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Agile satellites have rapid development in recent years. High accuracy attitude determination is the guarantee of its rapid attitude maneuver control. Star sensors are the most accurate attitude measurement device. An effective star identification algorithm for star sensors is proposed in the paper which is especially applicable on agile satellites. It can realize identification accurately and effectively...
In this paper, an adaptive output feedback tracking control scheme is proposed for spacecraft formation flying (SFF) in the presence of external disturbances, uncertain system parameters, input constraints and partial loss of control effectiveness. The proposed controller incorporates a pseudo-velocity filter to account for the unmeasured relative velocity, and the neural network (NN) technique is...
This paper proposes a novel voltage control method for single-phase shunt active power filter (SAPF) using the space vector pulse-width modulation (SVPWM). The method provides compensation for harmonics and reactive power and has an excellent dynamic performance. A detailed analysis is presented for the principle of single-phase SVPWM. The APF's current reference is obtained by subtracting the measured...
In this letter, a new endmember extraction algorithm based on adaptive differential evolution (DE) (ADEE) is proposed for hyperspectral remote sensing imagery. In the proposed algorithm, the endmember extraction is transformed into a combinatorial optimization problem through constructing the objective function by minimizing the root mean square error between the original image and its remixed image...
According to the analysis of problems existed in grey evaluation model of operation information system assessment, Based on the rough set theory, a grey comprehensive evaluation model Based on rough set attribute reduction. This paper discusses the evaluation process of the model, the multi-level and the establishment of a operation information system survivability evaluation index system, has carried...
In order to further improve the attitude control accuracy of the spacecraft and analysis the star identification algorithm, an effective simulation method of star atlas is proposed. This approach utilizes the same field of view in different latitude to calculate the exact position of observed stars in the charge-coupled device (CCD) image plane. Based on the magnitude, right ascension and declination...
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