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This study proposes a novel tracking method for Global Navigation Satellite System (GNSS) signal carrier, based on fractional Fourier transform. This method not only overcomes the limitations caused by the tripartite trade-off between tracking accuracy, loop bandwidth and dynamic stress, but also needs no auxiliary devices such as inertial measurement units (IMUs). Through a time–frequency analysis...
In this paper, we propose a new control strategy for flexible spacecraft attitude maneuvers in the presence of an uncertainty inertia matrix, actuator constraints and external disturbances. The Vibration of flexible appendages, inertia matrix uncertainty and external disturbances (coming from space environmental, sensors and actuators error, etc.) are considered as the total disturbance to be estimated...
Flexible spacecraft often has light damping and the natural frequencies are often low and closely spaced. To suppress the vibration effectively, a scheme that combined on-orbit identification and vibration suppression method is proposed. OKID identification algorithm is analyzed and then applied to a solar panel. The excitation method for identification is discussed. Moreover, OKID is compared with...
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