Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1997-04-30
1999-09-07
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
701216, G01S 302
Patent
active
059493755
ABSTRACT:
A method of calculating a present position of a movable body for use in a navigation system, is provided with the processes of: measuring an electric-wave-based measurement position which is a position of the movable body measured on the basis of electric waves for positional measurement, which are transmitted from satellites accompanied by time data indicating an electric-wave-based measurement time which is a time when measuring the electric-wave-based measurement position, at the electric-wave-based measurement time; measuring a self-sustained measurement position which is a position of the movable body measured on the basis of data from self-sustained type sensors built in the movable body; calculating a time difference between the electric-wave-based measurement time and a time when measuring the self-sustained measurement position; correcting the electric-wave-based measurement position on the basis of the calculated time difference; and calculating the present position of the movable body on the basis of the corrected electric-wave-based measurement position and the self-sustained measurement position.
REFERENCES:
patent: 4903212 (1990-02-01), Yokouchi et al.
Wei-Wen Kao, "Integration of GPS and dead-reckoning navigation systems", pp. 635-643, Institute of Electrical and Electronics Engineers, vol. 2, Oct. 20, 1991.
Ishiguro Motoki
Kuwahara Shingo
Hellner Mark
Pioneer Electronic Corporation
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