When designing a distributed system where a certain level of cooperation among real people is important, for example CSCW systems, systems supporting workflow processes and peer-to-peer (P2P) systems, it is important to study the evolution of relationships among the users. People develop attitudes to other people and reciprocate the attitudes of other people when they able to observe them. We a...

Global navigation satellite system (GNSS) ambiguity resolution is the process of resolving the unknown cycle ambiguities of the carrier phase data as integers. The sole purpose of ambiguity resolution is to use the integer ambiguity constraints as a means of improving significantly on the precision of the remaining GNSS model parameters. In this contribution, we consider the problem of ambiguit...

This paper discusses a dynamic observability analysis for attitude, angular velocity, shape, and surface parameters of Space Objects (SOs) using non-resolved images or light curve measurements. The Fisher information matrix and CramérRao lower bound are introduced for calculating the observability of parameters used in SO models. Light curve measurements are known to be functions of SO rotation...

The paper treats a question of controller design for aircraft pitch attitude in the presence of uncertain aerodynamics. The presented design methodology guarantees desired pitch attitude transient performance indices by inducing of two-time-scale motions in the closedloop system where the controller dynamics is a singular perturbation with respect to the system dynamics. Stability conditions im...

This paper presents nonlinear tracking control systems for a quadrotor unmanned aerial vehicle under the influence of uncertainties. Assuming that there exist unstructured disturbances in the translational dynamics and the attitude dynamics, a geometric nonlinear adaptive controller is developed directly on the special Euclidean group. In particular, a new form of an adaptive control term is pr...