Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1995-03-10
1996-12-24
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
H04B 7185
Patent
active
055877141
ABSTRACT:
A system and method employ a sensing of the attitude or orientation of a spacecraft for correcting the orientation of a line of sight of an instrument carried by a spacecraft to compensate for a transient perturbation in the attitude of the spacecraft. The instrument may be a microwave antenna for communicating with a station on the earth, or a camera for viewing the earth. The transient perturbation in the orientation, such as may be caused by the firing of a thruster of the spacecraft, is extracted from a measurement of the spacecraft orientation, such as the orientation relative to the earth. The line of sight of the instrument is reoriented by injection of an incremental orientation equal and opposite to the transient perturbation. The application of the incremental orientation can be accomplished in mechanical fashion, in the case of an antenna mechanically mounted to the spacecraft, and electrically, as in the case of a phased array antenna carried by the spacecraft.
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Chu Peter Y.
Tadros Alfred H.
Blum Theodore M.
Space Systems Loral, Inc.
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