Patent ID: 6693979
Filing Date: 2004-02-17
Classification: G01S,H04L

Abstract:
A system for providing a final smoothed phase estimate of a phase between an input and a reference, the input having a dynamic phase process and a time varying amplitude, the system comprising,a phase lock loop for receiving the input, for generating the reference, for generating an inphase prediction error of the phase between the input and the reference, for generating a filtered state estimate for adjusting the reference, for adjusting the filtered state estimate in response to the time varying amplitude, and for adjusting the reference to reduce the inphase prediction error in the presence of the time varying amplitude and the dynamic phase process, an amplitude estimator for receiving the reference, for receiving the inphase prediction error, for receiving the input, for generating a quadrature prediction error of the phase between the input and the reference, for generating a time varying amplitude estimate from the inphase prediction error and quadrature predictor error, and for generating a final amplitude estimate from the time varying amplitude estimate, and a fixed delay smoother for receiving inphase prediction error, for generating the final smoothed phase estimate from the filtered state estimate and from the final amplitude estimate, the final smoothed phase estimate being delayed from the input by a fixed delay.