Research on Fault Detection and Location Method of Avionic Data Bus

Avionic data bus is an important channel to transmit information for aircraft control system and mechatronic system. Once it occurs a disconnection or short circuit fault, the communication of control system would fail and man-machine safety would be endangered. In this paper, several reflection methods are introduced. Among them, Spread Spectrum Time Domain Reflectometry (SSTDR) is emphatically discussed. The feasibility of applying SSTDR to fault detection and location of avionic data bus is analyzed theoretically. The transmission characteristics of several typical avionic data buses are introduced, and the reliability of communication under the interference of detection signal is analyzed. The amplitude and attenuation of SSTDR signal applied to data transmission bus is calculated. Simulation and experimental verification proves that the fault detection and location of avionic data bus using SSTDR method can ensure the accuracy, low bit error rate and feasibility.