On-board data management system self fault-tolerance method

The invention relates to an on-board data management system self fault-tolerance method. A on-board data management system self fault-tolerance mechanism is divided into three levels: data fault tolerance, part level fault tolerance and system level fault tolerance, and the operations are sequentially carried out during the fault tolerance. The data fault tolerance comprises three aspects: data protocol verification, 1553B bus interface fault tolerance and RS422 bus fault tolerance. The part level fault tolerance comprises three aspects: random-access memory (RAM) chip fault tolerance, software watchdog fault tolerance and signal clock fault tolerance. The system level fault tolerance comprises two aspects: data management computer self switching fault tolerance and remote placing unit self switching fault tolerance. The method provided by the invention provides the fault tolerance at the data level, the part level and the system level, and the fault tolerance processing can be carried out on the data, the main function module and the single machine equipment. Through the layered fault tolerance processing, the respective fault tolerance on faults at different harm degrees can be realized. Through the layered fault tolerance processing, the cost caused by faults at a low harm degree can be reduced, and the reliability is also improved because corresponding fault tolerance measures are respectively adopted for various faults.