Hot-standby fault detection and recovery method based on bus controllers

Abstract

The invention discloses a hot-standby fault detection and recovery method based on bus controllers. The method comprises the following steps that S1, each remote unit on a bus periodically sends a data backup request to the bus controller; S2, the bus controller obtains backup data of the remote units and stores the backup data locally; S3, the bus controller periodically sends a test command to each remote unit, wherein the test command is used for testing whether each remote unit is in a normal working state or not; and S4, each remote unit receives the test command, then carries out processing according to a corresponding requirement, and stores a test result to a bus buffer. According to the method, faults of the remote units on the bus can be automatically detected; under fault condition, communication connection with standby single machines are carried out; the standby single machines recover newest task states and data before the faults through utilization of a backup / recovery mechanism; fault loss is reduced as much as possible; and reliability and security of a whole satellite are improved.

Description

technical field [0001] The invention relates to a fault detection and recovery method, in particular to a bus controller-based dual-computer fault detection and recovery method. Background technique [0002] The on-board data management system is connected with other subsystems on the satellite through the serial data bus to complete the collection of telemetry, the distribution of remote control, the maintenance and release of time reference, and coordinate the various subsystems to complete various program-controlled operations (such as completing payload imaging and image data to the ground) or emergency treatment, etc. The on-board data management system acts as a bus controller to organize bus communication and complete data transmission and scheduling. Each remote unit, that is, each subsystem stand-alone connected to the bus, responds after receiving the command sent by the bus controller, and completes the receiving or sending of data. [0003] Each subsystem stand...

AI Technical Summary

Problems solved by technology

This heartbeat link-based dual-machine fault detection and recovery method has the following obvious deficiencies in practical applications: the fault recovery is realized by switching control rights, and the machine-cut backup opportunity ignores the operating status data before the host failure, which will lead to The discontinuity of the task operation status may even bring safety hazards under certain working conditions, requiring ground injection data intervention

At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

Images