Patent ID: 6081228
Filing Date: 2000-06-27
Classification: G01S,H04B

Abstract:
A radio receiver including: a plurality of receiving channels, and a common clock source having an inherent phase noise, each receiving channel having at least one section adapted to track the carrier phase portion of a signal broadcast from one of a plurality of source transmitters, wherein each receiving channel section adapted to track carrier phase obtains timing signals from the common clock source, the receiver further comprising:a tracking filter for estimating the phase noise of the common clock source;said tracking filter receiving measurements from the plurality of receiving channels that are actively tracking the carrier phase of the source transmitters' signals;said filter deriving from said measurements from the plurality of receiving channels an estimate of the phase noise of said common clock source; andsaid receiver utilizing the estimate of the noise of the common clock source back in the sections of the receiver channels adapted to track the carrier phase to reduce common clock phase noise from each channels' measurement of carrier phase.