Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2005-05-31
2005-05-31
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
06900758
ABSTRACT:
A server provides GPS aiding data to mobile GPS receivers are provided with an enclosed environment (e.g., within a large building) where the received GPS signal is likely to be weak or suffer multipath signal interference. The server receives GPS signals from one or more antennas within the enclosed environment and measures the multipath error in the vicinity of each antenna. Using the multipath error data for various satellite positions at various times, the server creates a delay model for the enclosed environment to generate GPS aiding data for the mobile GPS receivers. A generic delay model can be created that is applicable to similarly constructed buildings.
REFERENCES:
patent: 5815539 (1998-09-01), Lennen
patent: 5963582 (1999-10-01), Stansell, Jr.
patent: 6252546 (2001-06-01), Lennen et al.
patent: 6727846 (2004-04-01), Brown
Mann Wallace
Sahai Anant
MacPherson Kwok & Chen & Heid LLP
Phan Dao
SiRF Technology Inc.
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