نوع مقاله : مقاله پژوهشی
نویسندگان
1 عضو هیات علمی / پژوهشگاه تحقیقات ماهواره، مرکز تحقیقات فضایی
2 عضو هیات علمی / دانشگاه صنعتی خواجه نصیرالدین طوسی
3 عضو هیات علمی / پژوهشکده سامانه های ماهواره پژوهشگاه فضایی ایران
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Using mathematical and databased modeling for designing navigation subsystems has some disadvantages such as the presence of uncertainty in the parameter's identification. In this paper, the dynamic Mathematical model of the attitude channels of the satellite is investigated. For this purpose, second-order sliding mode theory is employed to estimate external perturbation torques acting on an Earth-orbiting satellite. Then, due to the repetition of external perturbation torques in each orbital period, grey box modeling is proposed by applying estimated external perturbation torques to attitude mathematical modeling, attitude rate can be derived simultaneously. Next, to design fault detection and isolation subsystems, a proposed soft sensor is employed to generate the estimation residual as an indicator of predefined navigation faults. A nonlinear model of the earth-orbiting satellite is simulated using specific navigation failures. The results verified the feasibility of the proposed system. The simulation results show an improvement in the accuracy of the navigation data instead of the addition of a new hardware sensor.
کلیدواژهها [English]