Vehicular traveling direction measuring system
First Claim
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1. A system for measuring a traveling direction of a vehicle, comprising:
- first means for deriving a first variation representing a change in a traveling direction of the vehicle based on an output from a gyro sensor;
second means for deriving a first vehicle traveling direction based on said first variation;
third means for deriving a second vehicle traveling direction based on an output from a geomagnetic sensor, said geomagnetic sensor deriving said output based on a geomagnetic field around the vehicle;
fourth means for deriving a second variation representing a change in said second vehicle traveling direction;
fifth means for deriving a first index, said first index indicative of a difference between said first and second variations to represent a disturbance of the geomagnetic field on a short distance basis;
sixth means for deriving a second index, said second index indicative of a difference between said first and second vehicle traveling directions to represent a disturbance of the geomagnetic field on a long distance basis; and
seventh means for calculating a third vehicle traveling direction based on said first and second directions, said seventh means changing a rate of dependence upon said first and second directions based on values of said first and second indicies to derive said third vehicle traveling direction.
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Abstract
A system for measuring a traveling direction of a vehicle includes a geomagnetic sensor and a gyro sensor. The system utilizes first and second indices for deriving the vehicle traveling direction. The first index is indicative of a disturbance of the geomagnetic field on a short distance basis, and the second index is indicative of a disturbance of the geomagnetic field on a long distance basis. The system varies a rate of dependence upon the geomagnetic sensor and the gyro sensor based on values of the first and second indices when calculating the vehicle traveling direction.
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Citations
12 Claims
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1. A system for measuring a traveling direction of a vehicle, comprising:
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first means for deriving a first variation representing a change in a traveling direction of the vehicle based on an output from a gyro sensor; second means for deriving a first vehicle traveling direction based on said first variation; third means for deriving a second vehicle traveling direction based on an output from a geomagnetic sensor, said geomagnetic sensor deriving said output based on a geomagnetic field around the vehicle; fourth means for deriving a second variation representing a change in said second vehicle traveling direction; fifth means for deriving a first index, said first index indicative of a difference between said first and second variations to represent a disturbance of the geomagnetic field on a short distance basis; sixth means for deriving a second index, said second index indicative of a difference between said first and second vehicle traveling directions to represent a disturbance of the geomagnetic field on a long distance basis; and seventh means for calculating a third vehicle traveling direction based on said first and second directions, said seventh means changing a rate of dependence upon said first and second directions based on values of said first and second indicies to derive said third vehicle traveling direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for measuring a traveling direction of a vehicle, comprising:
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first means for deriving a first vehicle traveling direction based on an output from a gyro sensor second means for deriving a second vehicle traveling direction based on an output from a geomagnetic sensor, said geomagnetic sensor deriving said output based on a geomagnetic field around the vehicle third means for deriving a first index, said first index indicative of a disturbance of the geomagnetic field on a short distance basis fourth means for deriving a second index, said second index indicative of a disturbance of the geomagnetic field on a long distance basis fifth means for calculating a third vehicle traveling direction based on said first and second directions, said fifth means changing a rate of dependence upon said first and second directions based on values of said first and second indicies to derive said third vehicle traveling direction. - View Dependent Claims (12)
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Specification