CN114006850A - Portable avionics bus test system and internal data transmission method - Google Patents
Portable avionics bus test system and internal data transmission method Download PDFInfo
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- H—ELECTRICITY
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- H04L43/00—Arrangements for monitoring or testing data switching networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to the technical field of airplane development and discloses a portable avionics bus test system and an internal data transmission method, wherein the system comprises a portable simulation test terminal, a wireless routing subsystem and a mobile terminal subsystem; the wireless routing subsystem is a hardware system of an airplane ground test wireless network formed by mutually wirelessly connecting at least two wireless routers (21), and is in data transmission connection with a mobile terminal subsystem; at least one portable simulation test terminal is in data transmission connection with the wireless routing subsystem, and is thus in data transmission connection with the mobile terminal subsystem; the portable simulation test terminal collects and sends airplane avionic bus data, and the mobile terminal subsystem receives and feeds back the distributed bus data and carries out graphical display and control. The invention has strong universality and convenient and quick use, improves the test coverage rate, and leads the final assembly debugging and the onboard ground test to be more sufficient, thereby improving the confidence coefficient of the test result.
Description
Technical Field
The invention relates to the field of aircraft development, in particular to a portable avionics bus test system and an internal data transmission method.
Background
With the rapid development of the avionics system of the airplane, the functional performance of the airplane is greatly improved, the safety, the economy and the comfort are also greatly improved, but the complexity of the avionics system is higher and higher, and the avionics system is particularly embodied in the aspect of a bus network of the avionics system.
At the stage of airplane general assembly and ground debugging, the airplane system needs to be tested on the airplane as fully as possible, the existing ground testing equipment is dispersed, interaction information of the system cannot be formed, bus monitoring is difficult to share avionic bus data with station positions of excitation sensors, more manpower is invested mainly in a distributed mode to carry out interphone communication, so that more personnel and corresponding guarantee facilities are invested, accurate data exchange and state confirmation cannot be achieved, and meanwhile efficiency is low. In order to solve the problem, data communication schemes based on wireless ethernet have been proposed in the industry to integrate ground test equipment, but the data communication schemes cannot be realized due to insufficient network coverage, and meanwhile, the reliability and real-time performance of common ethernet communication cannot be guaranteed.
Disclosure of Invention
In order to solve the problems, the invention provides a portable avionic bus test system and an internal data transmission method, which can solve the problems of distributed application, accurate data exchange and state confirmation of avionic bus monitoring and testing in the final assembly and ground debugging stages of an airplane, reduce the labor time cost and improve the working efficiency. Meanwhile, the system solves the problems of real-time performance and reliability of the avionics bus test system based on wireless network communication.
The technical scheme of the invention is as follows:
a portable avionics bus test system comprises a portable simulation test terminal, a wireless routing subsystem and a mobile terminal subsystem; the wireless routing subsystem is a hardware system of an airplane ground test wireless network formed by mutually wirelessly connecting at least two wireless routers (21), and is in data transmission connection with a mobile terminal subsystem; at least one portable simulation test terminal is in data transmission connection with the wireless routing subsystem, and is thus in data transmission connection with the mobile terminal subsystem; the portable simulation test terminal collects and sends airplane avionic bus data, and the mobile terminal subsystem receives and feeds back the distributed bus data and carries out graphical display and control.
Further, the portable simulation test terminal comprises a display control module, a data processing module, an ICD database module, a 429 bus transceiver module, an AFDX bus transceiver module and a wireless Ethernet transceiver module; the display control module is connected with the data processing module in a communication-enabled mode and completes acquisition of avionic bus data, display of simulation data, control of a simulation model and display mode switching, the data processing module is respectively connected with the display control module, the ICD database module, the 429 bus transceiving module, the AFDX bus transceiving module and the wireless Ethernet transceiving module in a communication-enabled mode to complete interface definition reading, avionic parameter data analysis, package of simulation bus data, package of wireless network data and wireless network data receiving functions, the 429 bus transceiving module completes acquisition and sending of 429 bus data, the AFDX bus transceiving module completes acquisition and sending of AFDX bus data, and the wireless Ethernet transceiving module completes distribution of avionic bus data and communication state feedback of a receiving wireless terminal subsystem.
Furthermore, all wireless routers of the wireless routing subsystem are connected through a network, and distributed wireless communication points of each station of the airplane are completely covered by continuous coverage of wireless Ethernet signals.
