Principal coordinate realization of state estimation and its application of order reduction

Abstract

Conclusions The clutter leakage metrics for the measurement of telescope image stability illustrated in this paper are quite valuable, particularly when the telescope undergoes the significant vibrations caused by an adjacent, deformable, articulated body such as a solar array or by control actuators such as reaction wheels or control-moment gyros. In these circumstances, since the Fourier spectrum of the telescope's pointing error is wide, the conventional method of measuring pointing accuracy in terms of stability and stability rates is inadequate. In the numerical example considered, the leakage metric is high for low damping of the solar array, which implies that greater damping yields a better image. Furthermore, the metric depends heavily upon the integration interval; below a certain limit, the smaller the interval, the better the image. The numerical illustration, therefore, also exemplifies controlstructure and payload-to-payload interaction.