Attitude Determination
Mostrando 1-12 de 26 artigos, teses e dissertações.
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1. Satellite Inertia Parameters Estimation Based on Extended Kalman Filter
ABSTRACT: The moment of inertia parameters play a critical role in assuring the spacecraft mission throughout its lifetime. However, determination of the moment of inertia is a key challenge in operating satellites. During satellite mission, those parameters can change in orbit for many reasons such as sloshing, fuel consumption, etc. Therefore, the inertia
J. Aerosp. Technol. Manag.. Publicado em: 28/03/2019
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2. Design of Attitude Control Servomechanisms with Fluid Ring and CMG for Rigid Satellite
ABSTRACT: Satellites cover a wide range of space missions as remote sensing. Accomplishment of the mission depends on satellite's stability maintenance and direction. The main task of the attitude control system is to provide stability to the satellite against external disturbances. Such perturbations are caused due to aerodynamic drag, solar radiation and m
J. Aerosp. Technol. Manag.. Publicado em: 08/11/2018
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3. The Motivation to Participate in Citizen-Sourcing and Hackathons in the Public Sector
Abstract Key challenges of how citizens can be motivated to participate in citizen-sourcing initiatives remain unaddressed. In this paper, we identified the influence of eight motivation variables in the number of participations in Hackathons, a citizen-sourcing initiative, in Brazil. We adapt different models from Self-Determination Theory and the Theory of
BAR, Braz. Adm. Rev.. Publicado em: 08/10/2018
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4. The ITASAT CubeSat Development and Design
ABSTRACT: Because they are inexpensive platforms for satellites, CubeSats have become a low-cost way for universities and even developing countries to have access to space technology. This paper presents the ITASAT design, particularly the Attitude Determination and Control Subsystem, the Onboard Software, and the Assembly, Integration and Testing program. T
J. Aerosp. Technol. Manag.. Publicado em: 2017-06
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5. Unscented Kalman Filter for Determination of Spacecraft Attitude Using Different Attitude Parameterizations and Real Data
ABSTRACT The non-linear estimators are certainly the most important algorithms applied to real problems, especially those involving the attitude estimation of spacecraft. The purpose of this paper was to use real data of sensors to analyze the behavior of Unscented Kalman Filter (UKF) in attitude estimation problems when it is represented in different ways a
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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6. Comparison of the Incident Solar Energy and Battery Storage in a 3U CubeSat Satellite for Different Orientation Scenarios
ABSTRACT In CubeSats, because the size is limited, the estimation of the incident solar energy according to the orbital parameters and satellite attitude is more critical for the design process of the electrical power system. This estimation is helpful either for sizing of the power sources and energy storage or for defining the operation modes of the CubeSa
J. Aerosp. Technol. Manag.. Publicado em: 2016-03
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7. Determining the Fixed Pattern Noise of a CMOS Sensor: Improving the Sensibility of Autonomous Star Trackers
ABSTRACT: Autonomous star trackers are optical-electronic devices used for attitude determination of artificial satellites, having as a reference for this computation the positions of stars. There is one autonomous star tracker in development at the Aerospace Electronics Division of the Brazilian National Institute for Space Research. The autonomous star tra
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
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8. Atitude e motivação em relação ao desempenho acadêmico de alunos do curso de graduação em administração em disciplinas de estatística / Attitude and motivation in relation to the academic performance of undergraduate students in management courses in statistics
Em uma sociedade que apresenta ênfase no conhecimento, torna-se importante analisar uma quantidade significativa de informações contidas nos bancos de dados, objetivando transformá-las em conhecimentos utilizáveis, tanto para fins comerciais, quanto científicos. A Administração surge como uma área em que uma grande multiplicidade de aplicações est
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/10/2012
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9. AvaliaÃÃo da intenÃÃo de realizar mamografia como subsÃdio para aÃÃes na promoÃÃo da saÃde / Intention assessment to perform mammography as support to actions to the health promotion
Recognizing the magnitude of the public health problem that breast cancer has become over the years and considering mammography as specific procedure for early detection, mammography screening was elected as desired behavior for this investigation. The aim was to assess the behavioral intention and its determinants to perform mammography screening among wome
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/03/2010
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10. Reich, Espinosa e a educação / Reich, Espinosa, and the Education
Wilhelm Reich (1897-1957), Austrian dissentient psychoanalyst, and Benedictus de Spinoza (1632-1677), Dutch philosopher, are authors which works converge at the struggle for a free and active man, leading to the composition of educational perspectives heading human power. This theoretical study focus on the contributions, by both these thinkers, at the educa
Publicado em: 2010
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11. ELABORATION OF ENERGETIC EFICIENTIZATION MANUAL FOR USE IN MICRO AND SMALL RETAIL COMERCIAL COMPANIES / ELABORAÇÃO DE MANUAL DE EFICIENTIZAÇÃO ENERGÉTICA PARA APLICAÇÃO EM MICRO E PEQUENAS EMPRESAS COMERCIAIS VAREJISTAS
This dissertation brings a plan for improvements in the form of a technical manual on combating waste electrical energy in micro and small enterprises commercial retailers, energy of diagnosis-based microenterprises and small commercial enterprises retailers Santa Maria- RS. Thus, technical manual enables to micro and small enterprises, eficientization actio
Publicado em: 2009
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12. Identificação de estrelas para determinação de atitude de veículos espaciais utilizando o algoritmo da otimização extrema generalizada (GEO) / Star pattern identification for spacecraft attitude determination using generalized extremal optimization (GEO)
Este trabalho tem como objetivo principal a realização de um estudo sobre a performance do algoritmo da Otimização Extrema Generalizada (GEO) na solução do problema Perdidos no Espaço utilizando sensor de estrelas. Este problema consiste na determinação da atitude de um veículo espacial, ou seja, a orientação dos eixos fixos no corpo deste em rel
Publicado em: 2009