is established on the IP protocol to provide connectionless data packet transmission to realize the data communication of different processes with the same IP address, the SAP port mechanism realizes a service access function based on ARINC 664P 7 protocol, and can realize the receiving and sending of AFDX standard data frames through the SAP port; the MAC layer implements functions of virtual link management, namely VL management and redundancy management, specified by the ARINC 664P 7 protocol, which are implemented by hardware.
The AFDX frame processing module is used for analyzing an AFDX data frame structure, wherein the AFDX frame structure consists of an MAC header, an IP header, a UDP header, an AFDX load, an SN, an FCS, an error category, input/output, a port, a timestamp and an FCS.
The ICD analysis module is the core of ground processing software, and realizes analysis and display of AFDX bus data. The module is mainly divided into a preprocessing module and an analysis module.
The preprocessing module can distribute original finished data of a high-speed signal converted by a low-speed signal of the distributed collector in a plurality of AFDX frames, can not decode when a complete data packet is not received, and establishes buffer queues for ports and block numbers respectively to circularly process the buffer queue data to be combined into complete original data capable of decoding.
The analysis module defines a data block number by an ICD data block, only information such as an IP address, a virtual link number, a UDP port and the like in an AFDX network data frame, identifies a specific data block number by establishing a mapping table, automatically analyzes according to logic meanings according to the data block number and the ICD definition, such as information such as a data type, a data length, a start bit, an end bit, a sign bit, a status bit, a minimum value, a maximum value, a resolution and the like, and supports visual display of analysis results in a tree structure and a table mode.
The fault scanning module is an XML-based fault information description file designed for meeting the requirement of quick fault information browsing by troubleshooting personnel, and the file field structure comprises: the method comprises the steps of carrying out scanning judgment analysis on original AFDX network data one by a fault scanning module when carrying out online real-time monitoring or playing back fast access data, and generating a graphically displayed fault list.
The data playback module adopts a Sqlite3 database to carry out data playback, the data playback files are divided into DB data files and quick-access data files, the DB data files are mainly recorded data files stored during online monitoring, the DB data files can be directly read and played back through a Sqlite3 database program interface, the quick-access data files are firstly read and converted into DB data files, then the DB data files are played back in a Sqlite3 database mode, the data playback display mode comprises a tree structure, a table and a curve, and the data playback display mode supports filtration display under various combined search conditions including start-stop time, data block numbers, parameter names, communication ports, IP addresses, virtual link numbers, UDP ports and packet lengths.
The invention has the beneficial effects that:
1) The invention constructs a data loading/unloading system based on AFDX network protocol and ARINC615A protocol, which can upgrade a plurality of modules in a plurality of devices and a device at a time in batches, provides a query/response mode, adopts a plurality of safety protection mechanisms such as a backup mechanism, an ACK response, a CRC check and the like, supports a plurality of search conditions to query parameter information in a large data volume, realizes large-capacity data detection, and greatly improves test efficiency and verification of outfield technology change.
2) The invention designs an on-line monitoring analysis playback system based on five functional modules of AFDX frame processing, ICD analysis, fault scanning detection and data playback, the system can monitor all network data by configuring a VL/port monitoring strategy, monitors AFDX bus data among avionics systems, analyzes the network data according to an AFDX protocol and a specific ICD file, realizes port/VL-based network monitoring and data decoding, directly reads and plays back stored record data files by adopting a Sqlite3 database program interface, and can perform data retrieval by methods of system time, data specification number, data source/destination and the like during data playback, thereby improving the research and judgment capability of the network data of an aircraft system.
3) The invention provides a network configuration method based on XML, which adopts a static routing mode to endow a message with a layer-to-layer peer-to-peer communication identification mode in each frame, designs an XML-based fault information description file, and comprises a fault name, a fault threshold value, a real-time monitoring value, a fault criterion, a fault occurrence time, a fault duration time, a fault ending time, a fault occurrence times, a fault data block number and an AFDX frame number, realizes scanning, judging and analyzing original AFDX network data one by one, and generates a graphically displayed fault list. The system has the capability of flight data fault information scanning and rapid fault data positioning.
4) The invention defines message operation according to the SNMPVZ protocol adopted by the AFDX network, and sends a request to the proxy process by one of two communication modes, and inquires a specific parameter value. Another way is for the proxy process to actively report to the management process that some significant event has occurred. And the AFDX network data management is realized, and the safety and reliability of the data in transmission are ensured.
