Vehicle navigator for calculating distance based on mean acceleration
First Claim
1. A vehicle navigator for calculating a running distance of a vehicle by measuring an acceleration of the vehicle, comprisingacceleration measuring means for measuring the acceleration of the vehicle;
- storage means for storing a plurality of output data sets output from said acceleration measuring means;
mean acceleration calculation means for calculating a mean value of output data sets stored in said storage means; and
running distance calculation means for calculating a running distance of the vehicle on the basis of the acceleration measured by said acceleration measuring means and the mean acceleration calculated by said mean acceleration calculation means.
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Abstract
In a vehicle navigator using an acceleration sensor for detecting a running distance, the precision of measuring the running distance is intended to be improved. Output data of the acceleration sensor during a predetermined time duration is stored in an output storage, and the average value or "mean acceleration" of output data is calculated by a mean acceleration calculator A running distance calculator calculates a difference between the acceleration measured with the acceleration sensor and the mean acceleration calculated by the mean acceleration calculator, and this difference is double integrated to obtain the running distance.
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Citations
18 Claims
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1. A vehicle navigator for calculating a running distance of a vehicle by measuring an acceleration of the vehicle, comprising
acceleration measuring means for measuring the acceleration of the vehicle; -
storage means for storing a plurality of output data sets output from said acceleration measuring means; mean acceleration calculation means for calculating a mean value of output data sets stored in said storage means; and running distance calculation means for calculating a running distance of the vehicle on the basis of the acceleration measured by said acceleration measuring means and the mean acceleration calculated by said mean acceleration calculation means. - View Dependent Claims (3, 5, 7, 9, 10, 13, 14, 15)
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2. A vehicle navigator for calculating a running distance and a position of a vehicle by measuring an acceleration of the vehicles comprising:
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acceleration measuring means for measuring the acceleration of the vehicle; storage means for storing a plurality of output data sets output from said acceleration measuring means; mean acceleration calculation means for calculating a mean value of output data sets stored in said storage means; running distance calculation means for calculating a running distance of the vehicle on the basis of the acceleration measured by said acceleration measuring means and the mean acceleration calculated by said mean acceleration calculation means; angular velocity measuring means for measuring an angular velocity of the vehicle; running azimuth calculation means for calculating a running azimuth of the vehicle on the basis of the angular velocity measured by said angular velocity measuring means; and position calculation means for calculating a position of the vehicle on the basis of the calculation results by said running distance calculation means and said running azimuth calculation means. - View Dependent Claims (4, 6, 8, 11, 12, 16, 17, 18)
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Specification