Boots – shoes – and leggings
Patent
1992-12-01
1995-02-14
Chin, Gary
Boots, shoes, and leggings
364459, 342357, 342358, 342457, G06F 1550
Patent
active
053901240
ABSTRACT:
The accuracy of a vehicle position estimate generated using a satellite-based navigation system is improved by accounting for non-linear errors in the vehicle position computations. The standard navigation equation is modified to include the error coefficients .alpha., .beta., .gamma. and .delta.. .alpha. is used to model errors in the x dimension. .beta. is used to model errors in the y dimension. .gamma. is used to model errors in the z dimension. .delta. is used to model errors in the pseudoranges. The error coefficients may be computed using an open-ended GPS system or a differential GPS system. The error coefficients may be computed in real time or may be computed once and used for a period thereafter. Once computed, the error coefficients are factored into the computation of a vehicle position estimate for increased precision.
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"Compensating for GPS Ephemeris Error", NASA Tech Briefs, Nov. 1992, pp. 56 and 58.
Caterpillar Inc.
Chin Gary
LandOfFree
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