Method for monitoring data integrity of military 1394 bus of distributed system

Abstract

The invention belongs to an avionics system technology, and relates to a method for monitoring data integrity of a military 1394 bus of a distributed system. The method is a method for a military 1394bus detection method which combines two bus check methods of heartbeat word monitoring and SVPC monitoring. A bus ILM online monitor is designed on the basis of two check modes, and a fusion judgingalgorithm is designed according to the fault frequency of the ILM monitor of the two check methods in a continuous period, so that a bus transmission signal is monitored, and thus the effectiveness ofthe bus is judged. A heartbeat word tolerance design applied to the military 1394 bus detection method is provided for bus operation cycles of different systems in the actual distributed system. Meanwhile, an SVPC check method for generating a check bit by a way of sequentially carrying out XOR calculation on data one by one is provided for bus data check.

Description

technical field [0001] The invention belongs to the avionics system technology, and relates to a data integrity monitoring method of a distributed system military 1394 bus. Background technique [0002] In today's aviation field or industrial field, with the rapid development of electronic technology, system integration, modularization, and systematization have become the main development trend, which has led to bus technology has already become an important part of system design, in the design of electronic products The performance of the bus transmission is one of the main factors that determine the speed, accuracy and safety of the entire aviation system. Among them, the military 1394 bus, as a high-speed serial bus, has been widely used in high-security fields such as data cameras, computers, industrial measurement and control, and even aerospace due to its high-speed, flexibility, and scalability. [0003] In the distributed system, the current comprehensive and modula...

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Problems solved by technology

[0003] In the distributed system, the current comprehensive and modular aviation subsystems mostly use the bus network to complete the communication work between the aviation LRMs (Line Replaceable Modules), which has a greater impact on data throughput, data transmission certainty and fault isolation capabilities. To meet the higher requirements, there will often be a large number of continuous and uninterrupted data packets that record key information in the network data communication using the military 1394 bus. Integrity is constrained, and the military 1394 bus is suitable for asynchronous transmission mode, how to effectively detect, analyze and process its faults has undoubtedly become a key technical issue for the monitor function

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