Navigation system with accurate determination of angular velocit

Details Navigation system with accurate determination of angular velocit Navigation system with accurate determination of angular velocit

1992-06-09

1995-02-14

Teska, Kevin J.

Boots, shoes, and leggings

364443, G01C 1738

Patent

active

053901231

ABSTRACT:
A navigation system having two sensors and two circuits. A travel sensor sends a pulse whenever a vehicle travels a predetermined distance. An angular velocity sensor outputs a voltage corresponding to an angular velocity of the vehicle. A correction circuit calculates the angular velocity from both a reference voltage that corresponds to an angular velocity of zero and an output voltage from the angular velocity sensor. A reference voltage resetting circuit monitors the pulse from the travel sensor; sets, as an effective sampling interval, at least a part of a interval from the end of a predetermined first cancellation interval after the pulse stops until the start of a second cancellation interval prior to a resumption of the pulse; calculates an average value of the output voltage of the angular velocity sensor, which has been periodically sampled during the effective sampling interval; and resets the reference voltage to the average value.

REFERENCES:
patent: 4558418 (1985-12-01), Kearns
patent: 5023799 (1991-06-01), Nakayama et al.
patent: 5172322 (1992-12-01), Takano et al.

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