Optimality of incompletely measurable active and passive attitude control systemsPassive attitude control systems and active systems with incomplete state measurements are only suboptimal systems in the sense of optimal control theory, since optimal systems require complete state measurements or state estimations. An optimal system, then, requires additional hardware (especially in the case of flexible spacecraft) which results in higher costs. Therefore, it is a real engineering problem to determine how much an optimal system exceeds the suboptimal system, or in other words, what is the suboptimal system's degree of optimality. The problem will be treated in three steps: (1) definition of the degree of optimality for linear, time-invariant systems; (2) a computation method using the quadratic cost functional; (3) application to a gravity-gradient stabilized three-body satellite and a spinning flexible satellite.
Document ID
19740056753
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Schiehlen, W. (NASA Marshall Space Flight Center Huntsville, Ala., United States)
Popp, K. (Muenchen, Technische Universitaet Munich, Germany)