Optics: measuring and testing – Angle measuring or angular axial alignment – Star/sun/satellite position indication with photodetection
Reexamination Certificate
2005-03-22
2008-11-25
Tarcza, Thomas H (Department: 3662)
Optics: measuring and testing
Angle measuring or angular axial alignment
Star/sun/satellite position indication with photodetection
C356S003010, C356S139040, C342S118000
Reexamination Certificate
active
07456943
ABSTRACT:
The position of an apparatus moving along a surface is determined by calculating a plurality of vertical angles between the apparatus and a known location, where the vertical angles vary only within a range having a largest expected maximum angle. A plurality of horizontal distances between the apparatus and the known location are determined, each of the horizontal distances associated with one of the vertical angles. The horizontal distances are computed to within a tolerance based at least in part on the largest expected maximum angle. A plurality of heights of the apparatus are then determined using the plurality of vertical angles and associated horizontal distances. In particular embodiments, the known location may be associated with a rotating laser used with a photodetector at the target to determine the vertical angle. Further, the target may comprise a GPS receiver for use in determining the horizontal distance measurements.
REFERENCES:
patent: 6433866 (2002-08-01), Nichols
patent: 6450267 (2002-09-01), Ohtomo et al.
patent: 2004/0125365 (2004-07-01), Ohtomo et al.
Brabec Vernon Joseph
Goad Clyde C.
O'Connor Raymond M.
Brainard Timothy A
Tarcza Thomas H
Topcon Positioning Systems, Inc.
Weinick & Associates, LLC
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