Patent ID: 7737887
Filing Date: 2010-06-15
Classification: G01S

Abstract:
1. A method in a Global Navigation Satellite System (GNSS) receiver of correcting for drift, said method comprising: based on a first message received from a GNSS base station, nudging a broadcast orbit in use at said GNSS receiver to create a first nudged broadcast orbit for a GNSS satellite, said first nudged broadcast orbit being more precise than said broadcast orbit; receiving a second message from said GNSS base station; employing information included in said second message to determine a drift rate of said first nudged broadcast orbit relative to a more precise orbit in use at said GNSS base station; based upon said second message, nudging said broadcast orbit to create a second nudged broadcast orbit for said GNSS satellite; and correcting for a component of said drift rate relative to said second nudged broadcast orbit.