초록 ▼

An agile steering control arrangement is provided for a spacecraft having a skewed scissor pair control moment gyro (SSP CMG) attitude control arrangement gimbaled with respect to the spacecraft body. The control arrangement includes a steering control process which converts arbitrary spacecraft bor

An agile steering control arrangement is provided for a spacecraft having a skewed scissor pair control moment gyro (SSP CMG) attitude control arrangement gimbaled with respect to the spacecraft body. The control arrangement includes a steering control process which converts arbitrary spacecraft boresight commands into spin torque and gimbal rate commands for a pair of spinning CMG. The steering control process generates suitable CMG torque commands based on requiring that the boresight nominally follow an arbitrary boresight trajectory described by required angular accelerations for the boresight together with one of various requirements on yaw motion. In this manner, a SSP CMG actuated spacecraft can be steered having tight boresight control while allowing a certain amount of error in yaw about the desired boresight. If spin motor capacities are exceed, new gimbal rates are determined based on saturation wheel spin torque.

대표청구항 ▼

1. A method of controlling a spacecraft attitude comprising:providing at least two torque generation devices by providing at least two single axis control moment gyros; orienting said torque generation devices so that their torque generation vectors are not collinear by orienting the two control mov

1. A method of controlling a spacecraft attitude comprising:providing at least two torque generation devices by providing at least two single axis control moment gyros; orienting said torque generation devices so that their torque generation vectors are not collinear by orienting the two control movement gyros as a skewed scissor pair; selecting a boresight direction fixed relative to the spacecraft body by selecting the boresight direction parallel with nominal wheel axes of the skewed scissors pair; measuring spacecraft attitude using spacecraft sensors and forming corresponding pitch, roll, and yaw signals about the boresight; accepting a trajectory command for boresight pitch and roll; generating torque commands based on the signals for pitch, roll and yaw about the boresight and the accepted trajectory command for boresight pitch and roll; and applying the generated torque commands through an actuator law to the at least two torque generation devices.