Launch vehicle fault injection and fault diagnosis based on mil-std-1553b data bus

Fault diagnosis is critical to the operation of the launch vehicle, not only to avoid casualties and equipment losses, but also to save on operating costs. Considering the numerous launch vehicle systems, complex functions and various faults, this paper studies a fault diagnosis method based on MIL-STD-1553B (hereinafter referred to as 1553B) data bus, which can diagnose and predict system failure in real time and give decision on successful launch probability. By using the fault tree, the fault of the launch vehicle is detected and located, the failure chain is determined. Generally, it is difficult to obtain sufficient fault data in the ground test, which limits the fault diagnosis research. In order to get more failure data, a fault injection method based on 1553B bus is designed in this paper. In the launch vehicle fault diagnosis and injection system, the fault diagnosis system acts as a bus monitor (BM), and the fault injection system acts as a remote terminal (RT). They are connected to the 1553B bus, which connects the subsystem of the launch vehicle, and connects to the launch control platform outside the vehicle through the bus coupler. The simulations provided impetus for practical tests and the experimental test show expected results.