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Douglas W Friedrich
Researcher at Caterpillar Inc.
Publications - 16
Citations - 1213
Douglas W Friedrich is an academic researcher from Caterpillar Inc.. The author has contributed to research in topics: Position (vector) & Global Positioning System. The author has an hindex of 7, co-authored 16 publications receiving 1213 citations.
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Patent
Vehicle position determination system and method
James W. Sennott,Christos T Kyrtsos,Adam J. Gudat,Dana A. Christensen,Douglas W Friedrich,Darrell E. Stafford +5 more
TL;DR: In this article, the first and second position estimates are combined and filtered using novel techniques to derive a more accurate third position estimate of the vehicle's position, which can be used for autonomous navigation.
Patent
Integrated vehicle positioning and navigation system, apparatus and method
Walter J. Bradbury,Dana A. Christensen,Richard G. Clow,Lonnie J. Devier,Douglas W Friedrich,Adam J. Gudat,Carl A. Kemner,Karl W. Kleimenhagen,Craig L. Koehrsen,Christos T Kyrtsos,Norman K Lay,Joel L. Peterson,Prithvi N. Rao,Larry E. Schmidt,James W. Sennott,Garry K. Shaffer,Wenfan Shi,Dong Hun Shin,Sanjiv Singh,Darrell E. Stafford,Louis J. Weinbeck,Jay H. West,William Whittaker,Baoxin Wu +23 more
TL;DR: In this article, a first position estimate (112) of the vehicle (102,310) is derived from satellites (132-170,200-206) of a global positioning system (100A) and/or a pseudolite(s) (105).
Patent
Method and apparatus for determining vehicle position using a satellite based navigation system
TL;DR: In this paper, an apparatus and method for determining the position of a vehicle relative to the center of the Earth using navigation signals from a satellite-based navigation system which includes a plurality of satellites orbiting the Earth is presented.
Patent
System and method for providing accurate vehicle positioning using spatial bias techniques
Christos T Kyrtsos,Adam J. Gudat,Dana A. Christensen,Douglas W Friedrich,Darrell E. Stafford +4 more
TL;DR: In this article, a vehicle position determination system and method provide accurate vehicle positioning using a global positioning system using Spatial bias techniques are used to improve positioning accuracy while the vehicle is in the midst of a relatively linear path and is not approaching a drastically nonlinear path.
Patent
System and method for using parabolic models to improve position estimates from a global positioning system
Christos T Kyrtsos,James W. Sennott,Adam J. Gudat,Dana A. Christensen,Douglas W Friedrich,Darrell E. Stafford +5 more
TL;DR: In this paper, the first and second position estimates are combined and filtered using novel techniques to derive a more accurate third position estimate of the vehicle's position, which can be used for autonomous navigation.