Method for monitoring faults in a control computer using band-limiting filters

Band-limiting filters can be employed to monitor the propagation of signals, originating as external inputs of known structure, through dynamic systems. By generating and comparing band-limited signals at different points in a control system, faults in system behaviour may be detected. Earlier work has described the use of this technique for fault detection in complete closed-loop systems, and, in the paper, a similar approach is applied to monitoring hardware or software faults in a control computer.