Results 261 to 270 of about 44,700 (293)

Attitude estimation and control of manoeuvring spacecraft

Automatica, 1985
An application of modern model-following control and estimation techniques to the attitude control of high performance, manoeuvring spacecraft emphasizes their usefulness as shown by results from both software simulations and in-flight experiments.
T. Zwartbol, R. F. van den Dam, A. P. Terpstra, P. T. L. M. Van Woerkom   +3 more
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Kalman Filtering for Spacecraft Attitude Estimation

Journal of Guidance, Control, and Dynamics, 1982
HIS report reviews the methods of Kalman filtering in attitude estimation and their development over the last two decades. This review is not intended to be complete but is limited to algorithms suitable for spacecraft equipped with three-axis gyros as well as attitude sensors.
E. LEFFERTS, F. MARKLEY, M. SHUSTER
openaire   +1 more source

Attitude estimation using moment invariants

Pattern Recognition Letters, 1993
The problem of estimating the three-dimensional rotational parameters of a rigid body from its monocular image data has been considered using the method of moment invariants. Second- and third-order moment invariants are used to construct the feature vector for the scale and orientation independent identification of the camera view axis direction in ...
Mukundan, R, Malik, NK, Ramakrishnan, KR
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On range and attitude estimation

Proceedings of 1994 IEEE Position, Location and Navigation Symposium - PLANS'94, 2002
Two algorithms to support an airborne, gimballed, electro-optical sensor are described. They have been designed for "Litening", a new targeting and navigation pod, which has been developed by Rafael. A full inertial measurement unit (IMU), capable of measuring linear acceleration and angular velocity, in three orthogonal axes, is mounted in the inner ...
openaire   +1 more source

On the Attitude Estimation of Earth Observation Satellites

IFAC Proceedings Volumes, 1983
Abstract A combined attitude estimation algorithm has been proposed, in which two variants of system model are used simultaneously. These models are put together to form two parts of the algorithm with the aim, that the first model provides the estimates of some observable quantities by using the linear kalman filter, while the second model is used ...
S.H. Yu, Q.P. Chu
openaire   +1 more source

Constrained sigma points for attitude estimation

2016 14th International Conference on Control, Automation, Robotics and Vision (ICARCV), 2016
The Kalman filter is considered as an optimal filter with the hypothesis of gaussian noise and linear model. For nonlinear model several approaches have been proposed and Unscented Kalman Filter (UKF) seems to be one of the most accurate. In this study, we wonder if an appropriate constraint can enhance the efficiency of UKF. We propose a new algorithm
Thomas Braud, Nizar Ouarti
openaire   +1 more source

Optimal estimation of ship's attitudes and attitude rates

IEEE Journal of Oceanic Engineering, 1979
Estimation of ship rotational motions induced by ocean waves plays a central role in many navigation and fire control applications. Inertial-type instruments are available which give good measurements of the attitude, but some form of signal processing is necessary to obtain angular rates or predict attitudes.
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Attitude estimation of a wearable motion sensor

2017 American Control Conference (ACC), 2017
This paper is concerned with the problem of attitude estimation for a wrist-worn motion sensor equipped with a 3-axis gyroscope and a 3-axis accelerometer. In the absence of motion and the with the arm in its natural resting state, the attitude is unobservable because the accelerometer's measurement of the gravity vector alone can not distinguish ...
Chi Zhang 0009, Amirhossein Taghvaei, Prashant G. Mehta   +2 more
openaire   +1 more source

Constraint in Attitude Estimation Part II: Unconstrained Estimation

The Journal of the Astronautical Sciences, 2003
A complete and careful foundation is presented for maximum-likelihood attitude estimation and the calculation of measurement sensitivity matrices with the intent of revealing heretofore undisclosed pitfalls associated with unconstrained quaternion estimation.
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Estimation of the local attitude of orbiting spacecraft

Automatica, 1970
Abstract Precise knowledge of spacecraft attitude is of interest for satellites nominally pointed at the earth, when aiming telescopes, cameras, and antennas, and as an essential ingredient in an active attitude control system. In earth orbit an horizon sensor can measure pitch and roll angles but cannot measure yaw angle since yaw motion does not ...
A.E. Bryson, W. Kortüm
openaire   +1 more source