This paper considers the location-tracking problem in PCS networks. Solutions to this problem in fact highly depend on the mobility patterns of mobile subscribers [ACM DIAL-M (1999) 72]. In the literature, many works have assumed a simple random walk model, where mobile subscribers always stay in a roaming state and can move in any direction with equal probability. In this paper, we propose a n...

In this paper, we propose a global optimal fuzzy tracking controller, implemented by fuzzily blending the individual local fuzzy tracking laws, for continuous and discrete-time fuzzy systems with the aim of solving, respectively, the continuous and discrete-time quadratic tracking problems with moving or model-following targets under finite or infinite horizon (time). The differential or recurs...

This research applied Proportion and Integration (PI) type fuzzy methods for mobile satellite antenna control system design. The detailed block diagram of a satellite antenna tracking system is very lousy; it is very difficult to obtain the key parameters for analyses and simulation. Thus a simplified model of antenna pitching or yawing control system is applied to speed up the design and obtai...

Ionospheric scintillation has a significant impact on the availability of Global Positioning System (GPS) and Wide Area Augmentation System (WAAS), especially when the GPS/WAAS receiver is dynamically stressed. An example of such a scenario would be an aircraft using WAAS to make an approach and landing. This study investigated the tolerable wideband interference level given various conditions ...

In this paper, we investigate the optimisation of the loop filter for delay tracking loops in direct sequence spread spectrum systems. We search for a good trade-off between reducing noise effects and having a sufficiently reactive loop. This study is done on both the initial tracking phase, where the loop must compensate acquisition errors, and the permanent one, where the loop must follow del...

in the most described maximum power point tracking (mppt) methods in the literatures, the optimal operation point of the photovoltaic (pv) systems is estimated by linear approximations. however, these approximations can lead to less optimal operating conditions and significantly reduce the performances of the pv systems. this paper proposes a new approach to determine the maximum power point (m...

Compared with loose and tight integration, ultra-tight GPS/INS integration offers improved performance under exposure to high dynamics, jamming and interference by employing the advanced Kalman filter design methods. The ultra-tight configuration delivers unique advantages by aiding the GPS tracking loops with velocity estimates derived from the Kalman Filter. In this manner, only the errors in...

In this paper, control of a non-isothermal continuous stirred tank reactor in which two parallel autocatalytic reactions take place has been addressed. The reactor shows chaotic behavior for a certain set of reactor parameters. In order to control the product concentration, an optimal state feedback controller has been designed. Since concentrations of reactor species are ...

We describe a multi-loop robotic control architecture that for the fine-motion control required for object tracking uses two different loops that depend on entirely different approaches for visual servoing. One tracking loop uses fast blob analysis of the camera images for servo control. The other tracking loop, which is more robust but slower, uses model-based line matchings for a more robust ...

Dear Editor, This letter proposes a robust control strategy for the autonomous landing of quadrotor on moving target. Specifically, force command that consists cascade dynamics estimator and an optimal guaranteed cost law is exploited position-loop tracking. Then, orientation constraint torque employed attitude-loop tracking such refrains from flipping during operation. Stability analysis indic...