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Influence of thermal distortion of booms on attitude of gravity stabilized satellites.
Method for predicting attitude of passive gravity stabilized satellite.
The paper discusses the stabilization system analysis and orbital performance of the GEOS-A gravity-gradient satellite which was launched into orbit on 6 November 1965. The analysis is performed with the aid of a rather general digital simulation of the non-linear differential equations of motion. It includes the effects of gravity-gradient forces, orbital eccentricity, eddy current dampers, residual magnetic dipoles, solar radiation pressure, and thermal distortion of the spacecraft's stabilization boom. The attitude measuring system aboard the spacecraft is described, and processing of the attitude data is discussed. Description of failures in the attitude determination system and discussion of the subsequent effects on the experimental attitude results are included. Experimental attitude results are compared with the results of the digital simulation. General agreement is obtained. (Author).