A game is a decision-making situation in which each player attempts to act in such a way that the game's circumstances get close to what desirable for him. To reach this goal, a player needs to have a suitable est...
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The residual error in the WAAS solution contains low frequency elements that reduce the accuracy of the vertical navigation during flight tests of precision approaches conducted at The University of Oklahoma. In an ef...
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The residual error in the WAAS solution contains low frequency elements that reduce the accuracy of the vertical navigation during flight tests of precision approaches conducted at The University of Oklahoma. In an effort to determine if the WAAS-enabled GPS solution can be improved, the character of the errors was first determined. Static position error data from ten, geographically diverse, WAAS reference stations were initially collected continuously over the period of a month. A primary step in identifying the sources of error was to evaluate the spectral (periodic) content of the error signal. However, characterizing the spectral content of the error signal presents problems due to the extremely high sampling rate relative to the extremely slow periods of interest in the error signal. The WAAS signal was sampled at 1 Hz, yet the periods of interest are on the order of 10-5 Hz. Using our proposed method for extracting the near DC frequency content, it is shown that the WAAS residual error primarily contains periodic elements on the order of 6, 12, and 24 hours, which correspond to frequencies of approximately 4.6x10-5, 2.3x10-5, and 1.2x10-5 Hz, respectively. These results were consistent across the disparate geographic regions represented by the data set. Due to this, we think it unlikely that multi-path is responsible for these slow, periodic components in the residual error signal. Therefore, it is likely the periodic elements of the error signal are due primarily to the ionosphere.
Quantitative design of robust control systems proposes a transparent and practical controller design methodology for uncertain plants. In the case of large plant uncertainties, the resulted robust controller would be ...
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This paper proposes a reconfigurable controller design method for multivariable systems, which is capable of dealing with order-change problems that may occurs in an after-fault system. A new method is proposed to rec...
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This paper proposes a reconfigurable control system design methodology using the sliding-mode control. The advantage of the proposed sliding-mode reconfigurable control methodology is that it is more robust than the s...
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Different from most power systems, the requirement for reliability of the power system on board a spacecraft is much more stringent. However, the reliability of the spacecraft power system can not be solely realized b...
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As the interest of location based-service and ubiquitous environment is proliferated, the development of technologies to determine mobile station location indoors and outdoors is basically demanded for providing vario...
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As the interest of location based-service and ubiquitous environment is proliferated, the development of technologies to determine mobile station location indoors and outdoors is basically demanded for providing various services based on user's location. Representatively, GPS(Global Positioning System) is the most well-known positioning system, but actually isn't an adequate system indoors because of the weakness of positioning signals, NLOS(Non-line of sight) and multipath. Therefore, recently in order to replace it, new technologies using WLAN have been presented. In the thesis, as estimating NLOS errors between mobile station and access points using reference points, a triangulation positioning method based on signal strength will be proposed. Also, indoor positioning experiment results will be shown.
An improved reinforcement learning algorithm is proposed in this paper. This algorithm is based on linear programming method for finding the best-response policy. A pursuit example is tested and the results show that ...
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This paper presents an adaptive output feedback control scheme for systems with uncertain actuator failures whose values are variant. An effective controller structure is developed for adaptive actuator failure compen...
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A new adaptive output feedback design using dynamic bounding is presented for actuator failure compensation of a class of nonlinear systems with unknown nonlinearities bounded by output-dependent functions and dynamic...
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