RT Journal Article ID 4e5d81ee279b51c1 A1 Volosov, Victor V. T1 Attitude Control of a Spacecraft in the Orbital Coordinate System Using Ellipsoidal Estimates of its State Vector JF Journal of Automation and Information Sciences JO JAI(S) YR 1999 FD 1999-06-01 VO 31 IS 4-5 SP 24 OP 32 K1 attitude control; spacecraft; orbital coordinate system; ellipsoidal estimates; state vector. AB The problem of attitude control of a rigid body in the orbital coordinate system is considered. Algorithms for ellipsoidal estimation of the state vector of the control object (CO) are used in the control loop. As distinct from the well-know algorithms, these algorithms are characterized by robustness relative to violations of a priory assumptions as to CO. The control algorithms are synthesized based on the direct Lyapunov method and its generalizations. The efficiency of the adaptive control algorithms is illustrated by results of computer simulation. PB Begell House LK https://www.dl.begellhouse.com/journals/2b6239406278e43e,13d836c01da77016,4e5d81ee279b51c1.html