Distributed system-level task synchronization method based on time-triggered

Abstract

The invention discloses a distributed system-level task synchronization method based on time triggering. The method comprises the following steps: firstly, building a system architecture model based on a time triggering information network, and connecting equipment nodes needing to be subjected to task synchronization to a data network; and performing periodical task synchronization on all the equipment nodes according to an execution period of a periodical system-level synchronization task. The synchronization method mainly depends on protocol message forwarding relationships between the equipment nodes and a data switch and a transmission time measuring capability. The data switch sends synchronization messages to the equipment nodes in a system to perform time statistics, and gets median arrival time of all synchronization messages according to a median algorithm. Then, the switch sends response messages on the basis of the median time, and time differences between actual time and expected time when the equipment nodes receive the response messages, namely, time quantities needing to be corrected by local clocks of the equipment nodes are obtained. On the basis of corrected new clocks, the equipment nodes start system-level synchronization task execution operations in a current period.

Description

technical field [0001] The invention relates to a time-triggered system-level task synchronization method, which belongs to the field of strong real-time synchronization of distributed system tasks in spacecraft or industrial control. Background technique [0002] According to the overall plan of the third phase of the national lunar exploration project, our country should independently develop the lunar exploration vehicle Chang'e-5 that can complete orbiting, landing, and returning. In the process of completing the lunar exploration mission, since the Chang'e-5 aircraft is composed of multiple sub-aircraft that perform different functions, there are strong requirements for data interaction, timing and parallel execution of tasks. [0003] Most of the data exchange in the traditional spacecraft system is completed through point-to-point serial channels or 1553B buses. Most of the equipment nodes in the system do not have a task passing relationship. If it is necessary to sy...

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Problems solved by technology

[0008] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and ensure the synchronization of system-level tasks in large-scale distributed systems. Traditional system-level task scheduling based on time synchronization mostly relies on hardware synchronization signals, and hardware synchronization signals mostly It is transmitted to each device node by the core equipment in the system through a centralized sending method, which increases the weight and power consumption of the system (additional cables and transmitters are required), and if the core equipment in the system is damaged, the whole system will be trapped. Unsynchronized failure states with low system-level reliability

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