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This paper develops a solution to the cooperative output tracking problem of a network of non-minimum phase (NMP) vehicles under a direct and time-varying communication topology. The desired trajectory is generated by a linear exo-system and accessible to partial vehicles. The solution consists of three modules: a distributed observer network (DON), a causal stable inversion (CSI), and a state trajectory...
Two robust controllers, a linear disturbance estimator (DE) based controller and a standard integral controller, are respectively designed for multiple 3-DOF helicopters to achieve attitude-trajectory synchronization in both elevation and pitch tracking. These two controllers are shown to have similar structure but with different tuning parameters. It is further discovered that DE benefits from a...
Second-order consensus tracking problem of uncertain multi-vehicle systems without velocity measurements is studied on the directed communication topologies. We first construct two dynamic controllers via a passivity-based approach for the nominal vehicle model, which are linear and bounded (nonlinear) respectively. We then develop conditions on linear uncertainty and disturbance estimators (UDEs)...
Azimuth resolution of Missile-borne synthetic aperture radar(SAR) is affected by the trajectory and look angle. In order to acquire the fixed azimuth resolution within a minimum time for SAR imaging seeker, a new approach of solving optimal control problem, that is, Gauss Pseudospectral Method(GPM), is proposed to optimize imaging phase trajectory of Missile-borne SAR. First of all, optimization model...
In this paper we consider the flight-trajectory tracking problem of an input-disturbed non-minimum phase vertical takeoff and landing (VTOL) aircraft with delayed attitude measurements. By applying the first-order Pade?? approximation method to deal with the time delays, the problem is reduced to the output tracking of a new high-order non-minimum phase system without delay, whose dynamics are then...
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