Navigation apparatus

Details Navigation apparatus Navigation apparatus

2005-10-11

2008-10-28

Issing, Gregory C (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

Reexamination Certificate

active

07443338

ABSTRACT:
A navigation apparatus includes a GPS receiver, an error-circle-radius calculating subunit, and a vehicle-position calculating unit. The GPS receiver receives radio waves transmitted from a plurality of GPS satellites and produces a GPS position. The error-circle-radius calculating subunit detects elevation angles of the plurality of GPS satellites used for calculating the GPS position and a center-of-gravity position of the plurality of GPS satellites, and determines an error range around the GPS position on the basis of the detected elevation angles and the center-of-gravity position. The vehicle-position calculating unit calculates a current position using the GPS position obtained from the GPS receiver and the error range determined by the error-circle-radius calculating subunit.

REFERENCES:
patent: 5075693 (1991-12-01), McMillan et al.
patent: 5323163 (1994-06-01), Maki
patent: 5373298 (1994-12-01), Karouby
patent: 5483456 (1996-01-01), Kuwahara et al.
patent: 6377891 (2002-04-01), Gilbert
patent: 2005/0055160 (2005-03-01), King

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