通过构造含有故障状态的增广系统并进行增广系统测量时滞的无时滞转换，将测量时滞系统的故障诊断问题转化为无时滞增广系统的状态观测问题。-The problems of fault diagnosis and self-restore control were studied for linear systems with delayed measurements. A reduced-order observer-based fault diagnosis approach was proposed