Estimação de atitude e velocidade angular em nanossatélites utilizando um observador de Luenberger para sistemas não lineares
The technological advances of the last decades, together with the standardization of the CubeSats, have made viable the use of nanosatellite for commercial and institutional purposes. Taking advantage of this trend, the National Institute of Space Research is developing the CONASAT project, which...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/27849 |
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| Resumo: | The technological advances of the last decades, together with the standardization of
the CubeSats, have made viable the use of nanosatellite for commercial and institutional
purposes. Taking advantage of this trend, the National Institute of Space Research is
developing the CONASAT project, which consists of a constellation of nanossatellites
for the collection of environmental data. Constellation interaction requires reasonable
accuracy of the satellite attitude determination and control system, despite the limitations
of the CubeSat platform and cost of the project. In this context, given the need to estimate
the attitude and angular velocity, the present work proposes a less complex alternative
to the Extended Kalman Filter (EKF). The solution consists of an implementation of the
Luenberger state observer for nonlinear systems, also considering the use of the QUEST
algorithm to obtain the attitude. The estimation scheme adopts a kinematic model of
the system with parameterization of the rotation matrix by quaternion, and a dynamic
model considering the object as a rigid body, with the presence of torque due to magnetic
disturbances. The attitude sensor system consists of a magnetometer and a sun sensor,
simulated from the ideal model with additional white noise. Finally, the implemented
estimator is evaluated using simulations, together with a norm constrained EKF approach.
The obtained results demonstrate the technical viability of the proposed method in the
attitude and angular velocity estimation in nanosatellites. |
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