Boots – shoes – and leggings
Patent
1986-08-25
1988-12-13
Lall, Parshotam S.
Boots, shoes, and leggings
364450, 33356, G01C 1700
Patent
active
047915749
ABSTRACT:
In a navigation device for land vehicles the orientation signal which indicates the direction of movement along which the vehicle is moving is measured on the one hand by an electronic compass. A further orientation signal is produced by the variation of the vehicle orientation as determined by wheel sensors. These two orientation signals comprise measuring errors. In order to determine an optimum value for the orientation from said values a digital filter unit is used which comprises low-pass and high-pass filters. The value for the orientation signal measured by the compass is presented to the input of the low-pass filter and the further orientation signal is presented to an input of the high-pass filter. The filter unit further comprises a control unit which generates a filter parameter from received orientation signals and supplies said filter parameter to the low-pass filter and the high-pass filter.
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patent: 4429469 (1984-02-01), Tsushima et al.
patent: 4546550 (1985-10-01), Marchent et al.
patent: 4672565 (1987-06-01), Kumo et al.
Krukkert Henricus P. M.
Thoone Martinus L. G.
Black Thomas G.
Franzblau Bernard
Lall Parshotam S.
U.S. Philips Corporation
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