Drawings
FIG. 1 is a data on-line load/unload system protocol architecture based on ARINC615A protocol
FIG. 2AFDX network data on-line monitoring analysis playback system function architecture
Detailed Description
Taking a certain type of machine as an example, the invention provides an AFDX network data detection system, which is used for realizing comprehensive detection based on AFDX network data, and specifically comprises hardware and software, wherein the hardware mainly comprises a portable reinforcement computer, an AFDX interface card and a SATA disk card reader, the portable reinforcement computer adopts CPU with more than six cores of Intel cool i5/i7, and has four types of interfaces of GJB289A, AFDX, ethernet and USB3.0, and is used for providing hardware support for the functions of system bus data acquisition, analysis, storage, playback, retrieval and the like; the AFDX interface card is an intelligent PCI module which is embedded in a computer and can realize the functions of simulation, test, monitoring, analysis and the like of an AFDX bus; the SATA disk card reader is connected with a computer through a USB, and can access memory cards in various formats according to the ISO7816 interface standard, so that the data reading requirement is met.
The AFDX network data detection system software is divided into two types, wherein one type is data online loading/unloading software based on ARINC615A protocol, and the other type is AFDX network online monitoring analysis playback system software. The ARINC615A protocol data online loading/unloading software is mainly used for realizing the online software upgrading capability based on AFDX network data, and can be simultaneously upgraded for a plurality of devices and a plurality of module software in one device at a time. Dividing software into 5 layers according to functions, namely an application layer, an ARINC615A protocol layer, a TFTP layer, an AFDX driving layer and a MAC layer, wherein the application layer comprises a loading end application and a target end application, the loading end application operates in an AFDX network data detection system, the target end application operates in target equipment, the two applications are initiated by an upper user, and the user realizes related functions by calling the ARINC615A protocol layer; the ARINC615A protocol layer comprises a loading end protocol and a target end protocol, the loading end protocol actively initiates an operation instruction by sending a request to the target end, and the target end protocol passively waits for the request and executes response operation according to different request packets. The TFTP protocol layer is used for realizing the sending and receiving functions of file data in the using process, ensuring the correctness of the file transmission process through a mechanism of reading and writing requests and ACK responses, and conveniently using an AFDX driving layer interface based on UDP protocol to facilitate the online transmission of the AFDX network data; the AFDX driving layer comprises IP, UDP and SAP protocols, and can realize SAP port communication function based on ARINC615A protocol. The IP layer can provide a connectionless data packet transmission mechanism, can realize the IP encapsulation and fragmentation functions of data, and the UDP protocol is established on the IP protocol to provide connectionless data packet transmission, thereby ensuring the data communication of different processes with the same IP address. The SAP port mechanism realizes the service access function based on ARINC 664P 7 protocol, and can realize the receiving and sending of AFDX standard data frames through the SAP port; the MAC layer is mainly used for realizing virtual link management specified by ARINC 664P 7 protocol, namely VL management and redundancy management, and acquiring electrical signals in real time by utilizing a hardware resource board and converting the electrical signals into digital signals of a standard electrical protocol; the portal collects and transmits electrical signals via a standard network electrical format.
The specific implementation method for on-line data loading/unloading based on ARINC615A protocol is as follows: 1) FIND operation: the loading end sends a FIND request packet to the target machine, and the target machine informs the parameter information of the current target machine, such as a target machine hardware equipment identifier, a target machine hardware name, a target machine hardware position and a target machine manufacturer code, by responding the FIND response packet to the loading end; 2) Information operation: the loading end sends an information operation request packet to the target machine, and the target machine informs the current equipment information of the loading end, such as the current running version, the updated version, the component description, the modification description and the like of the target machine software component by transmitting an information operation list protocol file to the loading end; 3) Uploading operation: the loading end sends an uploading/unloading operation request packet to the target machine, and the target machine sequentially acquires data files from the loading end according to the data files defined in the uploading list by acquiring an uploading/unloading request protocol file uploading file list of the loading end, so that the purpose of acquiring uploading/unloading files is finally achieved; 4) And (5) downloading by a user: the loading end sends an operator defined downloading request packet to the target machine, the target machine sends a local file list to the loading end after receiving the request, the loading end selects a required data file from the file list, and finally the loading end assembles a downloading file list and sends the downloading file list to the target machine, and the target machine sends the file selected by the loading end to the loading end according to the file list.
