Vehicle navigation system using GPS including correction of coefficients for velocity sensor
First Claim
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1. A vehicle navigation system comprising:
- a first sensor for detecting a velocity of a vehicle;
a second sensor for detecting a direction of the vehicle;
estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors;
linear travel detecting means for detecting linear travel of the vehicle on the basis of a travel path of the vehicle obtained on the basis of a plurality of estimated positions;
means for obtaining positional data of the vehicle from an outside of the vehicle; and
sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between a distance between two positions of the vehicle obtained from the outside of the vehicle, and a linear travel distance from an estimated position calculating at the time when a first one of said two positions is obtained to another estimated position calculated at the time when a second position is obtained.
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Abstract
A vehicle navigation system automatically corrects the coefficient of its velocity sensor with high precision. This system obtains a distance between two positions measured by a GPS and a linear travel distance calculated on the basis of the signals outputted by the velocity sensor during a period between the measurement of the two positions. Then, the system corrects the velocity sensor coefficient so that the linear travel distance becomes equal to the distance between the two positions.
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Citations
9 Claims
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1. A vehicle navigation system comprising:
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a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; linear travel detecting means for detecting linear travel of the vehicle on the basis of a travel path of the vehicle obtained on the basis of a plurality of estimated positions; means for obtaining positional data of the vehicle from an outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between a distance between two positions of the vehicle obtained from the outside of the vehicle, and a linear travel distance from an estimated position calculating at the time when a first one of said two positions is obtained to another estimated position calculated at the time when a second position is obtained.
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2. A vehicle navigation system comprising:
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a first sensor for detecting a velocity of a vehicle; a second sensor for detecting a direction of the vehicle; estimated position calculating means for calculating an estimated position of the vehicle on the basis of outputs of said first and second sensors; means for obtaining positional data of the vehicle received from outside of the vehicle; and sensor coefficient calculating means for calculating a coefficient of said first sensor on the basis of a ratio between (i) a linear distance between two positions of the vehicle obtained by said means for obtaining positional data of the vehicle, and (ii) a linear distance from (a) a first estimated position calculated at the time when a first one of said two positions is obtained to (b) a second estimated position calculated at the time when a second one of said two positions is obtained. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9)
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Specification
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Current AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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Original AssigneeMatsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
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InventorsTsuji, Hiroaki, Suga, Yoichiro, Shibata, Akihito
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Primary Examiner(s)ZANELLI, MICHAEL J
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Application NumberUS08/530,586Time in Patent Office308 DaysField of Search364/450, 364/449, 364/457, 364/454, 364/571.01, 364/571.02, 340/988, 342/450, 342/451, 342/357, 342/457US Class Current701/221CPC Class CodesG01C 21/28 with correlation of data fr...
