Navigation equipment which determines current position dependent

Details Navigation equipment which determines current position dependent Navigation equipment which determines current position dependent

1993-09-16

1995-06-06

Swarthout, Brent

Communications: electrical

Vehicle position indication

340995, 364443, 364449, G08G 1123

Patent

active

054226392

ABSTRACT:
In a case where a flag delivered from a self-contained navigation processor indicates that a position measured by the self-contained navigation processor lies on or in the vicinity of a road contained in road map information, a position correction processor selects and delivers the measured position of the self-contained navigation processor as an output current position. In any other case, the position correction processor calculates the distance between a position measured by a radio navigation processor and the position measured by the self-contained navigation processor. On condition that the distance between the coordinates of the two positions has, at least, a predetermined value, the position correction processor decides the measured position of the radio navigation processor as a current position, and it corrects to the current position a drive starting coordinate point which is managed by the self-contained navigation processor.

REFERENCES:
patent: 4713767 (1987-12-01), Sato et al.
patent: 4774672 (1988-09-01), Tsunoda et al.
patent: 4989151 (1991-01-01), Nuimura
patent: 5179519 (1993-01-01), Adachi et al.
patent: 5220509 (1993-06-01), Takemura et al.
patent: 5283575 (1994-02-01), Kao et al.
patent: 5293318 (1994-03-01), Fukushima

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