Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1994-06-09
1996-06-04
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342357, 342457, 36442402, 364449, G01S 302, G01S 502, G06F 770, G01C 2100
Patent
active
055237657
ABSTRACT:
Accurate detection of an existing link (current road location between two road nodes) of a vehicle by an on-board navigation system. Upon each periodic detection of the position, azimuth and velocity of the vehicle by a GPS receiver, all the links within a predetermined distance of the vehicle position are extracted by looking up road data read out from a CD-ROM. For each of the links, the distance from the vehicle position, the angle with the vehicle azimuth, the angle between the vehicle azimuth and a passable direction of the link, the difference between the vehicle velocity and the speed limit for the link and the connectability with the last-detected existing link are obtained and are substituted into a predetermined existential probability evaluation function to calculate an existential probability. The link with the largest existential probability is determined to be the existing link. This existing link and guide route data in a guide route memory are collated to determine any deviation from the guided route. If a deviation has occurred, a warning character sequence pattern is generated and displayed on a map image on a screen.
REFERENCES:
patent: 4796191 (1989-01-01), Honey et al.
patent: 5311173 (1994-05-01), Komura et al.
patent: 5359529 (1994-10-01), Snider
patent: 5416712 (1995-05-01), Geier et al.
Alpine Electronics Inc.
Bever Patrick T.
Issing Gregory C.
Klivans Norman R.
Shoup Guy W.
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