Boots – shoes – and leggings
Patent
1991-07-05
1993-11-23
Black, Thomas G.
Boots, shoes, and leggings
364443, 342450, G06F 1550
Patent
active
052650251
ABSTRACT:
The navigation system using GPS signals from satellites first checks whether or not there are four or more satellites in radio range of the moving body. If so, the position calculation section performs an ordinary three-dimensional positioning operation to provide an accurate fix of the moving body. When the number of satellites within the radio range is three or less, the two-dimensional positioning operation is carried out, which comprises reading the previous altitude data from the altitude storage section; calculating the atmospheric pressure deviation from the atmospheric pressure sensor output as caused by the movement of the body; calculating the altitude deviation from the previous altitude data and the atmospheric pressure deviation; calculating the current altitude from the altitude deviation and the previous altitude data; and then calculating the two-dimensional position data from the GPS signals and the current altitude data. This method produces no errors which would otherwise be caused by changes in the altitude of the moving body but provides accurate two-dimensional fix data of the body.
REFERENCES:
patent: 4359733 (1982-11-01), O'Neill
patent: 4899285 (1990-02-01), Nakayama et al.
patent: 4903212 (1990-02-01), Yokouchi et al.
patent: 4954959 (1990-09-01), Moroto et al.
patent: 5075693 (1991-12-01), McMillan et al.
patent: 5111400 (1992-05-01), Yoder
patent: 5117363 (1992-05-01), Akiyama et al.
"NAVSTAR: Global Positioning System--Ten Years Later" IEEE, vol. 71, No. 10, Oct. 1983.
Black Thomas G.
Mitsubishi Denki & Kabushiki Kaisha
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