Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1999-06-07
2000-04-11
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
701215, H04B 7185, G01S 502
Patent
active
060493038
ABSTRACT:
A method for determining an improved position fix by performing postprocessing on a realtime differentially corrected GPS position. A remote rover unit containing a GPS receiver is used to determine a differentially corrected position according to measured pseudoranges and realtime pseudorange correction vectors is broadcast by a base station. The rover unit applies realtime corrections to measurements to determine a more accurate realtime differential position. It then stores the realtime differential position and the realtime pseudorange correction vector. Subsequently, postprocessing is performed to determine a postprocessed pseudorange correction vector. A difference vector representing the difference between the realtime pseudorange correction vector and the postprocessed pseudorange correction vector is then determined. This difference vector is applied to the realtime differential position to calculate a more accurate, improved position fix. This same process can be applied to determine velocities as well.
REFERENCES:
patent: 5528248 (1996-06-01), Steiner et al.
Biacs Zoltan
Farmer Dominic
Blum Theodore M.
Trimble Navigation Limited
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