Taking the network data of a target machine of a certain type of machine as an example, firstly connecting a matched cable between a loading management end and a target client end and powering up, opening an AFDX network data detection system, running data of an ARINC615A protocol, online loading/unloading software, clicking a connection key at the rear of the target client end to carry out network connection, clicking and determining in connection setting, at the moment, the loading management end can send a FIND request packet to the target client end and inform parameter information of the current target machine, then opening an information operation key at the left upper corner of the software, clicking an import loading/unloading file, at the moment, inputting a software version number of the current loading/unloading in an import loading/unloading file box, clicking a next step, opening a file directory to be imported/unloading, copying the file into a corresponding folder, closing a folder window, clicking a 'completed file copy' key, at the moment, and after the target machine informs the current equipment information of the loading end through an information operation list protocol file, clicking an uploading operation protocol, the target machine can obtain an uploading file uploading/unloading request file of the loading end, and finally, the target machine can simply and conveniently detach the file from the loading/unloading box after the traditional file is obtained according to the definition of the upgrading file of the upper end, and the situation that the loading/unloading file is not completed.
The AFDX network online monitoring analysis playback system software can be divided into an AFDX frame processing module, an ICD analysis module, a fault scanning module and a data playback module according to functions. The invention designs the AFDX frame processing module according to the AFDX data frame structure, which mainly analyzes the AFDX data frame structure, wherein the AFDX frame structure consists of an MAC header, an IP header, a UDP header, an AFDX load, an SN, an FCS, an error category, an input/output, a port, a time stamp and an FCS; the MAC header is composed of a source address, a destination address and a type field, each address is 48 bits, the destination address can identify a virtual chain, the source address is a unicast address, and the destination address is a multicast address; the IP header comprises a source address and a destination address, the IP source address is unicast, and the sender is identified; the IP destination address is unicast, identifying the destination user or a multicast address; the UDP header comprises a UDP destination port and a source port, and the UDP packet length; the AFDX payload is for user-defined data; sequence number, start value 0, cycle between 1 and 255; FCS: a frame check code; error category: describing whether an AFDX frame has an error; input/output: describe that an AFDX frame is an input frame or an output frame; the port: describing from which port the AFDX frame is forwarded; timestamp: the RTC clock describing AFDX frames; the ICD analysis module is a core of data analysis processing and mainly realizes analysis and display of AFDX bus data. The module is mainly divided into a preprocessing module and an analysis module. 1) The preprocessing module can distribute original finished data of a high-speed signal converted by a low-speed signal of the distributed collector in a plurality of AFDX frames, can not decode when a complete data packet is not received, and establishes buffer queues for ports and block numbers respectively to circularly process the buffer queue data to be combined into complete original data capable of decoding. 2) The analysis module defines a data block number by an ICD data block, only information such as an IP address, a virtual link number, a UDP port and the like is included in an AFDX network data frame, a specific data block number is identified by establishing a mapping table, and according to the data block number and ICD definition, the system can automatically analyze according to logic meanings according to information such as a data type, a data length, a start bit, an end bit, a sign bit, a status bit, a minimum value, a maximum value, a resolution and the like, and the analysis result is intuitively displayed in a tree structure and a table mode. The fault scanning module mainly aims at meeting the requirement of troubleshooting personnel for quickly browsing fault information, and designs an XML-based fault information description file, wherein the file field structure comprises: the invention has the capabilities of flight data fault information scanning and rapid fault data positioning when on-line real-time monitoring or playing back the fast access data. The data playback module is mainly used for solving the problem that the AFDX bus network data of the airplane cannot be played back and analyzed in real time, and because the AFDX network data size is large, the recorded AFDX data size of the airplane onboard equipment can reach tens of GB, the data cannot be directly and completely loaded into a memory for playback and analysis, and the data format is mostly in a binary text form, so that the data retrieval is very difficult. The invention utilizes the lightweight embedded database Sqlite3 based on the file with an open source, which occupies very low resources and supports mainstream operating systems such as Window, linux and the like. Meanwhile, interfaces can be provided for a plurality of programming languages such as C++, java and the like, the data searching efficiency is high, and Chinese characters are supported. The data playback files are mainly divided into DB data files and cache data files. The DB data file is mainly a recorded data file stored during online monitoring, and can be directly read and played back through a Sqlite3 database program interface. The fast-access data file is a binary file and cannot be read and played back directly, so that the fast-access data file needs to be read and converted into a DB data file at first and then played back in the form of a Sqlite3 database. The display form of the data playback comprises a tree structure, a table, a curve and other modes, and supports the input of various combined search conditions including start and stop time, data block numbers, parameter names, communication ports, IP addresses, virtual link numbers, UDP ports, packet lengths and the like for filtering display.
