Study on high accuracy large satellite antenna surface

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In this study, two novel methods for controlling the shape of a reconfigurable antenna reflector are developed. In these control methods, an antenna surface is deformed intentionally by using the surface adjustment mechanisms. In the one method, the changes in the gains caused by the intentional deformations are measured and in the other method changes in the surface accuracy of the measured surface shape are analyzed using an optical shape measurement system. Then, the control inputs for the shape correction of the deformed reflector are directly determined from the information about the changes in the antenna gains or the surface accuracy. Some numerical simulations and experiments are carried out to investigate the feasibility of these methods. Their results show that the antenna deformations are estimated and corrected adequately by using these methods.