Patent ID: 6351677
Filing Date: 2002-02-26
Classification: H03C,H03D,H03F,H04L

Abstract:
A method of compensating a phase rotation in a control loop of a Cartesian control system, the method comprising the steps of:receiving a first Cartesian signal pair, having signal values that originate from a first location in the control loop; receiving a second Cartesian signal pair, having signal values that originate from a second location in the control loop; differentiating the signal values of the first and second Cartesian signal pairs to generate a set of differentiated signal values; generating an estimate of a phase difference between the first Cartesian signal pair and the second Cartesian signal pair depending upon the differentiated signal values, the phase difference being indicative of a phase rotation in the control loop; generating a reference value that depends upon the phase difference estimate; and performing a rotation of phase in the control loop in accordance with the reference value so as to compensate for the phase rotation.