Taking monitoring analysis playback of AFDX network data of a certain machine as an example, connecting a computer AFDX monitoring interface cable, opening an AFDX network data detection system, running AFDX network data monitoring analysis playback software, selecting target equipment to be monitored, clicking a 'start monitoring' button in a toolbar, selecting a parameter button, selecting a data parameter to be monitored, clicking to determine to start monitoring, at the moment, an AFDX frame processing module in system software can perform structural analysis on the monitored data, judge whether transmitted AFDX frame data is correct or not, display the data in a monitoring analysis interface, monitor and display information such as data dispersion quantity and position information in real time, when the monitored AFDX data is correct in format, perform preprocessing and analysis processing through the analysis module, respectively establish a buffer queue and data decoding into complete original data through a data port and a block number, identify a specific data block number through the analysis module, and define according to the data block number and definition through a mapping table, and the data type, a start bit, an end bit, a minimum symbol bit, a state bit, a maximum value, and the like, can realize analysis of the data in the form of the monitoring analysis of the monitored network data in the monitoring analysis interface, and display the network analysis information in the form, and display the visual analysis result in the form of the monitoring analysis information, and display of the network analysis information in the monitoring analysis information, and the network analysis information. When the monitored and analyzed AFDX data has errors, a fault list option is opened at the moment, the fault scanning module can present the error data in an XML fault information description file, wherein the fault information description file comprises a fault name, a fault threshold value, a real-time monitoring value, a fault criterion, a fault occurrence time, a fault duration time, a fault ending time, a fault occurrence number, a fault data block number and an AFDX frame number, so that a tester can conveniently and rapidly perform fault positioning, and meanwhile, in a data query option, target parameter information can be rapidly queried in large-capacity data by inputting information such as a data message format or a data storage position. When the data playback operation is executed, the data is switched to the data file and the cached data file is selected by clicking the toolbar open data icon, at this time, the data playback module in the system software automatically converts the data into the NET format, after the conversion is completed, the cached data can be checked according to the data in the playback DB format, then the database file (DB) is switched to the open format by clicking the toolbar open data icon, and the online monitoring stored DB file or the cached converted DB file is selected, so that the played back file can be opened to read the played back data. By clicking the toolbar "select parameters" button, the parameters that need to be viewed can be selected. And finally, moving the mouse to a curve window, automatically displaying a cross marking line, and along with the movement of the mouse marking line, automatically displaying a corresponding parameter value at the marking line on the right data parameter window, thereby finally realizing the online playback function under the AFDX network data.
The invention is successfully applied to the detection of the data of the avionics AFDX network of a certain type, realizes the functions of on-line loading/unloading, on-line monitoring, analysis, playback and the like based on the AFDX network data, avoids various inconveniences of traditional unpacking and uncapping, has simple upgrading operation, supports various search conditions to inquire parameter information in a large data volume, realizes the network monitoring and data decoding based on port/VL, has the detection capability of rapid fault data positioning, greatly improves the test efficiency of the AFDX network, ensures the quality of the aircraft installation, and has stronger economic benefit and practical value.
Claims (8)
1. The utility model provides an aviation AFDX network signal detecting system, which comprises hardware and software, characterized in that the hardware comprises computer and AFDX interface card, AFDX interface card is an intelligent PCI module, provide the monitoring of AFDX network signal, analyze, load, playback function's hardware support, the software contains two parts, respectively by ARINC615A protocol-based on-line loading and unloading software and AFDX network on-line monitoring playback analysis software, ARINC615A protocol-based on-line loading and unloading software constitute by management end and client, the management end operates on the computer that contains AFDX interface card, the client operates on the target machine end, the user is through realizing a plurality of target end software on-line loading and unloading functions at the management software interface, AFDX network on-line monitoring playback analysis software can divide into AFDX frame processing module, ICD analysis module, fault scanning module, data playback module, the on-line monitoring playback analysis software of AFDX data frame structure, ICD module is the core of ground processing software, mainly realize AFDX bus and display fault analysis data is the analysis module is the analysis of the AFDX data frame structure according to the function, the real-time information is realized, the analysis of fault analysis module is the fault is realized, the fault is the analysis information is realized is based on the XML is fast is realized, the fault is read and the analysis information is fast is realized.
