Global positioning system having postprocessed realtime correcte

Details Global positioning system having postprocessed realtime correcte Global positioning system having postprocessed realtime correcte

1997-09-23

1999-10-26

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

H04B 7185

Patent

active

059736399

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: 5523763 (1996-06-01), Loomis
patent: 5680140 (1997-10-01), Loomis
patent: 5764184 (1998-06-01), Hatch et al.

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