Sensor Fault Detection and Analytical Redudancy Satellite Launcher Flight Control System

Alvaro Prieto Oliva

Instituto de Aeronáutica e Espaço (IAE) -
Divisão de Sistemas Espaciais
CNPq Researcher 12228-904,
São José dos Campos, SP - Brasil
e-mail: oliva@ase2.iae.cta.br

Resumo:

Abstract:

A study on the inclusion of analytical redundancy and of an instrument fault detection scheme ( IFD ) into a flight control system has been performed for a satellite launcher using the longitudinal model. The study was mainly focused in the fault diagnosis aspect, and it reports the conclusions obtained for this kind of control system. A fault diagnosis logic has been created based on nonlinear functions, its derivatives with respect to time, and on the control rate effort. Several simulations were run to assess the system performance, and a study about the robustness of the system with respect to system parameters uncertainties was also performed and both are reported here. It was found that the system is able to reconfigure the control law safely in almost all the situations and the false alarm rate presented was also very low. The system is simple as the same observers are used for the decision logic and for the alternative observer-based control laws. The main feature of the work is the inclusion of the derivatives of the nonlinear functions into the decision logic.

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