2. The system of claim 1, wherein the on-line loading and unloading software of the ARINC615A protocol is divided into 5 layers, an application layer, an ARINC615A protocol layer, a TFTP layer, a UDP protocol layer, an AFDX driving layer and a MAC layer, the application layer comprises a loading end application and a target end application, the loading end application is operated in the loading device, the target end application is operated in the target device, the two applications are initiated by an upper layer user, and the user is realized by calling the ARINC615A protocol layer; the ARINC615A protocol layer comprises a loading end protocol and a target end protocol, the loading end protocol actively initiates an operation instruction by sending a request to the target end, and the target end protocol passively waits for the request and executes response operation according to different request packets; the TFTP layer realizes the sending and receiving functions of file data, ensures the correctness of the file transmission process through a mechanism of reading and writing requests and ACK responses, and uses an AFDX driving layer interface based on UDP protocol; the AFDX driving layer realizes an SAP port communication function based on ARINC615A protocol, comprises IP, UDP and SAP protocols, the IP layer provides a connectionless data packet transmission mechanism to realize the IP encapsulation and fragmentation functions of data, the UDP protocol is established on the IP protocol to provide connectionless data packet transmission to realize the data communication of different processes with the same IP address, the SAP port mechanism realizes a service access function based on ARINC 664P 7 protocol, the receiving and sending of AFDX standard data frames can be realized through the SAP port, and the MAC layer realizes the functions of virtual link management, namely VL management and redundancy management specified by the ARINC 664P 7 protocol, which are realized by an AFDX interface card.
3. The system of claim 1 wherein the AFDX frame structure is comprised of a MAC header, an IP header, a UDP header, an AFDX payload, SN, FCS, error categories, input/output, ports, time stamps, and FCS.
4. The system of claim 1 wherein the ICD parsing module is a core of ground processing software for implementing parsing and displaying of AFDX bus data. The module is mainly divided into a preprocessing module and an analysis module.
5. The system of claim 4 wherein the preprocessing module is configured to distribute the original completion data of the high-speed signal converted by the low-speed signal of the distributed collector in a plurality of AFDX frames, and when a complete data packet is not received, the preprocessing module is configured to respectively establish a buffer queue for the port and the block number, and to circularly process the buffer queue data to form complete original data capable of being decoded.
6. The system of claim 4, wherein the parsing module defines a data block number by an ICD data block, only includes information such as an IP address, a virtual link number, a UDP port, etc. in an AFDX network data frame, identifies a specific data block number by establishing a mapping table, and automatically parses the data block number according to the data block number and the ICD definition, such as a data type, a data length, a start bit, an end bit, a sign bit, a status bit, a minimum value, a maximum value, a resolution, etc., and supports visual display of a parsing result in a tree structure and a table manner.
7. The system of claim 1, wherein the fault scanning module is an XML-based fault information description file designed to meet the requirement of troubleshooting personnel to quickly browse fault information, and the file field structure comprises: the method comprises the steps of carrying out scanning judgment analysis on original AFDX network data one by a fault scanning module when carrying out online real-time monitoring or playing back fast access data, and generating a graphically displayed fault list.
8. The system of claim 1, wherein the data playback module is divided into two types, DB data files and cache data files, the DB data files are mainly recorded data files stored during online monitoring, the DB data files can be directly read and played back through a Sqlite3 database program interface, the cache data files are read and converted into DB data files, and then played back in the form of a Sqlite3 database, the display form of the data playback includes tree structures, tables and curves, and supports filtration display under various combined search conditions including start-stop time, data block numbers, parameter names, communication ports, IP addresses, virtual link numbers, UDP ports, and packet lengths.
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| CN117376442A (en) * | 2023-12-07 | 2024-01-09 | 中国民航大学 | Remote data concentrator protocol conversion method and equipment based on hardware processing architecture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117376442A (en) * | 2023-12-07 | 2024-01-09 | 中国民航大学 | Remote data concentrator protocol conversion method and equipment based on hardware processing architecture |
| CN117376442B (en) * | 2023-12-07 | 2024-03-08 | 中国民航大学 | Remote data concentrator protocol conversion method and equipment based on hardware processing architecture |
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