초록 ▼

A method for use in a spacecraft for controlling yaw angle deviations from a desired yaw angle profile. The method includes the steps of: (a) operating a profile generator to output roll angle, pitch angle, yaw momentum, and yaw angle profiles, the profiles being calculated to meet spacecraft pointi

A method for use in a spacecraft for controlling yaw angle deviations from a desired yaw angle profile. The method includes the steps of: (a) operating a profile generator to output roll angle, pitch angle, yaw momentum, and yaw angle profiles, the profiles being calculated to meet spacecraft pointing requirements while operating in an inclined orbit; (b) inputting to an observer raw roll-axis sensor measurements, commanded and measured yaw-axis wheel momentum storage, measured pitch-axis wheel momentum storage, and external roll-axis and yaw-axis torques, the observer generating a yaw angle estimate and a yaw momentum estimate; (c) subtracting the yaw angle profile from the yaw angle estimate to obtain a difference value; and (d) using the difference value and the yaw momentum estimate to control roll-axis thruster firings to limit spacecraft yaw angle deviations from the yaw angle profile.

대표청구항 ▼

[ What is claimed is:] [1.] A method for use in a spacecraft for controlling yaw angle deviations from a desired yaw angle profile, comprising steps of: operating a profile generator to output desired roll angle, pitch angle, yaw momentum, and yaw angle profiles, the desired profiles being calculate

[ What is claimed is:] [1.] A method for use in a spacecraft for controlling yaw angle deviations from a desired yaw angle profile, comprising steps of: operating a profile generator to output desired roll angle, pitch angle, yaw momentum, and yaw angle profiles, the desired profiles being calculated to meet spacecraft pointing requirements while operating in an inclined orbit;inputting to an observer raw roll-axis sensor measurements, commanded and measured yaw-axis wheel momentum storage, measured pitch-axis wheel momentum storage, and external roll-axis and yaw-axis torques, the observer generating a yaw angle estimate and a yaw momentum estimate;subtracting the yaw angle profile from the yaw angle estimate to obtain a difference value; andusing the difference value and the yaw momentum estimate to control roll-axis thruster firings to limit spacecraft yaw angle deviations from the yaw angle profile.