Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Reexamination Certificate
2005-09-27
2005-09-27
Phan, Dao (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
C342S357490
Reexamination Certificate
active
06950059
ABSTRACT:
Disclosed are methods and apparatuses for determining the position of a roving receiver in a coordinate system using at least two base-station receivers, which are located at fixed and known positions within the coordinate system. The knowledge of the precise locations of the base-station receivers makes it possible to better account for one or all of carrier ambiguities, receiver time offsets, and atmospheric effects encountered by the rover receiver, and to thereby increase the accuracy of the estimated receiver position of the rover. Baselines are established between the rover and each base-station, and baselines are established between the base stations. Navigation equations, which have known quantities and unknown quantities, are established for each baseline. Unknowns for the baseline between base stations are estimated, and then used to correlate and reduce the number of unknowns associated with rover baselines, thereby improving accuracy of the rover's estimated position.
REFERENCES:
patent: 5786773 (1998-07-01), Murphy
patent: 5899957 (1999-05-01), Loomis
patent: 6181274 (2001-01-01), Pratt et al.
patent: 6374432 (2002-04-01), Morris
patent: 6397147 (2002-05-01), Whitehead
Rapoport Lev Borisovich
Zinoviev Alexei Eugenyevich
Phan Dao
Sheppard Mullin Richter & Hampton LLP
Topcon GPS LLC
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