Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Patent
1998-07-22
2000-06-06
Tarcza, Thomas H.
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
342450, 342462, G01C 2100, G06G 778, G01S 302
Patent
active
060730773
ABSTRACT:
The invention is a method for determining gravity in an inertial navigation system which periodically produces and stores in memory position coordinates. The method comprises the steps of (a) retrieving the most recently determined position coordinates, (b) determining coordinates L.sub.u, L.sub.n, H.sub.u, and H.sub.n from the position coordinates, L.sub.u and L.sub.n being predetermined functions of geodetic latitude and H.sub.u and H.sub.n being predetermined functions of geodetic altitude, (c) determining the vertical component of gravity by substituting either or both L.sub.u and H.sub.u in a first polynomial expression, (d) determining the north-south component of gravity by substituting either or both L.sub.n and H.sub.n in a second polynomial expression, and (e) utilizing the components of gravity determined in steps (c) and (d) in the next determination of the position coordinates.
REFERENCES:
patent: 5957982 (1999-10-01), Hughes et al.
Litton Systems Inc.
Malm Robert E.
Mull Fred H
Tarcza Thomas H.
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