Measuring and testing – Navigation – Take-off and landing monitors
Patent
1995-10-02
1997-07-01
Dougherty, Elizabeth L.
Measuring and testing
Navigation
Take-off and landing monitors
73180, G01C 2100
Patent
active
056440782
ABSTRACT:
An orientation monitoring apparatus includes an inner spherical shell rigidly fixed within an outer spherical shell, and a spherical ball positioned between the two shells. The inner shell has a polar coordinate grid impressed on it so that the position of the ball relative to the grid is seen from above. An inertial platform is rotationally interfaced with the inner shell. This platform supports a video camera with a view of the grid and ball. As well, the platform supports a motor driven fly-wheel which keeps the platform in a desired horizontal attitude. The motor, camera and a computer are driven by a solar cell and storage battery also mounted onto the platform and which receives energy through the transparent shells. An optical recognition software driven by the computer, is used to automatically compute the movements of the ball relative to the grid so that rotational movements of the shells can be computed in three-space.
REFERENCES:
patent: 3625083 (1971-12-01), Bose
patent: 4939508 (1990-07-01), Lawrence et al.
patent: 5168221 (1992-12-01), Houston
patent: 5371589 (1994-12-01), Martin
patent: 5371591 (1994-12-01), Martin et al.
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