An internal data transmission method of a portable avionics bus test system is characterized in that avionics bus data transmission and control data transmission of a portable simulation test terminal and a mobile terminal subsystem are realized by adopting a mechanism with check and feedback to ensure real-time performance and reliability of communication.
Further, the method specifically comprises the following steps:
the periodic avionics data and the event data are transmitted based on a UDP protocol, the starting position of a data segment contains a 4-byte starting mark, 4-byte time stamp data is transmitted, a 4-byte data frame sequence is transmitted, a 1-byte data type is transmitted to represent the periodic data or the event data, 1 byte is transmitted to represent the period length, data with the length not more than 1000 bytes is transmitted, a 4-byte checksum is transmitted, and finally a frame detection sequence of a UDP protocol data packet is transmitted.
Further, the data checksum method comprises the following steps: the accumulation is calculated by 32 bit words from the time stamp data, and the 32 bit words are complemented:
where SUM is the checksum, MOD stands for remainder, val (i) is the ith 32-bit word value, and n denotes the number of 32-bit words from the timestamp to the valid data end word.
Further, the receiving end receives the data and stores the data into a buffer area, the checksum is calculated and verified, the data type is read, if the data is periodic data, the timestamp data is read again and compared with the timestamp data of the previous frame to judge whether the frame is lost or not, meanwhile, the continuity of the frame sequence is compared to judge whether the frame is lost or not, if the frame is not lost and the verification is normal, the receiving end feeds back a data packet taking the frame sequence as the data to the sending end, and if the frame is lost or the verification fails, the receiving end feeds back the data packet taking-1 as the data to the sending end.
Further, the receiving end reads the data type as the event data, calculates the checksum and verifies the data type, and feeds back the data packet with the event type and the frame sequence to the sending end.
Further, when transmitting the event data, if the sending end does not receive the feedback from the receiving end, the sending end retransmits for 3 times at an interval of 25 milliseconds, and if the sending end does not receive the feedback, the sending end reports the communication abnormality through the human-computer interface.
The invention has the beneficial effects that:
1. the portable simulation test terminal can be flexibly deployed in an airplane section with a bus acquisition interface, the mobile terminal subsystem can be flexibly deployed at the position of each sensor of the airplane, can be a tablet personal computer and/or a mobile phone and/or a notebook computer, and has strong universality, convenient and quick use, and strong expansibility because the number of deployed mobile terminals can be determined according to needs;
2. by means of the networking relay technology of 1 and/or more wireless routers of the wireless routing subsystem, the problem of insufficient signal coverage rate of a wireless local area network is solved, and communication blind areas of all sections of an airplane are swept;
3. by adopting a communication mode with a check and feedback mechanism on the basis of an Ethernet technology, the avionic bus data is ensured to be reliably transmitted in a wireless network in real time so as to meet the requirement of avionic bus data communication quality;
4. through information sharing and state confirmation between the portable simulation test terminal and the mobile terminal subsystem, accurate monitoring and state confirmation of an avionic system network are achieved, test results can be quantized, test coverage is improved, assembly debugging and onboard ground tests are more sufficient, and accordingly confidence of the test results is improved.
Drawings
FIG. 1 is a system architecture diagram of the present invention;
FIG. 2 is a block diagram of the structure of the portable simulation test terminal according to the present invention;
FIG. 3 is a block diagram of the components of the wireless routing subsystem of the present invention;
fig. 4 is a block diagram of the components of the mobile terminal subsystem according to the present invention.
101-a portable simulation test terminal, 102-a wireless routing subsystem, and 103-a mobile terminal subsystem; 11-display control module, 12-data processing module, 13-ICD (interface control document) database module, 14-429 bus transceiver module, 15-AFDX (avionics full duplex switched Ethernet) bus transceiver module and 16-wireless Ethernet transceiver module; 21-a wireless router; 31-mobile terminal.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a portable avionics bus test system based on wireless Ethernet. As shown in fig. 1, the portable avionics bus test system comprises: the portable simulation test terminal 101 is connected with the wireless routing subsystem 102 in a communication mode through wireless Ethernet to complete sending of avionics bus data and receiving of state information acquired by the avionics bus data, the wireless routing subsystem 102 is respectively connected with the portable simulation test terminal 101 and the mobile terminal subsystem 103 in a communication mode through the wireless Ethernet to achieve distribution of the bus data, control instructions and state data, and the mobile terminal subsystem 103 achieves distributed bus data receiving and state feedback and achieves graphical display and control.
