Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
The paper proposes a novel power and bandwidth allocation mechanism for a multibeam satellite system in Ka-band or above. At such high frequency bands, rain attenuation severely impacts the performance and the use of PIMT techniques, such as the ACM technique foreseen in the DVB-S2 standard, is crucial. The proposed resource allocation mechanism is based on the observation that it would be more efficient...
Large aerospace organizations typically spend significant resources in optimizing system design by means of specialized software (e.g., computer-aided design, simulation). Conversely, architectural decisions are made much faster, with far less resources, and typically, in a much less structured way. This is despite clear indications that architectural decisions fix many design decisions, and have...
Wind Turbine performance improvement measurements are challenging, especially when improvements affect air flow to the nacelle anemometer sensor which is often used to baseline performance. Uncertainty in this area can impede optimization of wind farms by making it difficult to 1) show the benefit of upgrades to individual turbines, 2) jointly optimize wind turbine performance in a farm, and 3) validate...
A hybrid particle swarm-genetic algorithm optimization scheme was combined with Nelder and Mead's simplex method to produce an experimental hybrid method that integrates the global search capabilities of evolutionary heuristics with the highly effective localized search ability of the simplex method. This algorithm was applied to various missile design problems where the goal is to design a missile...
One of the devices used to determine the attitude of a satellite is the star tracker, whose principle of operation is based on star position measurements on a specific inertial frame, allowing precise attitude determination and control of the satellite. Due to the high sensitivity of star camera, bright objects like Sun, Earth or Moon must be avoided in the sensor's field of view. This characteristic...
A modified ant colony optimization (ACO) algorithm is applied to a single-stage solid missile design problem involving six degrees of freeedom (6-DOF) flight trajectory modeling. A local search procedure is also integrated with the algorithm, adding a search intensification ability that compliments the ability of ACO to thoroughly explore a solution space. The goal of this work is to evaluate the...
This paper presents an approach to optimize orbit geometries under satellite to satellite coverage criteria. The method described herewith is applicable to any space system concept featuring inter-satellite-links, including system concepts introducing links of opportunity between heterogeneous spacecraft at different orbits not designed a priori as a constellation. The latter is the case of federated...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.