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Abstract
The use of non-orthogonal, or conic, mounts for steerable antennas introduces some control system design problems not present in the more conventional orthogonal mounts. These problems result from both the geometrical and the mechanical cross-coupling which occurs between the two non-orthogonal axes of motion. This paper presents a general analysis and design of the control system for the open cassegrain antenna which can be readily applied to other non-orthogonal antenna structures. The form of the feedback controller for approximately non-interacting control of each axis is developed. Also described is a supplementary control strategy for providing tracking near the zenith region without excessively high slewing rates. A computer simulation o1 the system has verified the basic control strategy for non-orthogonal mounts and established the feasibility of operating compact antenna structures such as the open cassegrain design under severe wind conditions without a radome.
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