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This paper describes a nanosatellite attitude control being able to perform fault tolerant control to increase a reliability of a nanosatellite. A fault-tolerant sliding mode controller is used for a nanosatellite using four reaction wheels as a set of actuators. The fault-tolerant sliding mode controller is designed to perform the rest-to-rest maneuver of a satellite system. The actuator fault reflects...
The main focus of this paper is to design a more accurate optimal/suboptimal fault tolerant state estimator for relative dynamic model representing formation flying of two satellites in low Earth orbit (LEO). First of all a mathematical model describing the relative dynamic motion of two satellites in formation is derived and next state estimation based on Kalman filter is emphasized. The measurement...
This paper presents an INS/CDGPS integration system providing a stable navigation solution under the condition of frequent blockage of the GPS signals. In the CDGPS, the Hatch filter is widely used by combining code and carrier phase measurement. Thus the accuracy of the filter depends on both that of measurements. However, the averaged code accuracy of the Hatch filter cannot reach the low noise...
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