“…In Merrill (1985), Merrill, DeLaat, and Bruton (1988), and Merrill, DeLaat, and Abdelwahab (1991), the authors studied sensor failure detection for jet engines using a Kalman filter with a generalized likelihood ratio testing-based scheme. In Duyar and Merrill (1992) and Duyar, Eldem, Merrill, and Guo (1994) the authors derived linearized models of jet engine systems via the a-canonical form parameterization identification method and applied a parameter estimation approach in fault detection and isolation (FDI) for the space shuttle main engine. In Patton andChen (1992, 1997) and Patton, Chen, and Zhang (1997), the authors studied fault detection of jet engine sensor systems using an eigenstructure assignment technique to design observer-based residual generators, and they also studied its robustness.…”