Vehicle navigator

Details Vehicle navigator Vehicle navigator

1997-06-12

1999-01-05

Blum, Theodore M.

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

Directive

Including a satellite

701214, H04B 7185, G01S 502

Patent

active

058568026

ABSTRACT:
A vehicle navigator for calculating a running distance of a vehicle from output data of an acceleration sensor, an increase of accumulated errors during the calculation of the vehicle running distance being suppressed. The vehicle navigator has an acceleration sensor for detecting an acceleration of the vehicle; a velocity calculator for calculating a first velocity of the vehicle on the basis of an acceleration detected by the acceleration sensor; a GPS receiver for receiving radio waves from artificial satellites and obtaining a second velocity; a velocity correcting unit for correcting the first velocity by using the second velocity; a running distance calculator for calculating the running distance of the vehicle from the velocity corrected by the velocity correcting unit; and a velocity limiter for setting a velocity limit value range relative to the first velocity if the second velocity cannot be obtained from the GPS receiver, in order to control the first velocity so that it does not exceed the velocity limit value range.

REFERENCES:
patent: 5416712 (1995-05-01), Geier et al.

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