초록 ▼

A method in accordance with this invention for maintaining a spacecraft in a desired orbital configuration, comprises the steps of: (a) recording a history of yaw momentum stored in momentum wheels; (b) estimating an average inertial torque and momentum over a previous time interval (such as one day

A method in accordance with this invention for maintaining a spacecraft in a desired orbital configuration, comprises the steps of: (a) recording a history of yaw momentum stored in momentum wheels; (b) estimating an average inertial torque and momentum over a previous time interval (such as one day); (c) determining a desired change in inertial torques using PID control law; (d) commanding a change in satellite trim tab and solar array position from a desired change in solar torque; and (e) slewing the trim tab and solar array a desired amount.

대표청구항 ▼

[ What is claimed is:] [1.] A method for maintaining a spacecraft in a desired orbital configuration, said spacecraft being exposed to external torque disturbances, including solar torque disturbances, the method comprising the steps of:periodically sampling and recording a history of yaw momentum f

[ What is claimed is:] [1.] A method for maintaining a spacecraft in a desired orbital configuration, said spacecraft being exposed to external torque disturbances, including solar torque disturbances, the method comprising the steps of:periodically sampling and recording a history of yaw momentum from an output of momentum wheels;periodically estimating, from the recorded history, inertial disturbance torques and momentum expressed in a frame that is substantially inertial;determining a desired change in inertial torques from the estimated inertial disturbance torques and momentum;commanding a change in at least one of satellite trim tab and solar array angular position based on the desired change in inertial torques; andslewing the trim tab and the solar array so as to obtain the desired change in inertial torques to maintain roll and yaw momentum within predetermined limits.