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The paper discusses the problem of aircraft airspeed estimation from ground speed measurement affected by the unmeasurable wind speed. The estimation has to be obtained along any flight trajectory where linearized dynamics and the associated trim conditions are available. Under these assumptions one feasible approach to this estimation task is to apply multiple model (MM) estimation based on a bank...
The paper proposes an alternative way to solve robust reference tracking problem. Instead of rejecting the effect of the disturbance directly, an intermediate step is built into the state estimation problem. The advantage of the methodology is to elaborate a modified optimal state estimation problem taking the unbiased estimate of the disturbance into account. Henceforward, the solution of the discrete...
The real world feasibility of a self-contained, purely vision based sense and avoid system, required for small unmanned aerial vehicles (UAV) is investigated in the present paper. No information is exchanged between aircrafts, only passive 2-D vision information is available to estimate the encountering traffic. The system is composed of three distinct components: intruder state estimation using Unscented...
This paper introduces a new LQ optimal, infinite horizon output tracking solution. It publishes results from problem formulation to real flight tests. After a short literature review, it rigorously derives the problem solution and states all of the properties of this new control method. Then it introduces the lateral-directional aircraft model on which the algorithm was tuned and tested. The LQ optimal...
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