Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1990-07-06
1992-02-11
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
342457, 364450, H04B 7185
Patent
active
050879197
ABSTRACT:
An on-board navigation apparatus having a GPS receiver detects a difference between the current and the previous values of the estimated current position in terms of the longitude and latitude information gained from GPS data. The difference is added to the coordinates of the previously established position, the result being taken for the coordinates of the estimated current position. This makes it possible to estimate the current position coordinates accurately even if the accuracy of GPS data is not high enough. When the GPS receiver is in a two-dimensional measuring state, the coordinates of the estimated current position are obtained from a manually or automatically designated elevation value and from the GPS data. This allows the current position coordinates to be estimated with accuracy even if the accuracy of GPS data has dropped due to the two-dimensional measuring instead of a three-dimensional measuring.
REFERENCES:
patent: 4849827 (1989-07-01), Hashimoto et al.
patent: 4903212 (1990-02-01), Yokouchi et al.
patent: 4949268 (1990-08-01), Nishikawa et al.
patent: 4954959 (1990-09-01), Moroto et al.
Akiyama Kazuhiro
Araki Morio
Fukushima Atsuhiko
Kashiwazaki Takashi
Odagawa Satoshi
Blum Theodore M.
Pioneer Electronic Corporation
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