Application of sampled data, on board model-following, control, and estimation techniques to attitude control of high performance, maneuvering spacecraft is described. Model-following control comprises three simultaneous modes: target generation and control, disturbance accommodation control, and regulator control. The actuator is a reaction wheel. Estimation is carried out by two separate Kalman filters. One filter processes measurements from a rate-integrating gyro; output is an estimate of a three-dimensional spacecraft state vector. A second filter processes a-periodic measurements from a strapdown star sensor; output is an estimate of a three-dimensional gyro-parameter state vector. Estimation and control algorithms tests in closed-loop software simulations show very satisfactory performance. The algorithms were implemented in a 16 bit digital computer on board IRAS. In-flight estimation and control experiments produce very good results.


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