Attitude determination is of major importance in Guidance and Control Systems of the Unmanned Aerial Vehicles (lIAVαs). Supplying wrong or imprecise attitude can very often be catastrophic for the UAVαs. Vision sensors are nowadays essential as they provide a rich source of information given as relative measurements between the vehicle navigation parameters (position, velocity and attitude) and the environment. This paper presents a framework for attitude determination from single camera vector observations. We assume a known environment in a form of a map and true vehicle positions from which each observation has been taken. Two different methods for attitude determination are presented: an iterative numerical solution based on Gauss Newton's method and an exact method known as the Davenport q-method. Pros and cons ofthe both solutions are presented.Published in Intelligent Systems (IS), 2010 5th IEEE International Conference, 7-9 July 2010, 49 - 54. DOI: 10.1109/IS.2010.554833
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