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Gyro-less attitude and angular rate estimations are of great importance in small, low-cost spacecraft, where high performance gyroscopes are not available due to multiple limitations. Recent development of accurate, high-bandwidth attitude sensors such as high data-rate star trackers, makes this approach implementable. The gyro-less estimator propagates the estimated states by nonlinear attitude dynamics...
In recent years, high performance smallsats have experienced a rapid advancement, micro/nanosatellites based space system turned more powerful platforms and are to be aggregated as building blocks to construct large spacecraft with enhanced payload capabilities. The mission and technique development requires more compact while better precision and agility attitude control system. Magnetically levitated...
In this paper, we consider the consensus-based quaternion estimation problem of aggregated spacecraft with multiple sensors. It is known that the quaternion has an inherent unit-norm constraint and a subtle ambiguity since the mapping from the rotation matrix to the quaternion is two-to-one. These facts imply that the updates for the quaternion should be multiplicative instead of additive and make...
This paper provides a novel algorithm for the estimation of spacecraft attitude and augmented parameters (the angular velocity and the gyroscope drift). We use the quaternion to represent the attitude of a rigid body and the attitude kinematics and dynamics of the spacecraft are naturally described by nonlinear equations. Multiplicative extended Kalman filter (MEKF) is a classical algorithm to estimate...
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