Discrete polar motion equations

Abstract

Summary. A digital filter equation is derived which is appropriate for predicting polar motion from excitation axis displacements, or for inferring the excitation axis changes from observed polar motion. The result differs from previously published equations in its phase response. Two additional equations are presented which are useful if samples of the excitation and polar motion functions are required to be at the same time values. Copyright © 1985, Wiley Blackwell. All rights reserved