Abstract: Aircraft sensors are less reliable components in flight control and navigation systems, In order to improve the system reliability, it is desired to detect and identify the faulty sensor and reconstruct the signal measured by the sensor in real time. Hardware and analytieal redundancy are adopted for this purpose. In this paper, a comprehensive survey is given to the analytical redundancy technology. Numerous schemes of analytical redundancy for aircraft sensors are introduced. The principle of statistical decision making for analytical redundancy and the robustness of failure detection and identification algorithms are discussed briefly.

Key words: Failure detection and identification, analytical redundancy, System reli-ability