In this article a new concept of a smart satellite pushbroom imaging system with internal compensation of attitude instability effects is presented. The compensation is performed within the optical path by an active opto-mechatronic stabilization of the focal plane image motion in a closed loop system with visual feedback. The real-time image motion measurement is derived from an auxiliary matr...

The paper presents a quaternion feedback attitude control law for spacecraft attitude maneuver. A nonlinear feedback controller is designed to achieve L2 gain performance, i.e., the resulting closed-loop system is designed such that the L2 gain from the exogenous disturbance to the performance measure is less than a scalar. The solution of the nonlinear H∞ control problem is known to be related...

This study adapts from job performance theory and field theory, a multilevel model to identify and validate the antecedents and their effects on information system (IS) success in the user department. The model is validated by using hierarchical linear modelling (HLM) method with survey data of 283 user managers and 42 top managers collected from 42 manufacturing companies in China that were ut...

This paper presents the design, analysis, and performance evaluation of an attitude filter for an Intervention-Autonomous Underwater Vehicle (I-AUV) working in tandem with an Autonomous Surface Craft (ASC). In the proposed framework, an ASC aids an I-AUV to determine its attitude by providing an inertial reference direction vector through acoustic modem communications, which is measured in body...

backgroundbreastfeeding is a natural way to provide nutrients required for proper growth and development of infants. in view of that, it is of great importance to enhance the knowledge of mothers on exclusive breastfeeding in the first six months after birth and the time of starting complementary feeding. this study aimed to assess the training needs of mothers on exclusive breastfeeding, was c...

To meet the asymmetric (sub micro-radian towards Earth, tens of micro-radians elsewhere) pointingrequirements of the RIP mission, a hybrid approach to optical attitude determination is suggested. Aredundant pair of Coarse Star Scanners (CSS) have line-of-sight normal to the spin axis. If attitude updaterates are not too high, a straightforward extension of presently available techno...

In this paper, a star tracker attitude estimation procedure with increased robustness and efficiency, using the AIM (Attitude Estimation using optimal Image Matching) algorithm, is presented and validated. The unique approach of the AIM algorithm allows us to introduce a reliable quality check which can be efficiently calculated. Unlike existing validation methods, this quality check not only d...