Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1994-01-24
1996-09-17
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
343757, 342358, H01Q 300
Patent
active
055572855
ABSTRACT:
A multi-loop control system for a gimballed antenna that employs devices for measuring both absolute line-of-sight (an autotrack receiver or beacon tracker) and relative angular position (a resolver). The control system uses both signals simultaneously, thereby increasing the performance and pointing accuracy capability. Two control loops operate simultaneously to provide for optimum performance. The first loop is an inner high-bandwidth control loop that uses the relative gimbal angle measurement to control pointing of the antenna along a precommanded profile. The inner loop may run alone to provide for coarse pointing. When available, the line-of sight measurement is used in a low-bandwidth outer loop to provide corrections to the command profile of the inner loop. Control logic is provided that allows switching between several control modes. By using the present invention, antenna tracking control performance is maximized, especially in the presence of attitude disturbances of a spacecraft or significant flexible interactions.
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Anagnost John J.
Bender Douglas J.
Bockman Stuart F.
Eyerly Bruce N.
Denson-Low W. K.
Gudmestad Terje
Hughes Electronics
Issing Gregory C.
Leitereg Elizabeth E.
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