Verification Research on On-line Monitoring Method of Aircraft ARINC825 Bus Cable Fault Based on SSTDR

Abstract

The online monitoring method based on the spread spectrum time domain reflectometry (SSTDR) theory is studied to detect the intermittent fault of the aircraft ARINC825 bus cable. Firstly, the impedance characteristics and reflection characteristics of the aircraft ARINC825 bus cable fault are analyzed, and the online monitoring method model is constructed. Secondly, the frequency and amplitude of the monitoring signal is designed according to the ARINC825 protocol and airworthiness standard. Finally, the experimental platform is built to verify the proposed method. On-line monitoring experiments are carried out with multiple sets of ARINC825 bus cables. The results show that the positioning accuracy and fault type judgment accuracy of fault online monitoring are very high. Therefore, the method has proved to be feasible.