传感器是任何测控系统中不可缺少的部件，也是最容易出故障的环节，传感器故障检测、识别和信号重构一直得到极大的重视．本文研究了仅利用双余度传感器的输出信号进行故障检测与识别问题，提出了一个双余度传感器故障信号识别器（ＦＳＤ），建立了故障信号识别的基本原理，导出了相应的传感器故障检测与识别的递推算法，并给出了仿真结果． Sensor is an indispensable part of any measurement and control system, and is also the most prone to failure. Sensor fault detection, recognition and signal reconstruction have drawn great attention. This paper studies the problem of fault detection and identification using only the output signals of double redundant sensors. A double redundant sensor fault signal recognizer (FSD) is proposed. The basic principle of fault signal recognition is established and the corresponding sensor fault detection And recursive recognition algorithm, and gives the simulation results.