Patent ID: 6336076
Filing Date: 2002-01-01
Classification: G01S

Abstract:
A method of providing satellite data for a first global navigation satellite system (GNSS) satellite to a GNSS receiver, the method comprising:receiving at a pseudolite a first satellite global positioning signal transmitted by the first GNSS satellite, the first satellite global positioning signal containing the satellite data for the first GNSS satellite, wherein the satellite data for the first GNSS satellite includes ephemeris data for the first GNSS satellite; generating a pseudolite global positioning signal in a global positioning system (GPS) data message format including a plurality of frames of data, wherein some of the plurality of frames describe the ephemeris data for the pseudolite, wherein others of the plurality of frames describe the ephemeris data for the first GNSS satellite, and wherein the pseudolite global positioning signal is in a modified GPS satellite block II flexible data message structure; transmitting from the pseudolite the pseudolite global positioning signal, the pseudolite global positioning signal containing the satellite data for the first GNSS satellite; receiving at the GNSS receiver the pseudolite global positioning signal transmitted by the pseudolite; retrieving in the GNSS receiver the satellite data for the first GNSS satellite from the pseudolite global positioning signal; and wherein the ephemeris data for the first GNSS satellite which is contained in the pseudolite global positioning signal allows the GNSS receiver to directly acquire a Y-code in the first satellite global positioning signal.