Referring to fig. 2, the portable simulation test terminal 101 has a display control module 11, a data processing module 12, an ICD database module 13, a 429 bus transceiver module 14, an AFDX bus transceiver module 15 and a wireless ethernet transceiver module 16. These functional modules are deployed in a portable ruggedized computer that employs the computer as a platform for hosting the applications of display control module 11, data processing module 12, and ICD database module 13, while installing 429 bus transceiver module 14, AFDX bus transceiver module 15, and wireless ethernet transceiver module 16. The display control module 11 is communicably connected with the data processing module 12 to complete functions of acquiring avionic bus data, displaying simulation data, controlling a simulation model, switching a display mode and the like, the data processing module 12 is communicably connected with the display control module 11, the ICD database module 13, the 429 bus transceiver module 14, the AFDX bus transceiver module 15 and the wireless Ethernet transceiver module 16 respectively to complete functions of reading interface definition, analyzing avionic parameter data, packaging simulation bus data, packaging wireless network data and receiving wireless network data, the 429 bus transceiver module 14 completes acquisition and transmission of 429 bus data, the AFDX bus transceiver module 15 completes acquisition and transmission of AFDX bus data, and the wireless Ethernet transceiver module 16 completes distribution of avionic bus data and feedback of a communication state of the receiving wireless terminal subsystem 103.
As shown in fig. 3, the wireless routing subsystem 102 includes: in this embodiment, the WS5281 intelligent wireless router with the capability of intelligent relay networking is used to construct the wireless routing subsystem 102, but the present invention is not limited thereto. Through configuration procedure, can realize many wireless routers of distributed deployment, adopt the optional communication of dual-band, wherein the 2.4GHz bandwidth is 400Mbps, and the 5GHz bandwidth is 867Mbps, realizes relaying networking function between each router, can realize that whole assembly factory building does not have wireless LAN signal in dead angle and covers. The wireless routing subsystem 102 provides basic media for avionics system bus data sharing, state data transmission and feedback data transmission, and guarantees information interaction of the portable simulation test terminal 101 and the mobile terminal subsystem 103.
As shown in fig. 4, the mobile terminal subsystem 103 has 1 or more mobile terminals 31, which may be platforms such as a tablet computer, a notebook computer, and a mobile phone, and all have a wireless ethernet transceiver module, and can receive avionics bus data, feed back reception status information, and simultaneously implement graphical display of avionics parameters, including but not limited to: atmospheric data system parameters, inertial reference system parameters, radio communication navigation system parameters, satellite navigation system parameters, core processing system parameters, electromechanical system parameters, and the like.
The portable simulation test terminal 101 and the mobile terminal subsystem 103 perform avionics bus data transmission and control data transmission through a wireless Ethernet network constructed by the wireless routing subsystem 102.
The avionic bus data transmission and control data transmission adopt a method with check sum feedback to ensure the real-time performance and reliability of communication.
The method comprises a method for processing periodic data and a method for processing event data, and is characterized in that:
the periodic avionics data and the event data are transmitted based on a UDP protocol, and the method is characterized in that the starting position of a data segment contains a 4-byte starting mark, 4-byte time stamp data is transmitted, a 4-byte data frame sequence is transmitted, a 1-byte data type is transmitted to represent the periodic data or the event data, 1 byte is transmitted again to represent the period length, no more than 1000 bytes of data are transmitted, a 4-byte checksum is transmitted again, and a frame detection sequence of UDP protocol data packets is transmitted finally, wherein the data checksum method comprises the following steps: the data of the time stamp is accumulated by calculation according to 32 bit words, and the 32 bit words are complemented by the following formula:
where SUM is the checksum, MOD stands for remainder, val (i) is the ith 32-bit word value, and n denotes the number of 32-bit words from the timestamp to the valid data end word.
The receiving end receives the data and then stores the data into a buffer area, calculates check sum and verifies the data, reads the data type, if the data is periodic data, reads the time stamp data and compares the time stamp data with the time stamp data of the previous frame to judge whether the frame is lost or not, if the frame is not lost and the check is normal, the receiving end feeds back a data packet taking the frame sequence as the data to the sending end, and if the frame is lost or the check is failed, the receiving end feeds back the data packet taking-1 as the data to the sending end;
if the data type read by the receiving end is the event data, the receiving end calculates the checksum and verifies the checksum, and feeds back the data packet with the event type and the frame sequence to the sending end;
when transmitting the event data, if the sending end does not receive the feedback of the receiving end, the sending end retransmits for 3 times at an interval of 25 milliseconds, and if the sending end does not receive the feedback, the sending end reports the communication abnormity through the human-computer interface.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (9)
1. A portable avionics bus test system is characterized by comprising a portable simulation test terminal (101), a wireless routing subsystem (102) and a mobile terminal subsystem (103); at least the wireless routing subsystem (102) is a hardware system formed by mutually and wirelessly connecting at least two wireless routers (21) to form an airplane ground test wireless network, and the wireless routing subsystem (102) is in data transmission connection with a mobile terminal subsystem (103); at least one portable simulation test terminal (101) is in data transmission connection with the wireless routing subsystem (102) and thus with the mobile terminal subsystem (103); the portable simulation test terminal (101) collects and sends airplane avionic bus data, and the mobile terminal subsystem (103) receives and feeds back distributed bus data and performs graphical display and control.
