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This paper concerns the complete loss of reaction wheel effectiveness problem for the attitude control system of microsatellites. An anti-disturbance tolerant control method with disturbance rejection and compensation is presented. Due to the complete loss of reaction wheel effectiveness, four reaction wheels are applied for attitude control, which not only considering the external environment disturbance...
This paper concerns the reaction wheel failure and system with partial unmeasurable states for the attitude control system of microsatellites. An anti-disturbance tolerant control method based on output feedback control is presented. Due to the disturbance of flexible component vibration and failure of reaction wheel, an disturbance observer based on output feedback control is proposed firstly. Furthermore,...
A novel method on characteristic lines extracting of digital images is presented in this paper by using the moment of inertia theory, which is used to extract the characteristic lines in digital images through treating them as rigid bodies. The characteristic lines process scale and rotation invariant inherently. Experimental results manifest that using the angle difference between characteristic...
A new algorithm based on facet model and Particle filter is presented to detect infrared small moving target in image sequence. Firstly, it utilizes a Bayesian based particle filter method to track the target in image sequence and get the target search window. Then the detection is performed on the image intensity surface of search window fitted by cubic facet model. The new partial derivative operators...
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