2. A portable avionics bus test system according to claim 1, characterized in that the portable simulation test terminal (101) comprises a display control module (11), a data processing module (12), an ICD database module (13), a 429 bus transceiver module (14), an AFDX bus transceiver module (15) and a wireless ethernet transceiver module (16); wherein, the display control module (11) is connected with the data processing module (12) in a communication way and completes the functions of acquiring avionic bus data, displaying simulation data, controlling a simulation model and switching a display mode, the data processing module (12) is respectively connected with the display control module (11), the ICD database module (13) and the 429 bus transceiver module (14) in a communication way, the AFDX bus transceiver module (15) is connected with the wireless Ethernet transceiver module (16) to complete the functions of reading interface definition, analyzing avionic parameter data, packaging simulation bus data, packaging wireless network data and receiving wireless network data, the 429 bus transceiver module (14) completes the collection and sending of 429 bus data, the AFDX bus transceiver module (15) completes the collection and sending of AFDX bus data, and the wireless Ethernet transceiver module (16) completes the distribution of the avionic bus data and the feedback of the communication state of the receiving wireless terminal subsystem (103).
3. A portable avionics bus test system according to claim 1, characterized in that all wireless routers (21) of the wireless routing subsystem (102) are connected by a network, and all distributed wireless communication points of the aircraft stations are covered by a continuous coverage of wireless ethernet signals.
4. An internal data transmission method of a portable avionics bus test system, characterized in that the avionics bus data transmission and control data transmission of the portable simulation test terminal and the mobile terminal subsystem are carried out by adopting a mechanism with check and feedback to ensure the real-time and reliability of communication by using the portable avionics bus test system as claimed in any one of claims 1 to 3.
5. The internal data transmission method of the portable avionics bus test system according to claim 4, characterized by comprising the following steps:
the periodic avionics data and the event data are transmitted based on a UDP protocol, the starting position of a data segment contains a 4-byte starting mark, 4-byte time stamp data is transmitted, a 4-byte data frame sequence is transmitted, a 1-byte data type is transmitted to represent the periodic data or the event data, 1 byte is transmitted to represent the period length, data with the length not more than 1000 bytes is transmitted, a 4-byte checksum is transmitted, and finally a frame detection sequence of a UDP protocol data packet is transmitted.
6. The internal data transmission method of a portable avionics bus test system according to claim 5, wherein the data checksum method is: the accumulation is calculated by 32 bit words from the time stamp data, and the 32 bit words are complemented:
where SUM is the checksum, MOD stands for remainder, val (i) is the ith 32-bit word value, and n denotes the number of 32-bit words from the timestamp to the valid data end word.
7. The internal data transmission method of the portable avionics bus test system according to claim 6, characterized in that the receiving end receives the data and stores the data into a buffer area, calculates checksum and verifies the checksum, reads the data type, if the data is periodic data, reads the timestamp data and compares the timestamp data with the timestamp data of the previous frame to determine whether the frame is lost or not, if the frame is not lost and the verification is normal, the receiving end feeds back the data packet using the frame sequence as the data to the transmitting end, and if the frame is lost or the verification fails, the receiving end feeds back the data packet using-1 as the data to the transmitting end.
8. The internal data transmission method of a portable avionics bus test system according to claim 7, characterized in that the receiving end reads the data type as event data, calculates the checksum and verifies it, and feeds back the data packet with the event type and the frame sequence to the transmitting end.
9. The internal data transmission method of a portable avionics bus test system according to claim 8, characterized in that, when transmitting event data, if the transmitting end does not receive the feedback from the receiving end, the transmitting end retransmits 3 times at an interval of 25 msec, and if it does not receive the feedback, the transmitting end reports a communication abnormality through a man-machine interface.
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